JP7402464B2 - Wave analysis system - Google Patents

Description

The present invention relates to a wave analysis system that analyzes the traveling direction of waves.

Various techniques have been proposed for observing and analyzing waves generated on water. For example, the measurement method disclosed in Patent Document 1 measures the movement of a floating body installed on the water surface using GPS positioning, and determines the wave direction and the like. In addition, the sea conditioner disclosed in Patent Document 2 includes a wave transmitting/receiving unit that transmits ultrasonic pulses toward the sea surface, and receives sea surface echoes and backscattered waves of the ultrasonic pulses to detect temporal fluctuations in sea level and water particles. It includes a measurement unit that measures time-varying speed data, etc., and a calculation unit that calculates wave parameters such as wave height and wave direction using the measurement results of the measurement unit.

Patent No. 3726112 Patent No. 2948472

Here, although the inventions of Patent Documents 1 and 2 mentioned above can both analyze the direction of waves, the measurement method of Patent Document 1 requires a GPS receiver to be attached to the floating body, so the device configuration is It was a large-scale project, and the cost was high. In addition, the oceanographic meter of Patent Document 2 requires a wave transmitter/receiver unit installed on the seabed or under the sea, and such measurement equipment is expensive and requires work by divers to install and remove. There was also room for improvement.
The present invention has been made in view of the above problems, and its purpose is to analyze the traveling direction of waves with a simple device configuration.

(Aspects of the invention)
The following embodiments of the invention are intended to exemplify the configuration of the present invention, and will be explained separately in order to facilitate understanding of the various configurations of the present invention. Each section does not limit the technical scope of the present invention, and some of the constituent elements of each section may be replaced, deleted, or further modified while taking into consideration the best mode for carrying out the invention. Components to which the above components are added may also be included within the technical scope of the present invention.

(1) A system for analyzing the direction of movement of waves, which includes: a buoy installed on the water; at least one photographing means installed at a fixed position unaffected by waves for photographing an image of the buoy; analysis means for analyzing the traveling direction of waves generated around the buoy based on an image of the buoy photographed by at least one photographing means; From the photographed image of the buoy, the at least one photographing means detects an elliptical trajectory as a locus in which the buoy is influenced by waves and moves on a plane defined by a horizontal direction and a vertical direction in which waves advance. A wave analysis system that calculates the length of a portion corresponding to the major axis of the elliptical orbit when viewed from above, and analyzes the traveling direction of waves based on the calculation result.
The wave analysis system described in this section includes a buoy, at least one photographing means, and an analysis means, and the buoy is installed on the surface of any body of water that is subject to wave analysis. At least one photographing means is for photographing images such as videos or continuous still images of the buoy, and is installed at a fixed position that is not affected by waves in order to stably photograph images of the buoy. .

The analysis means acquires image data from the photographing means, and analyzes the traveling direction (wave direction) of waves generated around the buoy based on the acquired image of the buoy. For example, the analysis means analyzes the traveling direction of generated waves by measuring the movement of a buoy floating on the water surface from the acquired image data. More specifically, the analysis means analyzes the image of the buoy taken by the photographing means as a locus of movement of the buoy under the influence of waves on a plane defined by the horizontal direction and the vertical direction in which the waves advance. The length of the portion corresponding to the major axis of the elliptical orbit when viewed from the imaging means is calculated, and the traveling direction of the waves is analyzed based on the calculation result. In this way, the wave analysis system described in this section analyzes the traveling direction of waves, although it has a simple configuration that utilizes a buoy, at least one photographing means, and an analysis means. Therefore, compared to conventional wave observation and analysis devices, this device is extremely inexpensive to construct, and since it does not require the work of a diver, it is easy to install. Furthermore, the wave analysis results obtained by the analysis means are used for various purposes, such as monitoring of generated waves, and subsequent analysis and verification of waves.

(2) In the above item (1), the at least one photographing means includes one photographing means, and the analyzing means determines whether the buoy is affected by waves from an image of the buoy photographed by the one photographing means. the length of the major axis of the elliptical orbit as a locus moving on a plane defined by the horizontal direction and the vertical direction in which the waves travel, and the major axis when the elliptical orbit is viewed from the one imaging means. A wave analysis system (claim 1) that calculates the length of a portion corresponding to the major axis and analyzes the traveling direction of waves based on the ratio of the calculated length of the major axis to the length of the major axis equivalent portion.

The wave analysis system described in this section uses one photographing means as at least one photographing means, and the analysis means uses two images of the buoy regarding the movement of the buoy from the image of the buoy photographed by this one photographing means. Calculate the length of the two. Specifically, one of the lengths to be calculated is the trajectory of the buoy as it moves on a plane defined by the horizontal and vertical directions of the waves as it moves under the influence of waves. It is the length of the major axis of the elliptical orbit. Here, when viewed from the side perpendicular to the horizontal direction in which waves are traveling, water particles beneath the water surface where waves are occurring move in an elliptical orbit whose major axis is parallel to the horizontal direction in which waves are traveling. ing. Therefore, when affected by waves, the buoy moves following the movement of water particles below the water surface, and therefore moves in an elliptical orbit like the water particles. The analysis means calculates the length of the major axis of the elliptical orbit as the movement locus of such a buoy.

The other length calculated by the analysis means is the length of the portion corresponding to the major axis of the buoy when the elliptical orbit of the buoy as described above is viewed from the photographing means. In other words, the length of the major axis of the buoy's elliptical orbit described above is the length of the wave when viewed from the side perpendicular to the horizontal direction in which the waves travel (in other words, when the buoy's elliptical orbit is viewed from the front). This is the length in the direction parallel to the horizontal direction of travel. When the elliptical trajectory of this same buoy is viewed from a photographing means, the length of the portion corresponding to its major axis is, for reasons explained later, compared to when viewed from the side orthogonal to the horizontal direction in which the waves travel. become smaller or the same length. Therefore, the length of the portion corresponding to the major axis is calculated separately from the length of the major axis of the elliptical orbit of the buoy. The length of the portion corresponding to the major axis is the value obtained by multiplying the length of the major axis of the elliptical orbit by the sine of the angle formed by the direction from the photographing means toward the buoy in plan view and the direction of wave propagation. It can be approximated by

Furthermore, the analysis means analyzes the traveling direction of the waves based on the ratio of the two lengths calculated as described above. In other words, these two lengths are the length of the major axis when the elliptical orbit of the buoy is viewed from the same front direction, only when the direction from the photographing means to the buoy is perpendicular to the direction of wave propagation in plan view. Because they become each other, they become equal to each other. On the other hand, in other cases, the elliptical orbit of the buoy will be viewed from the front and from a different angle, so the length of the major axis when the elliptical orbit is viewed from the front is longer than the major axis when the elliptical orbit is viewed from an angle different from the front. The length of the corresponding portion is smaller. Furthermore, as the angle between the direction from the photographing means toward the buoy and the direction of wave propagation departs from 90 degrees in plan view, the ratio of the length of the portion corresponding to the major axis to the length of the major axis becomes smaller. Therefore, from the ratio of the length of the major axis to the length of the portion corresponding to the major axis, the angle formed between the direction from the photographing means to the buoy and the direction of wave propagation in plan view can be determined, and from this the direction of wave propagation can be calculated. It is something that In this way, even though only one imaging device is used, the direction of wave travel can be efficiently analyzed by using the ratio of the two lengths related to the movement of the buoy obtained from the image of that imaging device. It is something to do.

(3) In the above item (2), the analysis means calculates the height and period of waves obtained from the vertical movement of the buoy as seen from the one photographing means, and the preset installation position of the buoy. A wave analysis system ( Claim 2 ).
The wave analysis system described in this section is based on two factors: the length of the major axis of the elliptical orbit of the buoy mentioned in section (2) above, and the length of the portion corresponding to the major axis when the major axis is viewed from one imaging means. This defines the method for calculating length.

In other words, the analysis means calculates the length of the major axis of the buoy's elliptical orbit, the height and period of waves obtained from the vertical movement of the buoy as seen from one photographing means, and the preset installation position of the buoy. Calculated based on water depth. At this time, the height of the waves (wave height) is determined from the magnitude (displacement) of the vertical movement of the buoy, which is extracted from the photographic data of the buoy taken by one photographing means, and the period of the waves is: It is determined from the period of vertical movement of the buoy, which is also extracted from photographic data of the buoy. Then, from the wave height, the wave period, and the water depth at the buoy installation position, the length of the major axis of the elliptical orbit, which is the motion trajectory of the water particles under the water surface of the waves, is calculated. From the length of the major axis of the elliptical orbit, calculate the length of the major axis of the elliptical orbit of the buoy that moves under the influence of the movement of water particles.

On the other hand, the analysis means calculates the length of the portion corresponding to the major axis based on the horizontal displacement of the buoy as viewed from one photographing means, which is extracted from photographic data of the buoy photographed by one photographing means. That is, since the major axis of the elliptical trajectory as the movement locus of the buoy is parallel to the horizontal direction, the length of the major axis is equal to the displacement amount of the buoy in the horizontal direction. Since this relationship is the same when the buoy's elliptical orbit is viewed from one photographing means, the length of the portion parallel to the horizontal direction that corresponds to the major axis is equal to the horizontal direction of the buoy when viewed from one photographing means. It is determined from the displacement in the direction and is equal to the amount of displacement. In this way, the wave analysis system described in this section improves the efficiency and practicality of analysis by performing analysis using more specific calculation elements obtained from photographic data of buoys.

(4) In the above item (1), the at least one photographing means includes two photographing means, and the two photographing means are installed in a positional relationship such that they photograph the buoy from mutually different directions in plan view. , the analysis means determines, from an image of the buoy taken by one of the two photographing means, a horizontal direction and a vertical direction in which the waves advance when the buoy is influenced by waves. Calculating the length of a first major axis equivalent portion corresponding to the major axis of the elliptical orbit when the elliptical orbit as a locus moving on a plane is viewed from the one photographing means, and the two photographing means From an image of the buoy photographed by the other photographing means, calculate the length of a portion corresponding to a second major axis corresponding to the major axis when the elliptical orbit is viewed from the other photographing means; A wave analysis system (claim 3 ) that analyzes the traveling direction of waves based on the ratio of the length of the first major axis equivalent portion to the length of the second major axis equivalent portion.

The wave analysis system described in this section uses two photographing means as at least one photographing means, and the buoy is photographed simultaneously by these two photographing means. Furthermore, the two photographing means are installed in such a positional relationship that they photograph the buoy from different directions in plan view, and at this time, the two line segments connecting each of the two photographing means and the buoy in plan view. The angle is understood. The analysis means uses the images of the buoy taken by these two photographing means separately to calculate two lengths regarding the movement of the buoy. Specifically, one of the lengths to be calculated is the trajectory of the buoy as it moves on a plane defined by the horizontal and vertical directions of the waves as it moves under the influence of waves. This is the length of the first major axis corresponding to the major axis of the elliptical orbit when viewed from one imaging means.

In other words, as described in item (2) above, water particles beneath the water surface where waves are generated move in an elliptical orbit whose major axis is parallel to the horizontal direction in which the waves travel. , a buoy that moves following the movement of water particles moves in an elliptical orbit just like the water particles. When the elliptical orbit of such a buoy is viewed from one imaging means, the length of the first major axis corresponding to the major axis of the elliptical orbit is the length of the major axis when the buoy's elliptical orbit is viewed from the front. be less than or equal to . The analysis means determines the length of the portion corresponding to the first major axis from the image of the buoy taken by one of the photographing means. The other length calculated by the analysis means is the length of the second major axis corresponding to the major axis of the buoy when the elliptical orbit of the buoy as described above is viewed from the other photographing means. It is. That is, when the elliptical orbit of the buoy is viewed from the other imaging means, the length of the second major axis corresponding to the major axis of the elliptical orbit is equal to the length of the major axis when the elliptical orbit of the buoy is viewed from the front. or smaller. The analysis means determines the length of the portion corresponding to the second major axis from the image of the buoy taken by the other photographing means.

Furthermore, the analysis means analyzes the traveling direction of the waves based on the ratio of the two lengths calculated as described above. Here, since the two photographing means are in the above-mentioned positional relationship, the length of the first major axis corresponding portion and the second major axis corresponding portion are the same as those of one (or the other) photographing means in plan view. There is a correlation between the angle formed by the direction from the wave toward the buoy and the direction of wave travel. For example, although not limited thereto, a case will be described in which the angle between two line segments connecting each of the two photographing means and the buoy in plan view is about 90 degrees. In this case, when one photographing means is used as a reference, the length of the portion corresponding to the first major axis is the length of the major axis of the elliptical orbit of the buoy, the direction from one photographing means to the buoy in plan view, and the direction of wave propagation. It can be approximated by multiplying the sine (sin) of the angle formed by It can be approximated by the value multiplied by the cosine (cos) of the angle formed by the direction toward the buoy and the direction of travel of the wave.

Similarly, when the other photographing means is taken as a reference, the length of the portion corresponding to the first major axis is the length of the major axis of the elliptical orbit of the buoy, the direction from the other photographing means to the buoy in plan view, and the direction of wave propagation. It can be approximated by multiplying the cosine (cos) of the angle formed by It can be approximated by the value multiplied by the sine of the angle formed by the direction toward the buoy and the direction of travel of the wave. Note that even if the angle between the two line segments connecting each of the two photographing means and the buoy in plan view differs from 90 degrees, correction is made according to the angle difference, and the first and second What is necessary is to calculate the length of the portion corresponding to the major axis of 2. Therefore, from the ratio of the length of the first major axis equivalent portion to the second major axis equivalent portion, the direction from one (or the other) photographing means toward the buoy and the traveling direction of the wave in plan view. The angle is determined, and from this the traveling direction of the wave is calculated. In this way, the analysis accuracy is improved by using images obtained from two photographing means, and the direction of wave travel can be efficiently analyzed by using the ratio of two lengths that have a correlation. .

(5) In the above item (4), the analysis means calculates the length of the portion corresponding to the first major axis based on the horizontal displacement of the buoy as seen from the one photographing means, and A wave analysis system (claim 4 ) that calculates the length of the second major axis portion based on the horizontal displacement of the buoy as viewed from the other photographing means.
The wave analysis system described in this section stipulates a method for calculating two lengths: the length of the first major axis equivalent portion and the length of the second major axis equivalent portion mentioned in item (4) above. be. In other words, the analysis means extracts the length of the portion corresponding to the first major axis from the photographic data of the buoy taken by one of the two photographing means, and calculates the length of the buoy from the horizontal direction of the buoy as seen from one photographing means. Calculated based on directional displacement. That is, as described in the above item (3), since the major axis of the elliptical orbit of the buoy is parallel to the horizontal direction, the length of the major axis is equal to the displacement amount of the buoy in the horizontal direction. This relationship holds true even when the elliptical orbit of the buoy is viewed from one of the photographing means, so the length of the portion corresponding to the first major axis parallel to the horizontal direction is the length of the buoy when viewed from one photographing means. It is determined from the displacement in the horizontal direction and is equal to the amount of displacement.

Similarly, the analysis means extracts the length of the portion corresponding to the second major axis from the photographic data of the buoy photographed by the other photographing means of the two photographing means, and calculates the length of the buoy as seen from the other photographing means. Calculated based on horizontal displacement. In other words, as in the case of the first major axis equivalent portion, the length of the second major axis equivalent portion parallel to the horizontal direction is determined from the horizontal displacement of the buoy as seen from the other photographing means, and the amount of displacement is equal to In this way, the wave analysis system described in this section performs analysis mainly using the horizontal displacement of the buoy, which is obtained from photographic data of the buoy using two photographing methods, thereby increasing the efficiency and practicality of the analysis. It increases the degree of

(6) In items (1) to (5) above, the analysis means is a wave analysis system that analyzes at least one of the wave period, wave height, and time fluctuation of water level, in addition to the wave traveling direction. (Claim 5 ).
The wave analysis system described in this section uses an analysis means to analyze at least one of the wave period, wave height, and time fluctuation of water level, in addition to the wave traveling direction. As a result, more information will be provided as analysis results, and wave monitoring and wave wave verification using such analysis results will be performed more accurately.

(7) In paragraphs (1) to (6) above, the buoy is installed near a predetermined water area, and further, based on the analysis result of the analysis means, waves generated around the buoy are directed to the predetermined water area. A wave analysis system comprising monitoring means for monitoring the arrival of waves (claim 6 ).
The wave analysis system described in this section has a buoy installed on the water near a predetermined water area, and further includes a monitoring means for monitoring the arrival of waves to the predetermined water area. In other words, the monitoring means determines whether or not the waves generated around the buoy will reach a predetermined water area, and if so, from which direction, based on the analysis results including the direction of movement of the waves by the analysis means. Monitor things, etc. As a result, compared to conventional wave monitoring devices, more accurate wave attack information can be provided while reducing the cost of the device configuration and installation.

(8) In the above item (7), the wave analysis system (claim 7 ).
The wave analysis system described in this section uses monitoring means to monitor the arrival of waves to the construction area of floating construction.In this case, the construction area that needs to be installed at the time of construction of floating construction is used as a buoy to be photographed by the photographing means. It uses a buoy for display purposes. This eliminates the need to install a dedicated buoy for use with this system, which further reduces costs. Furthermore, the arrival of waves into the water construction area can be efficiently monitored, which in turn further increases the safety of construction workers.

Since the present invention has the above-described configuration, it is possible to analyze the traveling direction of waves with a simple device configuration.

1 shows a wave analysis system according to a first embodiment of the present invention, in which (a) is a perspective view showing an installation image, and (b) is a plan view showing an analysis image. FIG. 2 is an image plan view showing the definition of the traveling direction of waves in the wave analysis system according to the embodiment of the present invention. It is an image side view showing the relationship between waves and the movement of a buoy. FIG. 1 is a plan view for explaining a test method for a wave analysis system according to an embodiment of the present invention. It is a graph showing test results of the wave analysis system according to the first embodiment of the present invention. A wave analysis system according to a second embodiment of the present invention is shown, in which (a) is a perspective view showing an installation image, and (b) is a plan view showing an analysis image. It is a graph which shows the test result of the wave analysis system based on the 2nd Embodiment of this invention. It is a top view which shows the installation image of the wave analysis system based on the 3rd Embodiment of this invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described based on the accompanying drawings. Note that throughout the drawings, the same or corresponding parts are indicated by the same reference numerals.
FIG. 1 schematically shows a wave analysis system 10 according to a first embodiment of the present invention. As shown in FIG. 1(a), the wave analysis system 10 includes a buoy 12, a photographing means 14, and an analysis means 16. The buoy 12 is floated on the water at an arbitrary position where waves 30 are analyzed by the wave analysis system 10, and the photographing means 14 photographs the buoy as it moves on the water. As the buoy 12, a buoy of any shape and size can be used, such as a buoy used to indicate a work area, a light buoy, a spherical buoy, or the like.

The photographing means 14 is for photographing an image of the buoy 12, and is installed at a fixed position that is not affected by waves 30 and is located at a distance where the buoy 12 can be photographed. In this embodiment, the photographing means 14 is installed on the quay 20, but it may be installed on other structures on land, on top of existing caissons on the water, or the like. As the photographing means 14, a commercially available video camera capable of photographing a moving image or continuous still images of the buoy 12 can be used. In particular, a commercially available wearable camera has waterproof performance and the ability to capture image data into the analysis means 16. This is preferable from the viewpoint of ease of use. In FIG. 1(a) and FIG. 2, which will be described later, the photographing direction P of the photographing means 14 for photographing the buoy 12 (the direction from the photographing means 14 toward the buoy 12) is indicated by a broken line arrow, and the buoy An image of waves 30 generated around wave 12 is shown by a wavy arrow.

The analysis means 16 takes in the image data of the buoy 12 photographed by the photographing means 14, and analyzes the waves 30 based on this image data. It is constructed from a commercially available PC such as a computer or tablet type. Therefore, the analysis results of the analysis means 16 are displayed on the display of the PC constituting the analysis means 16. Further, the analysis means 16 is connected to the photographing means 14, and any wired connection or wireless connection capable of communicating image data, etc. is used as the connection method. The analysis means 16 of this embodiment is installed on the quay 20 like the photographing means 14, and is installed near the photographing means 14, but is installed at another fixed position that is not affected by the waves 30. Good too. The analysis means 16 is preset with information regarding the shape of the buoy 12 and the water depth at the position where the buoy 12 is installed, in order to identify the buoy 12 from the image data taken in from the photographing means 14. ing.

To specifically explain the content of the analysis by the analysis means 16, the analysis means 16 of this embodiment calculates at least the traveling direction T of the waves 30 generated around the buoy 12. Here, as shown in FIG. 2, the traveling direction T of the waves 30 in this embodiment is the photographing direction P of the photographing means 14 for photographing the buoy 12, and the traveling direction of the waves 30 (the traveling direction of the waves 30). In other words, it is defined as the angle θ at which the waves 30 are incident with respect to the photographing direction P of the photographing means 14. In order to calculate such an angle θ, the analysis means 16 calculates the length of the major axis 42 of the elliptical trajectory as the movement trajectory of the buoy 12 that moves under the influence of the waves 30, as shown in FIG. 1(b). and the length of a portion 44 corresponding to the major axis when the major axis 42 of the elliptical orbit is viewed from the photographing means 14. Although the waves 30 spread horizontally to some extent and move forward, in FIG. 1(b), FIG. 2, and FIG. It is schematically illustrated by a single two-dot chain arrow.

Here, FIG. 3 schematically shows the state of the water surface and the water when the waves 30 occur from a side direction perpendicular to the traveling direction T of the waves 30 passing through the position of the buoy 12. Referring to FIG. 3, below the water surface where waves 30 are generated, water particles are moving in an elliptical orbit 34 indicated by a thin broken line arrow. In other words, the water particles form an ellipse whose major axis is parallel to the horizontal direction as a locus that moves on a plane as shown in FIG. 3 defined by the horizontal direction T in which the waves 30 advance and the vertical direction. It is moving in a trajectory 34. The elliptical orbit 34 of the water particles tends to become smaller as the water depth increases, and here, the major axis of the elliptical orbit 34 of the water particles just below the water surface is indicated by reference numeral 36. Then, in order to calculate the length of the major axis 36 of the elliptical trajectory 34 of the water particles, the analysis means 16 first uses information regarding the shape of the buoy 12 from the image photographed by the photographing means 14. Then, the vertical movement of the buoy 12 is extracted.

Furthermore, the analysis means 16 determines the amount of displacement of the buoy 12 in the vertical direction and the period of movement of the buoy 12 in the vertical direction from the movement of the buoy 12 in the vertical direction. Here, the amount of displacement of the buoy 12 in the vertical direction under the influence of the waves 30 is considered to be equal or approximately equal to the height (wave height) of the waves 30, and the period of movement of the buoy 12 in the vertical direction is It is considered to be equal to the period of the wave 30 (the time the wave travels). Therefore, the analysis means 16 calculates the height and period of the waves 30 from the vertical displacement amount and movement period of the buoy 12. Next, the analysis means 16 uses a known theoretical formula to analyze water particles based on the height and period of the waves 30 and the water depth at the preset installation position of the buoy 12, although detailed explanation will be omitted. The length of the major axis 36 of the elliptical orbit 34 is calculated.

On the other hand, as shown in FIG. 3, the buoy 12 is influenced by the waves 30 and moves following the movement of water particles as described above, and is defined by the horizontal direction T in which the waves 30 advance and the vertical direction. The water particles move while drawing an elliptical orbit 40 (see thick broken line arrow) smaller than the elliptical orbit 34 of the water particle. The size of the elliptical orbit 40 of the buoy 12 is considered to vary depending on the shape and size of the buoy 12. Therefore, the analysis means 16 utilizes an appropriate coefficient set according to the shape and size of the buoy 12 in use and the length of the major axis 36 of the elliptical orbit 34 of the water particles. The length of the major axis 42 of the elliptical orbit 40 of the buoy 12, which is parallel to the horizontal direction as well as the major axis 36, is calculated. Note that it is preferable that the above-mentioned coefficients be determined through repeated experiments and the like so that the accuracy of the analysis results can be further improved.

On the other hand, the analysis means 16 calculates the length of the major axis equivalent portion 44 (see FIG. 1(b)) corresponding to the major axis 42 of the elliptical orbit 40 when the elliptical orbit 40 of the buoy 12 is viewed from the photographing means 14. In order to do this, first, the movement of the buoy 12 in the horizontal direction is extracted from the image photographed by the photographing means 14 using information regarding the shape of the buoy 12 and the like. Furthermore, the analysis means 16 determines the amount of horizontal displacement of the buoy 12 from the horizontal movement of the buoy 12. Here, when the elliptical orbit 40 is viewed from the photographing means 14, a portion 44 corresponding to the major axis is parallel to the horizontal direction, similar to the major axis 42 of the elliptical orbit 40. Therefore, the length of the major axis equivalent portion 44 is considered to be equal to the horizontal displacement amount of the buoy 12 as viewed from the photographing means 14, and the analysis means 16 calculates the major axis equivalent portion from the horizontal displacement amount of the buoy 12. Calculate the length of 44.

Furthermore, the analysis means 16 calculates the ratio based on the ratio of the length of the major axis 42 of the elliptical orbit 40 of the buoy 12 and the length of the major axis equivalent portion 44 when the major axis 42 is viewed from the photographing means 14. Then, the angle θ indicating the traveling direction T of the waves 30 is calculated. That is, as can be confirmed in FIG. 1B, the length of the major axis equivalent portion 44 can be approximately expressed by multiplying the length of the major axis 42 by sin θ, which is the sine of the angle θ. Therefore, the analysis means 16 uses this relationship to calculate the angle θ, and specifies the traveling direction T of the waves 30 as the incident angle θ of the waves 30 with respect to the photographing direction P of the photographing means 14. Note that, although a detailed explanation will be omitted, the analysis means 16 of this embodiment may analyze the period of the waves 30, the wave height, the time fluctuation of the water level, etc. in addition to the traveling direction T of the waves 30. The period and wave height of the waves 30 may be determined from the vertical movement of the buoy 12 in the same way as when calculating the length of the major axis 36 of the elliptical orbit 34 of the water particles. The same applies to the temporal fluctuations in the water level, and the temporal fluctuations in the water level may be calculated by measuring the movement of the buoy 12 in the vertical direction over a long period of time.

The wave analysis system 10 according to the first embodiment of the present invention as described above was tested in an environment as shown in FIG. 4. That is, the buoy 12 is installed in a harbor where natural waves 30 are unlikely to occur, and two photographing means 14A and 14B are installed on the quay 20 as the photographing means 14. Then, a small boat 50 is run on the offshore side of the buoy 12 as viewed from the two photographing means 14A and 14B, and the intentionally generated wake wave is likened to the wave 30, and the traveling direction T of the wave 30 is determined by the analysis means 16. Calculated. Although two photographing means 14A and 14B are installed, in the test of the wave analysis system 10 according to the first embodiment of the present invention, the photographing data of the two photographing means 14A and 14B are used separately. Then, the angle θ (θ ₁ , θ ₂ ) indicating the traveling direction T was calculated from each photographic data. Further, in FIG. 4, illustration of the analysis means 16 is omitted.

In FIG. 5, the vertical axis is the angle θ (θ_calculated value) calculated by the wave analysis system 10, and the horizontal axis is the angle θ (θ_true value) obtained by photographing from the sky with a drone. The test results are plotted with white circles, and the test results of the other photographing means 14B are plotted with black circles. Further, FIG. 5 shows the results for 12 waves 30 with relatively large wave heights among the waves (wake waves) 30 generated multiple times by the small boat 50. Therefore, the results for 12 times calculated using the photographing data of one photographing means 14A and the results for 12 times calculated using the photographing data of the other photographing means 14B, for a total of 24 results. is included in Figure 5. Further, in FIG. 5, a line where the θ_calculated value and the θ_true value match is shown as a thick line, and a line that is away from this line by ±45 degrees is shown as a thin line. When checking FIG. 5, it can be seen that the traveling direction T of the waves 30 can be determined with an accuracy of about 4 directions (range of 90 degrees), although it varies as the angle θ increases.

Now, according to the first embodiment of the present invention having the above configuration, it is possible to obtain the following effects. That is, the wave analysis system 10 according to the first embodiment of the present invention includes a buoy 12, one photographing means 14, and an analysis means 16, as shown in FIG. Installed above water in any target body of water. One photographing means 14 is for photographing images of the buoy 12 such as moving images or continuous still images. It is installed in a fixed position such as The analysis means 16 acquires image data from the photographing means 14, and analyzes the traveling direction T of waves 30 generated around the buoy 12 based on the acquired image of the buoy 12.

Specifically, the analysis means 16 analyzes the traveling direction T of the generated waves 30 by measuring the movement of the buoy 12 floating on the water surface from the acquired image data. As described above, the wave analysis system 10 according to the first embodiment of the present invention has a simple configuration that utilizes the buoy 12, the photographing means 14, and the analysis means 16, but is able to detect the traveling direction T of the waves 30. can be analyzed. Therefore, compared to the conventionally used equipment for observing and analyzing waves 30, it can be constructed at an extremely low cost, and installation can also be made easier since there is no need for work by divers. . Furthermore, the analysis results of the waves 30 by the analysis means 16 can be used for various purposes, such as monitoring of the waves 30 that occur, and subsequent analysis and verification of the waves 30.

Furthermore, the wave analysis system 10 according to the first embodiment of the present invention uses the analysis means 16 to calculate two lengths related to the movement of the buoy 12 from the image of the buoy 12 photographed by one photographing means 14. do. Specifically, as shown in FIG. 3, the length of one side to be calculated is defined by the horizontal direction T and the vertical direction in which the waves 30 travel when the buoy 12 is shaken under the influence of the waves 30. This is the length of the major axis 42 of the elliptical orbit 40 of the buoy 12 as a trajectory moving on a plane. Here, in the side view shown in FIG. 3, water particles under the water surface where waves 30 are generated move along an elliptical trajectory 34 whose major axis is a direction parallel to the horizontal direction T in which the waves 30 travel. ing. Therefore, when affected by the waves 30, the buoy 12 moves following the movement of water particles below the water surface, and thus moves in an elliptical orbit 40 like the water particles. The analysis means 16 calculates the length of the major axis 42 of the elliptical orbit 40 as the movement trajectory of the buoy 12.

The other length calculated by the analysis means 16 is the elliptical orbit of the buoy 12 when the elliptical orbit 40 of the buoy 12 as described above is viewed from the photographing means 14, as shown in FIG. 1(b). This is the length of a portion 44 corresponding to the major axis corresponding to the major axis 42 of 40. That is, the length of the major axis 42 of the elliptical orbit 40 of the buoy 12 described above is parallel to the horizontal direction T in which the waves 30 travel when the elliptical orbit 40 of the buoy 12 as shown in FIG. 3 is viewed from the front. This is the length in the direction. When the elliptical orbit 40 of this same buoy 12 is viewed from the photographing means 14, the length of the portion 44 corresponding to the major axis 42 is, for the reason described later, when the elliptical orbit 40 shown in FIG. 3 is viewed from the front. be smaller or the same length compared to. Therefore, the length of the major axis equivalent portion 44 is calculated separately from the length of the major axis 42 of the elliptical orbit 40 of the buoy 12.

Furthermore, the analysis means 16 analyzes the traveling direction T of the waves 30 based on the ratio of the two lengths calculated as described above. In other words, these two lengths are determined by the length of the buoy 12 only when the direction P from the photographing means 14 toward the buoy 12 and the traveling direction T of the waves 30 are perpendicular to each other in a plan view as shown in FIG. The lengths of the major axes 42 when the elliptical orbits 40 are viewed from the same front direction are the same, so they are equal to each other. On the other hand, in other cases, the elliptical orbit 40 of the buoy 12 is viewed from the front and from a different angle, so the length of the major axis 42 when the elliptical orbit 40 is viewed from the front is larger than the length of the elliptical orbit 40 from the front. The length of the major axis equivalent portion 44 when viewed from the angle is smaller. Moreover, as the angle θ formed by the direction P from the photographing means 14 toward the buoy 12 and the traveling direction T of the waves 30 in plan view departs from 90 degrees, the length of the major axis equivalent portion 44 with respect to the length of the major axis 42 increases. The ratio becomes smaller.

Such a relationship is established between the length of the major axis 42, the direction P from the photographing means 14 toward the buoy 12 in plan view, and the traveling direction T of the waves 30, as shown in FIGS. 1(b) and 2. The correlation is expressed in that the result of multiplying the angle θ by the sine (sin) is equal to the length of the major axis equivalent portion 44. Therefore, the angle θ representing the traveling direction T of the waves 30 can be determined from the ratio of the length of the major axis 42 and the length of the major axis equivalent portion 44. In this way, even though only one photographing means 14 is used, the traveling direction of the waves 30 can be determined by using the ratio of the two lengths regarding the movement of the buoy 12 obtained from the image of the photographing means 14. It becomes possible to analyze T efficiently.

Furthermore, the wave analysis system 10 according to the first embodiment of the present invention uses the analysis means 16 to determine the length of the major axis 42 of the elliptical orbit 40 of the buoy 12 in the vertical direction of the buoy 12 as viewed from the photographing means 14. It is calculated based on the height and period of the waves 30 determined from the motion and the water depth at the preset installation position of the buoy 12. At this time, the height of the waves 30 can be determined from the magnitude of the movement of the buoy 12 in the vertical direction, which is extracted from the photographic data of the buoy 12 photographed by the photographing means 14, and the period of the waves 30 is also It can be determined from the period of movement of the buoy 12 in the vertical direction, which is extracted from photographic data of the buoy 12. Then, from the height of these waves 30, the period of the waves 30, and the water depth at the installation position of the buoy 12, as shown in FIG. 36 is calculated, and further, from the length of the major axis 36 of the elliptical orbit 34 of the water particles, the length of the major axis 42 of the elliptical orbit 40 of the buoy 12 that moves under the influence of the movement of the water particles is calculated. do.

On the other hand, as shown in FIG. 1(b), the analysis means 16 calculates the length of the major axis equivalent portion 44 of the buoy as viewed from the photographing means 14, which is extracted from photographic data of the buoy 12 photographed by the photographing means 14. Calculated based on the horizontal displacement of 12. That is, since the major axis 42 of the elliptical trajectory 40 as the movement locus of the buoy 12 is parallel to the horizontal direction, the length of the major axis 42 is equal to the displacement amount of the buoy 12 in the horizontal direction. Since such a relationship is the same when the elliptical orbit 40 of the buoy 12 is viewed from the photographing means 14, the length of the portion 44 corresponding to the major axis parallel to the horizontal direction is the same as the length of the buoy 12 when viewed from the photographing means 14. It can be determined from the horizontal displacement of , and is equal to the amount of displacement. As described above, the wave analysis system 10 according to the first embodiment of the present invention improves the efficiency of analysis by performing analysis using more specific calculation elements obtained from photographic data of the buoy 12. It becomes possible to increase the practicality.

In addition, the wave analysis system 10 according to the first embodiment of the present invention uses the analysis means 16 to analyze not only the traveling direction T of the waves 30 but also the period, wave height, and time fluctuation of the water level of the waves 30. It is. This makes it possible to provide more information as analysis results, making it possible to monitor waves 30 using such analysis results and conduct post-event verification of waves 30 with greater precision. .

Next, a wave analysis system 10' according to a second embodiment of the present invention will be described with reference to FIGS. 6 and 7. In FIGS. 6 and 7, parts that are the same as or correspond to those of the wave analysis system 10 according to the first embodiment of the present invention are given the same reference numerals. Regarding the wave analysis system 10' according to the second embodiment of the present invention, only the differences from the wave analysis system 10 according to the first embodiment of the present invention will be explained. Descriptions of the configurations and the like of parts similar to those of the wave analysis system 10 according to the first embodiment will be omitted.

As shown in FIG. 6, the wave analysis system 10' according to the second embodiment of the present invention includes a buoy 12, two photographing means 14 (14A, 14B), and in the illustrated example, two analysis means 16. (16A, 16B). The two photographing means 14A and 14B are installed at a fixed position unaffected by the waves 30, in the example of FIG. 6, on the quay 20 so as to simultaneously photograph the buoy 12, and as shown in FIG. 6(b). The buoys 12 are installed in a positional relationship such that the buoys 12 are photographed from different directions in a plan view as shown. This positional relationship is defined by the angle α between the two line segments connecting each of the two photographing means 14A, 14B and the buoy 12 in plan view, and is not limited to this, but as shown in FIG. 6(b) In this example, the angle α is 90 degrees or as close to 90 degrees as possible. In FIG. 6(b), the photographing direction _P1 of one photographing means 14A for photographing the buoy 12 and the photographing direction _P2 of the other photographing means 14B for photographing the buoy 12 are indicated by broken line arrows. , the angle α is indicated using these photographing directions P ₁ and P ₂ .

The two analyzing means 16A, 16B are connected to the photographing means 14A such that one of the analyzing means 16A acquires an image from the one photographing means 14A, and the other analyzing means 16B is connected to the other photographing means 14B. It is connected to the photographing means 14B so as to acquire an image from the camera. For this reason, these analysis means 16A, 16B are installed on the quay 20 like the photographing means 14A, 14B, and the analysis means 16A is installed near the photographing means 14A, and the analysis means 16B is installed near the photographing means 14B. However, it may be installed at another fixed position that is not affected by the waves 30. Further, the two analysis means 16A, 16B are connected to each other by wire or wirelessly so as to be able to communicate with each other, so that they can share the image data acquired from the photographing means 14A, 14B, each other's analysis results, etc.

Here, in the wave analysis system 10' according to the second embodiment of the present invention, the number of analysis means 16 may be one. , and images are simultaneously acquired from both photographing means 14A and 14B. Hereinafter, the content of analysis by the analysis means 16 will be explained by taking as an example the case where there is only one analysis means 16. However, when using two analysis means 16A and 16B, each process necessary for analysis is The analysis may be performed separately by the two analysis means 16A, 16B, or by either one of the two analysis means 16A, 16B. That is, processes that can be executed individually by each of the analysis means 16A and 16B are executed individually, and processes that integrate the results of those processes and the like are executed by one of the analysis means 16A and 16B, while the other is executed separately. All you have to do is get the information from.

In the wave analysis system 10' according to the second embodiment of the present invention, the analysis means 16 operates in the traveling direction T of the waves 30, as in the case of the wave analysis system 10 according to the first embodiment of the present invention. The calculation method is different from that of the wave analysis system 10. Specifically, in order to calculate the angle θ, the analysis means 16 of the wave analysis system 10' calculates the elliptical trajectory 40 (see FIG. 3) as the movement trajectory of the buoy 12 that moves under the influence of the waves 30. The length of the first major axis equivalent portion 44A corresponding to the major axis 42 of the elliptical orbit 40 when viewed from the other photographing means 14A, and the length of the elliptical orbit 40 when the same elliptical orbit 40 is viewed from the other photographing means 14B. The length of the second major axis equivalent portion 44B corresponding to the major axis 42 is calculated.

The length of the first major axis equivalent portion 44A and the second major axis equivalent portion 44B are determined by the method used to calculate the length of the major axis equivalent portion 44 in the description of the wave analysis system 10 according to the first embodiment. Calculate using the same method as . That is, the analysis means 16 determines the amount of displacement of the buoy 12 in the horizontal direction as seen from the one photographing means 14A from the image of the buoy 12 photographed by the one photographing means 14A. When the elliptical orbit 40 is viewed from one photographing means 14A, the first major axis corresponding portion 44A is parallel to the horizontal direction, and the length of the first major axis corresponding portion 44A is from one photographing means 14A to Since it is considered to be equal to the horizontal displacement amount of the buoy 12 as seen, the length of the first major axis equivalent portion 44A is calculated from the horizontal displacement amount of the buoy 12. Similarly, the analysis means 16 determines the horizontal displacement amount of the buoy 12 as viewed from the other photographing means 14B from the image of the buoy 12 photographed by the other photographing means 14B. When the elliptical orbit 40 is viewed from the other photographing means 14B, the second major axis equivalent portion 44B is parallel to the horizontal direction, and the length of the second major axis equivalent portion 44B is Since it is considered to be equal to the horizontal displacement amount of the buoy 12 as seen, the length of the second major axis equivalent portion 44B is calculated from the horizontal displacement amount of the buoy 12.

Furthermore, the analysis means 16 calculates the angle θ indicating the traveling direction T of the waves 30 based on the ratio of the length of the first major axis equivalent portion 44A and the second major axis equivalent portion 44B calculated as described above. calculate. Here, the angle θ includes an angle θ ₁ formed by the photographing direction P ₁ of one photographing means 14A and the traveling direction T of the waves 30 in plan view, and a photographing direction P ₂ of the other photographing means 14B. There is an angle θ ₂ formed by the traveling direction T of the wave 30 and the traveling direction T of the wave 30. Therefore, first, the method of determining the angle θ ₁ using one of the imaging means 14A as a reference will be explained. As can be confirmed in FIG. 6(b), the length of the first major axis equivalent portion 44A is the length of the major axis 42. It can be expressed approximately by multiplying the angle by sin θ ₁ , which is the sine of the angle θ ₁ . On the other hand, the length of the second major axis equivalent portion 44B can be approximately expressed by multiplying the length of the major axis 42 by cos θ ₁ , which is the cosine of the angle θ ₁ . Therefore, the analysis means 16 calculates the angle θ ₁ using these relationships, and specifies the traveling direction T of the waves 30 as the incident angle θ ₁ of the waves 30 with respect to the photographing direction P ₁ of the one photographing means 14A. .

Next, to explain how to obtain the angle θ ₂ using the other photographing means 14B as a reference, as can be confirmed in FIG. 6(b), the length of the first major axis equivalent portion 44A is equal to It can be approximately expressed by multiplying by cos θ ₂ , which is the cosine of θ ₂ . On the other hand, the length of the second major axis equivalent portion 44B can be approximately expressed by multiplying the length of the major axis 42 by sin θ ₂ , which is the sine of the angle θ ₂ . Therefore, the analysis means 16 uses these relationships to calculate the angle θ ₂ and specifies the traveling direction T of the waves 30 as the incident angle θ ₂ of the waves 30 with respect to the photographing direction P ₂ of the other photographing means 14B. It is something. Note that the angles θ ₁ and θ ₂ calculated as described above both represent the traveling direction T of the waves 30, but the analysis means 16 may calculate only one of them, or may calculate both of them. It may be calculated.

The wave analysis system 10' according to the second embodiment of the present invention as described above was tested in the environment shown in FIG. 4 similarly to the wave analysis system 10 according to the first embodiment. . The two photographing means 14A and 14B are arranged so that the angle α between the two line segments connecting them and the buoy 12 is not constant because the buoy 12 moves within a certain range, but is maintained at approximately 90 degrees. It is installed in a certain position. Then, using the photographing data of the two photographing means 14A and 14B, angle θ ₁ indicating the traveling direction T of the waves 30 with one photographing means 14A as a reference, and waves with the other photographing means 14B as a reference. Both the angle θ 2 indicating the traveling direction T of 30 and the angle θ ₂ were calculated.

In FIG. 7, the vertical axis is the angle θ (θ_calculated value) calculated by the wave analysis system 10', and the horizontal axis is the angle θ (θ_true value) obtained by photographing from the sky with a drone _. The results for θ ₂ are plotted as white circles and black circles. Further, FIG. 7 shows the results for 12 waves 30 with relatively large wave heights among the waves (wake waves) 30 generated multiple times by the small boat 50. Therefore, the results of 12 times calculated using one photographing means 14A as a reference (white circles indicating θ ₁ ) and the results of 12 times calculated using the other photographing means 14B as a reference (black circles indicating θ ₂ ), A total of 24 results are included in Figure 7. Further, in FIG. 7, a line where the θ_calculated value and the θ_true value match is shown as a thick line, and a line that is separated by ±22.5 degrees from this line is shown as a thin line. When checking FIG. 7, it is found that the variation is smaller than the result of the wave analysis system 10 according to the first embodiment of the present invention shown in FIG. It can be seen that the traveling direction T of the waves 30 can be determined.

Now, according to the second embodiment of the present invention having the above configuration, it is possible to obtain the following effects. That is, the wave analysis system 10' according to the second embodiment of the present invention uses two photographing means 14A and 14B as at least one photographing means 14, as shown in FIG. The buoy 12 is simultaneously photographed by two photographing means 14A and 14B. Further, the two photographing means 14A and 14B are installed in a positional relationship such that they photograph the buoy 12 from mutually different directions in a plan view as shown in FIG. 6(b). 12 and the line segment connecting the other photographing means 14B and the buoy 12, the angle α between the two line segments is grasped. The analysis means 16 calculates two lengths regarding the movement of the buoy 12 by individually using the images of the buoy 12 photographed by these two photographing means 14A and 14B. Specifically, one of the lengths to be calculated is calculated as the trajectory of the buoy 12 moving on a plane defined by the horizontal direction T and the vertical direction in which the waves 30 travel when it sways due to the influence of the waves 30. This is the length of the first major axis equivalent portion 44A corresponding to the major axis 42 of the elliptical orbit 40 when the elliptical orbit 40 (see FIG. 3) of the buoy 12 is viewed from one photographing means 14A.

That is, when the elliptical orbit 40 of the buoy 12 is viewed from one photographing means 14A, the length of the first major axis equivalent portion 44A corresponding to the major axis 42 of the elliptical orbit 40 is the same as when the elliptical orbit 40 of the buoy 12 is viewed from the front. It is equal to or smaller than the length of the major axis 42 in the case. The analysis means 16 determines the length of the first major axis equivalent portion 44A from the image of the buoy 12 taken by one of the photographing means 14A. Further, the other length calculated by the analysis means 16 is a second major axis equivalent portion corresponding to the major axis 42 of the elliptical orbit 40 of the same buoy 12 when viewed from the other photographing means 14B. The length is 44B. That is, when the elliptical orbit 40 of the buoy 12 is viewed from the other photographing means 14B, the length of the second major axis equivalent portion 44B corresponding to the major axis 42 of the elliptical orbit 40 is the same as when the elliptical orbit 40 of the buoy 12 is viewed from the front. It is equal to or smaller than the length of the major axis 42 in the case. The analysis means 16 determines the length of the second major axis equivalent portion 44B from the image of the buoy 12 taken by the other photographing means 14B.

Furthermore, the analysis means 16 analyzes the traveling direction T of the waves 30 based on the ratio of the two lengths calculated as described above. Here, since the two photographing means 14A and 14B are in the above-mentioned positional relationship, the length of the first major axis equivalent portion 44A and the second major axis equivalent portion 44B are different from each other in one photographing mode in plan view. There is a correlation with respect to the angle θ ₁ (or θ ₂ ) formed by the direction P ₁ (or P ₂ ) from the means 14A (or the other photographing means 14B) toward the buoy 12 and the traveling direction T of the waves 30. That is, although not limited to this, as in the example of FIG. , approximately 90 degrees. In this case, when one photographing means 14A is used as a reference, the length of the first major axis equivalent portion 44A is equal to the length of the major axis 42 of the elliptical orbit 40 of the buoy 12, and the plane It can be approximated by the value multiplied by the sine (sin θ ₁ ) of the angle θ ₁ formed by the direction P ₁ from one photographing means 14A toward the buoy 12 in visual terms and the traveling direction T of the waves 30. Further, the length of the second major axis equivalent portion 44B can be approximated by a value obtained by multiplying the length of the major axis 42 of the elliptical orbit 40 of the buoy 12 by the cosine (cos θ ₁ ) of the angle θ ₁ .

Similarly, when the other photographing means 14B is taken as a reference, the length of the first major axis equivalent portion 44A is the length of the major axis 42 of the elliptical orbit 40 of the buoy 12, and the distance from the other photographing means 14B to the buoy 12 in plan view. It can be approximated by a value multiplied by the cosine (cos θ ₂ ) of the angle θ ₂ formed by the heading direction P ₂ and the traveling direction T of the waves 30. Further, the length of the second major axis equivalent portion 44B can be approximated by a value obtained by multiplying the length of the major axis 42 of the elliptical orbit 40 of the buoy 12 by the sine (sin θ ₂ ) of the angle θ ₂ . Unlike the example in FIG. 6(b), when the angle α is different from 90 degrees, correction is performed according to the angular difference between the angle α and 90 degrees, and the first and second major axis equivalent portions 44A, 44B are Just calculate the length. Therefore, from the ratio of the length of the first major axis equivalent portion 44A to the second major axis equivalent portion 44B, the direction _P1 from one photographing means 14A (or the other photographing means 14B) toward the buoy 12 in plan view. (or P ₂ ) and the traveling direction _T of the waves 30 can be found, and from this the traveling direction T of the waves ₃₀ can be calculated. In this way, by using the images obtained from the two photographing means 14A and 14B, the analysis accuracy is improved, and the traveling direction T of the waves 30 can be efficiently determined by using the ratio of the two lengths that have a correlation. It becomes possible to analyze.

Further, in the wave analysis system 10' according to the second embodiment of the present invention, the analysis means 16 calculates the length of the first major axis equivalent portion 44A by one of the two photographing means 14A and 14B. It is calculated based on the horizontal displacement of the buoy 12 as viewed from one of the photographing means 14A, which is extracted from the photographic data of the buoy 12 photographed by the photographing means 14A. That is, since the major axis 42 of the elliptical orbit 40 of the buoy 12 is parallel to the horizontal direction, the length of the major axis 42 is equal to the displacement amount of the buoy 12 in the horizontal direction. Such a relationship is the same when the elliptical orbit 40 of the buoy 12 is viewed from one photographing means 14A, so the length of the first major axis equivalent portion 44A parallel to the horizontal direction is It can be determined from the displacement of the buoy 12 in the horizontal direction as seen from the angle, and is equal to the amount of displacement.

Similarly, the analysis means 16 extracts the length of the second major axis equivalent portion 44B from the photographic data of the buoy 12 photographed by the other photographing means 14B of the two photographing means 14A, 14B. It is calculated based on the horizontal displacement of the buoy 12 as seen from the photographing means 14B. That is, as in the case of the first major axis equivalent portion 44A, the length of the second major axis equivalent portion 44B parallel to the horizontal direction can be determined from the horizontal displacement of the buoy 12 as seen from the other photographing means 14B. and is equal to the amount of displacement. As described above, the wave analysis system 10' according to the second embodiment of the present invention mainly uses the horizontal displacement of the buoy 12 obtained from the photographing data of the buoy 12 by the two photographing means 14A and 14B. By performing the analysis using the following methods, it is possible to improve the efficiency and practicality of the analysis.

Next, a wave analysis system 10'' according to a third embodiment of the present invention will be explained with reference to FIG. 8. In FIG. The same parts as the systems 10, 10' or corresponding parts are given the same reference numerals.The wave analysis system 10'' according to the third embodiment of the present invention is different from the wave analysis system 10'' according to the Only the differences from the wave analysis systems 10 and 10' according to the second embodiment and the second embodiment will be explained, and the same wave analysis systems 10 and 10' according to the first and second embodiments of the present invention The explanation of the configuration of the part will be omitted.

As shown in FIG. 8, a wave analysis system 10'' according to the third embodiment of the present invention includes a buoy 12, a photographing means 14, an analysis means 16, and a monitoring means 18. It is installed near the construction zone (prescribed water area) 54, and in this embodiment, any one of the plurality of buoys 12 (only three are shown in FIG. 8) installed to display the construction zone 54. The two buoys 12 are photographed by the photographing means 14.The monitoring means 18 is connected to the analysis means 16 by any connection method so as to obtain the analysis results from the analysis means 16. However, like the photographing means 14 and the analyzing means 16, the analyzing means 18 may be installed at another fixed position that is not affected by the waves 30. Based on the analysis result of the analysis means 16, the arrival of waves 30 generated around the buoy 12 photographed by the photographing means 14 to the construction area 54 is monitored. Based on the calculated traveling direction T of the waves 30, determining whether the waves 30 will arrive at the construction section 54, presenting the direction of arrival when the waves 30 arrive at the construction section 54, and indicating whether the waves 30 will arrive at the construction section 54. We will issue notifications, etc.

In addition, if the analysis result of the analysis means 16 includes the height of the waves 30, the height of the waves 30 is also monitored, and waves 30 with a height exceeding a preset threshold value arrive at the construction area 54. It is also possible to determine whether or not such waves 30 will occur, and to issue an alert when such waves 30 arrive. When issuing the alarm, the monitoring means 18 may issue the alarm by display or may issue the alarm by sound. Any PC installed with a dedicated program can be used as the monitoring means 18, or the analysis means 16 and the monitoring means 18 may be configured in one PC. Note that in the example of FIG. 8, the traveling direction T of the waves 30 is analyzed based on photographic data of the buoy 12 by one photographing means 14, but the wave analysis according to the third embodiment of the present invention The system 10'' is not limited to this. In other words, the wave analysis system 10'' includes two photographing means 14A and 14B, like the wave analysis system 10' according to the second embodiment of the present invention. The traveling direction T of the waves 30 may be analyzed based on photographic data of the buoy 12 by.

According to the third embodiment of the present invention having the above configuration, it is possible to obtain the following effects. That is, in the wave analysis system 10'' according to the third embodiment of the present invention, as shown in FIG. The monitoring means 18 further includes a monitoring means 18 for monitoring the arrival of waves 30. That is, the monitoring means 18 determines whether the waves 30 generated around the buoy 12 are in a predetermined direction based on the analysis result including the traveling direction T of the waves 30 by the analysis means 16. It monitors things such as whether waves are arriving at the water area 54 and if so, from what direction.This allows for lower equipment configuration and installation costs compared to conventional equipment that monitors waves 30. It is possible to provide more accurate wave 30 attack information while suppressing the wave 30 attack.

Further, in the wave analysis system 10'' according to the third embodiment of the present invention, the monitoring means 18 monitors the arrival of waves 30 to the construction section 54 of the waterworks, and at this time, the photographing means 14 photographs the wave 30. As the buoy 12, the buoy 12 used to indicate the work area, which must be installed during the construction of waterworks, is used.This eliminates the need to install a dedicated buoy 12 for use with this system 10'', reducing costs. can be further suppressed. Furthermore, it is possible to efficiently monitor the arrival of waves 30 to the work area 54 of the waterworks, and as a result, it is possible to further improve the safety of the construction workers. Note that the wave analysis system 10'' according to the third embodiment of the present invention is not limited to application to the work area 54 of water construction, but can be applied to any predetermined water area 54, for example, A predetermined water area 54 within the port may be monitored for port management.

Here, in the wave analysis systems 10, 10', 10'' according to the first to third embodiments of the present invention described above, the traveling direction T of the waves 30 is analyzed based on the photographic data of one buoy 12. As an application of this, the wave analysis system according to the embodiment of the present invention calculates the traveling direction of waves 30 generated around each buoy 12 from photographic data of a plurality of buoys 12 installed in the same water body. T may be calculated and the results combined to perform a composite analysis of the waves 30.Also, if possible, two or more buoys 12 may be photographed simultaneously using one photographing means 14, and the photographed data may be The movement of each buoy 12 may be individually extracted from the buoy 12, the traveling direction T of the waves 30 generated around each buoy 12 may be calculated, and the results may be combined to perform a composite analysis of the waves 30.

10, 10', 10'': Wave analysis system, 12: Buoy, 14 (14A, 14B): Photographing means, 16 (16A, 16B): Analysis means, 18: Monitoring means, 30: Waves, 40: Buoy ellipse Trajectory, 42: Major axis, 44: Portion corresponding to major axis, 44A: Portion corresponding to first major axis, 44B: Portion corresponding to second major axis, 54: Predetermined water area (work section), T: Wave direction, α: Photographing means and Angle between the line connecting the buoy

Claims (7)

A system for analyzing the direction of movement of waves,
A buoy placed on the water,
at least one photographing means installed at a fixed position unaffected by waves and photographing an image of the buoy;
analysis means for analyzing the traveling direction of waves generated around the buoy based on the image of the buoy taken by the at least one photographing means,
The analysis means determines, from an image of the buoy taken by the at least one photographing means, a trajectory of the buoy moving on a plane defined by a horizontal direction and a vertical direction in which the waves travel under the influence of waves. calculating the length of a portion corresponding to the major axis of the elliptical orbit when viewed from the at least one imaging means, and analyzing the traveling direction of the waves based on the calculation result ;
The at least one photographing means includes one photographing means,
The analyzing means determines, from the image of the buoy taken by the one photographing means, the trajectory of the buoy moving on a plane defined by the horizontal direction and the vertical direction in which the waves travel under the influence of waves. The length of the major axis of the elliptical orbit as , and the length of the major axis equivalent portion corresponding to the major axis when the elliptical orbit is viewed from the one imaging means, and the calculated length of the major axis and the major axis equivalent portion. A wave analysis system characterized by analyzing the direction of movement of waves based on the ratio of the length of the wave to the length of the wave . The analysis means calculates the length of the major axis based on the height and period of waves obtained from the vertical movement of the buoy as seen from the one photographing means and the water depth at the preset installation position of the buoy. 2. The wave analysis system according to claim 1 , further comprising calculating the length of the buoy and also calculating the length of the portion corresponding to the major axis based on a horizontal displacement of the buoy as seen from the one photographing means. A system for analyzing the direction of movement of waves,
A buoy placed on the water,
at least one photographing means installed at a fixed position unaffected by waves and photographing an image of the buoy;
analysis means for analyzing the traveling direction of waves generated around the buoy based on the image of the buoy taken by the at least one photographing means,
The analysis means determines, from an image of the buoy taken by the at least one photographing means, a trajectory of the buoy moving on a plane defined by a horizontal direction and a vertical direction in which the waves travel under the influence of waves. calculating the length of a portion corresponding to the major axis of the elliptical orbit when viewed from the at least one imaging means, and analyzing the traveling direction of the waves based on the calculation result;
The at least one photographing means includes two photographing means, and the two photographing means are installed in a positional relationship so as to photograph the buoy from mutually different directions in a plan view,
The analysis means calculates a plane defined by a horizontal direction and a vertical direction in which the waves advance when the buoy is influenced by waves, from an image of the buoy taken by one of the two photographing means. Calculate the length of a first major axis corresponding to the major axis of the elliptical orbit when the elliptical orbit as a locus moving above is viewed from the one photographing means, and From the image of the buoy taken by the other photographing means, the length of the second major axis corresponding to the major axis when the elliptical orbit is viewed from the other photographing means is calculated. A wave analysis system characterized in that the direction of movement of waves is analyzed based on the ratio of the length of the first major axis equivalent portion to the length of the second major axis equivalent portion. The analysis means calculates the length of a portion corresponding to the first major axis based on the horizontal displacement of the buoy as seen from the one photographing means, and calculates the length of the buoy as seen from the other photographing means. 4. The wave analysis system according to claim 3 , wherein the length of the second major axis equivalent portion is calculated based on displacement in the horizontal direction. 5. The analyzer according to claim 1, wherein the analyzing means analyzes at least one of the wave period, wave height, and water level fluctuations in addition to the traveling direction of the waves. Wave analysis system. The buoy is installed near a predetermined water body,
6. The method according to any one of claims 1 to 5 , further comprising monitoring means for monitoring the arrival of waves generated around the buoy to the predetermined water area based on the analysis result of the analysis means. wave analysis system. The specified water area is a construction area for waterworks,
7. The wave analysis system according to claim 6 , wherein the buoy is a buoy for displaying the work area, which is installed to indicate the work area.

Images