JP2018004529A - Buoy type wave height measurement device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a buoy type wave height measurement device capable of easily installing a buoy used for measurement and capable of measuring a correct wave height in a construction site and the like quick in water surface fluctuation.SOLUTION: A buoy type wave height measurement device includes a buoy 20 having: a spherical floating body 12 for measurement having a center of gravity in the lower part; displacement measuring means 13a capable of measuring or calculating a vertical displacement of the floating body 12 for measurement; a shell 21 for relatively and movably storing the floating body 12 for measurement; and a fluid 22 interposed between the shell 21 and the floating body 12 for measurement. The buoy type wave height measurement device is configured to measure or calculate the vertical displacement of the buoy 20 following the water surface fluctuation.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a buoy-type wave height measuring device for measuring a wave height mainly at a construction site such as offshore construction.

  In the construction site on the sea such as in a harbor, the wave height standard at the time of work may be set from the viewpoint of safety, and in that case, it is necessary to grasp the actual wave height in the working sea area.

  In this case, for large ports, observation data on wave heights is provided by public organizations such as the Port Bureau of the Ministry of Land, Infrastructure, Transport and Tourism, and private companies, and it is possible to grasp the wave heights in the working sea area by using this data. It is.

  However, the actual construction site is often far from the observation point of the provided wave height observation data, and it is difficult to say that the observation data indicates the wave height near the actual construction site.

  Therefore, conventionally, a wave height meter is installed at the construction site to measure the actual wave height. Examples of the wave height meter include a seafloor installation type, aerial radiation type, and a buoy type wave height meter.

  However, the seafloor-type wave height meter uses a measuring instrument such as an ultrasonic sensor or a water pressure sensor installed on the seabed to detect fluctuations in the water surface, and it is necessary to install a measuring instrument on the seabed by a diver. There is a problem that the operation is not easy, and the installation is difficult particularly in a deep water region having a depth of 50 m or more.

  Also, in this submarine wave height meter, when data is acquired in real time, it is difficult to transmit data wirelessly, so a submarine measuring instrument is connected to a marine relay buoy or a device on a work ship with a cable. There was a problem that it was necessary.

  The aerial radiation wave height meter emits ultrasonic waves in the vertical direction toward the sea surface from devices installed on offshore structures, etc., and captures fluctuations in the water surface from its reflection. This type of wave height meter is used for work ships. In this case, the oscillation angle of the ultrasonic wave and the position of the device that transmits and receives the ultrasonic wave fluctuate due to the swinging of the work ship, so that the measurement value needs to be corrected in consideration of the fluctuation, and the calculation is complicated was there.

  On the other hand, a buoy wave height meter floats a buoy with a built-in measuring instrument on the sea surface, and measures the vertical displacement of the buoy that follows the fluctuation of the water surface. Installation by human power is possible.

  In the buoy type wave height meter, for example, the vertical acceleration of the buoy following the fluctuation of the water surface is measured by an acceleration sensor, and the vertical displacement of the water surface is calculated by integrating the acceleration twice over time. Is known (see, for example, Patent Document 1).

  A buoy-type measuring instrument is also known in which a measuring instrument is installed on a buoy body via a gimbal mechanism in consideration of the influence of waves, winds, and tidal currents.

JP-A-8-278130

  However, in the conventional buoy wave height meter as described above, if the buoy is light, it drifts under the influence of waves, winds, and tidal currents, so it cannot stay in the water area where observation is desired. There was a problem that it was not suitable for measurement.

  Further, in the buoy type wave height meter, as shown in FIG. 5 (a), when the light buoy 2 is moored by the mooring cable 3 to the ship 1 such as a monitoring ship or the sinker 4 installed on the bottom of the water, When an external force acts on the buoy 2 via the mooring cable 3, the buoy 2 tilts together with the measuring unit, and the operation of following the water level fluctuation of the buoy 2 is restricted, so an accurate wave height is measured. There is a risk that it will not be possible.

  On the other hand, in order to prevent the buoy from being swept away by high waves, it is necessary to increase the size of the buoy and increase its weight, so there is a problem that installation work by manpower is difficult. Since the weights of the rope and the mooring anchor also increase relatively, there is a problem that they are not versatile because their installation work is difficult.

  In addition, in such a buoy type wave height meter, if the weight of the buoy increases, the buoy's motion characteristics can only follow the slow fluctuation of the water surface, which is not suitable for wave height measurement at construction sites where the water surface fluctuation is fast. There was also a problem.

  Furthermore, since the gimbal mechanism is affected by waves, winds, and tidal currents from various directions at sea, the followability in the three-axis directions is restricted by the support shafts, so the leveling of the measuring instrument is ensured accurately. There was a problem that it was difficult.

  Therefore, in view of such a conventional problem, the present invention aims to provide a buoy-type wave height measuring device capable of easily installing a buoy used for measurement and capable of accurately measuring a wave height at a construction site where water surface fluctuation is fast. It was made.

  The feature of the invention described in claim 1 for solving the conventional problem as described above is that in the buoy type wave height measuring device for measuring the wave height based on the vertical displacement of the buoy floating on the water surface, the buoy is disposed at a lower portion. A spherical measurement floating body having a center of gravity, a displacement measuring means capable of measuring or calculating the vertical displacement of the measurement floating body, an outer shell body that accommodates the measurement floating body in a relatively movable manner, the outer shell body, and the A buoy-type wave height measuring device including a fluid interposed between a measurement floating body and a fluid.

  A feature of the invention described in claim 2 is that, in addition to the structure of claim 1, the outer shell body includes a mooring member to which one end of a mooring line is connected.

  According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, the displacement measuring means includes an acceleration sensor capable of measuring an acceleration in the three-axis direction of the measurement floating body, and positional information of the measurement floating body. And a position measuring device capable of acquiring

  According to a fourth aspect of the present invention, in addition to the configuration of any one of the first to third aspects, the displacement measuring means includes an acceleration sensor built in the measurement floating body, and an acceleration measured by the acceleration sensor. And a calculation unit that calculates the vertical displacement of the measurement floating body, so that the acceleration sensor and the calculation unit can perform wireless communication.

  As described above, the buoy wave height measuring device according to the present invention is a buoy wave height measuring device that measures the wave height based on the vertical displacement of the buoy floating on the water surface. A floating body, a displacement measuring means capable of measuring or calculating the vertical displacement of the measuring floating body, an outer shell body that accommodates the measuring floating body in a relatively movable manner, and between the outer shell body and the measuring floating body Since the measurement floating body is always unaffected by the external force acting on the outer shell body, a stable posture can be maintained and the wave height can be accurately measured. In addition, since the measurement floating body is not constrained by the outer shell body, it is less affected by waves, winds, and tidal currents, and can be handled in all directions.

  Further, in the present invention, the outer shell body includes a mooring member to which one end of the mooring line is connected, so that the buoy can be held in a desired water area, which corresponds to wave height measurement at a construction site or the like. be able to.

  Furthermore, in the present invention, the displacement measuring means includes an acceleration sensor capable of measuring the acceleration in the three-axis direction of the measurement floating body, and a position measuring device capable of acquiring position information of the measurement floating body. Thus, the position coordinates of the buoy can be measured together with the wave height measurement.

  Furthermore, in the present invention, the displacement measuring means includes an acceleration sensor built in the measurement floating body, and an arithmetic unit that calculates the vertical displacement of the measurement floating body based on the acceleration measured by the acceleration sensor. The acceleration sensor and the calculation unit can be wirelessly communicated, whereby the buoy can be reduced in size and weight, and the wave height can be measured without depending on the water depth.

It is a side view which shows an example of the buoy type wave height measuring apparatus which concerns on this invention. (A) is a top view which shows the buoy part in FIG. 1, (b) is the longitudinal cross-sectional view. It is a fragmentary sectional view which shows the other usage condition of the buoy type wave height measuring apparatus which concerns on this invention. It is a schematic side view which shows the state where the conventional buoy type wave height meter was moored, Comprising: (a) is the state moored to the ship, (b) is a figure which shows the state moored to the water bottom part.

  Next, an embodiment of the buoy-type wave height measuring device according to the present invention will be described based on the embodiment shown in FIGS. In addition, the same code | symbol is attached | subjected and demonstrated to the structure similar to the above-mentioned conventional example, the code | symbol 1 is ships, such as a monitoring ship, the code | symbol 3 is a mooring line, and the code | symbol 20 is a buoy which comprises a wave height measuring apparatus.

  This buoy-type wave height measuring device includes a buoy 20 floated on the water surface, and uses the buoy 20 to measure the wave height of a desired water area.

  As shown in FIG. 2, the buoy 20 includes a spherical measurement floating body 12, an outer shell body 21 that accommodates the measurement floating body 12 in a relatively movable manner, and the measurement floating body 12 and the outer shell body 21. And an intervening fluid 21.

  The measurement floating body 12 is made of a material that is lightweight and can transmit radio waves, and includes a weight 15 disposed on the bottom and a mounting table 16 disposed on the weight 15, and a displacement measuring unit is provided on the mounting table 16. The sensor part 13a which consists of an acceleration sensor etc. which comprise is installed.

  The measurement floating body 12 has a center of gravity that is stabilized by the weight 15, and is not substantially rotated while floating on the fluid 22.

  The sensor unit 13 a includes an acceleration sensor that can measure the acceleration in the three-axis directions of the measurement floating body 12, and a position measuring instrument that can acquire the position information of the measurement floating body 12.

  The acceleration sensor wirelessly transmits the measured acceleration in the three-axis direction of the measurement floating body 12 to the calculation unit 13b such as a computer on the ship 1, and the calculation unit 13b integrates each direction of the measurement floating body 12 by integration with time. The displacement is calculated almost in real time.

  The position measuring device uses, for example, a GNSS (Global Navigation Satellite System) device, and can transmit the accurate position coordinates of the measurement floating body 12 (buoy 20) to the calculation unit 13b wirelessly.

  The displacement measuring means is such that the buoy 11 is exposed on the water surface and wireless communication is possible with the ship 1 such as a monitoring ship. The calculation unit 13b can be configured separately, and the size and weight of the measurement floating body 12 that can be carried by human power can be reduced by minimizing the portion built in the measurement floating body 12.

  The outer shell body 21 is formed into a hollow sphere by a member that is water-permeable and capable of transmitting radio waves, and has an inner diameter larger than the outer diameter of the measurement floating body 12. The shape of the outer shell body 21 is not limited to a hollow sphere, and any shape may be used as long as the measurement floating body 12 can be movably accommodated therein. For example, the outer shell body 21 may have a hollow polyhedral shape.

  The outer shell 21 is composed of an upper half 21a and a lower half 21b in which a sphere or a polyhedron is halved, and the upper half 21a and the lower half 21b are detachably connected to each other. .

  The connecting means between the upper half 21a and the lower half 21b includes, for example, a male screw portion 23 and a female screw portion 24 at the opening edge portion, respectively, and is fitted in a state where water is stopped by screwing each other. .

  On the other hand, the upper half 21a is provided with an inlet 25 through which the fluid 22 can be injected at the top, and the fluid 22 is injected from the inlet 25 in a state where the measurement floating body 12 is accommodated in the outer shell 21, thereby A fluid 22 is interposed between the shell 21 and the measurement floating body 12, and the measurement floating body 12 is accommodated in the outer shell 21 in a state of floating on the fluid 22. Reference numeral 26 in the figure denotes a cap that closes the inlet 25 so as to be opened and closed.

  A hook-like mooring member 27 projects from the outer surface of the upper half 21a, and the buoy 20 can be moored by connecting one end of the mooring cable 3 to the mooring member 27.

  The fluid 22 is mainly water or oil, and the amount thereof is such that the measurement floating body 12 floats on the fluid 22 and the top of the measurement floating body 12 does not contact the inner wall of the outer body 21. The draft of the buoy 20 as a whole can be adjusted by adjusting the type and amount of the fluid 22.

  In the buoy-type wave height measuring apparatus configured as described above, as shown in FIG. 1, the buoy 20 has a double structure in which a fluid 22 is interposed. Since the horizontality is always ensured even when the outer shell body 21 is tilted without being restricted by the external force acting on the body, the vertical acceleration necessary for calculating the wave height can be easily extracted, and the wave height can be easily calculated. Can do.

  Moreover, in this buoy type wave height measuring apparatus, since the measurement floating body 12 is not restrained with respect to the outer shell body 21, the measurement floating body 12 is not easily influenced by waves, winds, and tidal currents acting on the buoy 20. It can respond in all directions.

  Moreover, in this buoy-type wave height measuring apparatus, the buoy 20 can be kept in a desired water area by mooring the buoy on a ship 1 such as a monitoring ship, and the wave height of the water area can be measured.

  Moreover, since the measurement data measured by the sensor part 13a built in the measurement floating body 12 can be transmitted to the ship 1 by radio, the wave height can be measured substantially in real time.

  In the above-described embodiment, the example in which the buoy 20 is moored to the ship 1 has been described. However, the object is not limited to the ship 1, and one end of the mooring line 3 is installed at the bottom of the water as shown in FIG. It may be connected to the sinker 4 and moored to the bottom of the water, or may be moored to a ground structure such as a quay. Moreover, in this buoy-type wave height measuring apparatus, you may make it measure in the state which made the buoy 20 drift.

  In the above-described embodiment, an example in which an acceleration sensor is used as the displacement measuring unit has been described. However, the displacement measuring unit is not limited to this, and may be configured by only a GNSS device, for example.

1 Vessel (Monitoring Vessel)
3 Mooring cable 12 Measurement floating body 13a Sensor unit 13b Calculation unit 15 Weight 16 Mounting table 20 Buoy 21 Outer shell body 22 Fluid 23 Male thread part 24 Female thread part 25 Inlet 26 Cap 27 Mooring member

Claims (4)

In a buoy-type wave height measurement device that measures the wave height based on the vertical displacement of a buoy floating on the water surface,
The buoy includes a spherical measurement floating body having a center of gravity at a lower portion, a displacement measurement unit capable of measuring or calculating a vertical displacement of the measurement floating body, an outer shell body that accommodates the measurement floating body in a relatively movable manner, A buoy-type wave height measuring device comprising a fluid interposed between the outer shell and the measurement floating body.   The buoy-type wave height measuring device according to claim 1, wherein the outer shell body includes a mooring member to which one end of a mooring line is connected.   The displacement measuring means includes an acceleration sensor capable of measuring an acceleration in the three-axis direction of the measurement floating body, and a position measuring device capable of acquiring position information of the measurement floating body. Buoy type wave height measuring device.   The displacement measuring means includes an acceleration sensor built in the measurement floating body, and an arithmetic unit that calculates the vertical displacement of the measurement floating body based on the acceleration measured by the acceleration sensor, and the acceleration sensor and the The buoy-type wave height measuring device according to claim 1, wherein the buoy-type wave height measuring device is configured to perform wireless communication with the calculation unit.

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