JP2019035672A - Buoy-type tidal flow measurement device and tidal flow measurement method - Google Patents

Abstract

To provide a buoy-type tidal flow measurement device and a tidal flow measurement method capable of measuring the flow rate even in a remote area with a simple structure.SOLUTION: A buoy-type tidal flow measurement device 3 includes: a buoy 4 floated on a water surface 1; attitude keeping means for keeping the buoy 4 in a predetermined reference attitude; a fluid receiving body 5 disposed underwater; a tidal flow transmission member 6 for connecting the buoy 4 to the fluid receiving body 5; angle measuring means for measuring the angle value with respect to a reference attitude of the buoy; and calculating means 18 for calculating the flow rate of the tidal flow on the basis of the angle value with respect to the reference attitude of the buoy 4. By an inclination of the buoy 4 from the reference attitude to the tidal flow direction in conjunction with the tidal flow received by the fluid receiving body 5, the flow rate can be determined on the basis of the angle value.SELECTED DRAWING: Figure 1

Description

  The present invention mainly relates to a buoy-type tidal current measuring device and a tidal current measuring method for measuring a tidal velocity at a construction site such as offshore construction.

  In the construction site on the sea such as in a harbor, it is often necessary to grasp the flow velocity and flow direction of the tidal current in the working sea area from the viewpoint of safety and quality assurance.

  For example, when dropping materials such as stones to the bottom of the water, the drop position varies depending on the tide, so it is necessary to drop the material in consideration of the actual tide to install the material at the desired position. .

  In addition, in dredging work with a grab bucket, the grab bucket lowered into the water is washed away by the tidal current, and the bottom position of the grab bucket may deviate from the planned excavation position. It is necessary to manage the position of.

  Therefore, conventionally, a method of grasping the flow velocity caused by the tide level fluctuation by actually measuring the flow velocity using a flowmeter such as a direct-reading electromagnetic flow velocity meter or a multilayer flow direction flow velocity meter (ADCP) is used. .

  The direct-reading electromagnetic current meter is configured to measure a flow velocity by installing a sensor on the seabed and capturing a change in the electromagnetic field around the sensor (see, for example, Patent Document 1).

  The multi-layer flow direction anemometer emits ultrasonic waves toward the water from a device installed on a work boat or the like, and measures the flow velocity from reflection from minute objects in the water (for example, see Patent Document 2). .

JP 09-133558 A Japanese Patent Laid-Open No. 2006-183464

  However, the direct-reading electromagnetic velocimeter as described above captures changes in the electromagnetic field around the sensor installed in the sea, and when acquiring data in real time, it is difficult to transmit data wirelessly. There is a problem that it is necessary to connect the relay buoy or the device on the work ship with a cable.

  On the other hand, in the multilayer flow direction anemometer as described above, since the ultrasonic radiation angle and the position of the device that transmits and receives the ultrasonic wave fluctuate due to the swinging of the work ship, it is necessary to correct the measurement value in consideration of the fluctuation. There was a problem that the calculation was complicated.

  In addition, this type of multi-layer flow direction anemometer can check the measurement data in real time by connecting it to the computer equipment via a cable on the installed ship etc., but the measurement data at a position away from the observation site. In order to confirm this, a transmission system for that purpose is required.

  Therefore, in view of such a conventional problem, the present invention has been made for the purpose of providing a buoy-type tidal current measuring device and a tidal current measuring method that can be measured even in a remote place with a simple structure.

  The feature of the invention according to claim 1 for solving the conventional problem as described above is that the buoy floated on the water surface, the posture maintaining means for maintaining the buoy in a predetermined reference posture, and disposed in the water. Receiving flow, a tidal current transmission member connecting the buoy and the receiving fluid, an angle measuring means for measuring an inclination angle of the buoy with respect to a reference attitude, and a flow velocity of the tidal current based on the inclination angle of the buoy with respect to the reference attitude. The buoy-type tidal current measuring device includes a calculating means for calculating and configured to tilt the buoy in a tidal direction from the reference posture in conjunction with a tidal current received by the receiving fluid.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, there is provided an azimuth detecting means for detecting the inclination direction of the buoy.

  According to a third aspect of the invention, in addition to the configuration of the first or second aspect, the posture maintaining means is constituted by a measurement unit including the angle measurement means built in the buoy.

  According to a fourth aspect of the present invention, in addition to the structure of any one of the first to third aspects, a frame body moored via a mooring line is provided, and the buoy is rotatably held in the frame body. There is in being.

  A feature of the invention described in claim 5 is that a buoy connected to a receiving fluid and a tidal current transmission member is used, and the buoy is floated on the water in a state where the receiving fluid is disposed in water, and the tidal current received by the receiving fluid is The buoy is tilted in the tidal direction from a reference posture in conjunction with the buoy, the tilt angle of the buoy is measured, and the flow velocity of the tidal current is calculated based on the tilt angle of the buoy.

  The buoy-type tidal current measurement device according to the present invention can measure the flow velocity of a desired water area with a simple structure by including the configuration according to claim 1.

  Further, in the present invention, by providing the configuration according to claim 2, it is possible to detect the direction of the tidal current along with the flow velocity.

  Furthermore, in the present invention, by providing the configuration according to the third aspect, it is not necessary to facilitate a separate weight or the like, the number of parts can be reduced, and the buoy can be reduced in size and weight.

  Furthermore, in the present invention, the buoy can be kept in a desired water area and the tidal current in the water area can be measured by providing the configuration according to claim 4.

  The tidal current measurement method according to the present invention can measure the tidal flow velocity by a simple method by including the configuration according to claim 5.

It is a side view which shows the outline of the buoy type tidal current measuring device which concerns on this invention. It is a top view same as the above. FIG. 2 is a longitudinal sectional view showing a buoy in FIG. It is a graph which shows the relationship between the inclination angle of a buoy, and the flow velocity. It is a side view for demonstrating the tidal current measuring method using the buoy-type tidal current measuring device based on this invention, (a) is a reference posture, (b) is a state in case the flow velocity is low, (c) is a flow velocity. It is a figure which shows the state in the case of being high.

  Next, an embodiment of a buoy-type tidal current measuring apparatus according to the present invention will be described based on the examples shown in FIGS. In the figure, reference numeral 1 denotes a water surface, reference numeral 2 denotes a water bottom, and reference numeral 3 denotes a buoy-type tidal current measuring device.

  This buoy-type tidal current measuring device 3 includes a buoy 4 floated on a water surface 1, posture maintaining means for maintaining the buoy 4 in a predetermined reference posture, a receiving fluid 5 disposed in water, a buoy 4 and a receiving fluid. 5, an angle measuring means such as an angle sensor 7 that measures an inclination angle of the buoy 4 with respect to the reference attitude, and an arithmetic means that calculates the flow velocity of the tidal current based on the inclination angle of the buoy 4 with respect to the reference attitude. And. The predetermined reference posture refers to a posture in which the buoy 4 suspended on the still water surface in a state where the flow velocity is zero is stable.

  The buoy-type tidal current measuring device 3 includes a frame body 9 moored to the water bottom 2 or the like via a mooring line 8. The buoy 4 is rotatably held in the frame body 9. It stays in the water area and can measure the flow velocity and flow direction of the water area.

  As shown in FIG. 3, the buoy 4 is formed in a hollow sphere shape with a material that has water shielding properties and allows radio waves to pass through, and a measurement unit 10 including an angle measurement means is incorporated in the lower half of the buoy 4.

  Further, the buoy 4 is provided with rotation support shafts 11 and 11 projecting from the outer peripheral surface, and the rotation support shafts 11 and 11 are rotatably held by the frame body 9. It can be rotated around 11.

  The frame body 9 is formed in a frame shape such as an annular shape, a U-shape or a U-shape, and is floated on the water surface 1 in a state of being anchored by being anchored to an anchor 12 installed on the bottom 2 or the like via a mooring line 8. It has been.

  Further, the buoy 4 includes a transmission member connecting portion 13 to which one end of a tidal current transmission member 6 made of a rope or the like is rotatably connected to the lower end thereof, and the fluid receiving fluid 5 is connected via the tidal current transmission member 6. .

  The receiving fluid 5 includes a receiving portion 14 that receives a tidal pressure, and moves in the tidal direction by the tidal pressure received by the receiving portion 14.

  In this embodiment, the receiving fluid 5 is formed in a tapered cylindrical shape with both ends in the central axis direction opened, and the inner peripheral surface of the tapered cylindrical shape is the receiving portion 14.

  The receiving fluid 5 is connected to one end of the tidal current transmission member 6 at the end having the larger opening area, and receives the tidal current at the receiving portion 14, thereby moving in the tidal current direction, and the tidal current transmitting member 6. The pressure is transmitted to the buoy 4 via the.

  The posture maintaining means is constituted by the measurement unit 10 built in the lower half of the buoy 4, and the center of gravity of the entire buoy 4 is stabilized by the weight of the measurement unit 10. Therefore, in this embodiment, when the buoy 4 is floated on a static water surface in a state where the flow velocity is zero, the buoy 4 is stabilized in a posture in which the transmission member connecting portion 13 is directed downward, that is, a predetermined reference posture, and the state is maintained. It has come to be.

  The posture maintaining means may be provided with a weight (not shown) arranged at the bottom of the buoy 4 so that the center of gravity is stabilized by the weight.

  The measurement unit 10 includes a mounting table 15 installed in the buoy 4 so as to be horizontal at a predetermined angle, that is, a reference posture, an angle sensor 7 fixed to the mounting table 15, and a battery 16 for supplying power. The angle sensor 7 serving as an angle measuring means measures the tilt angle α of the mounting table 15 tilted with the rotation of the buoy 4. The angle sensor 7 also functions as an azimuth detecting means for detecting the tilt direction.

  Further, the measurement unit 10 includes a communication device 17 so that it can wirelessly communicate with a calculation means including a monitoring ship or a computer device 18 installed on the land, and the inclination angle of the buoy 4 measured by the angle sensor 7. α and the inclination direction are transmitted wirelessly to a calculation means such as the computer device 18, and the calculation means calculates the flow velocity of the water area in almost real time based on the inclination angle α.

  The measurement unit 10 is configured such that the buoy 4 is exposed on the water surface 1 and wireless communication is possible with a monitoring ship or a computer device 18 installed on the land. The buoy 4 can be reduced in weight and size by minimizing the portion built in the buoy 4.

  The computing means is constituted by a computer device 18, a tablet terminal or the like, and utilizes the fact that the inclination angle α of the buoy 4 and the flow velocity have a certain relationship (for example, proportional relationship) as shown in FIG. The flow velocity of the tidal current is calculated based on the inclination angle α. It should be noted that the relationship between the inclination angle α of the buoy 4 and the flow velocity is not limited to the proportional relationship shown in this embodiment, but is determined by experiments or simulation analysis by a computer according to various conditions that affect the measurement water area and the purpose of measurement. be able to.

  In the tidal current measuring method using the buoy-type tidal current measuring device 3 configured as described above, the buoy 4 in a state of being rotatably held by the moored frame body 9 is floated on the water surface 1 of the target water area, and the receiving fluid 5 Into the water.

  As shown in FIG. 5A, assuming that the receiving fluid 5 in water does not receive a tidal current, it stays in the water, so that the buoy 4 is maintained in the reference posture by the posture maintaining means.

  On the other hand, when the receiving fluid 5 receives the tidal current at the receiving portion 14, as shown in FIGS. 5B and 5C, the receiving fluid 5 moves in the tidal direction, and the pressure is transmitted to the buoy 4 via the tidal current transmission member 6. In conjunction with this, the buoy 4 is tilted from the reference posture in the tidal direction.

  At that time, the inclination angle α and the tidal flow velocity are in a fixed relationship (proportional relationship in the present embodiment), and when the tidal current is slow, as shown in FIG. When is fast, the inclination angle becomes large as shown in FIG.

  On the other hand, the measurement unit 10 measures the inclination angle α and the direction of the buoy 4 by the angle sensor 7 as needed, and transmits the measurement data to the computing means including the computer device 18 by radio.

  The calculation means uses the fact that the inclination angle α of the buoy 4 and the flow velocity shown in FIG. 4 have a certain relationship (proportional relationship in this embodiment), and is based on the inclination angle data of the buoy 4 transmitted as needed. By calculating the flow velocity of the tidal current, the flow velocity of the water area is measured in real time.

  In the above-described embodiment, an example in which the buoy 4 is rotatably held on the frame 9 and moored has been described. However, the buoy 4 is used while being floated on the water surface 1 without being moored. Also good. In that case, it is preferable to provide position measuring means for measuring the position of the buoy 4 such as GPS.

  In the above-described embodiment, an example in which the battery 16 is built in the buoy 4 as a power source has been described. However, a solar panel may be installed on the upper surface of the buoy 4 as power supply means.

DESCRIPTION OF SYMBOLS 1 Water surface 2 Water bottom 3 Buoy-type tidal current measuring device 4 Buoy 5 Receiving fluid 6 Tidal current transmission member 7 Angle sensor 8 Mooring cable 9 Frame body 10 Measurement unit 11 Rotation support shaft 12 Anchor 13 Transmission member connection part 14 Receiving part 15 Mounting base 16 Battery 17 Communication device 18 Computer equipment (calculation means)

Claims (5)

A buoy floated on the water surface, posture maintaining means for maintaining the buoy in a predetermined reference posture, a receiving fluid disposed in water, a tidal current transmission member connecting the buoy and the receiving fluid, An angle measuring means for measuring an inclination angle with respect to a reference attitude; and an arithmetic means for calculating a flow velocity of the tidal current based on the inclination angle with respect to the reference attitude of the buoy;
A buoy-type tidal current measuring device, wherein the buoy is inclined in the tidal direction from the reference posture in conjunction with a tidal current received by the receiving fluid.     The buoy-type tidal current measuring device according to claim 1, further comprising azimuth detecting means for detecting an inclination direction of the buoy.   The buoy-type tidal current measurement device according to claim 1, wherein the posture maintaining unit is configured by a measurement unit including the angle measurement unit incorporated in the buoy.   The buoy-type tidal current measurement device according to any one of claims 1 to 3, further comprising a frame body moored via a mooring line, wherein the buoy is rotatably held in the frame body. Using a buoy connected by a receiving fluid and a tidal current transmission member,
The buoy is floated on the water in a state where the receiving fluid is placed in water, the buoy is tilted in a tidal direction from a reference posture in conjunction with the tidal current received by the receiving fluid, and the tilt angle of the buoy is measured. A flow velocity measuring method, wherein the flow velocity of the tidal current is calculated based on an inclination angle of the buoy.

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