JPH11281758A - Buoy for measuring tsunami - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a buoy for measuring tsunami which can be improved in tsunami detecting ability without receiving any influence from waves. SOLUTION: In a buoy for measuring tsunami, a horizontal fin 23 is attached to the upper surface of a balance weight 22 fixed to the lower end (underwater) of a bar-like buoy main body 21 having buoyancy. Since the horizontal fin 23 functions as a resistance plate that stabilizes the buoy main body 21 in the vertical direction against ordinary waves, the influence of the ordinary waves on the main body 21 can be minimized. Since the fin 23 also functions as a detecting plate for efficiently grasping the movement of a water mass at a deeper portion of the bottom face of the main body 21 while having a certain degree of cross-sectional area against tsunami, the buoy can more easily grasp the wave height of tsunami and wave height detecting ability of the buoy for tsunami can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buoy for tsunami measurement which is floated on the sea to measure a tsunami and is used for tsunami prediction.

[0002]

2. Description of the Related Art A conventional buoy for tsunami measurement is shown in FIG.
As shown in (a), a rod-shaped member 2 is suspended from the lower center of a box-shaped main body 1 having buoyancy, and a balance weight 3 is fixed to a lower end (below the water surface) of the member 2 so that the main body 1 is It is configured to maintain a vertical position. Also in the main body 1,
A sensor for detecting a change in the vertical direction, that is, a change in the height of the wave, and a detection unit 4 including a transmitter for transmitting a signal indicating a change in the detected height are incorporated. Note that a rope body for mooring the main body 1 at a predetermined position is omitted.

As another buoy for tsunami measurement, as shown in FIG. 5B, a balance weight 12 is fixed to the lower end (below the water surface) of a buoyant rod-shaped buoy main body 11, and the buoy main body 11 is vertically mounted. It is configured to maintain a proper posture. At the upper end (on the water surface) of the buoy main body 11, a sensor for detecting a change in the vertical direction, that is, a change in wave height, and a detection unit 13 including a transmitter for transmitting a change signal of the detected height are provided. Built-in. Note that a cable body for mooring the buoy body 11 at a predetermined position is omitted.

[0004] With the above configuration, the main unit 1 or 11 moves up and down following the vertical fluctuation of the water surface by floating on the water surface.
A change in wave height is detected by 13 and a detection signal is transmitted.

[0005]

However, in the above-mentioned conventional buoy for tsunami measurement, when a wave is received, a change value of a water surface caused by the wave is multiplied by a cross-sectional area of the buoy main body 1 or 11 that cuts the water surface. There has been a problem that the amount of buoyancy changes and this force causes the buoy to move up and down. FIG. 5 (b)
The rod-shaped buoy body 11 shown in Fig. 1 is intended to reduce the effect by reducing the cross-sectional area that cuts the water surface, but if it is too small, the draft of the buoy itself changes greatly with a slight change in weight, The buoy may lack stability.

The vertical change in wave height due to a tsunami increases rapidly along the coast, but there is a problem that it is difficult to distinguish the wave from a wave at a position farther from the coast because the vertical change in wave height is small. .

Accordingly, an object of the present invention is to provide a tsunami measurement buoy which can improve the tsunami detection performance without being affected by waves.

[0008]

Means for Solving the Problems In order to achieve the above-mentioned object, an invention according to claim 1 of the present invention is a tsunami measuring buoy suspended on the sea for measuring a tsunami, at least comprising: One of the horizontal fins and the vertical fins is attached below the water surface.

With the above structure, the horizontal fin functions as a resistance plate for stabilizing the buoy body in the vertical direction against general waves, so that the influence of general waves can be minimized, and the fins can be protected against tsunami. On the other hand, it has a certain cross-sectional area and functions as a detection plate to efficiently capture the movement of the water mass in the deep part on the bottom of the buoy main body, making it easier to catch the tsunami wave height and detecting the tsunami wave height Performance can be improved. In addition, vertical fins function as detection plates to efficiently capture horizontal movements that are several tens of times larger than vertical movements against tsunamis. But
Tsunami can be measured.

[0010] The invention according to claim 2 provides the above-described claim 1.
The invention as described, wherein the horizontal fin and the vertical fin are provided with a buoy at a lower portion. With the above configuration, the influence of general waves can be further minimized, and the tsunami detection performance can be further improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Before describing the embodiments, the difference in the motion characteristics of a water body near the sea surface due to tsunami and general waves will be described.

In the case of a tsunami, as shown in FIG.
While the entire body of water A moves in a similar manner from the deep part to the part near the water surface, in the case of general waves, the movement of the water body B near the water surface is large, as shown in FIG. The movement becomes smaller as the water depth increases. That is,
In the case of a tsunami, it moves to a deeper body of water,
General waves tend to move only near the water surface. In addition, in the case of a tsunami, it is known that horizontal movement is several tens times larger than vertical movement. The present invention focuses on the difference between the motion characteristics of the water mass A during the tsunami and the motion characteristics of the water mass B during the general wave.

An embodiment of the present invention will be described below with reference to the drawings. [First Embodiment] FIG. 1 shows the structure of a tsunami measuring buoy according to a first embodiment of the present invention.

In FIG. 1, reference numeral 21 denotes a buoy-shaped rod-shaped buoy main body, and a balance weight 22 is fixed to a lower end (below the water surface) of the buoy main body 21 to maintain the posture of the buoy main body 21 vertically. Further, horizontal fins 23 are attached to the upper surface position (below the water surface) of the balance weight 22 of the buoy main body 21.

Further, a detector for detecting a change in the vertical direction, that is, a change in wave height, and a transmitter for transmitting a signal indicating a change in the detected height are provided at the upper end of the buoy main body 21.
25 built-in. Note that a cable body for mooring the buoy body 21 at a predetermined position is omitted.

With the above configuration, the vertical movement of the buoy main body 21 is detected by the detection unit 25 and transmitted. At this time, the horizontal fins 23 function as a resistance plate that stabilizes the buoy body 21 in the vertical direction against general waves, so that the influence of general waves can be minimized, and buoyancy due to waves can be reduced. Even if the cross-sectional area of the buoy main body 21 is reduced to prevent the influence of the buoy, the buoy stability can be ensured.
Further, the horizontal fins 23 function as a detection plate for efficiently capturing the movement of the water mass in a deep portion on the bottom surface of the buoy main body 21 while having a certain cross-sectional area with respect to the tsunami wave, The tsunami wave height can be easily captured, and the tsunami wave height detection performance can be improved. [Embodiment 2] FIG. 2 shows the structure of a tsunami measuring buoy according to Embodiment 2 of the present invention. The same components as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In the second embodiment, the balance weight of the buoy body 21 is replaced with the horizontal fin 23 of the first embodiment.
Four vertical fins 24 are attached to the upper surface position (under the water surface) of 22.

At the upper end of the buoy main body 1, a sensor for detecting a change in the vertical direction, that is, a change in the height of the wave, and a change in the horizontal direction, that is, a change in the horizontal movement of a deep water body are detected. A sensor and a detecting unit 26 including a transmitter for transmitting a detection signal of a change in the height of the detected wave and a change in the horizontal movement of the water mass are built in.

With the above configuration, the vertical movement of the buoy main body 21 is detected by the detecting section 26 and transmitted. Also,
The vertical fins 24 function as a detection plate for efficiently capturing a horizontal movement about several tens of times larger than the vertical movement of the tsunami wave.
Is detected by the detection unit 26 and transmitted.

Therefore, even when the buoy is installed at a distance from the coast and it is difficult to detect the tsunami only by vertical movement, the tsunami can be detected by the horizontal movement of the body of water in the deep place caused by the tsunami. Can be improved in detection performance. Third Embodiment FIG. 3 shows the structure of a tsunami measuring buoy according to a third embodiment of the present invention. The same components as those of the first and second embodiments are denoted by the same reference numerals, and description thereof is omitted.

The third embodiment is a combination of the first embodiment and the second embodiment. The horizontal fin is located on the upper surface (under the water surface) of the balance weight 22 of the buoy main body 21.
23, and four vertical fins 24 are mounted on the upper surface position (below the water surface) of the horizontal fins 23 of the buoy main body 21.

The detecting section 26 is provided at the upper end of the buoy main body 1.
Is built-in. With the above configuration, the vertical movement of the buoy main body 21 is detected by the detection unit 25 and transmitted.
At this time, the horizontal fins 23
Since it functions as a resistance plate that stabilizes the buoy body 21 in the vertical direction, the influence of general waves can be minimized, and even if the cross-sectional area of the buoy body 21 is reduced to prevent the influence of buoyancy due to waves, The buoy's stability can be ensured, and it also functions as a detection plate to efficiently capture the movement of the deep water mass on the bottom surface of the buoy main body 21 while having a certain cross-sectional area against tsunami Therefore, the tsunami wave height can be easily captured, and the tsunami wave height detection performance can be improved.

The vertical fins 24 function as a detection plate for efficiently capturing horizontal movements that are several tens of times larger than vertical movements in response to a tsunami. One horizontal movement is detected by the detection unit 26 and transmitted. Therefore, even when the buoy is installed far from the coast and it is difficult to detect the tsunami only by vertical movement, the tsunami can be detected by the horizontal movement of the body of water in the deep place due to the tsunami, and the tsunami detection performance Can be improved.

In the above embodiment, the buoy main body is a rod-shaped buoy main body 21, but as shown in FIG. 4, the buoy main body is a box-shaped main body 31, and this main body 31 is maintained in a vertical posture. The horizontal fins 23 and the vertical fins 24 may be attached to the member 33 for fixing the balance weight 32.

In the above embodiment, the horizontal fins 23
And the vertical fins 24 are attached to the lower part of the buoy at a deeper position below the water surface, that is, near the balance weight 32, but the same effect can be obtained if it is below the water surface.
However, a greater effect can be expected by attaching it to a lower portion (deep position).

[0026]

As described above, according to the present invention, the influence of general waves can be minimized, and the tsunami detection performance can be improved.

[Brief description of the drawings]

FIG. 1 is a side view and a plan view of a tsunami measurement buoy according to Embodiment 1 of the present invention.

FIG. 2 is a side view and a plan view of a tsunami measurement buoy according to a second embodiment of the present invention.

FIG. 3 is a side view and a plan view of a tsunami measuring buoy according to Embodiment 3 of the present invention.

FIG. 4 is a side view of a tsunami measurement buoy according to another embodiment of the present invention.

FIG. 5 is a side view of a conventional tsunami measurement buoy.

FIG. 6 is an explanatory diagram of a tsunami and a general wave.

[Explanation of symbols]

 21, 31 Buoy body 22, 32 Balance weight 23 Horizontal fin 24 Vertical fin 25, 26 Detector 33 Member

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Yukihiro Terada 1-7-89, Minamikohoku, Suminoe-ku, Osaka-shi, Osaka Inside Hitachi Zosen Corporation (72) Inventor Seiichi Maeda 1-chome, Minamikohoku, Suminoe-ku, Osaka-shi, Osaka 7-89 Hitachi Zosen Corporation

Claims (2)

[Claims] 1. A tsunami measurement buoy suspended on the sea for measuring a tsunami, wherein at least one of a horizontal fin and a vertical fin is provided.
A tsunami measurement buoy mounted below the water surface. 2. The buoy for tsunami measurement according to claim 1, wherein the horizontal fin and the vertical fin are provided below the buoy.