JP3015535B2 - Multipurpose coastal breakwater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a multipurpose coastal breakwater.

[0002]

2. Description of the Related Art Conventionally, embankments constructed on the shore have a main purpose of preventing intrusion of waves, as they are called breakwaters or seawalls.

[0003]

However, attempts have been made to use the site on the river embankment for roads, parks, etc. However, some breakwaters, which are coastal embankments, are also used as expressways. It has the problem that it is still underutilized to the extent that it is proposed.

Accordingly, the present invention has been made to solve the above-mentioned problems, and it is needless to say that the conventional tide protection and the shared use with roads are of course.
It is an object of the present invention to provide a multipurpose coastal breakwater that converts wave energy into pumped energy and uses the pumped seawater for various purposes such as power generation, aquaculture, and a leisure pool.

[0005]

In order to solve the above-mentioned problems, according to the present invention, in order to solve the above-mentioned problems, the width is gradually reduced from the shoreline L toward the land. A pumping channel 3 is constructed by a pair of standing wall portions 1 and 1 and a bottom portion 2 which is gradually raised from the shoreline L toward the land side, and a side portion of the pumping channel 3 is surrounded by the standing wall portion 1. Pond 5
This is a technical measure in which the pumping reservoir units 10 provided with are arranged side by side continuously along the shoreline L.

[0006]

Therefore, according to the present invention, when a wave rushing to the land is sent to the pumping channel 3, the wave height increases as the flow path width gradually narrows, and the wave energy increases because the bottom portion 2 is gradually increased. Pumping seawater, the pumped seawater has the effect of climbing over the standing wall 1 and overflowing the pond 5 beside the pumping channel 3.

[0007] Since the water level of the seawater accumulated in the pond 5 is higher than the normal sea level, the wave energy is converted into the potential energy of the seawater in the pond 5.

The pond 5 can store a certain amount of seawater, and the wave energy is an intermittent energy, whereas the seawater stored in the pond 5 has a function of storing a certain amount of potential energy. become.

[0009]

Next, an embodiment of the present invention will be described with reference to the accompanying drawings.

In the figure, S is the sea, L is the shoreline, and A is the land. The present invention provides a pumping channel with a pair of upright walls 1 and 1 having a width gradually decreasing from the shoreline L toward the land A side and a bottom surface portion 2 gradually rising toward the land A side from the shoreline. 3
To build.

The pumping channel 3 determines the maximum width, the ratio of the maximum width to the minimum width (stenosis rate), the total length, and the height difference based on the average wave height. The wider the maximum width of the pumping passage 3 is, the more wave energy can be converted into higher potential energy. This is particularly advantageous for power generation. The area per one becomes too large and is not always practical.
Therefore, in order to set the maximum width of the pumping channel 3 large, it is desirable to use a natural terrain curved so that the shoreline is depressed toward the land side as the pre-pumping channel. In other words, the wave energy is concentrated on the natural terrain. It is desirable to install the multipurpose coastal breakwater of the present invention in a place.

When the maximum width of the pumping flow path 3 is determined, a normal amount of seawater (wave energy) flowing into the pumping flow path 3 is obtained, so that the most efficient pumping flow path corresponding to the wave energy is obtained. The stenosis rate, the overall length, and the height difference may be selected.

The pumping flow path 3 has the width shown in FIG. 3 as an example.
In the example, the shoreline L side narrows its width relatively steeply, and gradually narrows the width from the middle, and the bottom surface 2 also slopes the steep shoreline L side relatively steeply, and gradually decreases the slope from the middle. It is. The difference is that the pumping flow path 3 initially assumed the shape of FIG. 3 assuming that the wave energy was sequentially concentrated (accumulated) as the wave progressed to the land A side, and the water level was gradually increased. Assuming that the shape of the pumping channel 3 is as shown in FIG. 3, a phenomenon in which seawater jumps up in a fountain shape at the land A side end (seawater inflow terminal side) of the pumping channel 3 is recognized. Although it is beneficial to actively use the fountain-like pumping action, if only this fountain-like pumping action is used, most of the seawater will not be guided to the pond 5 but will again pass through the pumping channel 3 when the waves draw. There was a tendency to return, and although seawater could be pumped to a high position, a large amount of water could not be obtained.

Compared with the above, the method of changing the rate of narrowing the width of the pumping channel 3 in the middle of the example shown in FIG. 1 so as to reduce the inclination of the bottom 2 is based on the seawater inflow starting end side of the pumping channel 3. The water energy is concentrated and the water level is raised, and the seawater gradually climbs over the standing wall 1 in a relatively long flow path at the end of the seawater inflow, and the pond 5
Since the water overflows to the side, a large amount of pumped water can be obtained.

The pumping channel 3 is provided on the upright wall portions 1, 1 thereof.
The bottom and the bottom portion 2 are usually constructed of concrete, but other conventionally known embankment techniques may be used as long as the conditions of being hardly eroded by waves and having few uneven surfaces are met.

On the side of the pumping channel 3, a pond 5 surrounded by the vertical wall 1 is provided to constitute a pumping tank unit 10.

As shown in FIG. 1, the pond 5 is usually provided on both sides of the pumping channel 3, but may be provided only on one of the left and right sides of the pumping channel 3. The standing wall 1 forming the pond 5 stores the potential energy of seawater by setting it higher than the seawater surface. The standing wall 1 does not have to surround the pond 5 on all sides,
If the land A is sufficiently higher than the sea level, it can be omitted. Further, the pond 5 may not be surrounded by only the standing wall portion 1 as shown in FIG. 3, but may be interposed on the shoreline L side with the embankment portion 4 along the shoreline L as shown in FIG. 1. is there.

The present invention relates to the above-described pumping reservoir unit 10.
Are continuously juxtaposed along the shoreline L.

The purpose of continuously arranging the above-mentioned pumping basin units 10 is firstly to have a function as a breakwater. Another purpose is to make each pumping basin unit 10 have a storage capacity. This is to prevent the usage range from being limited due to a small capacity because 500 to 5000 m ³ is assumed. For example, in the case of generating power from pumped seawater, if the capacity is small, continuous power generation for a long time is impossible, and even if the capacity of one pumping reservoir unit 10 is small, the capacity can be increased by connecting many of these. It can be set as desired.

Although not shown in the example of FIG. 1, the connection of the respective pumping pond units 10 can be easily realized by connecting the respective ponds 5 with communication pipes. 5 is provided with a connection pond 5a on the land A side. Although not clearly shown in the figure, the bottom of the connecting pond 5a is set to be lower than the height of the seawater intrusion terminal of the pumping channel 3, and the shallow bottom of each pond 5 is also the seawater intrusion terminal of the pumping channel 3. Is set lower than the height.

Next, a specific example of the use of the multipurpose coastal breakwater of the present invention will be described. First, according to the present invention, since the pond 5 surrounded by the standing wall 1 is continuously provided along the shoreline L, the standing wall 1 functions as a breakwater, and the standing wall 1 which is a construction of the pond 5 is provided. Roads can be laid in the same way as conventional breakwaters.

As another usage, wave power generation can be assumed. Since the wave energy can be converted into the potential energy of seawater, the potential energy of the seawater can be obtained by guiding the seawater to the generator 6 from the water pipe 6a and discharging it to the sea S by operating the generator 6 by the potential energy of the seawater. Become. Pumping capacity varies depending on the installation location (average wave height), but is 2 to 4
m is feasible and the power generation capacity is 300
Although it is not so large as KW / h, it has sufficient practicality since continuous power generation is possible with the conventionally known generator 6.

As another method of use, aquaculture of marine organisms can be envisaged. The advantage of the multi-purpose coastal breakwater of the present invention as this utilization method is that fresh seawater is constantly supplied and that the ponds 5 can be used separately. The constant supply of fresh seawater will, of course, provide fresh seawater, prevent pollution from marine habitats, and ensure an oxygen supply, providing just the right conditions for aquaculture of marine life. Is what you can do. In addition, each pond 5
Can be used for aquaculture of a plurality of species, cultivation according to the growing condition, breeding of food, and the like in a close place, thereby enabling efficient aquaculture.

Further, as another usage, it can be used as a seawater pool or a marine aquarium. Since the use as a seawater pool is constantly supplied with fresh seawater as described above, water quality management can be greatly simplified if it is not necessary to use no sterilizer / purifier at all. In addition, utilization as a marine aquarium is just as convenient for breeding living things as in the above-mentioned aquaculture. Seawater pools require additional equipment such as safety devices, while marine aquariums require additional equipment such as transparent underwater passages.However, even if these additional equipment are laid, considering the labor and costs required for water management, It will be sufficiently efficient.

[0025]

As described above, the present invention provides a multipurpose coastal breakwater which can be used for multiple purposes as described above, and whose structure is somewhat complicated as compared with ordinary breakwaters, but which can be economically sufficiently used depending on the method of use. Can be done.

In particular, the present invention provides a multipurpose coastal breakwater which can provide an effective power generation system on remote islands where hydroelectric power cannot be expected, and which can contribute to the fishing and leisure industries which are the most advantageous industries for remote islands. Can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a multipurpose coastal breakwater of the present invention.

FIG. 2 is a sectional view taken along line AA.

FIG. 3 is a plan view showing an embodiment.

Claims (1)

(57) [Claims] 1. A pair of upright walls (1, 1), each of which gradually decreases in width from the shoreline (L) toward the land (A), and a state of ascending from the shoreline (L) toward the land (A). A pumping channel (3) is constructed with the bottom surface portion 2 and a pond (5) surrounded by the vertical wall (1) is provided on a side of the pumping channel (3). 10) A multipurpose coastal breakwater which is continuously juxtaposed along a shoreline (L).