JPS622151B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an embankment unit and an embankment system for the purpose of amplifying wave height for wave power generation facilities installed on the coast. The present invention relates to a reflecting and converging levee for wave power generation, which is provided with an impermeable levee body that reflects and converges waves.

<Prior Art> The energy of waves hitting the coast is enormous, but currently, when this is to be used for power generation, only waves with a wave height of 1 to 2 meters or more can be used. on the other hand,
Normally, the height of waves that hit the coast is about 0.5 to 2.0 m, and when the sea is rough, wave heights of 2 m or more occur.

Therefore, at this stage, the amount of wave energy that can be used in wave power generation facilities installed on the coast is extremely small, and steady wave power generation is considered impossible.

On the other hand, during storms, waves of excessive wave height occur,
There was a possibility of damage to the power generation facility. Therefore, in this case, it was necessary to protect the power generation facility by blocking the waves, which caused problems such as the enormous cost of the facility. If waves with wave heights that are too small or too large are removed, the usable wave height range becomes extremely small, despite the enormous potential energy of waves.

Conventionally, a predetermined area of the ocean area is surrounded by an embankment body, and waves are made to enter from the opening of the embankment body on the offshore side, causing secondary vibrations in the seawater inside the embankment body to amplify the wave height.
Embankment units were used to protect power generation facilities from excessive wave heights during storms by making the openings smaller.

<Problems to be solved by the invention> However, the above-mentioned embankment unit has a fundamental problem that if the opening of the embankment is made small, only a part of the waves hitting the shore can be used.
There were practical problems, such as the cost of enclosing a vast ocean area with an embankment, and the fact that the offshore side of the ocean area was also deeper, so installing an embankment required a huge amount of money.

<Means for Solving the Problems> The present invention has been made based on the above-mentioned circumstances, and is based on the above-mentioned circumstances. A reflecting converging dam forming a transparent paraboloid is provided, and the wave height is amplified by the incident wave and the reflected wave or mutual overlap of the reflected waves at the focal point of the paraboloid. A permeable levee body is installed on the offshore side across the direction of wave incidence, allowing waves incident during normal times to pass through without resistance, and waves incident during storms to reduce excessive wave height and pass through the impermeable levee body. reach it. In addition, the permeable levee body promotes secondary vibration between the levee body and the impermeable levee body in response to incident waves during normal times,
It also selectively passes through the predominant period of the incident wave from offshore and blocks incident waves with a period that deviates from this. As a result, irregularities are less likely to intervene in overlapping waves and secondary vibrations, and the wave height amplification effect of incident waves and reflected waves can be greatly utilized. If a wave power generation device is installed at the focal point of the paraboloid, efficient power generation will be achieved.

<Example> Hereinafter, an example according to the present invention will be specifically described based on the attached drawings. Figures 1 and 2 are a plan view and an A-A sectional view showing the arrangement of the embankment body unit of the present invention. Paraboloid 2a
A reflective converging levee body 2 that forms a wave is installed, and a transparent levee body 1 having a filter effect is installed on the offshore side of the reflective converging levee body 2, crossing the wave incident direction. Furthermore, a wave power generation device 3 is installed at the focal point of the paraboloid 2a between the reflective converging levee body 2 and the transparent levee body 1. Here, the offshore wave of wavelength L enters the reflective converging levee body 2 as an incident wave through the transparent levee body 1 having a filter effect, and the reflective converging levee body 2
The reflected wave is reflected by the paraboloid 2a and concentrated at its focal point. As a result, overlapping waves are generated by the incident wave and the reflected wave, and the wave height is amplified near the focal point of the paraboloid 2a due to concentration of wave energy. By utilizing this vertical movement of the sea surface, it is possible to use wave energy more effectively than by using offshore waves as they are, and by installing the wave power generation device 3 at the focal point of the paraboloid 2a, it is possible to use the wave energy more effectively. It can convert wave energy into electrical energy. FIG. 2 shows the situation of overlapping waves according to the above explanation.

Here, the structure of the reflecting and converging levee body 2 is similar to the structures of breakwaters and seawalls conventionally installed on the coast, but depending on natural conditions, construction conditions, economic efficiency, social conditions, etc. It is possible to adopt a steel sheet pile embankment body, etc. Further, the relationship among the transparent embankment body 1, reflective convergence embankment body 2, and wave power generation device 3 according to the present invention is preferably installed as shown in FIG. 1, and this has been confirmed through experiments. That is, the center part 1a of the shore side surface of the transparent embankment body 1 is installed with a distance corresponding to the wavelength L on the offshore side from the center part 2b of the paraboloid 2a of the reflective convergent embankment body 2, and the wave power generation device is 3 is preferably installed at a point equidistant from the center 2b of the paraboloid 2a of the reflective convergent levee body 2 and the center 1a of the coastal side of the permeable levee body 1. The length is preferably twice the wavelength L of the offshore waves.

In addition, in order to reduce the cost of the entire power generation facility, it is desirable to make the water depth shallow and use a simple structure such as a steel sheet pile levee body as a reflective convergence levee body 2, but it is necessary to secure a quiet and hidden sea area and preserve the hinterland. In multi-purpose use, the structural type and cost of the reflective converging levee body 2 can be considered from a different perspective, so that the cost of the reflective converging levee body can be minimized in the total cost of the power generation facility, and power generation costs can be kept low. can.

On the other hand, the permeable embankment body 1 has low resistance to waves with a predominant period, but on the other hand, it is not necessarily applicable because it needs to have a strong structure due to the wave height phenomenon during stormy winds. As shown in FIG. 2, a horizontal plate embankment having horizontal plates mainly above the mean sea level can also be considered as an example.

Figures 3 and 4 show an embodiment in which reflective convergence levees of the present invention are installed continuously parallel to the coastline to increase power generation capacity and to be used for multiple purposes such as securing a calm sea area and protecting the hinterland. . In other words, the wave energy ranges from several kilowatts to several tens of kilowatts per meter.
Kilowatts (KW), where:
The current conversion efficiency to electrical energy is 0.1~
Assuming a power output of about 0.3, if installed 1 km along the coastline, an output of 500 to 5000 KW can be obtained, and if installed 10 km, an output of 5000 to 50000 KW can be obtained.

<Effects of the Invention> As explained in detail above, the present invention maximizes the energy of waves hitting the coast by using the above-mentioned combination of a transparent embankment body, a reflective convergence embankment body, and a wave power generation device. The purpose of this project is to provide a wave power generation facility with a simple structure that can be used for limited use. Therefore, the above-mentioned wave power generation facilities can be economically constructed, greatly contributing to pollution-free and resource-free power generation, and promoting coastal development such as securing calm sea areas and multipurpose use of the hinterland.
This has the remarkable effect of contributing to the construction industry.

[Brief explanation of the drawing]

FIG. 1 is a plan layout diagram of an embankment unit according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIGS. It is a top view of continuous arrangement. DESCRIPTION OF SYMBOLS 1... Permeable embankment body, 1a... Center part of the coast side of the permeable embankment body, 2... Reflective convergence embankment body, 2a... Paraboloid, 2b... Center part of the paraboloid, 3... Wave power generation device.

Claims (1)

[Claims] 1. It is installed on the sea side of the coast, and an impermeable paraboloid is formed on the offshore side in the direction of wave incidence, and the reflected waves are reflected at the focal point of the paraboloid. a reflective convergent levee body; a transparent levee body installed on the offshore side of the reflective convergent levee body across the wave incident direction and that transmits incident waves; the reflective convergent levee body and the transparent levee body A reflector for wave power generation characterized by comprising a wave power generation device installed at a focal point of the paraboloid between the two and whose wave height at the focal point is amplified by the overlap of the reflected wave and the incident wave. Convergence levee. 2. Claims characterized in that the center of the shore side surface of the transparent levee body is installed with a distance corresponding to the wavelength of offshore waves from the center of the paraboloid of the reflective convergence levee body. Reflection convergence for wave power generation as described in item 1. 3. The above-mentioned wave power generation device is installed at a point equidistant from the center of the paraboloid of the reflective convergent dam and the center of the coastal side of the permeable dam. A reflecting convergence dam for wave power generation according to scope 1.