JPS58214678A - Collective device of wave energy - Google Patents

Abstract

PURPOSE:To improve collective efficiency of wave energy, by arranging a collecting part of the wave energy to an area, in which reflected waves are concentrated, in an incident surface of the wave. CONSTITUTION:In protecting sea walls 23, 23' having recessed curve shaped reflective surfaces 23a, 23'a, reflected waves are concentrated to focuses 35 on the surface of the sea in the vicinity of the center in a small bay formed by said surfaces 23a, 23'a and height of the wave is amplified. Then a collecting part of wave energy is arranged to the focus 35 in this way, collective efficiency of the wave energy can be remarkably increased.

Description

[Detailed Description of the Invention] When attempting to recover the energy of waves on the coast,
If the coast or coastline remains in its original shape, wave heights are often low, and wave energy recovery efficiency is usually extremely low, and attempts to recover energy are often forced to be abandoned when sea conditions are calm.

This phenomenon occurs because only a portion of the wave energy is extracted along the coastline.

1 to 6 show a conventional wave energy recovery device.

Figure 1 shows an example of a breakwater built inside and outside a port.
A breakwater (3) made of concrete blocks is constructed on a rubble mound (2) provided on the seabed 11). (4) in the figure is the sea level line.

Figure 2 also shows an example of a breakwater built to protect the land shore inside and outside a port. Wave-dissipating concrete blocks (6
) is enclosed or masonry.

Figure 3 shows a conventional wave energy recovery device for the construction of breakwaters and breakwaters on land facing the ocean surface. (8) is anchored to the seabed via (
9) is the wave power generation equipment installed on board the previous ship, 00)
is an undersea capeple for transmitting electrical power to land (1
Reference numeral 11 indicates a land-based building used for utilizing electrical power generation or for transforming and distributing electricity.

Furthermore, as other wave energy recovery devices, floating body 02I and the tower-like structure (13 is installed in Figure 0) that prepares the foundation for fixing to the seabed against the vertical movement of floating body 02I and the same floating body (121). (14) is a bulk transmission line that sends the electric power obtained by the device to land, f151 is a transmission line tower, and (10 is a land line used for generating electricity for the first purpose or for transforming and distributing electricity. ” It is a two-construct.

In the above-mentioned conventional wave energy recovery device (as shown in Part 41), the energy of the waves pushing in from offshore is absorbed by the length B along the wavelength net (the energy li of the wave energy recovery device = !l collection effective width) ), but in this case, the wave height h is also that of the wave that crashes naturally at the point 1c, and at that point, the recovery target and t The wave energy is determined by the above-mentioned λ and h.

The wave energy recovery device is a conventional type of coastal embankment,
It is installed and used under a breakwater structure, and therefore the sea surface at the wave energy recovery point has the same wavelength and wave height as the sea surface in the vicinity, and the energy of waves generated on this sea surface is the target of recovery. .

In other words, t1'1 of the wide-area sea conditions in the coastal waters and bay waters.
Wave energy possessed by the entire surface of the ocean is the object of recovery, and if the sea conditions are calm over a wide area, the efficiency of wave energy recovery will be significantly reduced, or recovery will become impossible.

That is, if the total energy contained within one wave length, width B, and water depth H is E, then E-1 ρ9Bh λ 16 W where ρ: Density of water g: Acceleration of gravity h: Wave height λ: Wavelength H: If we average the water depth and the wave height in a wide area around the wave energy recovery device, wave energy proportional to h λ will be recovered on average.

In other words, the wave energy distributed on the sea surface will be extracted locally as it is, and the extraction efficiency in this case will depend entirely on the density of the wave energy distribution as it is. It is difficult to raise the level.

The present invention was proposed in order to solve such problems, and it forms a reflection surface for waves that intrude inland on the coast, and provides a reflection surface at a location where the waves reflected from the reflection surface are concentrated. The present invention relates to a wave energy recovery device characterized in that a wave energy recovery section is provided.

As described above, in the present invention, a reflecting surface for waves that intrude inland on the coast is formed, and a wave energy recovery section is disposed at a location where the reflected waves of the waves on the reflecting surface are concentrated. This will improve the collection efficiency of
Further, due to the synchronization of the reflected waves concentrating on the wave energy recovery section, wave heights are superimposed, a phenomenon of wave height amplification occurs, and the wave energy recovery efficiency is significantly improved.

The present invention will be described below with reference to the illustrated embodiments.

In Figure 5, the rubble mound Sogami constructed on the seabed (2I) has a reflective surface (having a circular arc or parapetal line where the shoreline on the sea side indents inland, or a concave curved surface similar to these). 23α] has been constructed, and the vertical section of the surface in contact with the seawater is mostly a straight line that is close to vertical, or a curved line. Middle (2i) is a concrete tie beam, f251 is a promenade, and C26+ is the sea surface.0 Figure 6 shows the reflective surface (23 A steel protective light (23′α) with a reflective surface (23′α) of the same structure as
23'), and in the figure (2η is the inner strength member for reinforcing and stiffening the same steel protection embankment (23'), (28j
is a cylindrical member for penetrating concrete or steel pilings 1) for use in anchoring the haze barrier. In the figure, parts equivalent to those of the above embodiment are given the same reference numerals.

FIG. 7 shows the state when waves are incident from offshore toward the protective light C231 (23')K, for example, the broken line (30+
The wave on the incident side, denoted by l, is the protective light C2:'J (23
' ) Concave curved reflective surface at K (23α) (23'α)
After being reflected at point A above, it proceeds along the path shown by the solid line (31). In other words, waves on the sea surface also have the general properties of wave motion, and have reflective characteristics according to Snell's law, so the reflecting surface (23α) (23') In the case of a reflective surface, the wave incident from the axis (321 direction) (1 wave is reflected by the reflective surface and then concentrated at its focal point (2:1).Therefore, superimposition of wave heights occurs here, and the wave height is amplified. Ru.

Further, the arcuate reflective surface (23α) (23'
In the case of (Z), the envelope of the wave reflection direction produces a cuspid-like concentration, which is somewhat different from the case of the year point of the floating object reflecting surface, but (
In the vicinity of the f region shown at 34°, the concentration of arrow-shaped reflection direction lines is extremely high.

Figure 8 shows the reflective surface (
23α) (23'α), the concentration points (33') (34') of the reflection direction lines are conceptually shown when waves are incident from a direction different from that in Figure 7. The object reflecting surface (23α) (23
In the case of 'α), the focus is (33') from G3) in Figure 7A.
Move to.

Also, the arcuate reflective surface (23α) (23'd) shown in Figure 8B
In the case of , the envelope position and shape of the reflection direction line move, and the seventh
Area S4: in figure B moves to (34').

Furthermore, the waves that hit the coast now have crest lines that are almost parallel to the shoreline, and it is safe to assume that their direction of travel remains almost the same throughout the year, except during periods of temporary strong winds. Therefore, by installing the axes t31+ of the concavely curved reflecting surfaces (23α) (23'α) to be oriented in a direction substantially perpendicular to the mean line of the coast, it is possible to control the incident wave. After 100 seconds of reflection, it is concentrated at a concentration point t3m corresponding to the stretch point 23+(2
A standing wave is generated as a result of interference between the incoming wave and the reflected wave inside the curved surface (23α) (23'a) formed in a small curved shape such as 3'). Therefore, the breakwater (
The reflecting surface (23α) (23'α) of 231 (23') is set at an appropriate distance from the wave concentration point (and the concentration point 0
It is possible to increase the frequency at which 9 becomes the abdomen of the standing wave.

Therefore, as shown in FIG.
3α) (23'α]) (231 (23N), which concentrates the reflected waves at the concentration point (:) on the sea surface near the center of the small bay formed by the same reflecting surface and amplifies the wave field. Therefore, the same concentration point (, (51
By disposing a wave energy recovery section in the wave energy recovery section, the wave energy recovery efficiency can be significantly increased.

A simple experiment shows that the wave height amplification factor of the five-piece device can reach several times the order of magnitude. Therefore, since the wave energy at the concentration point (351) is smaller than that in the case of a conventional breakwater, the energy amplification degree will be -2, 3, and 4, respectively, 4.9.16 times. Therefore, the operating time rate for wave energy recovery, which has been extremely low in the past, can be significantly increased, and this is considered to be extremely effective in terms of wave energy recovery.

Furthermore, by drawing wave energy close to the coast and amplifying it, the structure of the generator and the countermeasures for power transmission lines are no different from those on land, making it easier to install wave energy generators far offshore. This is a significant advantage.

Although the present invention has been described above with reference to embodiments, the present invention is, of course, not limited to these embodiments, and can be modified in various ways without departing from the spirit of the present invention. 0

[Brief explanation of drawings]

Figures 1 and 2 are slope views of a conventional protection embankment, Figure 6 is a slope view of a conventional wave energy recovery device, Figure 4 is an explanatory diagram of wave energy, and Figures 5 and 6 are The '1'' slope view, Figures 7A and 7B, and Figures 8A and 8B respectively show embodiments of the protection levee applied to the wave energy recovery device according to the present invention. FIG. 9 is an explanatory diagram showing the state of wave reflection in the present invention, FIG. 9 is an explanatory diagram of the operation of the main parts of the wave energy recovery device according to the present invention, and FIG. 10 is an illustration showing an embodiment of the wave energy recovery device according to the present invention. This is a slope diagram.
'α)-m-reflection surface 0 Sub-agent Patent attorney Okamoto important literature and 2 persons off 8 V spear 7515 O 8 A figure 88 figure

Claims (1)

[Claims] A wave energy recovery device comprising: forming a reflecting surface for waves intruding inland on the coast; and arranging a wave energy recovery section at a location where reflected waves of the waves from the reflecting surface are concentrated. .