JPS6393918A - Sea area-control structure with permeable horizontal plate - Google Patents

Abstract

PURPOSE:To maintain natural landscope as well as raise the breaking effect of waves by a method in which the inside of a box-like marine breakwater structure is divided into a few retarding compartments, slits through which sea water passes are formed in walls, and slits through which sea water blows out are formed in the upper flat plates. CONSTITUTION:A marine breakwater structure 8 is provided with a square bottom wall 1, vertical walls 2-5 surrounding the bottom wall 1, and a permeable horizontal plate 7 positioned below the sea surface 6. The bottom wall 1 is set on the seabed 9 and the front wall 2 of the structure 8 is partitioned by a partition wall 10 from the back wall 4 to form retarding compartment 11 and 12 and large numbers of slits through which sea water passes are formed horizontally in the walls 2, 10, and 4. A large number of slits 17 through which sea water in the compartments 11 and 12 blows out in the form of vertical jet stream 16 are formed in the plate 7. Incoming waves passing through the plate 7 collide with the vertical jet stream 16, thereby breaking and damping the waves 18.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a sea area 11111 structure with a transparent horizontal plate that is installed offshore of a beach to control huge waves and create a calm sea area. It is.

(Prior Art) As a structure of this type, there is an offshore breakwater that is constructed by stacking concrete blocks and has both a beach effect and a certain degree of breakwater effect.

(Problems to be Solved by the Invention) However, the detached breakwater has a large cross section in deep water, which not only causes economical problems, but also makes it impossible to expect the desired effects. Therefore, there is a problem that the usable water area behind the breakwater is limited. Furthermore, since the detached levee protrudes on the south side, there is not only a risk of spoiling the scenery, but also the problem that the detached levee is likely to collapse due to scouring in front of the detached levee.

The purpose of the present invention is to create a sea area with slits that can sufficiently obtain the ura wave effect, create a calm sea area, and do not spoil the scenery.
11 II! The goal is to provide 9 interlocking groove structures.

(Means for Solving the Problems) To achieve the above object, the sea area with transparent horizontal plate υI ali (A interlocking)
1711, and a box-shaped wave-dissipating underwater structure that is installed in the sea and has four vertical peripheral walls and a transparent horizontal plate that is located below the sea surface. The inside of the main body is partitioned into a renovated water play chamber by a vertical partition wall between the front wall and the rear wall, and each of the front wall, the partition wall, and the rear wall has a large number of slits through which seawater passes. li+) in the water retarding chamber, and on the transparent horizontal plate,
The structure is characterized by a large number of slits that eject seawater as vertical jets.

(Function) With this structure, the incident wave is introduced into the water retardation chamber through the slit and is disturbed within the water retardation chamber.

A part of the incident wave that enters the water retarding chamber is ejected as a vertical jet from the slit in the transparent horizontal plate.

The vertical jet from the slit of the transparent horizontal plate collides with the incident wave that is passing over the transparent horizontal plate, breaking the incident wave,
It's about to disappear. Further, the remaining inlet/first wave that entered the water supply V is reduced in the water retarding chamber and discharged from the slit in the rear wall.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings. 1 to 4 show a first embodiment of the present invention.

As shown in the figure, the sea area control structure with transparent horizontal plates of this embodiment has a rectangular bottom wall 1, four vertical walls 2.3, 4.5 surrounding the bottom wall 1, and sea surface A box-shaped wave-dissipating underwater structure main body 8 is provided, which is installed in the sea and has a transparent horizontal plate 7 located at a height below 6. In this embodiment, the bottom wall 1 is installed on the seabed surface 9. The inside of the wave-dissipating underwater structure main body 8 is partitioned into a plurality of water-permeable chambers 11 and 12 by a vertical partition wall 10 that partitions the front wall 2 and the rear wall 4 thereof. A large number of horizontal slits 13, 14, 15 through which seawater passes are formed in the front wall 2, the partition wall '10, and the rear wall 4, respectively.

In addition, a large number of slits 17 are formed in the ceiling wall 7 through which the seawater in the water retarding chamber 11.12 is spouted out as a vertical jet stream 16. In this case, each opening ratio (ratio of slits to plate area) εl of the front wall 2, partition @ 10, and rear wall 4, and the opening ratio ε2 of the ceiling wall 7 are ε! 〉ε2.

The wave-dissipating effect of such structures can be determined from the results of hydraulic model experiments. The ratio d/h of the submersion depth from the still water surface to the water depth is between 0 and 0°2 (c) The aperture ratio ε11ε2 is ε1-25 to 30% and ε2 = 15 to 18%, respectively (2) Structure This becomes remarkable when the ratio B/L of the main body width B to the wavelength is between 0.1 and 0.2.

Figure 5 shows the results of the hydraulic model experiment. The horizontal axis of the figure is made dimensionless by the ratio of the structure body width B to the wavelength of 8/L, and the vertical axis is Kt, which is the wave height transmissibility (transmitted wave 1 relative to the wave height of the incident wave 18).
9), Kr is the reflectance (ratio of the wave height of the reflected wave to the wave height of the incident wave 18), and K2 is the energy loss rate.

The triangle marks, circles, and squares in the figure represent the transmissibility, respectively.
The anti-PA rate and the energy loss rate are shown in the graph and the black marks are ε1-30%, ε2-18% and ε1-, respectively.
26% and ε2-18%.

From this result, the transmittance Kt is 0.6 or less, and the reflectance 1<r
is less than 0.3, and 2 is more than 0°5 for the energy loss rate.
It can be seen that the wave dissipation effect is high.

The resistance of this structure to sliding and overturning due to wave force is as follows:
As shown in FIG. 6, a filling sand storage chamber 18 is provided under the structure body 8, or as shown in FIG. By doing this, you can make the most of your abilities.

In addition, if the scour is significant, the pile 19 should be removed as shown in Figure 8.
The structure main body 8 may be raised using f.

(Effects of the Invention) As explained above, in the present invention, a large number of slits are provided in the front wall, the partition wall, and the rear wall of the wave-dissipating underwater structure main body, and a plurality of retarding water are provided inside the structure main body by the partition walls. Since a chamber is formed and a slit is also provided in the transparent horizontal plate, the incident wave passes through the slit into the water retarding chamber and is disturbed, and then is emitted as a vertical jet from the slit in the transparent horizontal plate.

Therefore, the vertical jet collides with the incident wave passing above the transparent horizontal plate to break the incident wave and cause the wave to be reduced. Therefore, a wave-dissipating effect can be reliably obtained, and a calm sea area can be created on the beach. In addition, since a part of the incident wave passes through the slit, there is an advantage that water permeability between the oil side and the shore side is good and the flow condition is not obstructed, and it is also effective in preventing coastal erosion. Furthermore, according to the present invention, since an aeration effect can be expected, it can also be used as a fish reef.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a forest section in use of an embodiment of the structure according to the present invention, and Figs. 2 to 4 are a perspective view, a front view, and a plan view of f331 (parts of which are not shown in Fig. 1). Figure 5 is a distribution diagram of measured data of wave height transmissivity, reflectance, and energy loss rate depending on the ratio of body width to wavelength obtained by hydraulic model experiments of the structure of this example, and Figures 6 to 8 Figure 3 is a plane view showing three other embodiments of the present invention; 1...Bottom wall, 2...Front wall, 4...Rear wall, 6...
...Sea surface, 7.--Transparent horizontal plate, 8.. Wave-dissipating underwater structure body, 10.. Partition wall, 11.12-.. Reservoir.
13-15...Slit, 1G-...Vertical jet, 17
···slit.

Claims (2)

[Claims] (1) A box-shaped wave-dissipating underwater structure that is installed underwater and has a bottom wall, four vertical walls that surround the bottom wall, and a transparent horizontal plate that is located below the sea surface. The wave-dissipating underwater structure main body is partitioned into a plurality of water retarding chambers by a vertical partition wall that partitions the front wall and the rear wall, the front wall, the partition wall, and the rear wall. A sea area control with a permeable horizontal plate, characterized in that a large number of slits are formed in each of the permeable horizontal plates to allow seawater to pass therethrough, and a large number of slits are formed in the permeable horizontal plate to eject the seawater in the water retarding chamber as a vertical jet. Structure. (2) The aperture ratio of the slit of the transparent horizontal plate is
The sea area control structure with a transparent horizontal plate according to claim 1, wherein the opening ratio is determined to be smaller than each opening ratio of the slits of the front wall, the partition wall, and the rear wall.