JP3294028B2 - Low reflection type floating breakwater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floating breakwater installed in a harbor or the like for reducing waves (incident waves) entering from the open sea, and in particular, to reduce reflected waves accompanying incoming waves. Thus, the present invention relates to a low-reflection floating breakwater.

[0002]

2. Description of the Related Art There are conventional floating breakwaters as shown in FIG. 7 (plan view) and FIG. 8 (cross-sectional view). Are arranged at a right angle to, so that the incident wave 02 is prevented by the bank body 01 and the transmitted wave 03 is reduced. The embankment body 01 is moored to the seabed by a mooring line (not shown) attached to a sinker (not shown) installed on the seabed.

[0003]

By the way, in the above-mentioned conventional floating breakwater, a reflected wave 04 is generated from the embankment body 01 with the arrival of the incident wave 02, and the reflected wave 04 is transmitted to the subsequent incident wave. There is a problem that the sea surface becomes significantly disturbed due to interference with the 02 and adversely affects small vessels such as fishing boats sailing in the vicinity.

[0004] As a result, the sea area where the floating breakwater is installed is limited, which is a factor that prevents the floating breakwater from being widely used as a wave-breaking structure. The present invention absorbs the energy of the incident wave so as to reduce the reflected wave from the embankment as described above, and prevents the adverse effect on small boats sailing in the vicinity. The purpose is to provide a breakwater.

[0005]

In order to achieve the above-mentioned object, a low-reflection type floating breakwater of the present invention is a floating type breakwater, which is a main levee body as a floating body having mooring means to a water bottom. A plurality of guide plates are provided at the front edge of the main embankment at intervals from each other, and the upper end surface of the guide plate is higher than the sea surface.
The guide plate protrudes upward and the lower end of the guide plate is
Measure the dimension in the depth direction to a position near the bottom of the embankment.
In addition , an end plate is attached to a front end portion of each of the guide plates so as to form an interval between adjacent end plates.

A reflector having a triangular cross section is attached to the front edge of the main bank in a region sandwiched between the guide plates so as to protrude outward from the chevron. It is characterized by:

Further, the invention is characterized in that a number of small holes are formed in each of the guide plates.

Further, on both surfaces of each of the guide plates,
A reticulated structure is attached.

[0009]

In the above-described low-reflection floating breakwater of the present invention, the waves that have entered the area surrounded by the plurality of guide plates attached to the front edge of the main levee are in front of the main levee. After colliding with the edge and reflected, it collides with the following incoming wave and is reflected again, and further collides with the front edge of the main embankment and is reflected. At this time, the end plate functions to prevent leakage (reflected waves) from the region to the outside of the wave, and induces a part of the flow in the region downward.
Lead . Further , a reflector having a triangular cross section acts to change the direction of wave reflection in the above-mentioned region, and furthermore, a number of small holes formed in each guide plate or a net-like structure attached to both surfaces of each guide plate. Acts to break the waves reflected by the reflector.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a low-reflection floating breakwater according to a first embodiment of the present invention; FIG. A of 1
It is arrow A sectional drawing.

3 to 5 show a low-reflection type floating breakwater as a second embodiment. FIG. 3 is a plan view of the breakwater, and FIG.
FIG. 5 is a cross-sectional view taken along arrow B, and FIG. FIG. 6 is an enlarged plan view of a main part of a low reflection type floating breakwater as a third embodiment.

First, a first embodiment will be described. 1 and 2, reference numeral 1 denotes a main levee body composed of a substantially rectangular floating body in plan view, and the main levee body 1 is a mooring cable (not shown) mounted on a sinker (not shown) installed on the sea floor. (Not shown) and is moored to the sea floor.

The main embankment body 1 is disposed so that its long side is perpendicular to the incident direction of the incident wave 5 incident in the wave direction 2 and has a plurality of front edges 1 a facing the incident wave 5. The guide plates 6 are provided at equal intervals to protrude in a direction orthogonal to the front edge 1a. Reference symbol S indicates a region sandwiched between adjacent guide plates 6. The intervals between the guide plates 6 may not be equal.

Each guide plate 6 has an upper end surface projecting above the sea surface W and a lower end portion having a dimension in a depth direction reaching a position almost close to the bottom surface of the main levee body 1, and has a front end surface (incidence). An end plate 8 having substantially the same depth dimension as the guide plate 6 is provided on the surface facing the wave 2).
Are formed with a gap between them.

With the above-described configuration, in the low-reflection type floating breakwater of the first embodiment, the incident wave 5 entering the floating breakwater in the wave direction 2 is in the region S sandwiched by the guide plate 6. To enter. The incoming wave collides with the front end 1a of the main levee body 1 and is reflected and changed its traveling direction. Then, it collides with the subsequently entering incident wave 5 and its traveling direction is changed again. The reflection is repeated in the region S.

As described above, the wave is disturbed while the reflection is repeated, and the energy of the wave is converted into sound, heat, etc., and is consumed.
Dissipated. And this time, the end plate 8, a wave outward from the region S is prevented from leaking reflected. Also, into the area S
Part of the flow that has flowed in flows downward along the guide plate 6.
Therefore, this also makes it a low-reflection type
Noh is enhanced. As a result, it is possible to sufficiently suppress the waves that emerge from the breakwater in the wave direction 4 as reflected waves.

Next, a second embodiment will be described with reference to FIGS. In the low-reflection floating breakwater according to the second embodiment, a reflection material is provided on the front edge 1a of the main levee body 1 as a reflection surface of each region S in the low-reflection floating breakwater according to the first embodiment. 7 is attached. The reflector 7 has a triangular cross-sectional shape, and has a depth dimension substantially equal to the water depth of the region S, that is, the end plate 8, so that the top surface of the triangle is directed outward (toward the entrance of the region S). The main bank 1 is attached to the front edge 1a.

With the above structure, in the low-reflection floating breakwater of the second embodiment, the incident wave 5 entering the area S sandwiched between the guide plates 6 of the breakwater in the wave direction 2 is The wave direction is changed by being reflected by the reflector 7 and the wave path 9 of FIG.
As shown in the figure, the wave is repeatedly reflected between the guide plates 6.
While the reflection is repeated, the waves are disturbed as in the case of the first embodiment, the energy of the waves is consumed, and the waves that emerge from the breakwater in the direction of the wave direction 4 as reflected waves are extremely small.

Further, a third embodiment will be described with reference to FIG. In the low-reflection floating breakwater according to the third embodiment, a net-like structure 10 is attached to the entire surface of both surfaces of each guide plate 6 in the low-reflection floating breakwater according to the second embodiment. I have.
Since the net-like structure 10 has an action of breaking the waves reflected by the reflector 7, the wave energy is more smoothly consumed in the low reflection type floating breakwater of the third embodiment. As a result, the waves coming out of the breakwater in the wave direction 4 can be made extremely small.

In the low-reflection floating breakwater of the second embodiment, by forming each guide plate 6 with a perforated plate having a large number of small holes, it is possible to break the reflected wave from the guide plate. In this case, substantially the same operation and effect as those of the third embodiment can be obtained.

[0021]

As described above, according to the low-reflection type floating breakwater of the present invention, the following effects can be obtained. (1) Upon arrival of the incident wave, Oyo plurality of guide plates incident wave
Is advanced in a region surrounded by the fine end plate, by repeated reflections in this region consumes energy of the wave, it is possible to dissipate, also Runode cause flow downward in the region, the reflected wave Can be greatly suppressed. (2) or fitted with reflective material or net-like structure having a triangular cross-section, by or forming many small holes in the guide plate, it is possible to promote the consumption of energy of the wave in the region, the reflection Wave generation can be extremely small. (3) By the above (1) and (2), it is possible to suppress the disturbance of the sea surface due to the interference between the reflected wave and the incident wave, and to eliminate the adverse effect on small vessels navigating in the vicinity. It can be widely used as a wave-dissipating structure.

[Brief description of the drawings]

FIG. 1 is a plan view of a low-reflection floating breakwater as a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG. 1;

FIG. 3 is a plan view of a low-reflection floating breakwater according to a second embodiment of the present invention.

FIG. 4 is a sectional view taken along the line BB of FIG. 3;

FIG. 5 is an enlarged plan view of the main part.

FIG. 6 is a plan view of a low-reflection floating breakwater according to a third embodiment of the present invention.

FIG. 7 is a plan view of a conventional floating breakwater.

FIG. 8 is a sectional view taken along the line CC of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main embankment body 1a Front edge 2, 4 Wave direction 5 Incident wave 6 Guide plate 7 Reflector 8 End plate 9 Wave path 10 Network structure S Area sandwiched by guide plate W Water surface

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E02B 3/06

Claims (4)

(57) [Claims] 1. A floating breakwater comprising a main levee body as a floating body having means for mooring to a water bottom, and a plurality of guide plates projecting from a front edge of the main levee body at intervals. Is
The upper end surface of the guide plate protrudes above the sea surface , and the lower end portion of the guide plate is substantially close to the bottom surface of the main levee body.
Includes a depth dimension extending in a position had the tip portions of the respective guide plates, end plates, characterized in that attached to form a gap between the adjacent end plates to each other, low Reflective floating breakwater. 2. The low-reflection floating breakwater according to claim 1, wherein a reflection material having a triangular cross-sectional shape is formed at a front edge of the main levee body in a region sandwiched between the guide plates. A low-reflection floating breakwater characterized by being mounted so that its chevron is projected outward. 3. The low-reflection floating breakwater according to claim 2, wherein a large number of small holes are formed in each of the guide plates. 4. The low-reflection type floating breakwater according to claim 2, wherein a net-like structure is attached to both surfaces of each of the guide plates. .