JP3300733B2 - 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. 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. 4 (plan view) and FIG. 5 (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. As a result, the installation area of the floating breakwater is limited, which is a factor that prevents the floating breakwater from being widely used as a wave breaking structure.

An object of the present invention is to provide a low-reflection floating breakwater which reduces reflected waves from the levee body as described above and does not adversely affect small boats sailing in the vicinity. And

[0005]

In order to achieve the above object, a low-reflection type floating breakwater according to the present invention has a low-reflection type floating breakwater having a main bank as a floating body moored through mooring means. A levee, wherein the low-reflection type floating breakwater includes at least three or more reflectors for reflecting waves, and a distance between each of the reflectors and a front edge of the main levee body is On the basis of the wavelengths of a plurality of types of incident waves selected from the wavelengths of a plurality of types of incident waves predicted in advance, each of the reflectors is approximately １ ／ times the wavelength of the selected incident wave. The length is set so that the distance between the adjacent reflectors and the leading edge is not the same, and the difference between the distance between the neighboring reflectors and the leading edge is maximized. If
The reflectors are arranged along the front edge of the main bank at a distance from each other.

[0006]

According to the low-reflection type floating breakwater of the present invention described above, the reflector attached to the front edge of the main bank reflects an incident wave incident on the floating breakwater. Since the reflector is provided at a distance from the leading edge of the main levee that is approximately one-quarter the wavelength of the incident wave, this reflected wave is directly reflected at the leading edge of the floating breakwater The phase is opposite to the reflected wave. Then, reflected waves having opposite phases interfere with each other to suppress the generation of reflected waves from the floating breakwater. Also, by changing the distance between the reflector and the front edge of the main embankment, at least three or more
The reflector is arranged, and before each other adjacent reflector together
By preventing the difference between the leading edge and the leading edge from being maximized, the same reflected wave generation suppressing action as described above is performed for each of the incident waves of a plurality of wavelengths.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a low-reflection floating breakwater according to an embodiment of the present invention. FIG. 2 is a sectional view taken along the line AA of FIG. FIG. 4 is a plan view for explaining the operation.

In FIGS. 1 to 3, reference numeral 1 denotes a main levee body composed of a substantially rectangular floating body in plan view.
Is moored to the sea floor by a mooring line (not shown) attached to a sinker (not shown) installed on the sea floor. The main levee body 1 is arranged so as to be perpendicular to the incident direction of the incident wave 2, and at the front edge 5 facing the incident wave 2,
A plurality of reflectors 3a to 3c are arranged in parallel with the front edge 5 with a space therebetween in the following manner. That is, a mounting plate 4a is provided at the front edge 5 of the main levee body 1 so as to protrude at a right angle, and a reflecting plate 3a is mounted at the tip of the mounting plate 4a.

Similarly, mounting plates 4b, 4c are provided with reflecting plates 3b, 3c projecting at right angles to the front edge 5 of the main bank 1.
Is attached to each of the end portions. Here, each length of the mounting plates 4a, 4b, 4c, that is, the reflecting plate 3
a, 3b, 3c and each interval la, lb, l between the leading edge 5
c is formed in a relationship of la>lb> lc, and each is set to a specific dimension described later.

In the case of this embodiment, as shown in FIG. 1, the reflectors 3a to 3c are located at the same position (the position at which the interval between the reflectors 3a to 3c and the leading edge 5 is the same). The main embankment body 1 is spaced apart by substantially equal dimensions so as not to be extremely separated from adjacent reflectors (a position where the difference in distance between the leading edge 5 is not maximized). Are arranged over the entire length of the front edge 5 of the first member. Each of the reflectors 3a to 3c is formed in substantially the same shape.
Also, the intervals between the reflection plates need not always be equal. Next, the operation will be described.

In FIG. 3, the incident wave of the incident wave 2 directly incident on the main bank 1 is designated as 22, the reflected wave of the incident wave 22 reflected at the front edge 5 is designated as 22a, and the reflector 3a of the incident wave 2 is designated as 22a. Assuming that the incident wave at the part of the incident wave 21 is 21 and the reflected wave of the incident wave 21 reflected by the reflector 3a is 21a, the wavelength L of the incident waves 21 and 22 is between the reflector 3a and the front edge 5 of the main bank 1. When the interval l (ell) is four times (L = 41 (ell)), the phases of the reflected waves 21a and 22a are opposite to each other. As a result, the reflected wave 21a and the reflected wave 22
a interfere with each other and cancel each other, the reflected waves 21a,
22a almost disappears, and as a result, low reflection is achieved.

The above-described low reflection due to the mutual interference effect between the reflected waves 21a and 22a is achieved for an incident wave having a wavelength of about 41 (ell).

Therefore, the distances l (el) b and l (el) c between the other reflectors 3b and 3c and the front edge 5 are set to dimensions different from l (el), respectively. l
It is needless to say that by setting (l) b ≠ l (c) c, low reflection effects are respectively performed on incident waves having wavelengths near 4l (b) b and 4l (l) c. In this embodiment, as shown in FIG. 1, the reflectors 3a to 3c are disposed around almost the entire length of the front edge 5 of the main embankment body 1, and a low reflection action is performed on incident waves in a wide wavelength range. A floating breakwater with sufficiently suppressed reflected waves can be obtained.

In this embodiment, three types of reflectors are provided with a distance from the front edge 5 of the main bank 1 as a reflection plate. It is needless to say that a low-reflection floating breakwater capable of coping with the incident wave of the above is obtained.

[0015]

As described above in detail, according to the low-reflection type floating breakwater of the present invention, it is possible to reduce the wave reflected by the wave in a wide wavelength range, and thereby the floating breakwater can be reduced. It is possible to eliminate the problem of hindering the navigation and fishing operations of nearby ships due to waves reflected from the shore, and to obtain the advantage that the floating breakwater can be widely used as a wave-breaking 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 for explaining the operation.

FIG. 4 is a plan view of a conventional floating breakwater.

FIG. 5 is a sectional view taken along the line BB in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main levee body 2 Incident wave 3a-3c Reflector plate 4a-4c Mounting plate 5 Front edge of main levee body 21 Incident wave incident on reflector plate 3a 22 Incident wave directly incident on main levee body 1 21a incident Reflected wave 22a of reflected wave 21 Reflected wave of incident wave 22 L Wavelength of incident wave 2 1 (ell) Distance between reflector 3a and leading edge

Claims (1)

(57) [Claims] 1. A low-reflection floating breakwater having a main bank as a floating body moored via mooring means, wherein the low-reflection floating breakwater has at least three waves for reflecting waves. More than
The upper reflector, the interval between each reflector and the front edge of the main levee body, the wavelength of a plurality of types of incident waves selected from a plurality of types of wavelengths of the incident waves expected in advance Is set to a length of about 倍 times the wavelength of the selected incident wave for each of the reflectors, and the intervals between adjacent reflectors and the leading edge are the same. The reflectors are spaced apart from each other along the front edge of the main embankment so that the distance between the adjacent reflectors and the leading edge of the reflector does not become maximum. A low-reflection floating breakwater, characterized by being spaced apart.