JP2695697B2 - Floating breakwater - Google Patents
Floating breakwaterInfo
- Publication number
- JP2695697B2 JP2695697B2 JP2327015A JP32701590A JP2695697B2 JP 2695697 B2 JP2695697 B2 JP 2695697B2 JP 2327015 A JP2327015 A JP 2327015A JP 32701590 A JP32701590 A JP 32701590A JP 2695697 B2 JP2695697 B2 JP 2695697B2
- Authority
- JP
- Japan
- Prior art keywords
- wave
- floating body
- box
- width
- breakwater
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000007788 liquid Substances 0.000 claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 230000005484 gravity Effects 0.000 description 10
- 238000002834 transmittance Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000012267 brine Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/11—Hard structures, e.g. dams, dykes or breakwaters
Landscapes
- Revetment (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は浮消波堤に関する。Description: TECHNICAL FIELD The present invention relates to a floating breakwater.
浮消波堤としては、従来、例えば、第３図平面図に示
すように、波01の進行方向02に対し、長手方向が直交す
るように係留鎖03を介して横方向に長い箱型浮体04を水
面に係留し、箱型浮体04の背後に静穏水域05を形成する
ものが知られている。Conventionally, as a floating breakwater, for example, as shown in the plan view of FIG. 3, a box-shaped floating body that is long in the transverse direction via a mooring chain 03 so that the longitudinal direction is orthogonal to the traveling direction 02 of the wave 01 It is known that the mooring 04 is formed on the water surface to form a calm water area 05 behind the box-shaped floating body 04.
この種の浮消波堤の消波性能は、入射波の波長により
異なり、一般に短い波長の波ほど消波し易く、かつ消波
可能波長領域は、箱型浮体04の波01の入射方向02に平行
な鉛直断面の形状によって、ほぼ決定される。The wave-breaking performance of this type of floating breakwater depends on the wavelength of the incident wave. Generally, the shorter the wavelength, the easier the wave is broken, and the wave-breakable wavelength region is the incident direction 02 of the wave 01 of the box-shaped floating body 04. It is almost determined by the shape of the vertical section parallel to.
すなわち、第４図断面図に示す箱型浮体04の巾がＢ
で、吃水がｄの浮消波堤の規則波中における消波特性
は、第５図線図で示され、同図で横軸は波長入と箱型浮
体04の巾Ｂとの比、縦軸は波01の透過率（透過波高／入
射波高）であり、B/dがパラメーターとして記入されて
いる。これから、同一巾の箱型浮体04の場合、吃水ｄが
増えるとより長い波長に対して消波性能が向上するが、
短い波長に対して消波性能が低下するので、要求される
透過率の値によって吃水ｄの適値が決定され、従って消
波性能の発揮される波長領域が制限される。That is, the width of the box-shaped floating body 04 shown in the sectional view of FIG.
The wave-breaking characteristics of the floating breakwater with a draft of d in the regular wave are shown in Fig. 5, where the horizontal axis represents the ratio between the wavelength input and the width B of the box-shaped floating body 04, The vertical axis is the transmittance of wave 01 (transmitted wave height / incident wave height), and B / d is entered as a parameter. From this, in the case of the box-shaped floating body 04 of the same width, the wave-cancelling performance is improved for a longer wavelength as the draft d increases,
Since the wave-absorbing performance decreases for shorter wavelengths, the appropriate value of the draft d is determined by the required value of the transmittance, and thus the wavelength region in which the wave-absorbing performance is exhibited is limited.
また、第６図断面図に示すように、浮体06が左右１対
の側板07と開口08が開けられた底板09等により構成さ
れ、内部に自由水010が形成された動揺制御型の浮消波
堤も知られている。As shown in the cross-sectional view of FIG. 6, the floating body 06 is constituted by a pair of left and right side plates 07 and a bottom plate 09 having an opening 08 formed therein. Breakwaters are also known.
この種の浮消波堤では、自由水010が浮体06の巾中心
位置を節とし、側板07の位置を腹とする振動であるスロ
ッシングを行うので、その周期近傍においては、自由水
010の共振によるエネルギ吸収で消波性能は向上する。In this type of floating breakwater, free water 010 performs sloshing, which is a vibration at the center of the width of the floating body 06 as a node and antinode at the position of the side plate 07.
The wave absorption performance is improved by the energy absorption by the resonance of 010.
すなわち、第７図線図に示すように、λ/Bがほぼ２の
ところで波の透過率は極小値を示し、この値は箱型浮体
04の同位置における値より小さく、またλ/B＝２はスロ
ッシングの固有周期に相当する周期の波の波長と浮体06
の巾Ｂとの比に相当する値である。That is, as shown in the diagram of FIG. 7, the wave transmittance shows a minimum value when λ / B is almost 2, and this value is a box-shaped floating body.
04 is smaller than the value at the same position, and λ / B = 2 is the wavelength of the wave having a period corresponding to the natural period of the sloshing and the floating body 06.
Is a value corresponding to the ratio to the width B.
そして、B/dが定まっている場合には、波の透過率が
小さくなる範囲は、波長の短い領域に限られることが判
る。Then, when B / d is determined, it can be seen that the range in which the wave transmittance decreases is limited to the region with a short wavelength.
従って、このような構造では、より長い波長領域に対
応するためには、浮体06の巾Ｂを大きくせざるを得ず、
その結果係留鎖03を含めた浮消波堤の原価が嵩む欠点が
ある。Therefore, in such a structure, in order to cope with a longer wavelength region, the width B of the floating body 06 must be increased,
As a result, there is a disadvantage that the cost of the floating breakwater including the mooring chain 03 increases.
本発明は、このような事情に鑑みて提案されたもの
で、浮体巾を大きくせずに、長い波長領域に有効な、従
って経済性及び消波性に優れた浮消波堤を提供すること
を目的とする。The present invention has been proposed in view of such circumstances, and it is an object of the present invention to provide a floating breakwater which is effective in a long wavelength region without increasing the width of a floating body, and is therefore excellent in economical efficiency and wave breaking performance. With the goal.
そのために、本発明は波の進行方向に対し長手方向が
直交するように係留鎖を介して箱型浮体を水面に係留し
上記箱型浮体の背後に静穏水域を形成する浮消波堤にお
いて、比重が異なりかつ互いに混合しにくい２種類の液
体を封入した２液スロッシングタンクを内蔵することを
特徴とする。For that purpose, the present invention relates to a floating breakwater which moores a box-shaped floating body to the water surface via a mooring chain so that the longitudinal direction is orthogonal to the traveling direction of the wave and forms a calm water area behind the box-shaped floating body, It is characterized by incorporating a two-liquid sloshing tank in which two kinds of liquids having different specific gravities and hard to mix with each other are filled.
浮体に設置された２液スロッシングタンク内の比重が
適宜に選択され、かつ互いに混合しにくい上層液と下層
液との境界に生ずる内部波により、長い固有周期のスロ
ッシングモードを得ることができるので、これが長波長
の波により波の進行方向に往復動する浮体の運動を抑制
することができる。Since the specific gravity in the two-liquid sloshing tank installed on the floating body is appropriately selected, and the internal wave generated at the boundary between the upper liquid and the lower liquid that are difficult to mix with each other, a sloshing mode having a long natural period can be obtained. This can suppress the movement of the floating body which reciprocates in the traveling direction of the wave due to the long wavelength wave.
本発明の一実施例を図面について説明すると、第３〜
７図と同一の符番はそれぞれ同図と同一の部材を示し、
まず、第１図断面図において、１は箱型浮体04の内部に
設置された立方体状の２液スロッシングタンクで、その
内部には比重が異なり、かつ互いに混合し難い２種類の
液体が封入されている。ちなみに、本実施例では上層液
２は比重がρ1の油、下層液３は比重がρ2の食塩水で、
またスロッシングタンク１の巾ｂは箱型浮体04の巾Ｂの
1/2である。One embodiment of the present invention will be described with reference to the drawings.
7 denote the same members as those in FIG.
First, in the sectional view of FIG. 1, reference numeral 1 denotes a cubic two-liquid sloshing tank installed inside a box-shaped floating body 04, in which two kinds of liquids having different specific gravities and hard to mix with each other are sealed. ing. Incidentally, supernatant 2 in this embodiment the oil of specific gravity [rho 1, in brine lower layer solution 3 specific gravity [rho 2,
The width b of the sloshing tank 1 is the same as the width B of the box-shaped floating body 04.
1/2.
このような構造において、箱型浮体04が波の進行方向
に往復動すると、２液スロッシングタンク１内の上層液
２と下層液３との境界に生ずる内部波により長い固有周
期のスロッシングモードが得られ、その際の２液スロッ
シングタンク１のスロッシング固有周期を周期とする波
の波長λsと箱型浮体04の巾Ｂとの比は（１）式で示す
関係がある。In such a structure, when the box-type floating body 04 reciprocates in the traveling direction of the wave, a sloshing mode having a long natural period is obtained by an internal wave generated at the boundary between the upper liquid 2 and the lower liquid 3 in the two-liquid sloshing tank 1. In this case, the ratio of the wavelength λ s of the wave having the period of the sloshing natural period of the two-liquid sloshing tank 1 to the width B of the box-shaped floating body 04 has a relationship represented by the following equation (1).
ちなみに、公知の動揺制御型の浮消波堤では、比重ρ
1が空気で比重ρ2の海水に比べて非常に小さく、かつス
ロッシングタンクの巾が浮体06の巾に等しいので、それ
等の値を（１）式の右辺に代入すると、 すなわち、第７図の波の透過率極小値のλ/Bに一致す
る。 By the way, in a known sway control type breakwater, specific gravity ρ
1 is very small compared to the seawater density [rho 2 in air, and since the width of the sloshing tank is equal to the width of the floating body 06, and substituting the value of it, such as in (1) of the right side, That is, it is equal to the minimum value of the transmittance of the wave λ / B in FIG.
しかして、本実施例では（１）式の右辺の は１以上であり、ρ2とρ1との差が小さければ大きな値
になるので、第２図線図に示すように、λs/Bは十分大
きな値とすることが可能で、その周辺の波長領域におい
て波の透過率を大巾に下げることができるようになる。Thus, in the present embodiment, the right side of equation (1) Is greater than or equal to 1 and becomes large if the difference between ρ 2 and ρ 1 is small, so that λ s / B can be made a sufficiently large value as shown in the diagram of FIG. In the wavelength region of, the wave transmittance can be greatly reduced.
例えば、比重ρ1を0.85、比重ρ2を1.05、２液スロッ
シングタンク１の巾ｂを箱型浮体04の巾Ｂの1/2とし
て、それ等の値を（１）式にそれぞれ代入すると、 となる。For example, the specific gravity [rho 1 0.85, 1/2 of the width B of the specific gravity [rho 2 of the box-shaped floating body 04 a width b of 1.05,2 liquid sloshing tank 1, and if the values are the value of it, such as in (1), Becomes
このような構造によれば、浮体に設置された２液スロ
ッシングタンク内の比重が適宜に選択され、かつ互いに
混合しにくい上層液と下層液との境界に生ずる内部波に
より、長い固有周期のスロッシングモードを得ることが
できるので、これが長波長の波により波の進行方向に往
復動する浮体の運動を抑制し、従って長波長の波を消波
するのに浮体の巾を大きくすることが不要となり、浮消
波堤の経済性及び消波性が向上する。According to such a structure, the specific gravity in the two-liquid sloshing tank installed on the floating body is appropriately selected, and the sloshing having a long natural period is generated by an internal wave generated at the boundary between the upper liquid and the lower liquid that are difficult to mix with each other. Since the mode can be obtained, this suppresses the movement of the floating body reciprocating in the traveling direction of the wave due to the long wavelength wave, so that it is not necessary to increase the width of the floating body to cancel the long wavelength wave. In addition, the economics and wave breaking of the floating breakwater are improved.
要するに本発明によれば、波の進行方向に対し長手方
向が直交するように係留鎖を介して箱型浮体を水面に係
留し上記箱型浮体の背後に静穏水域を形成する浮消波堤
において、比重が異なりかつ互いに混合しにくい２種類
の液体を封入した２液スロッシングタンクを内蔵するこ
とにより、浮体巾を大きくせずに、長い波長領域に有効
な、従って経済性及び消波性に優れた浮消波堤を得るか
ら、本発明は産業上極めて有益なものである。In short, according to the present invention, there is provided a floating breakwater which moores a box-shaped floating body to a water surface via a mooring chain so that a longitudinal direction is orthogonal to a traveling direction of a wave and forms a calm water area behind the box-shaped floating body. Built-in two-liquid sloshing tank filled with two kinds of liquids having different specific gravities and difficult to mix with each other, it is effective for a long wavelength region without increasing the width of the floating body, and therefore has excellent economy and wave-absorbing property The present invention is industrially very useful because it provides a floating breakwater.
第１図は本発明の一実施例を示す断面図、第２図は第１
図の浮消波堤の消波特性を示す線図である。 第３図，第４図はそれぞれ公知の箱型浮消波堤を示す平
面図，断面図、第５図は第３図の浮消波堤の消波特性を
示す線図、第６図は公知の動揺制御型浮消波堤を示す断
面図、第７図は第６図の浮消波堤の消波特性を示す線図
である。 １……２液スロッシングタンク、２……上層液、３……
下層液、03……係留鎖、04……箱型浮体、B,b……巾、FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG.
It is a diagram which shows the wave-dissipation characteristic of the floating breakwater of the figure. 3 and 4 are a plan view and a sectional view, respectively, showing a known box-type floating breakwater. FIG. 5 is a diagram showing the wave-damping characteristics of the floating breakwater of FIG. 3, and FIG. FIG. 7 is a cross-sectional view showing a known vibration control type breakwater, and FIG. 7 is a diagram showing the wave-damping characteristics of the floating breakwater of FIG. 1 ... 2 liquid sloshing tank, 2 ... upper liquid, 3 ...
Lower layer liquid, 03 ... mooring chain, 04 ... box floating body, B, b ... width,
Claims (1)
うに係留鎖を介して箱型浮体を水面に係留し上記箱型浮
体の背後に静穏水域を形成する浮消波堤において、比重
が異なりかつ互いに混合しにくい２種類の液体を封入し
た２液スロッシングタンクを内蔵することを特徴とする
浮消波堤。1. A floating breakwater which moores a box-shaped floating body to a water surface via a mooring chain so that a longitudinal direction is orthogonal to a traveling direction of a wave and forms a calm water area behind the box-shaped floating body. A floating breakwater characterized by having a built-in two-liquid sloshing tank filled with two types of liquids that are different and hard to mix with each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2327015A JP2695697B2 (en) | 1990-11-28 | 1990-11-28 | Floating breakwater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2327015A JP2695697B2 (en) | 1990-11-28 | 1990-11-28 | Floating breakwater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04194208A JPH04194208A (en) | 1992-07-14 |
| JP2695697B2 true JP2695697B2 (en) | 1998-01-14 |
Family
ID=18194363
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2327015A Expired - Lifetime JP2695697B2 (en) | 1990-11-28 | 1990-11-28 | Floating breakwater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2695697B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100446463B1 (en) * | 2001-10-25 | 2004-09-01 | 한국해양연구원 | Mobile Offshore System for Fresh Water Storage |
| JP2019132082A (en) * | 2018-02-01 | 2019-08-08 | 国立大学法人名古屋大学 | Temporary wave breaker, and connection type temporary wave breaker |
| CN115023533A (en) * | 2019-11-11 | 2022-09-06 | J.雷.麦克德莫特股份有限公司 | Destructive coupling system and method for subsea systems |
-
1990
- 1990-11-28 JP JP2327015A patent/JP2695697B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04194208A (en) | 1992-07-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Tokić et al. | Hydrodynamics of periodic wave energy converter arrays | |
| KR100845415B1 (en) | Anti-Rolling Structure For Box-Type Floating Body | |
| JP2695697B2 (en) | Floating breakwater | |
| US3757526A (en) | Floating boom structures | |
| US2886951A (en) | Apparatus for the utilization of the energy of waves | |
| JPH01142273A (en) | Floating wave-removing type wave-power generating device | |
| JP2650819B2 (en) | Floating breakwater | |
| JP2500727Y2 (en) | Floating breakwater | |
| JPH083456Y2 (en) | Floating breakwater | |
| CA1094828A (en) | Floating breakwater | |
| JP2002180436A (en) | Floating wave dissipating bank | |
| JPH0892939A (en) | Floating type breakwater with fin | |
| JP4653330B2 (en) | Seawater breakwater caisson | |
| JP2735470B2 (en) | Floating breakwater | |
| Panduranga et al. | Wave interaction with inverse t-shaped porous floating breakwater | |
| JPH06212611A (en) | Breakwater | |
| JP3744752B2 (en) | Oscillating water column type breakwater | |
| JPS61294010A (en) | Floating breakwater | |
| JPH08226113A (en) | Low reflective type floating wave dissipation revetment | |
| JP2596772B2 (en) | Wave absorber | |
| KR200333611Y1 (en) | Construction of cargo for l.n.g tank ship | |
| Maeda et al. | Hydro-elastic response reduction system of a very large floating structure with wave energy absorption devices | |
| JPS60242206A (en) | Construction framework for wave-dissipating marine structures | |
| JPS6227533Y2 (en) | ||
| JP2587512B2 (en) | Floating breakwater |