A method of spatial array of offshore breakwaters for effective wave attenuation

有效消波的近海防波堤空间阵列方法

• 批准号: 63550376
• 负责人: NAKAMURA Takayuki
• 金额: $ 1.02万
• 依托单位: Ehime University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1988
• 资助国家: 日本
• 起止时间: 1988 至 1989
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63550376/
• 关键词: Offshore breakwater system; Effective spatial array; Wave transmission and reflection; Green's function method; Wave height attenuation; Wave direction control; Wave resonance; Resonator-type breakwater; 沖合消波堤; 波高分布; グリーン関数法; 多列式堤体; 共振装置型堤体構造物

(1)Study on numerical approaches on water wave problems around infinitely arrayed 3-D bodies. In order to clarify the spatial allocation of offshore breakwaters for effective attenuation of incoming waves to the shore, analytical procedures of wave interaction among infinitely arrayed offshore breakwaters were developed. Where the following three different approaches were derived, mainly depending upon the configuration of individual breakwater. a)Efficient and practical approach on water wave problems around a 3-D body with plane symmetries. b)Analysis on wave interactions among infinitely arrayed surface piercing structures. c)Analysis on wave interactions among infinitely arrayed 3-D bodies of arbitrary shape.(2)Effective ways for wave attenuation and wave directional change by an array of offshore breakwaters. Changing both the spatial allocations of breakwaters and configurations of individual breakwater, characteristics of wave transmission and reflection as well as wave directio … More nal change by infinitely arrayed offshore breakwater system were examined from both the analytical and experimental points of view. Where the analytical procedures developed before were adopted. The results obtained are summarized in the followings. a)Two dimensional wave diffraction effects are important when a wave length of incoming wave is smaller than the center-to-center distance of aligned breakwaters, because of emerging transverse waves around the breakwater system. In this case, directional characteristics of transmitted and reflected waves should be taken into consideration for assessing the wave attenuation effect. b)Attenuation effects by an array of offshore breakwaters are not significantly depending upon the spatial allocation ways, e.g. linear array and staggered array etc. but heavily depending upon opening ratio of arrayed breakwaters and the ratio of a wave length to a center-to-center distance of neighboring breakwaters. c)Effective wave attenuation may be possible by the use of an array of resonator-type breakwaters. Less

(1)无限排列三维物体周围水波问题的数值方法研究。为了明确防波堤的空间布局，有效地衰减入射波，建立了无限排列防波堤间波浪相互作用的分析方法。其中导出了以下三种不同的方法，主要取决于单个防波堤的配置。a)具有平面对称性的三维物体周围水波问题的有效实用方法。b)无限排列表面穿孔结构之间的波相互作用分析。c)任意形状的无限排列三维体之间的波相互作用分析。(2)防波堤阵对波浪衰减和波浪方向改变的有效途径。同时改变防波堤的空间布局和单个防波堤的构型，波浪的透射和反射特性以及波浪的方向……从分析和实验的角度考察了无限排列防波堤系统的更大的变化。采用以前开发的分析程序。所得结果总结如下。a)当入射波的波长小于排列的防波堤的中心距离时，由于防波堤系统周围出现横波，二维波衍射效应很重要。在这种情况下，在评估波的衰减效果时，应考虑透射波和反射波的方向特性。b)防波堤阵阵的衰减效应不受线性阵阵、交错阵阵等空间配置方式的显著影响，而主要取决于防波堤阵阵的开孔比和相邻防波堤的波长与中心距离的比值。c)使用谐振式防波堤阵列可以有效地衰减波浪。少

项目成果

中村孝幸: "共振装置を設けた堤体列による波浪の制御効果について" 土木学会海岸工学論文集. 36. 484-488 (1989)

Takayuki Nakamura：“论配备谐振装置的路堤阵列的波浪控制效果”，日本土木工程师学会会议记录，海岸工程学，36. 484-488 (1989)。

Takayuki Nakamura: "Analysis of wave height distribution and wave force around a finite array of offshore breakwaters." Proc. of Coastal Engineering in Japan, Vol.36, pp.479-483, 1989.

Takayuki Nakamura：“分析有限阵列的近海防波堤周围的波高分布和波浪力。”

中村孝幸: 土木学会海岸工学講演会論文集. 35. 712-716 (1988)

Takayuki Nakamura：日本土木工程师学会海岸工程会议记录，35. 712-716 (1988)。

中村孝幸: "規則効列された3次元物体まわりの波浪境界値問題の検析法とその適用性" 土木学会海岸工学論文集. 37. (1990)

Takayuki Nakamura：“规则排列的三维物体周围的波浪边值问题的分析方法及其适用性”，日本土木工程师学会会议记录，海岸工程学报，37。（1990）。

Takayuki Nakamura: "Analysis on water wave problems around an infinite array of 3-D bodies of arbitrary shape." Proc. of Coastal Engineering in Japan, Vol.37, 1990.

Takayuki Nakamura：“对任意形状的 3D 物体无限阵列周围的水波问题的分析。”