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）三维无限体水波问题的数值方法研究。为了明确离岸式防波堤的空间布置对海岸向岸波的有效衰减，建立了无限排列离岸式防波堤间波浪相互作用的分析方法。其中，主要根据单个防波堤的配置，推导出以下三种不同的方法。a）平面对称三维物体周围水波问题的有效实用方法。B）无限排列的穿水面结构物间的波浪相互作用分析。（3）任意形状的无限排列的三维物体之间的波浪相互作用的分析。（2）研究了离岸堤群消波和改变波浪方向的有效途径。通过改变防波堤的空间布置和单堤体型，可以改变防波堤的透波、反射特性和波向， ...更多信息 本文从理论分析和试验研究两个方面研究了无限排列防波堤系统的最终变化。采用之前开发的分析方法。所得结果总结如下。a）当入射波的波长小于对齐的防波堤的中心到中心的距离时，二维波浪衍射效应是重要的，因为在防波堤系统周围出现横波。在这种情况下，应考虑透射波和反射波的方向特性，以评估波衰减效果。B）离岸堤阵列的衰减效果与空间布置方式（如直线阵列、交错阵列等）的关系不大，而与阵列堤的开口率和相邻堤的波长与中心距的比值关系较大。c）通过使用共振型防波堤阵列，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。”