不同因素对人工岛波浪绕射影响研究  

Study on wave diffraction of artificial island with different elements

作　　者：于定勇[1] 李龙 

机构地区：[1]中国海洋大学工程学院,山东青岛266100 [2]三亚海航基础投资有限公司,海南三亚572000

出　　处：《海洋工程》2017年第1期105-111,120,共8页The Ocean Engineering

基　　金：山东省自然科学基金(ZR2013EEZ002)

摘　　要：为研究人工岛尺度变化和波浪方向分布对人工岛绕射波浪的影响,基于MIKE21-BW模型应用数值方法模拟人工岛波浪绕射过程。数值结果与Briggs等的物理试验结果的对比表明两者吻合较好,验证了模型的适用性。在规则波条件时,圆形人工岛绕射波浪的数值结果与线性波浪绕射理论解基本一致;采用该模型分别模拟了6种尺度的圆形人工岛、单向不规则波和9种方向分布θ_(max)、4种谱峰周期条件时绕射波浪分布情况。分析结果表明,圆形人工岛绕射系数随着尺度的增加,掩护区绕射系数随之减小;θ_(max)在10°~45°范围内,随着θmax的增大,绕射系数随之增大,θ_(max)在45°~75°内绕射系数变化较小;随着谱峰周期的增加,绕射系数随之增大。研究成果既为相关规范的完善提供了基础,也为相关工程设计提供了参考。In order to study the effects of scales and wave directional spectrum on wave diffraction of artificial island,based on MIKE21-BW model,this paper numerically calculates the influence of different scales and wave directional spectrum on wave diffraction coefficients of artificial island.In simulating,conditions of the incident wave are supposed the same as Briggs’ physical experiment.The values of diffraction coefficients obtained by simulation agree well with experimental data.The comparison results can verify the applicability of BW model for this study.The values obtained by simulation with 5 cases of scales of the artificial cylinder island differ quite little from the theoretical results.This paper simulates 6 cases of different structure scales,i.e.πD/L=π,2π,3π,4π,5π,6π,respectively,and numerically studies wave diffraction under unidirectional wave,nine maximum wave distributional angles and seven spectral peak periods of different directional waves.The following results are obtained from the simulation：Diffraction coefficients become smaller with the increase of scales of the artificial cylinder island in the protected area.Within the range of 10°~45°of maximum distributional angles,diffraction coefficients become bigger with increasing the maximum distributional angles.Within the range of 45°~75°,diffraction coefficients have a small variation.Diffraction coefficients become bigger with the increase of seven spectral peak periods.The research results obtained in this paper not only provide the basis for the related standard,but also could be used for reference of engineering application.

关 键 词：MIKE21-BW 人工岛 绕射系数 尺度 波浪要素 

分 类 号：TV139.2[水利工程—水力学及河流动力学]