Optimal Collocation of Three Kinds of Bragg Breakwaters for Bragg Resonant Reflection by Long Waves
Optimal Collocation of Three Kinds of Bragg Breakwaters for Bragg Resonant Reflection by Long Waves
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长波布拉格共振反射三种布拉格防波堤的优化配置
DOI：
10.1061/(asce)ww.1943-5460.0000278
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发表时间：
2015-05
期刊：
影响因子：
--
通讯作者：
Hui-Dan Zeng
中科院分区：
文献类型：
--
作者：
Huan-Wen Liu;Heng Luo;Hui-Dan Zeng
众所周知，对于平行于海岸线均匀分布在海岸区域的一系列水下人工沙坝，如果入射波列的波长是沙坝间距的两倍，则会发生布拉格共振反射。本文给出了三角形、余弦形和理想梯形杆的线性长波反射问题的三种解析解。这些解析解表明，布拉格共振反射峰值的大小仍然取决于三个杆参数，这是酒吧的数量，无量纲酒吧的高度，和无量纲酒吧的宽度。在深入分析这些参数之间关系的基础上，建立了三组确定三种人工挡土墙最优配置的优化曲线，这对布拉格共振的研究和布拉格防波堤的基础设计具有重要意义。
AbstractIt is well known that, for a series of submerged artificial bars uniformly distributed in the coastal region parallel to the coastline, if the wavelength of the incident wave train is twice that of the bar distance, Bragg resonant reflection occurs. In this paper, three closed-form analytical solutions for linear long-wave reflection for bars with triangular shape, rectified cosinoidal shape, and idealized trapezoidal shape are presented. These analytical solutions show that the magnitude of the peak Bragg resonant reflection still depends on three bar parameters, which are the bar number, the dimensionless bar height, and the dimensionless bar width. Based on intensive analysis of the relations among these parameters, three sets of optimal curves to determine the optimal collocation of the three types of artificial bars are established, which may be very significant in the study of Bragg resonance and in the fundamental design of Bragg breakwaters.
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