岛礁三维SWASH模型的时空敏感性分析  

Spatio-temporal sensitivity analysis of three-dimensional SWASH model for reef simulation

作　　者：陈汉宝[1] 钟生 陈松贵 时健[2] CHEN Han-bao;ZHONG Sheng;CHEN Song-gui;SHI Jian(Tianjin Research Institute for Water Transport Engineering,Tianjin 300456,China;College of Harbor,Coastal and Offshore Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]交通运输部天津水运工程科学研究所,天津300456 [2]河海大学港口海岸与近海工程学院,南京210098

出　　处：《水道港口》2022年第5期561-569,共9页Journal of Waterway and Harbor

基　　金：国家自然科学基金(52001149,52039005,51861165102);中央级公益性科研院所基本科研业务费(TKS20220301,TKS20220601,TKS20210102,TKS20210110)。

摘　　要：为了探究SWASH模型中计算网格尺寸及计算时间步长对于解决深海至浅水三维复杂地形下波浪和水流运动的影响程度,在对其控制方程、边界条件、数值求解等介绍的基础上,采用多组不同的计算网格尺寸和不同的计算时间步长对三维地形试验下珊瑚岛礁概化模型进行波流场的模拟,并将模拟结果与物理模型试验的实测结果进行对比。结果表明:SWASH模型的数值模拟结果对计算网格尺寸表现得比较敏感,对计算时间步长表现得并不敏感,并且在合适的参数选取下,SWASH模型可以较好地模拟波浪在近岸区域所发生的浅水变形,以及在岛礁地形区域的波浪破碎和绕射等物理现象,其流速和波高沿波浪入射方向的模拟值与物理模型的试验值结果吻合程度较好,说明SWASH模型能够较好地适用于近岸复杂地形下波浪传播的数值模拟。In this paper,the influence of the computational grid size and time step in SWASH model on wave and flow movement are investigated,especially over complex reef terrain.Firstly,governing equations,boundary conditions and numerical solution are introduced.Different computational grid sizes and different time steps were set to simulate the wave and flow field on 3D coral island reef model.Comparing the numerical results with the physical model test,it can be found that SWASH model are sensitive to the calculation grid size,but not to the calculation time step.With appropriate parameters selected,SWASH model can reproduce the shallow water deformation of waves in the nearshore area and wave breaking and diffraction in the island reef terrain area very well.The simulated velocity and wave height along the wave incidence direction are in good agreement with the experimental results.It has been proven that SWASH model is suitable for simulation of wave propagation in complex coastal terrain.

关 键 词：SWASH 珊瑚岛礁 敏感性分析 波流 波浪破碎 

分 类 号：U698[交通运输工程—港口、海岸及近海工程]