植被对波浪作用下床面切应力影响的数值模拟分析  

Numerical study on influence of vegetation on bed shear stress under coastal waves

作　　者：葛昭佩 唐军[1] 赵楚嫣 Ge Zhaopei;Tang Jun;Zhao Chuyan(State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116023,China)

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116023

出　　处：《海洋学报》2022年第11期111-120,共10页

基　　金：国家重点研发计划(2017YFC1404200)。

摘　　要：本文基于OpenFOAM建立三维波浪数值水槽,模拟计算植被水域波浪作用下的床面切应力,分析了入射波高、植被密度、植被淹没高度、水流对植被水域波浪作用下床面切应力的影响。结果表明:纯波时,由于植被的阻水作用,植被水域床面切应力沿程衰减,其衰减程度与入射波高、植被密度及植被淹没高度呈现正相关;与纯波时相比,在波浪和同向流共同作用下正向床面切应力幅值增大,负向床面切应力幅值减小;弱水流对植被水域床面切应力的大小及分布无明显影响;强水流时,床面切应力在植被水域先增大后逐渐减小并在植被水域后显著降低。To analyze the effects of wave height, vegetation density, submerged height of vegetation and current on the bed shear stress at vegetation zones, a three-dimensional wave-current numerical flume is established based on OpenFOAM in this study. The results show that the bed shear stress attenuates along the vegetation zones because of the blocking effect of vegetation, and the decay rate is positively correlated with the wave height, vegetation density and submerged height of vegetation. Compared with pure wave, the amplitude of positive bed shear stress increases and the amplitude of negative bed shear stress decreases under the condition of combined wave-current flows. The weak current has no obvious effect on the size and distribution of the bed shear stress at vegetation zones. In the case of strong current, the bed shear stress increases at vegetation zones and suddenly decreases after the vegetation zones.

关 键 词：海岸植被 波浪 床面切应力 OPENFOAM 

分 类 号：P731.22[天文地球—海洋科学]