一种开边界条件及其在内潮模拟中的应用  

An Open Boundary Condition with Application in Internal Tide Simulation

作　　者：苗春葆 邬丽丹 MIAO Chunbao;WU Lidan(3Clear Technology Co.Ltd.,Beijing 100029,China;College of Environmental Science and Engineering,Zhejiang Gongshang University,Hangzhou,Zhejiang 310018,China)

机构地区：[1]中科三清科技有限公司,北京100029 [2]浙江工商大学环境科学与工程学院,浙江杭州310018

出　　处：《计算物理》2020年第2期163-172,共10页Chinese Journal of Computational Physics

摘　　要：提出一种辐射强迫开边界条件,可以同时作为主动和被动边界条件使用,既可应用于潮汐模拟,也可应用于其他海洋动力过程的模拟.在一个内外模态分离的内潮模型中对各种开边界条件进行对比:在外模态中,Dirichlet条件、辐射强迫条件、Flather条件和松弛条件的对比表明辐射强迫条件与Flather条件表现最好,但辐射强迫条件比Flather条件所需的观测数据更少,具有更广泛的适用性;在内模态中,松弛条件、Sommerfeld辐射条件和基于模态分解的Sommerfeld辐射条件的对比表明松弛条件表现最好.A clamped radiation boundary condition is proposed. Clamped radiation condition can be used as both active and passive open boundary conditions(OBCs), and can be used in simulating tides and other oceanic dynamic processes. Several OBCs were compared in a layered internal tide model with mode-split technique. In external mode, Dirchlet condition, clamped radiation condition, Flather condition and relaxation condition were compared. It shows that performance of clamped radiation condition and Flather condition is the best, but clamped radiation needs less data than Flather contidion, and hence can be applied more widely. In internal mode, relaxation condition, Sommerfeld radiation condition and Sommerfeld radiation condition based on normal mode were compared. It shows that relaxation condition is the best.

关 键 词：开边界条件 内潮 分层模型 

分 类 号：P731.23[天文地球—海洋科学]