考虑河岸变形的三维水沙数值模拟研究  

3D mathematical modeling for fluvial processes considering bank erosion

作　　者：假冬冬[1] 邵学军[1] 王虹[1] 周刚[1] 

机构地区：[1]清华大学水沙科学与水利水电工程国家重点实验室,北京100084

出　　处：《水科学进展》2009年第3期311-317,共7页Advances in Water Science

基　　金：国家自然科学基金资助项目(50879042;50221903);国家科技支撑计划资助项目(2006BAB05B03;2006BAB05B02)~~

摘　　要：将粘性河岸崩塌模拟力学方法与水沙模型相结合,构建了考虑河岸变形的三维数值模型。基于非正交网格,采用局部网格可动技术处理由河岸崩塌引起的河道摆动过程。模型采用有限体积法对方程进行离散,采用与动量插值技术相结合的SIMPLEC算法进行模型求解。通过弯道发展过程的计算表明,模型能够有效地模拟出河道的复杂演变过程。A 3D mathematical modeling considering bank erosion is developed by using both a cohesive bank erosion model and a 3D flow-sediment transport model. The locally-adaptive grid system based on the non-orthogonal grid is proposed to simulate the lateral migration in the channel due to the bank erosion. The governing equations for flow-sediment transport are solved with the finite volume method and the SIMPLEC algorithm with the momentum interpolation. The computed case of the self-forming meander evolution demonstrates that this model is able to predict the complex fluvial processes in alluvial rivers with bank erosion.

关 键 词：河岸崩塌 三维模型 水沙数值模拟 河床变形 

分 类 号：TV147.3[水利工程—水力学及河流动力学]