Numerical simulation of channel pattern changes Part Ⅰ: Mathematical model  

作　　者：Hong WANG Gang ZHOU Xuejun SHAO 

机构地区：[1]State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China [2]State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China [3]State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China

出　　处：《International Journal of Sediment Research》2010年第4期366-379,共14页国际泥沙研究（英文版）

基　　金：Financial support from China’s National Natural Science Foundation (No. 50879042, 50979043)

摘　　要：This paper presents a computational fluid dynamics model for simulation of twodimensional （2-D） water flow, sediment transport, bank failure processes, and the subsequent channel pattern changes. Effects of secondary currents at channel bends are included in the modified momentum conservation equation of water flow. An improved bank failure model is applied to calculate bank failure due to riverbed erosion, and to simulate lateral migration and planform changes of alluvial channels. The water flow model has been validated using laboratory measurements of flow in consecutive bends designed by the authors, in addition to flume test data from the literature.This paper presents a computational fluid dynamics model for simulation of twodimensional （2-D） water flow, sediment transport, bank failure processes, and the subsequent channel pattern changes. Effects of secondary currents at channel bends are included in the modified momentum conservation equation of water flow. An improved bank failure model is applied to calculate bank failure due to riverbed erosion, and to simulate lateral migration and planform changes of alluvial channels. The water flow model has been validated using laboratory measurements of flow in consecutive bends designed by the authors, in addition to flume test data from the literature.

关 键 词：Channel pattern changes Bank failure processes Two-dimensional numerical simulation Secondary currents Sediment transport 

分 类 号：TU435[建筑科学—岩土工程] U65[建筑科学—土工工程]