Formation process of meandering channel by a 2D numerical simulation  

作　　者：Yi XIAO Xue-jun SHAO Hong WANG Gang ZHOU 

机构地区：[1]State Key Laboratory of Hydroscience and Engineering,Tsinghua University [2]Post-doctoral research fellow,Chinese Research Academy of Environmental Sciences

出　　处：《International Journal of Sediment Research》2012年第3期306-322,共17页国际泥沙研究（英文版）

基　　金：Financial support from China's National Natural Science Foundation(No.50979043,51039004);Open Research Fund Program of State key Laboratory of Hydroscience and Engineering(No: sklhse-2011-B-02)

摘　　要：A 2D depth-averaged model for hydrodynamic, sediment transport and river morphological adjustment is presented. The sediment transport submodel considers non-uniform sediment, bed surface armoring, impact of secondary flow on the direction of bed-load transport, and transverse slope of river bed. The bank erosion submodel incorporates a simple simulation method for updating bank geometry during either degradational or aggradational bed evolution. The model is applied to a 180~ bend with a constant radius under unsteady flow conditions, and to Friedkin＇s laboratory meander channels. The results are in acceptable agreement with measurements, confirming the two dimensional model＇s potential in predicting the formation of river meandering and improving understanding of patterning processes. Future researches are needed to clarify some simplifications and limitations of the model.A 2D depth-averaged model for hydrodynamic, sediment transport and river morphological adjustment is presented. The sediment transport submodel considers non-uniform sediment, bed surface armoring, impact of secondary flow on the direction of bed-load transport, and transverse slope of river bed. The bank erosion submodel incorporates a simple simulation method for updating bank geometry during either degradational or aggradational bed evolution. The model is applied to a 180~ bend with a constant radius under unsteady flow conditions, and to Friedkin＇s laboratory meander channels. The results are in acceptable agreement with measurements, confirming the two dimensional model＇s potential in predicting the formation of river meandering and improving understanding of patterning processes. Future researches are needed to clarify some simplifications and limitations of the model.

关 键 词：River morphology Armored beds Non-tmiform sediment Bank erosion 2D numericalmodel 

分 类 号：TV143[水利工程—水力学及河流动力学]