游荡型河流转化控制因素的二维数值模拟  

2D Numerical Simulation on Controlling Factor for Transformation of Wandering Channel

作　　者：肖毅[1] 杜梦[1] 邵学军[1] 

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

出　　处：《天津大学学报》2012年第9期845-850,共6页Journal of Tianjin University(Science and Technology)

基　　金：国家自然科学基金资助项目(50879042;50979043)

摘　　要：改进已有平面二维水沙模型,进一步考虑弯道二次流及河床结构对泥沙输运的影响以及河岸植被影响;并提出新的非黏性土崩岸模拟方法,使其能模拟边滩的形成.利用改进后模型模拟游荡小河的形成,并在此基础上通过模拟流量、边岸植被、来沙量等控制因素变化后游荡小河的平面形态发展过程;分析讨论其对游荡河型转化的影响,并将结论与现有河型转化理论对比,说明改进后的数值模型能反映游荡河流的形成与转化,为深入研究其转化及成因机理提供新的技术手段.An improved 2D hydrodynamic and sediment transport numerical model was established in this paper.Effects of secondary flow and bed structure on sediment transport and bank vegetation are taken account to the 2D numerical model.A simple new simulation method including the influence of river bend was adopted in the non-cohesive bank erosion,so that it was capable of simulating the evolution of sand bars.Conceptual braided channels and their transformation processes are simulated in four numerical tests with changes for water discharge,incoming sediment and bank vegetation effects;predictions with different control factors are discussed and the results agree well with classic theories of channel patterns.It illustrates the capability of the two dimensional models in predicting the formation and transformation of braided channels and improving understanding of patterning processes in future.

关 键 词：游荡型河流 平面二维模型 河型转化 水沙条件 植被影响 

分 类 号：TV147[水利工程—水力学及河流动力学]