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沙质河床二维粗化数值模拟初探
引用本文:甘明辉,杨国录,吴虹娟,余明辉,谢翠松,袁雄燕.沙质河床二维粗化数值模拟初探[J].水动力学研究与进展(A辑),2002,17(6):691-700.
作者姓名:甘明辉  杨国录  吴虹娟  余明辉  谢翠松  袁雄燕
作者单位:武汉大学水利水电学院,湖北武汉,430072
基金项目:国家重大自然科学基金资助项目 (5 0 0 996 2 0 )
摘    要:沙质河床冲刷过程中河床变形、冲刷深度、悬移质含沙量恢复及床面级配等沿时空的变化与河床粗化紧密相关,只要对河床粗化机理和特性有较深认识才会对河床冲刷现象有较好的定量模拟。本文依据ADI算化原理,在交错网格上建立了非耦合非均匀不平衡输沙的平面二维非均匀沙水流挟沙力的计算方法和混合层计算模式。依据该模型所做的数值实验表明,模型能从定性上较好地模拟上述因素随时间沿纵横方向的变化,具有二维性,从理论和实践上进一步反映了数学模型能模拟河床冲刷过程中诸因素变化规律的潜力,并充分表明,正确预测冲刷河床变形的关系在于较好地模拟河床组成的粗化过程,对此,均匀沙模型是无能为力的。

关 键 词:交错网络  非均匀沙  床沙粗化  混合层
文章编号:1000-4874(2002)06-0691-10
修稿时间:2001年8月4日

Numerical simulation of 2-D coarsening of bed during riverbed erosion
GAN Ming hui,YANG Guo lu,WU Hong juan,YU Ming hui,XIE Cui song,YUAN Xiong yan.Numerical simulation of 2-D coarsening of bed during riverbed erosion[J].Journal of Hydrodynamics,2002,17(6):691-700.
Authors:GAN Ming hui  YANG Guo lu  WU Hong juan  YU Ming hui  XIE Cui song  YUAN Xiong yan
Abstract:A 2 D flow field model based on alternating direction implicit scheme with staggered grid and a sediment mathematical model were introduced for unsteady flow and non equilibrium sediment transportation combined with sediment movement equation. The mixed layer mode was used and uneven sediment was chosen in calculating riverbed deformation, erosion depth, sediment quantity and bed material grading during riverbed erosion. Numerical computation shows that the model can simulate the change in the above factors in the vertical and trasverse directions and thus has two dimentional characteristics.
Keywords:staggered grid  uneven sediment  coarsening of bed  mixed layer
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