基于河道平面变形数值模拟的等效造槽流量计算方法  

Equivalent dominant discharge based on numerical simulation of planform changes in alluvial rivers with bank erosion

作　　者：假冬冬[1,2] 邵学军[2] 肖毅[2] 周刚[3] 

机构地区：[1]南京水利科学研究院,南京210029 [2]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 [3]中国环境科学研究院河流与河口海岸带环境创新基地,北京100012

出　　处：《水力发电学报》2011年第1期78-83,88,共7页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金资助项目(5087904250779038);国家科技支撑计划资助项目(2006BAB05B03)

摘　　要：针对河岸崩塌剧烈、河道平面变形特征显著的冲积河流,从河岸变形角度提出等效造槽流量(造床流量)的计算方法。以等效造槽流量作为计算条件,成功应用于下荆江石首河段平面变形的三维水沙数值模拟中,结果表明:采用等效造槽流量近似天然水沙过程,能较好地模拟出时段内河道的显著平面变形特征,与天然来水来沙过程模拟结果较接近;采用等效造槽流量作为计算条件时,其最大优势在于节省计算用时,提高计算效率,为长河段、长历时的河势模拟研究提供了一有效途径。A calculation method of equivalent dominant discharge（EDD） was proposed for alluvial rivers subject to significant planform changes due to bank erosion.A 3-D mathematical model was adopted to simulate the planform changes in the Shishou reach of Yangtze River under different inlet conditions of flow and sediment load in the period of 1996-1998.Results show a good agreement between the planform changes simulated by specifying the natural flow and sediment conditions at the inlet and by specifying EDD that greatly reduces the computational cost.This implies that the EDD method may be used in three-dimensional modeling of long-term fluvial processes in the case of limited computer resources.

关 键 词：河流动力学 造床流量 平面变形 三维水沙数值模拟 河床演变 河岸崩塌 

分 类 号：TV147[水利工程—水力学及河流动力学]