摘要
为研究河型转化过程机理,建立了考虑弯道二次流影响与边岸崩塌过程的平面二维河流数学模型,包括水流模型、泥沙模型和边岸崩塌模型。通过在水流动量守恒方程中增加弥散应力项以考虑弯道二次流的影响,并采用室内水槽实验结果对水流模型进行了验证;利用上荆江沙市至石首天然长河段的水沙过程和河道演变资料,对泥沙模型进行了验证;结果表明本模型数值计算量合适,有较好的适应范围。模型中提出了边岸崩塌过程的模拟技术,相对于传统平面二维水沙模型而言,可以更好地模拟天然河道的横向摆动以及洲滩消长过程。
In this paper,an improved two dimensional（2-D） numerical model for river flow,sediment transport and bank erosion is presented and applied to study the mechanism of channel pattern changes.The effect of secondary flow at river bends is taken into account in the 2-D model by adding a dispersion stress term in the momentum conservation equation of river flow.The 2-D model simulations were compared with the laboratory experiments conducted in a curved flume,as well as with the field measurements from a long river section between Shashi and Shishou in the upper Jingjiang Reach of the Yangtze River.The laboratory comparison result reveals that the 2-D model in simulating the bank failure calculation is improved in comparison with other commonly used methods.The results also show that the 2-D model is able to simulate the field measurement.The improved 2-D model is relatively simple,easy to use,more reliable,and can be better to simulate fluvial processes in natural river channels compared to classical methods.
出处
《水科学进展》
EI
CAS
CSCD
北大核心
2010年第2期145-152,共8页
Advances in Water Science
基金
国家自然科学基金资助项目(50879042)
"十一五"国家科技支撑计划资助项目(2006BAB05B03)~~
关键词
河型转化
河流数学模型
二次流
崩岸过程
悬移质
推移质
channel pattern changes
numerical model
secondary flow
bank failure processes
suspended load
bed load
