考虑水流紊动的丁坝下游回流区水流挟沙力研究  

Sediment Carrying Capacity Downstream of the Spur Dike in Open Channel Flow

作　　者：杨静[1] 张潆元[1] 冯金朝[1] 刘裕明[1] 

机构地区：[1]中央民族大学生命与环境科学学院,北京100081

出　　处：《中央民族大学学报（自然科学版）》2016年第2期53-57,共5页Journal of Minzu University of China(Natural Sciences Edition)

基　　金：国家自然科学基金项目(No.51209239;51579151)

摘　　要：研究复杂流态下丁坝回流区水流挟沙力的变化规律,对于优化丁坝设置具有重要的意义.基于丁坝水流紊动实验所得主流区、回流正流区和回流负流区的水流紊动强度,利用水流切应力和流速的关系,建立了考虑水流紊动强度的丁坝回流区水流挟沙力公式.利用此公式解释丁坝后的淤积现象、三峡永久船闸上引航道口门区淤积以及桥墩后部漩涡冲刷现象,并给出不同紊动强度下主流区、正流区和负流区不淤流速.公式可用于回流河段泥沙数值模型中.The sediment capacity is greatly influenced by the turbulence intensity downstream of the spur dike. Based turbulence intensity resulting from the physical model,and the equation of shear stress and water velocity derived from kinetic equation,the sediment carrying capacity equation is established,in which the turbulence is also considered. By this equation,the fluvial process in the backflow region can be found,the critical fluvial velocity under different turbulence intensity is also given. Last but the most important,this equation can be used in the sediment fluvial simulation model which based on sediment carrying capacity equation.

关 键 词：泥沙动力学 挟沙力 丁坝 水流紊动 

分 类 号：TV142[水利工程—水力学及河流动力学]