水流作用下沙漠风积沙冲刷速率二维模型探析

Discussion on two-dimensional model of desert aeolian sand erosion ratio under water flow action

根据集中水流下沙漠风积沙的冲刷破坏过程和机理,以表面水流单宽流量来模拟水流条件,下游端部的初始落差来模拟沙漠土的跌坎地形,下游端部跌坎位置随时间的变化率,来确定溯源冲刷速度和表面剥蚀速率。对沙漠风积沙冲刷速率的影响因素进行分析,建立了集中水流作用下沙漠风积沙冲刷速率二维模型。

Based on the erosion destruction process and mechanism of desert aeolian sand under the concentrated flow, the discharge per unit width of surface layer flow is used to simulate the water flow conditions and the initial fall of the end of the lower reaches is used to simulate the sill drop terrain of desert soil, the rate of change over time for the sill drop position of the end of the lower reaches could determine the traceability erosion velocity and surface erosion ratio. The influence factors of erosion ration of desert aeolian sand are analyzed and the two-dimensional model of desert aeolian sand erosion ratio under concentrated flow is established.