不同坡长下的坡面流水力学特性研究

坡面流亦即薄层水流，指的是降雨或融雪形成的，并在重力作用下沿坡面流动的薄层水流，它是地表径流的初始阶段，提供了侵蚀的主要动力。坡度相同、降雨强度相同时，随着坡长的增加，流速逐渐增大。在相同降雨强度下．坡长对流速有一定的影响，二者呈良好的指数关系；流量随坡长的增长而逐渐增大，二者呈良好的幂函数关系。2m水槽基本能够反映出坡面流的水力学参数的变化。随着坡长的增加，相同流速下，雷诺数逐渐增大．且增长速度亦逐渐增大。

Study of overland flow hydraulic properties under different slope length

Overland flow that is,referring to the formation of rainfall or snowmelt, andunder gravity flow sheet flow along the slope,which is the initial stage of surface runoff,erosion provided the main driving force.The same slope,rainfall intensity is the same,with the slope length increases,the flow rate increases.In the same rainfall intensity,slope length have certain impact on the flow rate,the index showed a good relationshipbe- tween the two;traffic growth with the slope length increases,both showed goodpower function.2m sink can ba- sically reflect the overland flow hydraulics parameters.With the slope length increases,the same flow rate,the Reynolds number increases, and the growth rate is also gradually increasing.