水土保持学报2012，Vol.26Issue(1)：17-21,5.
砒砂岩陡坡面径流水动力学特征
Hydraulic Characteristics of Steep Slope Runoff of Pisha Sandstone
摘要
Abstract
In order to study erosion rule of slope runoff and provide scientific and theoretical basis for water erosion forecast model in Pisha sandstone region,the hydrodynamic characteristics of steep slope runoff under the different scouring flow discharges and slope gradients were studied in this paper by using indoor runoff scouring experiment.The results showed that flow velocity of steep slope runoff of Pisha sandstone increased with the increase of scouring flow discharges and slope gradients under the flow discharges and slope gradients of this experiment and there were the power function relationships among runoff velocity and scouring flow discharges and slope gradients.The Reynolds number（Re） of slope runoff increased with scouring flow discharges.The critical slope of changes of Re was 40° and Re was maximum at this point.The Froude number（Fr） of slope flow runoff had the opposite trends.The flow regimes were turbulent flow and supercritical flow when flow discharges was greater than 4 L/min and the flow regimes were all laminar flow and supercritical flow at other treatments.The Darcy-Weisbach drag coefficient（f） of slope runoff increased with scouring flow discharges.The critical slope of changes of f was 60° and f was maximum at this point.The drag coefficient had positive correlation with sediment transport rate.关键词
砒砂岩/坡面侵蚀/水动力学/冲刷试验Key words
Pisha sandstone/slope erosion/hydrodynamics/scouring experiment分类
农业科技引用本文复制引用
苏涛,张兴昌..砒砂岩陡坡面径流水动力学特征[J].水土保持学报,2012,26(1):17-21,5.基金项目
国家“973”计划项目 （）
