水土保持学报2018，Vol.32Issue(1)：116-120,5.DOI:10.13870/j.cnki.stbcxb.2018.01.019
砾石覆盖条件下盐碱土边坡降雨侵蚀水动力学特征
Hydrodynamic Characteristics of Rainfall Runoff on Saline-alkali Slope Covered by Gravel
摘要
Abstract
A series of simulated rainfall experiments were conducted to investigate the reducing effect of gravel cover on erosion of saline slope.The effects of gravel coverage on hydrodynamic characteristics of runoff and unit sediment load were analyzed under different slope gradients (15°and 30°) and rainfall intensities (92 and 119 mm/h).The cover rates of gravel were 0,10 ％,20％,40％,60％ and 80％,respectively.The flow rate was measured by dyeing tracer method.Unit sediment load increased first and decreased then with the increasing of gravel coverage under different slopes and rain intensities.The changing tendency of Reynolds number and Froude number versus gravel coverage was determined by parabola curve.Manning roughness,Dracy-Weisbach resistance coefficient,the stream average shear force and the stream power had positive liner relationship with the gravel coverage.The stream power predicted sediment load rate well,and these two were logarithmic (R2 =0.47).关键词
砾石覆盖/模拟降雨试验/水动力学参数/坡面侵蚀Key words
gravel coverage/simulated rainfall experiment/hydrodynamic parameters/slope erosion分类
农业科技引用本文复制引用
陈心逸,李丽,佘冬立..砾石覆盖条件下盐碱土边坡降雨侵蚀水动力学特征[J].水土保持学报,2018,32(1):116-120,5.基金项目
国家自然科学基金项目(51679062,41471180) （51679062,41471180）
江苏省国土科技项目(KJXM2017032) （KJXM2017032）
江苏省青篮工程支持计划项目 （）
江苏高校优势学科建设工程项目(PAPD) （PAPD）
