摘要
随着降雨击溅及坡面径流的持续冲刷,坡面侵蚀将由面蚀向沟蚀转化,并形成复杂的坡面微地形,坡面微地形又将改变坡面侵蚀方式。通过降雨及直接径流冲刷条件下的坡面侵蚀试验,研究了坡面侵蚀过程和冲刷流速(量)、侵蚀率与坡面微地形分形特征之间的关系,结果表明:侵蚀坡面地形分维值与冲刷流量和坡度存在明显的相关关系,把流速和坡面侵蚀率作为坡面地形演变的直接指标,均存在分维值随其先增大后减小的规律。
Along with rainfall splash and continuous scour of slope runoff,the slope erosion will turn surface erosion into channel erosion,forming complicated slope micro-topography and changing the way of erosion.The paper studies the process of slope erosion,velocity and quantity of scour and the relationship of erosion ratio and characteristic of slope micro-topography shaping through the tests of slope erosion under the conditions of rainfall and direct runoff scour.The outcomes show that the shaping dimension value of eroded slope topography has obvious correlations between scour discharge and gradient and;the dimension has the rule of increasing first and decreasing later if taking velocity and slope erosion rate as the direct index of topographic evolution of slope.
出处
《人民黄河》
CAS
北大核心
2008年第12期90-92,共3页
Yellow River
基金
水利部黄河泥沙重点实验室2007年度开放课题(2007003)
中国博士后科学基金资助项目(20070410253)
华北水利水电学院高层次人才科研启动项目(200805)
关键词
土壤侵蚀
坡面
沟蚀
流速
坡度
分形
soil erosion
slope surface
ditch erosion
velocity
gradient
shaping
