Critical topographic condition for slope erosion in Hilly-gully region of Loess Plateau
LIAO Xi-Shan-；Ca-Jiang-Guo-；Cheng-Qin-Juan
1.College of Resources and Environment,Huazhong Agricultural University,430070,Wuhan;2.Key Laboratory of Water Cycle and Related Land Surface Processes,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,100101,Beijing;3.Graduate School of Chinese Academy of Sciences,100039,Beijing: China
Abstract：This paper tries to explain the effects of slope gradient,slope length and rainfall on slope erosion from the viewpoint of energy.Analyzing data about slope gradient,slope length and rainfall observed at Ansai station in Shanxi Province and Wangjiagou small watershed in Lishi,west of Shanxi Province,the author aims to know the influences of rainfall,slope gradient and slope length on slope erosion.The result shows that the influence of rainfall on slope erosion amount is the biggest,slope gradient is the second,and slope length is the smallest. Critical slope gradient is influenced by factors of rainfall and slope length,and critical slope length is influenced by factors of rainfall,slope gradient and slope length.Critical slope gradient or slope length is not a constant value,which varies in some ranges and depends on the factors of rainfall,slope type.The results provided the scientific theory basis for slope erosion control in the Hilly-gully region of Loess Plateau.
2008, Vol. 6 
