Flow velocity and processes of runoff and sediment generation on soils containing gravels
TUN Bing-； Shu-Yuan-Jun-； Shao-Meng-An
1.College of Resources and Environment,Northwest A & F University;2.Institute of Soil and Water Conservation,Northwest A & F University;3.Institute of Soil and Water Conservation,Chinese Academy of Sciences & Ministry of Water Resources: 712100,Yangling,Shaanxi,China
Abstract：In this study,the flow velocity and the processes of runoff and sediment generations along the slopes for five soils(gravel mass contents were 0,10%,20%,30%,and 40% respectively) were investigated under rainfall simulation experiments in order to understand the soil and water loss process on the soil containing gravels.The results indicated that the flow velocity for soil containing gravels was larger than the soil without gravels.During the initial 0-10 min of the rainfall,sediment yields on the soils with gravels increased sharply with time and the peak period of sediment generations appeared around 10 min.Then,sediment yields decreased gradually.At the later stage of the rainfall(30-60 min),the sediment yields for the soils with gravels increased again especially for the soils with 30% and 40% gravel contents their sediment yields enhanced significantly and fluctuated with time.In the experiments,the total sediments yield was positively linked to the gravel content in the soil and the sediment concentration was positively linearly related to the sediment yield.
2011, Vol. 9 
