Study on Response of Runoff and Sediment with Rainfall Characteristics on Grass-growing Slope in the Red Soil Region
Rainfall is an important factor that affecting soil and water loss on slopes,and grass growing is a common measure to control soil and water loss on slopes.In order to explore the characteristics of runoff and sediment on grass-growing slopes in red soil region under different rainfall types,based on 136 effective rainfall data from January 2016 to December 2021 in Jinshan Soil and Water Conservation Research Center in Fuzhou Municipality,combining with runoff-soil erosion datum,it was analyzed the response relationship between runoff and sediment on slope with the different rainfall characteristics.The results showed that the types of rainfall could be divided into three types:type A(long duration,large rainfall and heavy rainfall intensity),type B(short duration,small rainfall and heavy rainfall)and type C(medium duration,small rainfall and small rainfall intensity).Among them,type C rainfall was the main source of runoff and sediment on the slope.Under different rainfall types and the total level of inter-annual rainfall,grass-growing slopes effectively reduced soil erosion.Compared with pure-ploughing slopes,the average runoff of grass-growing slopes under three types of rainfall were decreased by 59.03％,64.98％and 67.05％,respectively,and the average erosion were decreased by 96.91％,73.95％and 88.14％,respectively.The main rainfall characteristics factors affecting runoff and sediment of grass-growing slope in red soil area were rainfall,maximum rainfall intensity of 30 min and rainfall erosivity.The study can provide a reference basis for the control of slope soil and water loss and the selection of soil and water conservation measures in red soil area.
万方数据
维普
