Abstract:

Soil detachment is the necessary approach and the most important process of soil erosion sediment yield.A precise prediction of this is significant to the development of physical based erosion model.Based on runoff scouring experiments by a hydraulic flume,the relationship of red soil detachment rate and slope,flow rate,shear stress,stream power and unit stream power were researched under different slope gradients（88%～466%）and runoff discharges （02～10 L/s）in this paper.The experimental results showed that soil detachment rates would be predicted by a power function of flow rate and slope（〖WTBX〗R〖WTBZ〗2=0966).Among shear stress,stream power and unit stream power,all of them were a linear relation with soil detachment rate(〖WTBX〗R〖WTBZ〗2 is 0949、0965 and 0848),and stream power was best related to soil detachment rate.The results indicated that describing the equation type of red soil detachment rate were considered the same to previous studies，however,the characterization of soil erodibility coefficient showed significant difference.