Research of Rill Erosion Model and Critical Slope Gradient during Rainfall
We analyze the effective factors of slope erosion and establishes slope rill erosion model during rainfall,by using hydraulics calculation formula.It gets the critical water depth conditions of slope erosion after an-alyzing the incipient motion of loose granular and clod on the slope.After the discussion of the influence factors of erosion rate,we draw conclusions that slope erosion ability improves with increasing of slope gradient when it is greater than zero.And if it is less than zero,that anti-erosion ability improves firstly,and decreases afterwards. There is a critical slope gradient (θm )from 7°to 24°,influenced by internal friction angle significantly,increasing with increasing of internal friction angle.We can divide slope into three stages with the intensities of strong erosion, stable erosion,and weak erosion,according to erosion rate,erosion pattern and critical slope gradient.Meanwhile, it explains the phenomenon of slope evolution from the viewpoint of mechanics.
国家科技期刊平台
NSTL
万方数据
维普
