Influences of slope gradient on soil erosion

The main factors influencing soil erosion include the net rain excess, the water depth, the velocity, the shear stress of overland flows, and the eros ion-resisting capacity of soil. The laws of these factors varying with the slope gradient were investigated by using the kinematic wave theory. Furthe rmore, the critical slope gradient of erosion was driven. The analysis show s that the critical slope gradient of soil erosion is dependent on grain si ze, soil bulk density, surface roughness, runoff length, net rain excess, a nd the friction coefficient of soil, etc. The critical slope gradient has b een estimated theoretically with its range between 41.5 degrees similar to 50 degrees.