Characteristics of runoff generation and its numerical simulation of surface flow in hilly area with purple soil under convetional tillage systems

A throughflow collection system is established to investigate the process of runoff generation both for surface flow and subsurface flow.The results show that:1.under the condition of flurry,surface runoff will be generated and the lag phenomenon may happen to the flow peak if the soil is dry before the rain; 2.both surface runoff and throughflow commence under the condition of rainstorm and downpour; 3. under the condition of flurry and rainstorm,surface runoff is controlled primarily by infiltrationexcess runoff mechanism.The numerical simulation can be used to explore the general tendency of the surface runoff.