ZUO Chang-qing 1, 2, ZHANG Guo-hua 3
(1. China Institute of Water Resources and Hydropower Research, Beijing 100048, China; 2. Research Center on Soil and Water Conservation of the Ministry of Water Resources, Beijing 100048, China; 3. China Irrigation and Drainage Development Center, Beijing 100054, China)

Abstract: Based on the kinematic wave theory, a basic equation has been deduced to describe the runoff generation on a slope under the condition of natural rainfall with different rainfall intensities. The equation can be numerically solved by applying the Preissmann format. The feasibility of the model is verified by field experimental data. The maximum deviation between calculated results and experimental data is within +/-17%. Putting field testing rainfall information into the model set up in this paper, the processes of rainfall under different rainfall intensity condition were simulated, which indicated that the start of runoff yield time in the ground covered and apply covered by Bahia grass is obvious later than that in the bare ground, and the peak flow was less than that in the bare ground in evidence, making out that the measures by covering and apply covering with Bahia grass have significantly effect on reducing and suspending peak flow effect.

Key words: red soil slop; natural rainfall; model for runoff generation; numerical simulation; cover and apply cover

Published in: Journal of Hydraulic Engineering, Vol. 43, No. 4, 2012