红壤坡地降雨产流的数学模拟及其过程分析

本文采用一维运动波理论建立了自然降雨下红壤坡地产流模型，应用Preissmann隐式格式对模型进行了数值求解，通过实测资料进行验证，计算值与实测值的相对误差最大不超过17%，说明该模型是合理的，可以描述不同雨型下不同水土保持措施的红壤坡地产流规律。将试验实测的降雨过程输入到本文建立的模型中计算，得到不同雨型下的产流过程。通过分析表明：百喜草覆盖与敷盖措施的起始产流时间明显滞后于裸露地，而洪峰流量也明显小于裸露地，说明百喜草覆盖与敷盖措施都有明显的削峰滞后作用。

Numerical simulation of runoff generation on red soil slope under the condition of natural rainfall and its process analysis

Based on the one-dimensional kinematic wave theoretic the basic equation for describing the runoff generated on a slope under the condition of natural rainfall with different rainfall intensities, the rule of runoff yield on red soil slop for different soil and water conservation measures under condition is deduced. The equation can be numerically solved by applying the Preissmann format. The feasibility of the model is verified by filed experimental data. The maximum deviation between calculation result and experimental data is about ±15%. Putting field testing rainfall information into the model set up in this paper, the processes of rainfall under different rainfall intensity condition is 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 reducing and suspending peak flow effect.