红壤开挖面坡面径流特征研究

A study on runoff characteristics of red soil slope land

为了研究坡面径流特征,采用上方人工放水实验模拟坡面水流,研究不同放水流量强度、不同坡长及不同坡度条件下红壤坡面径流过程特征.结果表明:(1)不同放水流量强度条件下,坡面径流率随径流历时的变化总体上呈先逐渐增大,后趋于稳定的变化过程,且放水流量强度越小,坡面径流率的增长速度反而越大;(2)不同坡长条件下,坡面径流率随径流历时的变化过程总体上先逐渐增大,后趋于稳定,且随坡长的增大,坡面径流率越小;(3)不同坡度条件下,坡面径流率随径流历时大部分先逐渐增大,后趋于稳定,对于两个较陡坡(50°和65°)且放水流量较大的坡面,坡面径流率随历时先逐渐减小,后趋于稳定.

In order to study the characteristics of slope runoff of red soil,this paper conducts artificial drainage experiments to simulate the slope runoff under different water flow intensity,slope length and gra-dient. The results show that：（1）under the condition of different water flow intensity,the runoff rate in-creases in the beginning but becomes stable later. The growth rate is greater when the flow becomes smal-ler;（2）under the condition of different slope length,the rate changing shows the same tendency,but the figure is smaller when the slope length becomes longer;（3）the same changing pattern is also found in most time under the condition of different slope,but exception is observed in two more steep slopes（50＆#176; and 65＆#176;）where the pattern is decreasing first before stabilization.