红壤开挖面坡面径流特征研究

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.

A study on runoff characteristics of red soil slope land

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.