典型黄土坡面天然草地产流产沙规律试验

通过野外模拟降雨试验,研究黄土区天然草坡的产流、产沙规律。试验设2个地类(草地和裸地)、3个降雨强度水平和3个坡度水平。结果表明:坡面初始产流时间与降雨强度呈负相关关系,与裸地相比,草地在降雨强度较大时(>2.0 mm/min)加快坡面产流,在中(1.0~2.0 mm/min)、小等级降雨强度(<1.0 mm/min)下则延缓产流;降雨强度较大时,裸地大坡度的产流强度随时间呈对数函数形式增长,中小等级降雨强度下的增长方式不符合这一规律;与中、小等级降雨强度不同,裸地在降雨强度较大时的产流产沙过程不一致;与裸地相比,草地的产流过程更为复杂,并不符合产流强度随时间呈对数函数形式增长的一般规律,草地产沙过程线与产流过程线的相对吻合程度受降雨强度的影响不明显。

The paper studied the runoff generation and sediment yield regulations of the natural slope-green-land in loess zone by the simulated rainfall.There were two land types(grass land and bare land),three types of rainfall intensity and slope.The research results showed that: there was negative correlation between the original runoff generation time and the rainfall intensity.Compared with the bare land,the heavy rainfall intensity(>2.0 mm/min) accelerated the runoff generation in the green land,while the me...