论文部分内容阅读
采用人工模拟降雨的方法,研究不同降雨模式下石灰土坡地的地表侵蚀特征。结果表明:1)降雨总量为102mm,降雨强度为2.03 mm/min时,地表累积产沙量多达1 201.86 g,降雨强度为0.37 mm/min时,产生的地下土流失量最多为6.563 g;2)降雨时间均为90 min,降雨强度由强变弱时地表产沙量最多为796.7 g,降雨强度由弱变强时产生的延续产沙量最多为41.38 g,此时产生的地下土流失量仅为4.923 g;3)影响地表产沙量的主要因素是降雨强度,影响延续产沙量最显著的因子是降雨后期降雨强度,而降雨时间的长短决定了地下土流失量。
Artificial simulated rainfall method was used to study the characteristics of surface erosion of limestone slope under different rainfall patterns. The results show that: 1) when the total rainfall is 102mm and the rainfall intensity is 2.03mm / min, the accumulated sediment yield on the surface is as high as 1 201.86g. When the rainfall intensity is 0.37mm / min, the maximum amount of underground soil loss is 6.563g ; 2) the rainfall time is 90 min, the maximum surface sediment yield is 796.7 g when the rainfall intensity is weak, and the maximum sediment yield is 41.38 g when the rainfall intensity changes from weak to strong. At this time, the underground soil And the loss amount is only 4.923 g. 3) The main factor affecting the surface sediment yield is the rainfall intensity. The most significant factor affecting the continuous sediment yield is the rainfall intensity in the late rainfall, and the length of the rainfall determines the amount of underground soil loss.