不同降雨模式下石灰土坡地地表侵蚀特征

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.

Limestone soil transferring processes under different rainfall patterns

Limestone soil transferring processes were monitored under different simulated rainfall patterns.Results showed as follows.1） The maximum quantity of surface soil erosion was 1 201.86 g when the precipitation was 102 mm and rainfall intensity was 2.03 mm/min; underground soil erosion was 6.563 g when rainfall intensity was 0.37 mm/min.2） The quantity of surface soil erosion was at most 796.7 g when rainfall intensity varied from strong to weak with the same precipitation time of 90 min,but lasting flow soil erosion was 41.38 g and underground soil erosion was 4.923 g when rainfall intensity changed from weak to strong.3） The main factor which affects the quantity of surface soil erosion is the intensity of rainfall,while the factor which affects the lasting flow soil erosion is the later intensity of rainfall.The duration of rainfall determines the amount of underground soil erosion.