亚洲一区欧美在线,日韩欧美视频免费观看,色戒的三场床戏分别是在几段,欧美日韩国产在线人成

Benggang erosion is an important erosion type, which frequently occurs in Southeastern China. Colluvial deposits of Benggang is an important source of the Benggang sediment. Based on simulated rainfall experiments and three-dimensional (3D) laser scanning, the characteristics of spatial-temporal differentiation of soil erosion processes on the colluvial deposits of Benggang were investigated. An indoor rainfall experiment was conducted with a 30° slope of the Benggang deposit and a rainfall erosion intensity of 3.33mm/min, which represented a typically higher rain intensity in the study region. Rainfall simulation experiments were conducted in 2016 in the rainfall simulation hall of Laboratory of Red Soil Erosion and Flow Hydraulic in South China in Guangzhou City, Guangdong Province. The results showed that point cloud data from the 3D laser scanning can reflect the characteristics of soil erosion, deposition and sediment yield before and after rainfall events. Total amount of rill erosion，sheet erosion were 0.0366m3 and 0.1135m3, respectively. Slope position had little influence on sheet erosion, while it had a significant impact on rill erosion. Roughness of soil surface was increased first and then decreased with time during the experiment. The values of roughness of soil surface were in a descending sequence of lower slopes, middle slopes and upper slopes, and it varied with time at different slope positions. Roughness of soil surface on lower and middle slope was increased firstly and then decreased with time during the experiment, while it was increased constantly with time on the upper slope. No significant variation of soil erosion on upper slopes occurred with rainfall events. The soil erosion amount and sediment yield were decreased logarithmically with time. The difference of erosion amount between upper and lower slopes was significant, whereas slope positions showed insignificant influence on soil erosion and sediment yield.