砒砂岩区水力侵蚀下坡面微地貌变化特征及过程研究

解决砒砂岩区坡面的产流产沙问题对黄河流域生态安全具有重要意义,选取砒砂岩裸露坡面为研究对象,在自然降雨条件下采用野外径流小区实测结合三维激光扫描技术,分析13次有效降雨过程砒砂岩坡面微地貌的变化过程及产流产沙特征.结果表明,径流小区内坡面土壤平均侵蚀深度为26 mm,侵蚀区占径流小区总面积的95.27％,单位面积上侵蚀...

Micro-geomorphic Change Characteristics and Process of Slope Under Water Erosion in Pisha Sandstone Area

The bare slope of Pisha Sandstone was collected as the research object, the field runoff plot measurement and three-dimensional laser scanning technology were used to analyze the micro geomorphic change process and runoff and sediment yield characteristics of 13 effective rainfall processes. The results showed that the average soil erosion depth was 0.026m, and the erosion area accounted for 95.27% of the total runoff area. The volume of soil loss caused by erosion was 0.1932m3, and the net volume of soil loss was 0.1911m3. Runoff and sediment yield of Pisha Sandstone slope had a good corresponding relationship with rainfall intensity. Rainfall intensity and rainfall were the main factors affecting runoff and sediment yield. Influenced by the change of rainfall intensity, the micro topography of slope increased and decreased; there was a good positive correlation between runoff and sediment yield (P < 0.05), and the correlation coefficient was 0.539.