内昆铁路施工期不同下垫面土壤侵蚀模拟研究

Simulation Study on Soil Erosion of Different Underlaying Surface in Construction Period of Nei Kun Railway

工程措施所形成的各类人工地貌具有地表完全裸露、人为因素影响大等特征。在人工模拟降雨的基础上 ,对铁路施工期形成的各类人为地貌和原地面的土壤侵蚀产沙、产流规律以及影响因素进行了研究。结果表明 ,降雨历时和累积径流量、累积产沙量以及含沙率的关系非常密切 。

Artificial physiognomy formed by engineering measures had characters of completely bare surface and being disturbed by human activity obviously. On the bases of simulated rainfall, the rule of soil erosion, sediment and runoff yield, and influence factors of artificial physiognomy formed in construction period of railway and natural ground,were researched. The results showed that rainfall duration had a close relation to accumulated runoff, accumulated sediment yield, rate of sediment yield; at the same time, vegetative coverage,density of soil, and pre moisture in soil are main factors affecting yield sediment and runoff.