Numerical Simulation of Runoff and Sediment Transport Processes under Different Restoration Patterns for Degraded Land
Aiming at the fact of severe soil degradation and the complicity of simulating soil erosion process after land optimization and recuperation, a simplified coupled model simulating runoff and sediment yield on different restoration lands was proposed based on the kinetic wave equation and sediment transport formula. Then the process of soil erosion and the distribution of sediment transport rate along the slope length under different rainfall intensities and slopes were modeled after verification. The verification results showed the model could overall reflect the average change of runoff and sediment transport process on different restoration lands. And the simulation results showed the runoff and sediment yield on fallow land were significantly higher than that on grassland and the change of runoff and sediment yield was consistent with rainfall process on both lands under natural conditions. The starting time of runoff was later while the end time was earlier on grassland compared to that on the fallow one. The sediment transport rate per unit width was significantly lower on grassland than that on follow land, which was increased with the rainfall intensity and slope increasing, and the effect of rainfall intensity on sediment transport rate was larger than that of slope. The stronger the rainfall intensity was, the smaller the effect of grass on reducing sediment yield was. The results above provided technique and theoretical support for the optimized repair methods.
land restoration patterns generation of runoff and sediment sediment transport per unit width
ZHAO Chun-hong GAO Jian-en JU Wei
Northwest A&F University, College of Resources and Environment Institute of Soil and Water Conservat Northwest A&F University, College of Resources and Environment Institute of Soil and Water Conservat
国际会议
西安
英文
309-314
2010-10-11（万方平台首次上网日期，不代表论文的发表时间）