基于改进通用土壤侵蚀方程的水土流失时空模拟——以淮河上游为例

Temporal-spatial simulation of soil and water loss based on improved Universal Soil Loss Equation: case of upstream of Huaihe River

淮河流域上游区域水土流失较为严重,需要准确预测与分析该区域水土流失情况,以制定相应的治理规划。引入考虑地表径流深的改进通用土壤侵蚀方程,模拟了淮河上游息县水文站以上区域2000~2010年水土流失时空分布。结果表明,改进的通用土壤侵蚀方程模拟的输沙量满足规范要求,相比于传统方程,相对误差减少,模拟的含沙量过程确定性系数提高,对淮河上游的水土流失模拟精度更高;研究流域土壤侵蚀模数整体上呈现西大南北偏小的分布规律,研究成果可为淮河上游区域水土流失治理提供参考。

The soil and water loss in the upstream of Huaihe River is serious, so it is necessary to forecast and analyze the soil and water loss in the basin correctly to make corresponding harnessing plan. Based on the improved Universal Soil Loss Equation that considers the hydrological factor of surface runoff, the temporal and spatial distribution of soil and water loss of upstream area from 2000 to 2010 was simulated. The results show that the sediment load simulated by the improved Universal Soil Loss Equation meets the requirement of the standard ; compared with the traditional Universal Soil Loss Equation, the relative error of the improved equation is reduced and the certainty coefficient in sediment transport process is improved, which is more accurate for the simulation of soil and water loss in the upper Huaihe River; the soil erosion modulus is larger in the western basin while smaller in the northern and southern basin. The research results can provide reference for the soil and water loss control in the upper reaches of Huaihe River Basin.