Analysis of the spatiotemporal distribution of runoff erosion power and its relationship with sediment transport in the Kaijiang River Basin of the Upper Yangtze River
Soil and water loss is the primary ecological environment problem in the Upper Yangtze River.It is crucial to accurately grasp the laws and development trends of regional soil and water loss.Based on SWAT model and runoff erosion power theory,the temporal and spatial distribution characteristics of runoff erosion power and its relationship with sediment transport in the Kaijiang River,a typical basin in the region,have been analyzed.The results show that the runoff simulation results basically meet R2＞0.85,NSE＞0.75,PBIAS＜±15％in the calibration and validation periods.From 2009 to 2018,the interannual variation of runoff erosion power is large,especially on the primary tributaries,while on the multi-year scale,the runoff erosion power in the main stream and tributaries shows the spatial distribution characteristics of'large upstream and small downstream'.In addition,the comparative analysis of various water-sediment relationships shows that the power function relationship between sediment transport modulus and runoff erosion power is relatively opti-mal,which provides a theoretical basis for scientific management of soil erosion and accurate prediction of sed-iment transport.
Upper Yangtze Riverrunoff erosion powerspatial and temporal distributionSWAT modelwater-sediment relationship
万方数据
维普
