Total amount of soil erosion in the Malian River Basin was calculated based on the information of silt retention dam and sediment transport in the basin.With the systematic collection of data such as rainfall,soil,and remote sensing images in the basin,the differential characteristics and changes in soil erosion in the Malian River Basin were studied via the RUSLE model,and the model calculation errors analyzed.The results showed that the overall trend of soil erosion and sediment yield in the watershed was decreasing year by year,with a sudden change occurring in 2003 and reaching a minimum value of 1.91 1×107 t in 2011,with a multi-year average of 6.405×107t,and an average annual change rate of-4.824× 106 t/a.The amount of sediment deposition has been increasing year by year since 2003,account-ing for 10％-20％of the total annual soil erosion since 2010.In general,the grade distribution of soil erosion in the northern region is higher than that in the southern region.In most years,the grade of soil erosion in the eastern region was the lowest,and the soil erosion modulus basically remained below 2 500 t/(km2·a);after 2003,the soil erosion level in various regions of the watershed has decreased,and by 2018,the soil erosion modulus in the vast majority of regions decreased by over 200 t/(km2·a).The overall simulation results of the RUSLE model are good,and the relative error of erosion and sed-iment yield simulation in most years is controlled within 20％.
soil erosionRUSLE modelsimulation errorMalian River Basin
维普
万方数据
