Simulation Study of Runoff and Sediment Yield in a Small Karst Watershed Based on SWAT Model
In order to explore the characteristics of runoff and sediment yield in Karst watershed,this paper takes Yangjichong small watershed as the research area,and uses the measured hydrological data,DEM,land use data,meteorological data and soil data from 2015 to 2019 to establish SWAT model.The simulation results of runoff and sediment are simulated,and the characteristics of runoff and sediment yield in the watershed are analyzed.The results show that the numerical simulation of the SWAT model meets the evalua-tion criteria in both the rate period and the validation period,the simulation results are excellent,and the SWAT model has certain ap-plicability in the Karst watershed.There is a significant positive correlation between monthly rainfall and monthly runoff.Compared with rainfall,the annual change of runoff is more intense.The sediment yield is mainly concentrated in the rainy season.The monthly variation of sediment yield is greater than that of monthly runoff.It can provide reference for water resources management in Karst small watershed.
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