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Application of Spatially Distributed Calibrated Hydrological Model in Evapotranspiration Simulation of Three Gorges Reservoir Area of China:A Case Study in the madu river basin

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Chinese Geographical Science 2022年第6期32卷 1083-1098页

作者： CHEN Junhong ZHANG Lihua CHEN Peipei MA Yongming School of Geography and Information Engineering China University of GeosciencesWuhan 430074China Hubei Key Laboratory of Critical Zone Evolution School of Geography and Information EngineeringChina University of GeosciencesWuhan 430074China School of Geography and Tourism Zhaotong UniversityZhaotong657000China

Evapotranspiration(ET)is the key to the water cycle process and an important factor for studying near-surface water and heat *** estimating ET is significant for hydrology,meteorology,ecology,agriculture,etc..This paper simulates ET in the madu river basin of Three Gorges Reservoir Area of China during 2009-2018 based on the Soil and Water Assessment Tool(SWAT)model,which was calibrated and validated using the MODIS(Moderate-resolution Imaging Spectroradiometer)/Terra Net ET 8-Day L4 Global 500 m SIN Grid(MOD16A2)dataset and measured *** calibration strategies(lumped calibration(LC)and spatially distributed calibration(SDC))were *** basin was divided into 34 sub-basins,and the coefficient of determination(R^(2))and NashSutcliffe efficiency coefficient(NSE)of each sub-basin were greater than 0.6 in both the calibration and validation *** R2 and NSE were higher in the validation period than those in the calibration *** with the measured ET,the accuracy of the model on the daily scale is:R^(2)=0.704 and NSE=0.759(SDC results).The model simulation accuracy of LC and SDC for the sub-basin scale was R^(2)=0.857,R^(2)=0.862(monthly)and R^(2)=0.227,R^(2)=0.404(annually),respectively;for the whole basin scale was R^(2)=0.902,R^(2)=0.900(monthly)and R^(2)=0.507 and R^(2)=0.519(annually),*** model performed acceptably,and SDC performed the best,indicating that remote sensing data can be used for SWAT model *** 2009-2018,ET generally increased in the madu river basin(SDC results,7.21 mm/yr),with a multiyear average value of 734.37 mm/*** annual ET change rate for the sub-basin was relatively low upstream and *** linear correlation analysis between ET and meteorological factors shows that on the monthly scale,precipitation,solar radiation and daily maximum and minimum temperature were significantly correlated with ET;annually,solar radiation and wind speed had a moderate correlation with ***

关键词： soil and water assessment tool distributed simulation for evapotranspiration model calibration remote sensing evapotranspiration products madu river basin

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