Comparative study on the methods of estimating land surface evaporation in Dawenhe River basin
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Abstract:
The estimation of regional land surface evapotranspiration is of great significance to calculate the total amount of regional water resources and to allocate water resources reasonably. According to the characteristics of the sub river basins controlled by Xueye reservoir, Huangqian reservoir and Dongzhou reservoir in Dawenhe River basin, respectively using MODIS remote sensing method, SWAT model and conversion coefficient of water surface evaporation to estimate the average yearly and monthly land surface evaporation of the three sub basins from 2000 to 2008. Based on the rainfall and natural runoff data of each sub basin over the same period, the estimated results are analyzed and compared. The results show that: in Dawenhe River basin, the accuracy of the MODIS remote sensing method is low; the conversion coefficient method has a certain precision; the SWAT model method has higher calculation precision and better adaptability, and the estimation error is only about 3%. The results provide references for selecting good methods of estimating the land surface evaporation in the semi humid region.
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