Volume 4 Issue 1
Mar.  2011
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Xiao-chun ZHANG, Jing-wei WU, Hua-yi WU, Yong LI. 2011: Simplified SEBAL method for estimating vast areal evapotranspiration with MODIS data. Water Science and Engineering, 4(1): 24-35. doi: 10.3882/j.issn.1674-2370.2011.01.003
Citation: Xiao-chun ZHANG, Jing-wei WU, Hua-yi WU, Yong LI. 2011: Simplified SEBAL method for estimating vast areal evapotranspiration with MODIS data. Water Science and Engineering, 4(1): 24-35. doi: 10.3882/j.issn.1674-2370.2011.01.003

Simplified SEBAL method for estimating vast areal evapotranspiration with MODIS data

doi: 10.3882/j.issn.1674-2370.2011.01.003
Funds:  This work was supported by the National Natural Science Foundation of China (Grant No. 50809050) and the Fundamental Research Funds for the Central Universities (Grant No. 2101024).
More Information
  • Corresponding author: Jing-wei WU
  • Received Date: 2010-09-09
  • Rev Recd Date: 2010-11-02
  • The SEBAL (surface energy balance algorithm for land) model provides an efficient tool for estimating the spatial distribution of evapotranspiration, and performs a simple adjustment procedure to calculate sensible heat flux using the wind speed data set from only one weather station. This paper proposes a simplified method to modify the traditional SEBAL model for calculating the 24-hour evapotranspiration ( ) in the Haihe Basin with data from 34 weather stations. We interpolated the wind speeds using the inverse distance weighting method to establish a wind field and then used it to calculate the friction velocity directly. This process also simplifies the iterative computation process of sensible heat flux. To validate the feasibility of this simplified method, we compared the results with those obtained with an appropriate but more complex method proposed by Tasumi, which separates a vast area into several sub-areas based on the weather conditions, and runs the SEBAL model separately in each sub-area. The results show good agreement between the evapotranspiration generated by the two methods, with a coefficient of determination (r2) of 0.966, which indicates the feasibility of estimating evapotranspiration over a large region with the simplified method.   

     

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