Water Science and Engineering 2011, 4(1) 24-35 DOI:   10.3882/j.issn.1674-2370.2011.01.003  ISSN: 1674-2370 CN: 32-1785/TV

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SEBAL model
remote sensing
sensible heat flux
Haihe Basin  
ZHANG Xiao-Chun
Article by Zhang,X.C

Simplified SEBAL method for estimating vast areal evapotranspiration with MODIS data

Xiao-chun ZHANG1, 2, Jing-wei WU*2, Hua-yi WU1, Yong LI3

1. State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, P. R. China
2. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University,   Wuhan 430070, P. R. China
3. School of Earth Sciences and Engineering, Hohai University, Nanjing 210098, P. R. China


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.   

Keywords evapotranspiration   SEBAL model   MODIS   remote sensing   sensible heat flux   Haihe Basin    
Received 2010-09-09 Revised 2010-11-02 Online: 2011-03-30 
DOI: 10.3882/j.issn.1674-2370.2011.01.003

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).

Corresponding Authors: Jing-wei WU
Email: jingweifr@gmail.com
About author:


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