Volume 2 Issue 4
Dec.  2009
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Article Navigation >  Water Science and Engineering  > 2009  >  2(4): 16-27
Yan-xia KANG, Gui-hua LU, Zhi-yong WU, Hai HE. 2009: Comparison and analysis of bare soil evaporation models combined with ASTER data in Heihe River Basin. Water Science and Engineering, 2(4): 16-27. doi: 10.3882/j.issn.1674-2370.2009.04.002
Citation: Yan-xia KANG, Gui-hua LU, Zhi-yong WU, Hai HE. 2009: Comparison and analysis of bare soil evaporation models combined with ASTER data in Heihe River Basin. Water Science and Engineering, 2(4): 16-27. doi: 10.3882/j.issn.1674-2370.2009.04.002
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Comparison and analysis of bare soil evaporation models combined with ASTER data in Heihe River Basin

doi: 10.3882/j.issn.1674-2370.2009.04.002

  • Research Institute of Water Problems, Hohai University, Nanjing 210098, P. R. China

Funds:  This work was supported by the Ministry of Water Resources (Grants No. 200701039 and 200801001) and the National Technology Supporting Program (Grants No. 2006BAC05B02 and 2007BAC03A060301).
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  • Corresponding author: Yan-xia KANG
  • Received Date: 2010-01-11
  • Rev Recd Date: 2010-01-12
    Abstract
  • Based on ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer) remote sensing data, bare soil evaporation was estimated with the Penman-Monteith model, the Priestley-Taylor model, and the aerodynamics model. Evaporation estimated by each of the three models was compared with actual evaporation, and error sources of the three models were analyzed. The mean absolute relative error was 9% for the Penman-Monteith model, 14% for the Priestley-Taylor model, and 32% for the aerodynamics model; the Penman-Monteith model was the best of these three models for estimating bare soil evaporation. The error source of the Penman-Monteith model is the neglect of the advection estimation. The error source of the Priestley-Taylor model is the simplification of the component of aerodynamics as 0.72 times the net radiation. The error source of the aerodynamics model is the difference of vapor pressure and neglect of the radiometric component. The spatial distribution of bare soil evaporation is evident, and its main factors are soil water content and elevation

     

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