Water Science and Engineering 2011, 4(3) 237-245 DOI:   10.3882/j.issn.1674-2370.2011.03.001  ISSN: 1674-2370 CN: 32-1785/TV

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quantitative remote sensing
SEBS model
Che-sheng ZHAN
Hui-xiao WANG
Jian YIN
Article by Che-sheng ZHAN
Article by Jie ZHAO
Article by Hui-xiao WANG
Article by Jian YIN

Quantitative estimation of land surface evapotranspiration in Taiwan based on MODIS data

Che-sheng ZHAN*1, Jie ZHAO2, Hui-xiao WANG3, Jian YIN3

1. Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, P. R. China
2. Beijing Tsinghua Urban Planning and Design Institute, Beijing 100085, P. R. China
3. Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Water Sciences, Beijing Normal University, Beijing 100875, P. R. China


Land surface evapotranspiration (ET) determines the local and regional water-heat balances. Accurate estimation of regional surface ET provides a scientific basis for the formulation and implementation of water conservation programs. This study set up a table of the momentum roughness length and zero-plane displacement related with land cover and an empirical relationship between land surface temperature and air temperature. A revised quantitative remote sensing ET model, the SEBS-Taiwan model, was developed. Based on Moderate Resolution Imaging Spectroradiometer (MODIS) data, SEBS-Taiwan was used to simulate and evaluate the typical actual daily ET values in different seasons of 2002 and 2003 in Taiwan. SEBS-Taiwan generally performed well and could accurately simulate the actual daily ET. The simulated daily ET values matched the observed values satisfactorily. The results indicate that the net regional solar radiation, evaporation ratio, and surface ET values for the whole area of Taiwan are larger in summer than in spring, and larger in autumn than in winter. The results also show that the regional average daily ET values of 2002 are a little higher than those of 2003. Through analysis of the ET values from different types of land cover, we found that forest has the largest ET value, while water areas, bare land, and urban areas have the lowest ET values. Generally, the Northern Taiwan area, including Ilan County, Nantou County, and Hualien County, has higher ET values, while other cities, such as Chiayi, Taichung, and Tainan, have lower ET values.

Keywords evapotranspiration   quantitative remote sensing   MODIS   SEBS model   Taiwan  
Received 2011-01-07 Revised 2011-06-20 Online: 2011-09-30 
DOI: 10.3882/j.issn.1674-2370.2011.03.001

This work was supported by the National Natural Science Foundation of China (Grant No. 40901023).

Corresponding Authors: Che-sheng ZHAN
Email: zhancs2006@gmail.com
About author:


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