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| Application of the Coupled Budyko Equation and Single Crop Coefficient Approach on Regional Evapotranspiration Estimation |
| Wang Shuaibing1,2, Li Changbin1,2, Yang Linshan1,2, Yang Wenjin1,2 |
1. College of Earth and Environment Science, Lanzhou University, Lanzhou 730000, China;
2. Key Laboratory of Western China's Environmental Systems (Ministry of Education), Lanzhou University, Lanzhou 730000, China |
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Abstract Evapotranspiration (ET) is an important section of the hydrological cycle, participating in and influencing the land surface water budget. In this study, the single crop coefficient (Kc) was derived from ET estimation based on Budyko water-heat coupled equation. Kc was then regressed with the leaf area index (LAI) extracted from the remote sensed MODIS NDVI for the establishment of the LAI-based ET module. From the coupled approach, the spatial resolution of the ET estimation could be enhanced to a level corresponding to that of the remote sensing images. Application of the coupled approach in the Taohe River Basin verified a reasonable example in regional ET estimation across a complicated and geo-ecological differentiations formed area. The coupling of the two approaches in this study provided a new idea for quantification of the regional ET.
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Received: 28 December 2013
Published: 20 May 2015
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2015, Vol. 35 
