Estimation of Daily Evapotranspiration by Three-Temperature Model At Large Catchment Scale

Estimation of Daily Evapotranspiration by Three-Temperature Model At Large Catchment Scale

Estimation of Daily Evapotranspiration by Three-Temperature Model At Large Catchment Scale
Y. J. Xiong , G. Y. Qiu, J. Yin, S. H. Zhao, X. Q. Wu , P. Wang , S. Zeng 

ESTIMATION OF DAILY EVAPOTRANSPIRATION BY
Abstract:
 Three-temperatures model (3T model) was a recently proposed algorithm, which could be used to estimate actual evapotranspiration (ET) and evaluate environmental quality. The key parameters included are air temperature, land surface temperature and reference land temperature. Compared with other conventional ET estimation algorithms, site-specific parameters, such as surface resistance and aerodynamic resistance are not required. Although previous ground based experiments showed that the 3T model had reasonable precision for ET estimation, its application for satellite based remote sensing was not yet carried out. This study aims to evaluate its applicability at large catchment scale based on satellite remote sensing. First, the derivative processes to extend the 3T model for remote sensing were developed and by using TM image, a case study was presented. Thereafter, Penman-Monteith equation was chosen to validate the accuracy of the 3T model. Results showed that the absolute error of daily ET estimated by the two algorithms varied from 0.09 to 0.53 mm d-1, with an average of 0.05 mm d-1. Further analysis indicated that the 3T model had a reasonable accuracy. Meanwhile, the simplicity of the 3T model shows a good potential for remotely sensed actual evapotranspiration at large catchment scale.

KEY WORDS: Remote Sensing; Modeling; Algorithms; Landsat Image; Thermal; Environmental Monitoring

Download of full Paper in PDF

 

Categories: Research Papers

About Author

GIS Resources

GIS Resources is an initiative of Spatial Media and Services Enterprises with the purpose that everyone can enrich their knowledge and develop competitiveness. GIS Resources is a global platform, for latest and high-quality information source for the geospatial industry, brings you the latest insights into the developments in geospatial science and technology.

Write a Comment

Your e-mail address will not be published.
Required fields are marked*

This site uses Akismet to reduce spam. Learn how your comment data is processed.