Satellite-based estimation of actual evapotranspiration in the Buyuk Menderes Basin, Turkey

Author:

Aksu Hakan1,Arikan Alparslan2

Affiliation:

1. State Hydraulic Works of Turkey, No. 16 06100, Çankaya, Ankara, Turkey

2. Hacettepe University Hydrogeology Engineering Department, Beytepe, Ankara 06800, Turkey

Abstract

Evapotranspiration (ET) is one of the most important components of the hydrological cycle, but it is often the most difficult variable to determine at basin scale. Traditionally, ET is estimated using point-based measurements collected at meteorological stations, but the non-spatial nature of these measurements often leads to significant errors when utilized at watershed scale. In this study, the METRIC (mapping evapotranspiration at high resolution with internalized calibration) approach was evaluated using remotely sensed observations from the moderate resolution imaging spectroradiometer sensor and data from meteorological stations in the lower catchment of the Buyuk Menderes Basin in western Turkey in the form of actual ET maps at daily and monthly intervals between 1st April and 30th September 2010. The energy fluxes and daily ET maps resulting from METRIC were compared with ET data estimated with the help of meteorological parameters. These results were found to be compatible with the ground-based estimations which suggest considerable potential for the METRIC model for estimating spatially distributed actual ET values with little ground-based weather data.

Publisher

IWA Publishing

Subject

Water Science and Technology

Reference39 articles.

1. Assessing integrity of weather data for reference evapotranspiration estimation;Allen;J. Irrig. Drain. Eng.,1996

2. Ecostress METRIC evapotranspiration algorithm;Allen,2014

3. Allen R. G. Pereira L. S. Raes D. Smith M. 1998 Crop Evapotranspiration – Guidelines for Computing Crop Water Requirements. FAO Irrigation and Drainage Paper 56, FAO, Rome, Italy.

4. Satellite-based energy balance for mapping evapotranspiration with internalized calibration, METRIC (model);Allen;J. Irrig. Drain. Eng.,2007

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