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Title: A Modified SEBAL Modeling Approach for Estimating Crop Evapotranspiration in Semi-arid Conditions
Authors: Papadavid, George 
Hadjimitsis, Diofantos G. 
Toulios, Leonidas 
Keywords: SEBAL model;Evapotranspiration;Crop canopy factors;Remote sensing
Category: Environmental Engineering
Field: Engineering and Technology
Issue Date: May-2013
Publisher: Springer International Publishing
Source: Water Resources Management, Volume 27, Issue 9, pages 3493–3506
Abstract: Remote sensing methods are becoming attractive to estimate crop evapotranspiration, as they cover large areas and can provide accurate and reliable estimations; intensive field monitoring is also not required, although some ground-truth measurements can be helpful in interpreting satellite images. For the purposes of this paper, modeling and remote sensing techniques were integrated for estimating actual evapotranspiration of groundnuts (Arachishypogaea, L.) that is cultivated near Mandria Village in Paphos District of Cyprus. The Surface Energy Balance Algorithm for Land (SEBAL) was adopted for the first time in Cyprus, employing the essential adaptations for local soil and meteorological conditions. Landsat-5 TM and 7 ETM+ images were used to retrieve the needed spectral data. The SEBAL model is enhanced with empirical equations determined as part of the present study, regarding crop canopy factors, in order to increase its accuracy. Maps of ETa were created using the SEBAL modified model (CYSEBAL) for the area of interest. The results have been compared to the measurements from an evaporation pan (which was used as a reference) and those of the original SEBAL model. The statistical comparison has shown that the modified SEBAL yields results that are comparable to those of the evaporation pan. T-test application has revealed that the statistical difference between SEBAL and CYSEBAL is significant and quite crucial, especially in a place with limited surface and underground water resources.
ISSN: 0920-4741
1573-1650 (Online)
DOI: 10.1007/s11269-013-0360-x
Rights: © Springer Science
Type: Article
Appears in Collections:Άρθρα/Articles

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