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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/12175

Title: Estimating Actual Evapotranspiration using the SEBAL Model for the Atankwidi and Afram Catchments in Ghana
Authors: Salifu, Tayari
Agyare, W. A.
Kyei-Baffour, Nicholas
Mensah, Ebenezer
Ofori, Emmanuel
Keywords: Evapotranspiration
Landsat
Land use
Remote sensing
SEBAL
Model
Issue Date: Jan-2012
Publisher: International Journal of Applied Agricultural Research
Citation: International Journal of Applied Agricultural Research, Volume 6 Number 2 (2011) pp. 177-193
Abstract: Evapotranspiration (ET) monitoring has important implications on global and regional climate modelling. It is important for the hydrological cycle and assessment of environmental stress that affects ecosystems. Accurate measurement and estimation of ET is a basic input in computing water balance and to estimate water availability and requirements. Most methods for ET computation can only provide point estimates of ET for a specific location and fails to provide ET on a regional scale and makes it inadequate for proper water resource management. In this study, the Surface Energy Balance Algorithm for Land (SEBAL) model is used to estimate actual evapotranspiration (ETa) for different land use/cover types (closed woodlands, gallery forests, open woodlands, farmlands, water bodies, barelands, rocky areas and built-up areas) for the Atankwidi and Afram catchments in the Volta Basin of Ghana. It was found that the SEBAL model can successfully estimate and distinguish ETa among different land use/cover types in the two catchments. SEBAL estimates of ETa varied from 1.4 to 7.30 mm/day across the different land use/cover types. The range of CVs for ETa was 5−75% across the different land use/cover types for the two catchments. The results confirms SEBAL is an appropriate algorithm for estimating ETa using satellite images in catchments similar to that of the study areas, where few or no ground measurements are available.
Description: This article is published in International Journal of Applied Agricultural Research
URI: http://hdl.handle.net/123456789/12175
ISSN: 0973-2683
Appears in Collections:College of Agric and Natural Resources

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