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Estimation of Turc reference evapotranspiration with limited data against the Penman-Monteith Formula in Senegal

Journal of Agriculture and Environment for International Development

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Title Estimation of Turc reference evapotranspiration with limited data against the Penman-Monteith Formula in Senegal
 
Creator Diouf, Ousmane Coly
Weihermüller, Lutz
Ba, Kader
Cisse Faye, Seynabou
Faye, Serigne
Vereecken, Harry
 
Description Estimation of daily evapotranspiration (ET0) is required for efficient irrigation management in Senegal but physically based equations such as the Penman–Monteith (PM) approach need large inputs number which are not always available. Therefore empirical approaches such as Turcs formula are often used. Unfortunately, Turc’s formula showed high annual ET0 compared to FAO Penman–Monteith (FAO-PM) ET0 for stations in this region. Moreover, Turc underestimates mean daily ET0 for the dry season and overestimates ET0 for the wet season. For reevaluation, Turc’s empirical parameters (a and b) were fitted to match FAO-PM ET0, whereby the fitting did not improve the prediction substantially and only assuming C being independent on relative humidity yielded better agreement. In a second step universal a and b parameters were estimated for different stations in Senegal. The results indicate that one set of parameters (a and b) can be used to predict all station ET0 with fairly high accuracy indicate by a R2 of 0.80 and an RMSE of 0.71 mm day-1. Based on these findings we propose to use Turc’s approach in Senegal only with the parameters a = 0.16 and b = 29.19 with the constrain that C is independent on relative humidity.
 
Publisher Italian Agency for Development Cooperation
 
Contributor Forschungszentrum Jülich GmbH, Agrosphere Institute IBG-3, 52425 Jülich, Germany
 
Date 2016-06-27
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
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Format application/pdf
 
Identifier http://www.iao.florence.it/ojs/index.php/JAEID/article/view/417
10.12895/jaeid.20161.417
 
Source Journal of Agriculture and Environment for International Development; Vol 110, No 1 (2016); 117-137
Journal of Agriculture and Environment for International Development (JAEID); Vol 110, No 1 (2016); 117-137
2240-2802
1590-7198
 
Language eng
 
Relation http://www.iao.florence.it/ojs/index.php/JAEID/article/view/417/184
 
Rights Copyright (c) 2016 Journal of Agriculture and Environment for International Development (JAEID)