IAHS2022-152
https://doi.org/10.5194/iahs2022-152
IAHS-AISH Scientific Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Evaluation and calibration of Twenty alternative methods for estimating reference evapotranspiration in main hydrosystems of Senegal: Senegal, Gambia and Casamance River Basins

Ansoumana Bodian1, Papa Malick Ndiaye1, Serigne Bassirou Diop1, Lamine Diop2, Alain Dezetter3, Andrew Ogilvie4, and Koffi Djaman5
Ansoumana Bodian et al.
  • 1Laboratoire Leïdi “Dynamique des Territoires et Développement”, Université Gaston Berger (UGB), Sénégal
  • 2UFR S2ATA Sciences Agronomiques, de l’Aquaculture et des Technologies Alimentaires ; Université Gaston Berger, Saint-Louis BP 234, Sénégal
  • 3HydroSciences Montpellier, University of Montpellier, IRD, CNRS, CC 057, 163 rue Auguste Broussonnet ; 34090 Montpellier, France
  • 4UMR G-EAU, AgroParisTech, Cirad, University of Montpellier, IRD, INRAE, Montpellier SupAgro, 34196 Montpellier, France
  • 5Department of Plant and Environmental Sciences, New Mexico State University, Agricultural Science Center at Farmington, P.O. Box 1018, Farmington, NM 87499, USA

Reference evapotranspiration (ET0) is an essential parameter for hydrological modeling, irrigation planning and for studying the impacts of climate change on water resources. The Penman-Monteith method is recommended for estimating ET0 under all climatic conditions. But its application is limited in regions where data are difficult to access. The alternative is to use methods that incorporate fewer climatic parameters. The objective of this work is to evaluate twenty alternative methods of estimating ET0 and to calibrate and validate the best ones in order to adapt them to the climatic context of the basins of Senegal, Gambia and Casamance. This tree basins are the main hydrosystems of Senegal. The KGE and the PBIAS were used to evaluate the performance of the methods. The results show that the methods of Valiantzas 1, Doorenboss & Pruitt and Penman are the most robust for the estimation of ET0 in the three basins. The calibration/validation allowed the improvement of the methods of Trabert, Valiantzas 2 and Hargreaves & Samani for the estimation of the reference evapotranspiration in the basins of Senegal, Gambia and Casamance.

Keywords: Reference evapotranspiration, Penman-Monteith, Alternative Methods, Calibration/validation, Senegal, Gambia and Casamance Basins.

How to cite: Bodian, A., Ndiaye, P. M., Diop, S. B., Diop, L., Dezetter, A., Ogilvie, A., and Djaman, K.: Evaluation and calibration of Twenty alternative methods for estimating reference evapotranspiration in main hydrosystems of Senegal: Senegal, Gambia and Casamance River Basins, IAHS-AISH Scientific Assembly 2022, Montpellier, France, 29 May–3 Jun 2022, IAHS2022-152, https://doi.org/10.5194/iahs2022-152, 2022.