Ndiaye P.M., Bodian A., Diop S.B., Diop L., Dezetter Alain, Ogilvie Andrew, Djaman K. (2024). Trend analysis of reference evapotranspiration and climate variables in the main hydrosystems of Senegal : Senegal, Gambia and Casamance river basins. In :
Cudennec C. (ed.), Grimaldi S. (ed.). IAHS2022 - Hydrological sciences in the Anthropocene. Proceedings of IAHS, 385, 305-311. Scientific Assembly of the International Association of Hydrological Sciences, 11., Montpellier (FRA), 2022/05/29-2022/06/03. ISSN 2199-899X.
Titre du document
Trend analysis of reference evapotranspiration and climate variables in the main hydrosystems of Senegal : Senegal, Gambia and Casamance river basins
Année de publication
2024
Auteurs
Ndiaye P.M., Bodian A., Diop S.B., Diop L., Dezetter Alain, Ogilvie Andrew, Djaman K.
In
Cudennec C. (ed.), Grimaldi S. (ed.), IAHS2022 - Hydrological sciences in the Anthropocene
Source
Proceedings of IAHS, 2024,
385, 305-311 ISSN 2199-899X
Colloque
Scientific Assembly of the International Association of Hydrological Sciences, 11., Montpellier (FRA), 2022/05/29-2022/06/03
Analysis of reference evapotranspiration (ET0) trends is essential for understanding the impacts of climate change on water resources. Thus, despite the continuous rise in temperatures, a decrease in evapotranspiration is noted in some parts of the world. This contrast is called the 'evaporation paradox' and is thought to be related to the variation in wind speed, relative humidity and solar radiation. The objective of this work is to analyze the annual and seasonal trends of ET0 and climate variables at the scale of the Senegal, Gambia and Casamance river basins. The reanalyze data of NASA/POWER are used over the period 1984-2019. Mann Kendall's test and Sen slope were used to analyze trends in ET0 and climate variables. Results show that on annual scale, ET0 increases significantly in 32?% of the Senegal basin and decreases in less than 1 % of it. In contrast, in the Casamance and Gambia basins, the annual ET0 drops by 65% and 18%, respectively. On an annual scale, temperature and relative humidity show an increasing trend over all basins while wind speed and radiation decrease significantly. This confirms the existence of the evaporation paradox in the three basins. This phenomenon is explained by the increase in relative humidity and the decrease in wind speed and solar radiation.
Plan de classement
Régimes hydroclimatiques [062REGHYD]
Localisation
Fonds IRD [F B010094503]
Identifiant IRD
fdi:010094503
