Rainfall and temperature projections and the implications on streamflow and evapotranspiration in the near future at the Tano River Basin of Ghana

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dc.contributor.authorLarbi, Isaac
dc.contributor.authorNyamekye, Clement
dc.contributor.authorDotse, Sam-Quarcoo
dc.contributor.authorDanso, Derrick K.
dc.contributor.authorAnnor, Thompson
dc.contributor.authorBessah, Enoch
dc.contributor.authorLimantol, Andrew Manoba
dc.contributor.authorAttah-Darkwa, Thomas
dc.contributor.authorKwawuvi, Daniel
dc.contributor.authorYomo, Mawulolo
dc.contributor.orcid0000-0002-3679-854X
dc.date.accessioned2024-07-29T11:36:01Z
dc.date.available2024-07-29T11:36:01Z
dc.date.issued2021
dc.descriptionThis article is published by Elseveire, 2021 and is also available at https://doi.org/10.1016/j.sciaf.2021.e01071
dc.description.abstractClimate change is projected to negatively affect water security which is already a chal lenge in many areas of Ghana including the Tano river basin (TRB). This study assessed the projections of rainfall and temperature and its impact on streamflow and actual evap otranspiration (ET) in the TRB of Ghana for 2021-2050 relative to the period 1986-2015. The impact assessment focused on how climate change under Representative Concentra tion Pathways (RCP 4.5 and RCP8.5) based on an ensemble mean of two regional climate models (RCMs) would affect streamflow and ET using the Soil and Water Assessment Tool (SWAT) model. Trend analysis and quantification for the streamflow and ET were analyzed using the Mann-Kendall’s and Sen’s slope estimators. The results show that the mean annual rainfall of 1401.9 mm would increase slightly by 0.5 % with a decreasing trend (1.22mm/yr) under the RCP4.5 scenario, but would decrease by 3.2% with a decreasing trend (0.3m mm/yr) under the RCP8.5 scenario. The mean annual temperature showed an increase (2.1 °C and 2.6 °C) with a statistically significant increasing trend of 0.07 and 0.09 °C/yr under RCP 4.5 and RCP8.5 respectively. An increase in ET with a non-significant increasing trend at a rate of 0.74 and 1.07 mm/year under RCP4.5 and RCP8.5 scenarios respectively is also projected. The mean annual streamflow is projected to decrease, with the decrease been more pronounced under the RCP8.5 (37.5%) scenario compared to the RCP4.5 scenario (19.9%). In general, the outcome of this study presents a useful perspective
dc.description.sponsorshipKNUST
dc.identifier.citationScientific African 15 (2022) e01071
dc.identifier.uri10.1016/j.sciaf.2021.e01071
dc.identifier.urihttps://ir.knust.edu.gh/handle/123456789/15883
dc.language.isoen
dc.publisherElsevier
dc.titleRainfall and temperature projections and the implications on streamflow and evapotranspiration in the near future at the Tano River Basin of Ghana
dc.typeArticle
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