Climate change impacts on the water and groundwater resources of the Lake Tana Basin, Ethiopia

Climate change impacts on the water cycle can severely affect regions that rely on groundwater to meet their water demands in the mid- to long-term. In the Lake Tana basin, Ethiopia, discharge regimes are dominated by groundwater. We assess the impacts of climate change on the groundwater contributi...

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Autores principales:	Tibebe B. Tigabu, Paul D. Wagner, Georg Hörmann, Jens Kiesel, Nicola Fohrer
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	climate change ethiopia groundwater surface runoff swat water balance Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/c348bbcfca504255902c5e4934ec91b1
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spelling	oai:doaj.org-article:c348bbcfca504255902c5e4934ec91b12021-11-05T19:01:33ZClimate change impacts on the water and groundwater resources of the Lake Tana Basin, Ethiopia2040-22442408-935410.2166/wcc.2020.126https://doaj.org/article/c348bbcfca504255902c5e4934ec91b12021-08-01T00:00:00Zhttp://jwcc.iwaponline.com/content/12/5/1544https://doaj.org/toc/2040-2244https://doaj.org/toc/2408-9354Climate change impacts on the water cycle can severely affect regions that rely on groundwater to meet their water demands in the mid- to long-term. In the Lake Tana basin, Ethiopia, discharge regimes are dominated by groundwater. We assess the impacts of climate change on the groundwater contribution to streamflow (GWQ) and other major water balance components in two tributary catchments of Lake Tana. Based on an ensemble of 35 bias-corrected regional climate models and a hydrologic catchment model, likely changes under two representative concentration pathways (RCP4.5 and 8.5) are assessed. No or only slight changes in rainfall depth are expected, but the number of rainy days is expected to decrease. Compared to the baseline average, GWQ is projected to decrease whereas surface runoff is projected to increase. Hence, rainfall trends alone are not revealing future water availability and may even be misleading, if regions rely heavily on groundwater. HIGHLIGHTS Change in the rainfall intensity affects the availability of groundwater in a catchment.; Rainfall projections from different global and regional climate models show disparities among each other.; The projected actual evapotranspiration is expected to decrease in the future for the study region due to less water availability.;Tibebe B. TigabuPaul D. WagnerGeorg HörmannJens KieselNicola FohrerIWA Publishingarticleclimate changeethiopiagroundwatersurface runoffswatwater balanceEnvironmental technology. Sanitary engineeringTD1-1066Environmental sciencesGE1-350ENJournal of Water and Climate Change, Vol 12, Iss 5, Pp 1544-1563 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	climate change ethiopia groundwater surface runoff swat water balance Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350
spellingShingle	climate change ethiopia groundwater surface runoff swat water balance Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Tibebe B. Tigabu Paul D. Wagner Georg Hörmann Jens Kiesel Nicola Fohrer Climate change impacts on the water and groundwater resources of the Lake Tana Basin, Ethiopia
description	Climate change impacts on the water cycle can severely affect regions that rely on groundwater to meet their water demands in the mid- to long-term. In the Lake Tana basin, Ethiopia, discharge regimes are dominated by groundwater. We assess the impacts of climate change on the groundwater contribution to streamflow (GWQ) and other major water balance components in two tributary catchments of Lake Tana. Based on an ensemble of 35 bias-corrected regional climate models and a hydrologic catchment model, likely changes under two representative concentration pathways (RCP4.5 and 8.5) are assessed. No or only slight changes in rainfall depth are expected, but the number of rainy days is expected to decrease. Compared to the baseline average, GWQ is projected to decrease whereas surface runoff is projected to increase. Hence, rainfall trends alone are not revealing future water availability and may even be misleading, if regions rely heavily on groundwater. HIGHLIGHTS Change in the rainfall intensity affects the availability of groundwater in a catchment.; Rainfall projections from different global and regional climate models show disparities among each other.; The projected actual evapotranspiration is expected to decrease in the future for the study region due to less water availability.;
format	article
author	Tibebe B. Tigabu Paul D. Wagner Georg Hörmann Jens Kiesel Nicola Fohrer
author_facet	Tibebe B. Tigabu Paul D. Wagner Georg Hörmann Jens Kiesel Nicola Fohrer
author_sort	Tibebe B. Tigabu
title	Climate change impacts on the water and groundwater resources of the Lake Tana Basin, Ethiopia
title_short	Climate change impacts on the water and groundwater resources of the Lake Tana Basin, Ethiopia
title_full	Climate change impacts on the water and groundwater resources of the Lake Tana Basin, Ethiopia
title_fullStr	Climate change impacts on the water and groundwater resources of the Lake Tana Basin, Ethiopia
title_full_unstemmed	Climate change impacts on the water and groundwater resources of the Lake Tana Basin, Ethiopia
title_sort	climate change impacts on the water and groundwater resources of the lake tana basin, ethiopia
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/c348bbcfca504255902c5e4934ec91b1
work_keys_str_mv	AT tibebebtigabu climatechangeimpactsonthewaterandgroundwaterresourcesofthelaketanabasinethiopia AT pauldwagner climatechangeimpactsonthewaterandgroundwaterresourcesofthelaketanabasinethiopia AT georghormann climatechangeimpactsonthewaterandgroundwaterresourcesofthelaketanabasinethiopia AT jenskiesel climatechangeimpactsonthewaterandgroundwaterresourcesofthelaketanabasinethiopia AT nicolafohrer climatechangeimpactsonthewaterandgroundwaterresourcesofthelaketanabasinethiopia
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Climate change impacts on the water and groundwater resources of the Lake Tana Basin, Ethiopia

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