Hydrological responses to climate and land use changes: The paradox of regional and local climate effect in the Pra River Basin of Ghana

Hydrological responses to climate and land use changes: The paradox of regional and local climate effect in the Pra River Basin of Ghana

Study Region: Pra River Basin, Ghana. Study Focus: The study modelled the changes in water yield using regional, sub-regional and local climate conditions from modelling outputs at spatial resolutions of 44 km, 12 km and 0.002 km respectively to drive the Integrated Valuation of Ecosystem Services a...

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Main Authors: Enoch Bessah, Abdulganiy O. Raji, Olalekan J. Taiwo, Sampson K. Agodzo, Olusola O. Ololade, Alexandre Strapasson
Format: Article
Language:English
Published: Elsevier 2020-02-01
Series:Journal of Hydrology: Regional Studies
Online Access:http://www.sciencedirect.com/science/article/pii/S2214581819302307
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spelling doaj-da80096da98f4729b90e77f222d752802020-11-25T03:03:59ZengElsevierJournal of Hydrology: Regional Studies2214-58182020-02-0127Hydrological responses to climate and land use changes: The paradox of regional and local climate effect in the Pra River Basin of GhanaEnoch Bessah0Abdulganiy O. Raji1Olalekan J. Taiwo2Sampson K. Agodzo3Olusola O. Ololade4Alexandre Strapasson5Pan African University, Institute of Life and Earth Sciences (Including Health and Agriculture), University of Ibadan, Oyo State, Nigeria; Corresponding author.Department of Agricultural and Environmental Engineering, University of Ibadan, Oyo State, NigeriaDepartment of Geography, University of Ibadan, Oyo State, NigeriaDepartment of Agricultural and Biosystems Engineering, Kwame Nkrumah University of Science and Technology, PMB, Kumasi, GhanaCentre for Environmental Management, University of the Free State, Bloemfontein 9300, South AfricaCentre for Environmental Policy, Imperial College London, London, United KingdomStudy Region: Pra River Basin, Ghana. Study Focus: The study modelled the changes in water yield using regional, sub-regional and local climate conditions from modelling outputs at spatial resolutions of 44 km, 12 km and 0.002 km respectively to drive the Integrated Valuation of Ecosystem Services and Trade-offs model at three time periods of land use land cover (LULC). Changes in historical water yield (simulated for 1986, 2002 & 2018 LULC using the mean climatic parameters from 1981-2010) and future scenario (simulated for 2018 LULC using the mean climatic parameters from 2020-2049) for annual, seasonal and monthly periods were assessed. New Hydrological Insights for the Region: The results show that future annual water yield could change by -46%, -48%, +44% and -35% under the regional, sub-regional, local and ensemble mean of the climate scenarios respectively. Seasonal water yield from the ensemble mean of the future climate scenario was projected to decrease between 2-16 mm, with a mean decrease of 33.39% during the December–February season. There was no directional effect of spatial resolution on water yield. The future period could be impacted by both drought and flood. We recommend that re/afforestation should be encouraged to improve infiltration and reduce deforestation which was 2.27% per annum in the assessed period to prevent flood causing runoffs, while irrigation technology will help to improve resilience to drought. Keywords: Climate change, InVEST model, Land use land cover change, Pra River Basin, Regional climate models, SDSM-DC, water yieldhttp://www.sciencedirect.com/science/article/pii/S2214581819302307
collection DOAJ
language English
format Article
sources DOAJ
author Enoch Bessah
Abdulganiy O. Raji
Olalekan J. Taiwo
Sampson K. Agodzo
Olusola O. Ololade
Alexandre Strapasson
spellingShingle Enoch Bessah
Abdulganiy O. Raji
Olalekan J. Taiwo
Sampson K. Agodzo
Olusola O. Ololade
Alexandre Strapasson
Hydrological responses to climate and land use changes: The paradox of regional and local climate effect in the Pra River Basin of Ghana
Journal of Hydrology: Regional Studies
author_facet Enoch Bessah
Abdulganiy O. Raji
Olalekan J. Taiwo
Sampson K. Agodzo
Olusola O. Ololade
Alexandre Strapasson
author_sort Enoch Bessah
title Hydrological responses to climate and land use changes: The paradox of regional and local climate effect in the Pra River Basin of Ghana
title_short Hydrological responses to climate and land use changes: The paradox of regional and local climate effect in the Pra River Basin of Ghana
title_full Hydrological responses to climate and land use changes: The paradox of regional and local climate effect in the Pra River Basin of Ghana
title_fullStr Hydrological responses to climate and land use changes: The paradox of regional and local climate effect in the Pra River Basin of Ghana
title_full_unstemmed Hydrological responses to climate and land use changes: The paradox of regional and local climate effect in the Pra River Basin of Ghana
title_sort hydrological responses to climate and land use changes: the paradox of regional and local climate effect in the pra river basin of ghana
publisher Elsevier
series Journal of Hydrology: Regional Studies
issn 2214-5818
publishDate 2020-02-01
description Study Region: Pra River Basin, Ghana. Study Focus: The study modelled the changes in water yield using regional, sub-regional and local climate conditions from modelling outputs at spatial resolutions of 44 km, 12 km and 0.002 km respectively to drive the Integrated Valuation of Ecosystem Services and Trade-offs model at three time periods of land use land cover (LULC). Changes in historical water yield (simulated for 1986, 2002 & 2018 LULC using the mean climatic parameters from 1981-2010) and future scenario (simulated for 2018 LULC using the mean climatic parameters from 2020-2049) for annual, seasonal and monthly periods were assessed. New Hydrological Insights for the Region: The results show that future annual water yield could change by -46%, -48%, +44% and -35% under the regional, sub-regional, local and ensemble mean of the climate scenarios respectively. Seasonal water yield from the ensemble mean of the future climate scenario was projected to decrease between 2-16 mm, with a mean decrease of 33.39% during the December–February season. There was no directional effect of spatial resolution on water yield. The future period could be impacted by both drought and flood. We recommend that re/afforestation should be encouraged to improve infiltration and reduce deforestation which was 2.27% per annum in the assessed period to prevent flood causing runoffs, while irrigation technology will help to improve resilience to drought. Keywords: Climate change, InVEST model, Land use land cover change, Pra River Basin, Regional climate models, SDSM-DC, water yield
url http://www.sciencedirect.com/science/article/pii/S2214581819302307
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