Scenario-based impacts of land use and climate changes on the hydrology of a lowland rainforest catchment in Ghana, West Africa

Aduah, Michael Soakodan; Jewitt, Graham; Toucher, Michele

doi:10.5194/hess-2017-591

Cited by 19 publications

(6 citation statements)

References 29 publications

(13 reference statements)

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“…[21]; Michael, et al [31] to quantitatively combine results of the MK test for individual locations and to evaluate the regional trends. In the regional MK test, the of regional data is expressed mathematically in Equation 9…”

Section: Wsi (Cm/capita/year) Stress Level > 1700mentioning

confidence: 99%

Estimation of Water Stress in Guinea and Sudano-Sahelian Ecological Zones of Nigeria Under Climate Change and Population Growth

Salihu

Abdulkadir

Nsofor

et al. 2020

ijhr

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Climate change and population growth are seen to be the major factors that will shape the pattern of per capita water up to the end of 21st century. The study aimed to project water stress condition in Guinea and Sudano-Sahelian ecological zones of Nigeria under the impacts of climate change and population growth. Firstly, annual water yield was generated using KNMI climate explorer for (2019-2048), (2049-2078) and (2079-2100) under three CO2 emission trajectories. Secondly, population was projected using the Nigeria’s average growth rate of 2.6%. Thirdly, the per capita water was analysed based on water stress index. Mann-Kendal statistical test was used to analyses trends in water stress at 0.05 significant levels. Result demonstrated that the Guinea and Sudano-Sahelian ecological zones of Nigeria will experience significant positive trend in water stress with respect to climate change impact for mid and long-term periods whereas no significant trend under the short-term projection. However, regional trend analysis under the influence of population growth at constant climate observed that there were significant positive trends in water stress for the three projected periods. More so, the same positive trends were obtained under the combined impacts of climate change and population growth in Guinea and Sudano-Sahelian ecological zones of Nigeria. This implies that future water scarcity is imminent and will primarily cause by population growth and secondarily by climate change in the area. The results can act as guidelines for strategic planning for adaptive and mitigation measures to water stress as envisaged by the projection.

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Section: Wsi (Cm/capita/year) Stress Level > 1700mentioning

confidence: 99%

Estimation of Water Stress in Guinea and Sudano-Sahelian Ecological Zones of Nigeria Under Climate Change and Population Growth

Salihu

Abdulkadir

Nsofor

et al. 2020

ijhr

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“…Several studies indicated that climate change is one of the most important global environmental challenges to humanity affecting social and ecological systems (Ngongondo et al 2013;Clifton et al 2018). The hydrological cycle will be directly altered by the impacts of climate change, subsequently affect local water resource availability in most regions in the world (Faramarzi et al 2013;Mechal et al 2015;Li et al 2016;Aduah et al 2017;Awal et al 2018;Jin et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Modeling the impact of climate change on hydrological responses in the Lake Tana basin, Ethiopia

Teklay

Dile

Asfaw

et al. 2022

Dynamics of Atmospheres and Oceans

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BackgroundHydrologic systems have been changing due to the impact of climate change and climate variability. The impacts of climate change are set to increase in the future due to the rise of global warming. Quantifying the impact of climate change on the spatial and temporal hydrological processes is important for integrated water resource management. The Lake Tana basin, which is the source of the Upper Blue Nile, is vulnerable to climate change and variability. This study was carried out in the four major tributary watersheds of the Lake Tana basin: Gilgel Abay, Gumara, Ribb, and Megech. The climate model and hydrological model was used to (i) to evaluate the performance of the Soil and Water Assessment Tool for study watershed, (ii) to assess the future rainfall and temperature variability and change in the study watershed, and (iii) to examine the impact of climate change on future watershed hydrology. The study used dynamically downscaled climate data for the baseline (2010)(2011)(2012)(2013)(2014)(2015) and future period (2046-2051) under two Representative Concentration Pathways (RCP4.5 and RCP8.5). The climate scenarios were simulated using the Weather Research and Forecasting (WRF) model, with a 4-km horizontal resolution. A linear scaling method was applied to minimize model biases. The SWAT model was used to estimate the baseline and future hydrology using the bias-corrected climate data. ResultsThe performance of the SWAT model was 'good' to 'very good' for both the calibration and validation periods, with the Nash-Sutcliffe e ciency values between 0.71 to 0.92. The projected changes in rainfall vary with seasons and watershed under both scenarios. On average, annual rainfall may increase by 9.8% and 21.2% under RCP4.5 and RCP8.5 scenarios, respectively. Minimum temperature may rise by 1.68 °C and 2.26 °C while maximum temperature may increase by 1.65 °C and 2.75 °C under RCP4.5 and RCP8.5 scenarios, respectively. The changes in climate may cause an increase in surface runoff by 20.9% and 46.5% under RCP4.5 and RCP8.5 scenarios, respectively, while the evapotranspiration increase by 4.7% and 12.2% under RCP4.5 and RCP8.5, respectively. ConclusionThe ndings provide valuable insights to implement appropriate water management strategies to mitigate and adapt to the negative impacts of climate change and variability on the Lake Tana basin, and other regions which have similar agro-ecology.However, the magnitude and direction of the impact vary from region to region; for the impact severe to Ethiopia as its economy is rain-fed agriculture, which is highly vulnerable to climate change and variability (Conway and Schipper 2011). Understanding the impacts of climate change is vital especially in regions where the social and ecological systems are highly dependent on climate and water resources such as in Africa.The potential impacts of climate change and variability on water resources have been studied in different regions in Africa. For example, Faramarzi et al. (2013) analyzed the impact of climate change ...

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“…In West Africa, since the 1990s, there have been extensive land use changes (LUC) and intensification of climate change [1]. Additionally, the rapid population growth has led to the expansion of croplands due to the need to grow more food to meet the rising food demand of the burgeoning population [2].…”

Section: Introductionmentioning

confidence: 99%

Assessing the Effects of Anthropogenic Land Use on Soil Infiltration Rate in a Tropical West African Watershed (Ouriyori, Benin)

Togbévi

Ploeg

Tohoun

et al. 2022

Applied and Environmental Soil Science

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Soil infiltration at a watershed scale is important for understanding and predicting the hydrological process in soil-water-plant systems. This study investigated the effects of land use (LU) conversion on the infiltration rate in the Ouriyori watershed. To that end, in situ infiltration was carried out over the watershed under thirty-six pairs of adjacent cropland-fallow plots using the hood infiltrometer. Saturated hydraulic conductivity (Ks), soil properties, and soil classes were further compared. Results showed a high variability of Ks following the LU classes with a coefficient of variation greater than 60%. After data log transformation, the mean values of Ks showed high infiltration and ranged between 2.59 and 2.42 cm d−1, respectively, for fallow land and cropland. Thus, Ks was relatively lower in cropland compared to fallow land. Hence, the low infiltration recorded in croplands indicated the degradative impacts of unceasing tillage operations for crop production without crop residue incorporation into the soil during tillage. There was no significant difference in bulk density and soil texture in both types of land use. Considering soil classes, the highest infiltration rate was found in Ferric Luvisol and the lowest rate in Dystric Gleysol, meaning that the high infiltration observed in Ferric Luvisol was due to the abundance of soil macropores. Change in natural vegetation to croplands induced a low infiltration rate and macropore connectivity. Moreover, fallow lands tend to provide water storage capacity through the improvement of mesopores, while soil compaction through agricultural activities reduces soil porosity and therefore soil infiltration. In addition, the paired Student’s t-test performed on the transformed data was statistically significant, indicating a difference between Ks under cropland and Ks under fallow land. To improve soil and water conservation for crop production as well as for sustainable rural populations’ livelihoods in the watershed, occasional fallowing may be observed to dampen infiltration hindering soil surface conditions.

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Scenario-based impacts of land use and climate changes on the hydrology of a lowland rainforest catchment in Ghana, West Africa

Cited by 19 publications

References 29 publications

Estimation of Water Stress in Guinea and Sudano-Sahelian Ecological Zones of Nigeria Under Climate Change and Population Growth

Estimation of Water Stress in Guinea and Sudano-Sahelian Ecological Zones of Nigeria Under Climate Change and Population Growth

Modeling the impact of climate change on hydrological responses in the Lake Tana basin, Ethiopia

Assessing the Effects of Anthropogenic Land Use on Soil Infiltration Rate in a Tropical West African Watershed (Ouriyori, Benin)

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