Assessment of water supply and demand in Gilgel Gibe watershed, southwest Ethiopia

Fanta, Sewmehon Sisay; Namara, Wanna Geyisa; Yesuf, Mamuye Busier

doi:10.1007/s40899-022-00684-3

Cited by 4 publications

(1 citation statement)

References 59 publications

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“…However, there is a lack of understanding of the implications of climate change on hydrology at the catchment level. The Gilgel Gibe catchment is of particular concern due to its intensive use and vulnerability to environmental degradation [26][27][28]. The Gibe River is a vital resource for generating hydropower and providing freshwater to small towns along its course [29].…”

Section: Introductionmentioning

confidence: 99%

The impacts of climate change on hydrological processes of Gilgel Gibe catchment, southwest Ethiopia

Tilahun,

Bizuneh,

Mekonnen

2023

PLoS ONE

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Climate change is a significant driver of water resource availability, affecting the magnitude of surface runoff, aquifer recharge, and river flows. This study investigated the impact of climate change on hydrological processes within the Gilgel Gibe catchment and aimed to determine the level of exposure of water resources to these changes, which is essential for future adaptability planning. To achieve this objective, an ensemble mean of six regional climate models (RCMs) from the coordinated regional climate downscaling experiment (CORDEX)-Africa was used to simulate future climatic scenarios. The RCMs outputs were then bias corrected using distribution mapping to match observed precipitation and temperature. The Soil and Water Assessment Tool (SWAT) model was used to assess the hydrological impacts of climate change on the catchment. The results indicated that the ensemble mean of the six RCMs projects a decline in precipitation and an increase in temperature under both the RCP4.5 and RCP8.5 representative concentration pathways. Moreover, the increases in both maximum and minimum temperatures are higher for higher emission scenarios, indicating that RCP8.5 is warmer than RCP4.5. The projected climate change shows a decrease in surface runoff, groundwater, and water yield, resulting in an overall decline of annual flow. This decline is mainly due to the reduction in seasonal flows driven by climate change scenarios. The changes in precipitation range from -11.2% to -14.3% under RCP4.5 and from -9.2% to -10.0% under RCP8.5, while the changes in temperature range from 1.7°C to 2.5°C under RCP4.5 and from 1.8°C to 3.6°C under RCP8.5. These changes could lead to reduced water availability for crop production, which could be a chronic issue for subsistence agriculture. Additionally, the reduction of surface water and groundwater could further exacerbate water stress in the downstream areas, affecting the availability of water resources in the catchment. Furthermore, the increasing demands for water, driven by population growth and socioeconomic progress, along with the variability in temperature and evaporation demands, will amplify prolonged water scarcity. Therefore, robust climate-resilient water management policies are indispensable to manage these risks. In conclusion, this study highlights the importance of considering the impact of climate change on hydrological processes and the need for proactive adaptation measures to mitigate the impacts of climate change on water resources.

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Section: Introductionmentioning

confidence: 99%

The impacts of climate change on hydrological processes of Gilgel Gibe catchment, southwest Ethiopia

Tilahun,

Bizuneh,

Mekonnen

2023

PLoS ONE

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Assessment of future water demand and supply using WEAP model in Dhasan River Basin, Madhya Pradesh, India

Nivesh

Patil

Goyal

et al. 2022

Environ Sci Pollut Res

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Sustainable planning of multipurpose hydropower reservoirs with environmental impacts in a simulation–optimization framework

2022

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Hydropower projects involve enormous investments that require an efficient cost–benefit framework and optimization model for proper development. Dams and hydropower plants have many impacts on the environment. These environmental impacts are often not included in the economic calculations and planning of the projects, which leads to the loss of natural resources. The primary purpose of this research is to incorporate environmental impacts into optimization and decision-making. A comprehensive simulation–optimization model is developed to optimize hydropower decisions. The positive and negative values of environmental impacts are incorporated into an economic objective function under different scenarios, and optimal design was done for each scenario. The results show that considering environmental economics affects the multipurpose hydropower project's NPV and decision outcomes. Considering environmental impacts compared to not considering them has reduced NPV of the project by 13.9%. The results emphasize the importance of including these impacts to achieve sustainable development and management.

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Assessment of water supply and demand in Gilgel Gibe watershed, southwest Ethiopia

Cited by 4 publications

References 59 publications

The impacts of climate change on hydrological processes of Gilgel Gibe catchment, southwest Ethiopia

The impacts of climate change on hydrological processes of Gilgel Gibe catchment, southwest Ethiopia

Assessment of future water demand and supply using WEAP model in Dhasan River Basin, Madhya Pradesh, India

Sustainable planning of multipurpose hydropower reservoirs with environmental impacts in a simulation–optimization framework

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