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Accueil du site → Master → Pays Bas → 2014 → Impacts of climate change, land-cover change and reservoir operation on the hydrology of Rib-Gumera catchments, Upper Blue Nile, Ethiopia

UNESCO-IHE Institute for Water Education, Delft (2014)

Impacts of climate change, land-cover change and reservoir operation on the hydrology of Rib-Gumera catchments, Upper Blue Nile, Ethiopia

Adamu, T.A.

Titre : Impacts of climate change, land-cover change and reservoir operation on the hydrology of Rib-Gumera catchments, Upper Blue Nile, Ethiopia

Auteur : Adamu, T.A.

Université de soutenance : UNESCO-IHE Institute for Water Education, Delft

Grade : Master of Science (MS) 2014

Résumé
This study was undertaken to examine the effects of climate change, land-cover change and land and water management interventions on the hydrological fluxeson the two adjacent upper Lake Tana catchments (Rib and Gumera) of the Blue Nile, Ethiopia. Climate change, Land-use/cover change and other land and water management interventions in the upper catchments o fLake Tana (Rib-Gumera) might have significantly altered the amount of natural runoff, Evapotranspiration, infiltration, subsurface flow and other hydrological fluxes. Development of new large scale irrigation schemes through the collaboration of the international and national agencies in the upper catchments of Rib and Gumera River and introduction of new varieties of crops like rice are the likely causes of hydrological changes in the area. In recent years the overall hydrological system has also been altered by regional plan on rehabilitation of natural resource management program through the enhancement of effective land and water management activities. Those multiple land management options with the effect ofclimatic variability independently or in a combined way may have significant changes in the hydrology of Rib-Gumara catchments. Downstream of the catchments lay the fogera plain which is suitable for irrigation activities during dry period. The area will be the future focus of the government to build infrastructures so as to increase the crop productivity. However, current and possible future changes in the upper catchments have not been taken into consideration. In this study, the impact of future climate change, land cover changes and water management interventions for the Rib-Gumera catchments have been assessed through Soil and Water Assessment Tool (SWAT 2005). The model performance was assessed at monthly time scale using coefficient of determination (R2), NashSutcliffe Efficiency (NSE) and Percent mean annual Bias (PBIAS). The impact on hydrological fluxes due to climate change, land covers change and reservoir operations are examined with reference to current condition (baseline scenario).

Sujets  : climate change land use reservoir operations water management catchment areas Upper Blue Nile Ethiopia

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