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Understanding Catchment Processes and Hydrological Modelling in the Abay/Upper Blue Nile Basin, Ethiopia (Paperback)
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Understanding Catchment Processes and Hydrological Modelling in the Abay/Upper Blue Nile Basin, Ethiopia (Paperback)
Series: IHE Delft PhD Thesis Series
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The Abay / Upper Blue Nile basin contributes the largest share of
discharge to the river Nile. However, the basin exhibits large
spatio-temporal variability in rainfall and runoff. Moreover, human
activities also impact hydrological processes through intensive
agriculture, overgrazing and deforestation, which substantially
affect the basin hydrology. Thus, understanding hydrological
processes and hydro-climatic variables at various spatio-temporal
scales is essential for sustainable management of water resources
in the region. This research investigates the hydrology of the
basin in depth using a range of methods at various spatio-temporal
scales. The methods include long-term trend analysis of
hydroclimatic variables, hydrologic responses analysis of land
cover change, stable isotope techniques and process based
rainfallrunoff modelling. A combination of field investigations
with new measurements of precipitation, water levels and stable
isotopes as well as existing hydro-climatic data offered gaining
new insights about runoff generation processes in headwater
catchments. The use of rainfall-runoff modelling in two meso-scale
catchments of the Abay basin depict that a single model structure
in a lumped way for the entire Abay basin cannot represent all the
dominant hydrological processes. The results of the different
approaches demonstrated the potential of the methods to better
understand the basin hydrology in a data scarce region.
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