Kasei, Raymond Abudu: Modelling impacts of climate change on water resources in the Volta Basin, West Africa. - Bonn, 2010. - Dissertation, Rheinische Friedrich-Wilhelms-Universität Bonn.
Online-Ausgabe in bonndoc: https://nbn-resolving.org/urn:nbn:de:hbz:5N-19772
urn: https://nbn-resolving.org/urn:nbn:de:hbz:5N-19772,
author = {{Raymond Abudu Kasei}},
title = {Modelling impacts of climate change on water resources in the Volta Basin, West Africa},
school = {Rheinische Friedrich-Wilhelms-Universität Bonn},
year = 2010,
month = jan,

volume = 69,
note = {The Volta River Basin is one of the largest river systems in Africa covering an area of approximately 400,000 km2 and shared by six riparian states of West Africa. The semi-arid to sub-humid regions of the basin are climate sensitive. The population is mainly dependent on rainfed agriculture and therefore highly vulnerable to the spatial and temporal variability to rainfall and climate change. Even though the per capita water availability of the basin may be perceived as normal, deforestation, land degradation, and high population growth rate coupled with global climate change promises to exacerbate the growing scarcity on water resources due to climate change, as water supplies are unreliable and insufficient to meet the water demands of the growing population. The basin has experienced prolonged dry seasons when many rivers and streams dried up, and lately flooding due to excessive rainfall.
To assess the impact of plausible global climate change to regional climate as well as land surface andl as to sub-surface hydrology in the region of the Volta Basin, hydrology simulations were performed with the use of calibrated regional climate models.
The WaSiM-ETH hydrological model was calibrated and validated at Pwalugu (north of basin) and Bui (south of basin). Using the WaSiM-simulated water balance for the period 1961-2000 as the basis for comparison, the simulated future (2001-2050) water balance in the Volta Basin shows increases in the mean annual discharge and surface runoff with the regional model MM5 and decreases with the regional model REMO.
The results of the MM5 and WaSiM simulations show an annual mean temperature increase of 1.2°C over the basin. Mean annual precipitation increases for both the north and the south of the basin are projected. The averaged increase over the basin is about 15 %. The simulated mean change in discharge at the subsurface is about 40 % of total rainfall between the periods 1991-2000 and 2030-2039. Consequently, interflow and base flows are expected to increase in the range of 0 and 20 %, respectively.
The results of two ensemble runs of the IPCC scenarios A1B and B1 by REMO applied to WaSiM show an annual mean increase in temperature of 1°C. Precipitation over the basin is expected to reduce between 3 % and 6 % in the period 2001-2050 compared to 1961-2000. An average decrease of 5 % is projected for total discharge with corresponding decreases in surface, lateral and base flows.},

url = {https://hdl.handle.net/20.500.11811/4496}

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