Owor, M and Taylor, RG and Tindimugaya, C and Mwesigwa, D (2009) Rainfall intensity and groundwater recharge: empirical evidence from the Upper Nile Basin. ENVIRON RES LETT , 4 (3) , Article 035009. 10.1088/1748-9326/4/3/035009.
Changes in the intensity of precipitation as a result of global warming are expected to be especially pronounced in the tropics. The impact of changing rainfall intensities on groundwater recharge remains, however, unclear. Analysis of a recently compiled data set of coincidental, daily observations of rainfall and groundwater levels remote from abstraction for four stations in the Upper Nile Basin over the period 1999-2008 shows that the magnitude of observed recharge events is better related to the sum of heavy rainfalls, exceeding a threshold of 10 mm day(-1), than to that of all daily rainfall events. Consequently, projected increases in rainfall intensities as a result of global warming may promote rather than restrict groundwater recharge in similar environments of the tropics. Further monitoring and research are required to test the robustness of these findings, but the evidence presented is consistent with recent modelling highlighting the importance of explicitly considering changing rainfall intensities in the assessment of climate change impacts on groundwater recharge.
|Title:||Rainfall intensity and groundwater recharge: empirical evidence from the Upper Nile Basin|
|Open access status:||An open access publication|
|Keywords:||ground water hydrology, hydroclimatology, regional climate change, climatology in global change, WATER-LEVEL, CLIMATE-CHANGE, BALANCE MODEL, LAKE VICTORIA, EAST-AFRICA, UGANDA, PRECIPITATION, CONSTRAINTS, AQUIFER, SYSTEMS|
|UCL classification:||UCL > School of Arts and Social Sciences > Faculty of Social and Historical Sciences > Geography|
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