Affiliation:
1. Africa Earth Observatory Network (AEON) and Department of Geological Sciences, University of Cape Town, Rondebosch 7701, South Africa.
Abstract
Across Africa, perennial drainage density as a function of mean annual rainfall defines three regimes separated by threshold values of precipitation. This nonlinear response of drainage to rainfall will most seriously affect regions in the intermediate, unstable regime. A 10% decrease in precipitation in regions on the upper regime boundary (1000 millimeters per year) would reduce drainage by 17%, whereas in regions receiving 500 millimeters per year, such a drop would cut 50% of surface drainage. By using predicted precipitation changes, we calculate that a decrease in perennial drainage will significantly affect present surface water access across 25% of Africa by the end of this century.
Publisher
American Association for the Advancement of Science (AAAS)
Reference33 articles.
1. World Bank et al. Poverty and Climate Change: Reducing the Vulnerability of the Poor Through Adaptation (World Bank Washington DC 2003) (http://lnweb18.worldbank.org/ESSD/envext.nsf/46ByDocName/KeyThemesVulnerabilityandAdaptationPovertyandClimateChange).
2. K. J. Gregory, in Geomorphology and Climate, E. Derbyshire, Ed. (Wiley, New York, 1976), pp. 289–315.
3. On the sensitivity of drainage density to climate change
4. River networks of southern Africa: Scaling laws governing their geometry and deviations from scaling
5. A. N. Strachler, Eos38, 913 (1957).
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