Variable-source flood pulsing in a semi-arid transboundary watershed: the Chobe River, Botswana and Namibia.

Environmental Monitoring and Assessment
Narcisa G Pricope

Abstract

The Chobe River, characterized by an unusual flood pulsing regime and shared between Botswana and Namibia, lies at the heart of the world's largest transfrontier conservation area (the Kavango-Zambezi Transfrontier Conservation Area). Significant ecological changes and vegetation conversions are occurring along its floodplains. Various scenarios for agricultural and urban water use are currently being proposed by the government of Botswana. However, the understanding of the river's annual flow regime and timing of the relative contributions of water from three different sources is relatively poor. In light of past and future climate change and variability, this means that allocating water between ecological flows and economic and domestic uses will become increasingly challenging. We reconstruct the inundation history in this basin to help ease this challenge. This paper presents a spatiotemporal approach to estimate the contribution of water from various sources and the magnitude of changes in the flooding extent in the basin between 1985 and 2010. We used time series analysis of bimonthly NOAA AVHRR and NASA MODIS data and climatologic and hydrologic records to determine the flooding timing and extent. The results indicate th...Continue Reading

References

Sep 13, 2003·Science·Douglas E Alsdorf, Dennis P Lettenmaier
Dec 13, 2005·Nature·Mahesh SankaranNick Zambatis
Sep 27, 2008·Annals of Tropical Medicine and Parasitology·C C AppletonS S Mogkweetsinyana

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