oa Botswana Notes & Records - Bedload sediment transport in the sand rivers of Botswana

Volume 26, Issue 1
  • ISSN : 0525-5090



Sand rivers are an important resource (in eastern Botswana) for rural water supplies, sand extraction and for impoundment, but little is known of their geological history or long term stability. Experimental work, involving hydrological monitoring, repeated surveys, scour chains and magnetic tracing, carried out by a team from the University of Botswana and the Hebrew University, Jerusalem, on three rivers between 1987 and 1991, suggests that major flood events activate and degrade the sand bed to depths of several decimetres, with aggradation occurring during small flows. The results and implications of this research are discussed.

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