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Very high rates of bedload sediment transport by ephemeral desert rivers

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Abstract

GEOMORPHOLOGISTS have thought for some time that rates of sediment transfer might differ markedly in ephemeral and perennial rivers, and have used this idea to explain both the changing character of sedimentary successions and the morphology of rivers in sub-humid or semi-arid areas that have experienced significant shifts in climate during the Quaternary period1−5. But until now there has been a lack of suitable field data to confirm this suggestion, mainly because floods in arid zones are infrequent and unpredictable. Here we present bedload sediment transport data for an ephemeral river in Israel, which show it to be, on average, as much as 400 times more efficient at transporting coarse material than its perennial counterparts in humid zones. This suggests that existing predictive sediment transport equations24, developed and calibrated exclusively with data obtained in perennial rivers, are inadequate for application to rivers in arid environments. It also suggests that areas that are at risk of shifting from sub-humid to semi-arid conditions as a result of prospective global changes in climate may suffer severe sedimentation problems.

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Authors and Affiliations

  1. Department of Geography and Environmental Development, Ben Gurion University of the Negev, Beer Sheva, 84105, Israel

    Jonathan B. Laronne

  2. Department of Geography, Loughborough University of Technology, Loughborough, LEU 3TU, UK

    lan Reid

Authors
  1. Jonathan B. Laronne
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  2. lan Reid
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Laronne, J., Reid, l. Very high rates of bedload sediment transport by ephemeral desert rivers. Nature 366, 148–150 (1993). https://doi.org/10.1038/366148a0

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  • DOI: https://doi.org/10.1038/366148a0

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