Bed load as a component of sediment yield from a semiarid watershed of the northern Negev

D. Mark Powell, Ian Reid, Jonathan B. Laronne, Lynne Frostick

Research output: Contribution to journalArticlepeer-review

42 Scopus citations

Abstract

The installation of a fully automatic sediment monitoring station in an ephemeral channel allows the bed load and suspended sediment yields of a dryland stream to be assessed independently using measurements of bed load discharge and suspended sediment concentration obtained during flash floods. The suspended sediment yield of 433 t km-2 year-1 is relatively high, even by global standards. The bed load yield (391 km-2 year-1) is also high but it represents, nevertheless, only 8% of the total sediment yield of 472 t km-2 year-1. The balance between the bed load and suspended load reflects the specific environmental characteristics of the drainage basin. In particular, given that the floods are generated almost entirely by overland flow, the high suspended sediment yield indicates a substantial wash load that results from the plentiful supply of fine material on the sparsely vegetated slopes of the water catchment.

Original languageEnglish
Pages (from-to)389-397
Number of pages9
JournalIAHS-AISH Publication
Volume236
StatePublished - 1 Dec 1996

ASJC Scopus subject areas

  • Oceanography
  • Water Science and Technology

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