Journal
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
Volume 47, Issue 10, Pages 1881-1897Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0967-0637(00)00003-0
Keywords
critical shear velocity; continental margin; aggregate resuspension
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Sediment erosion thresholds and characteristics of resuspended aggregates were experimentally determined on cores from the western European continental margin with a ship-borne erosion chamber augmented by image analysis. Bottom sediments (212-4940 m water depth) had a thin surface layer that was resuspended as aggregates (median diameter 125-2403 mu m) under critical shear velocities (u(*c)) of 0.4-1.2 cm s(-1). For the underlying sediments, eroded as primary particles, u(*c) increased with water depth from 0.7 cm s(-1) (sandy shelf sediments) to 2.1 cm s(-1) (lower slope sediments). A two-layer concept of the sediment interface is discussed which distinguishes between an underlying sediment layer, bound by both physico-chemical and biological adhesion and a more easily resuspendable surface aggregate layer. The surface layer consists mainly of aggregates in the 140-450 mu m size range and is resuspended at mean thresholds u(*c) of 0.8-0.9 cm s(-1). These aggregates can subsequently be transported in tide-related resuspension-deposition loops over long distances. (C) 2000 Elsevier Science Ltd. All rights reserved.
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