Acoustic imaging of cohesive sediment resuspension and re-entrainment in the Changjiang Estuary, East China Sea

Vertical profiles of instantaneous cohesive suspension concentration, obtained from an acoustic suspended sediment monitor in the Changjiang Estuary, indicate that near-bed high-concentration suspensions consist of upper and lower high-concentration suspensions, separated by a natural breakpoint at...

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Published in:Geo-marine letters 1997-04, Vol.17 (2), p.162-168
Main Authors: Shi, Z., Ren, L. F., Zhang, S. Y., Chen, J. Y.
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Brackish
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Ren, L. F.
Zhang, S. Y.
Chen, J. Y.
description Vertical profiles of instantaneous cohesive suspension concentration, obtained from an acoustic suspended sediment monitor in the Changjiang Estuary, indicate that near-bed high-concentration suspensions consist of upper and lower high-concentration suspensions, separated by a natural breakpoint at ca. 2 g l super(-1). Acoustic images revealed near-bed high-frequency resuspension events of a few seconds, which contribute mainly to the formation of the lower near-bed high-concentration suspension. Upper and lower lutoclines are also indicative of re-entrainment of lower and upper high concentration suspension, respectively. Near-bed high-frequency resuspension is caused by turbulence, while re-entrainment is probably attributable to internal wave activity.
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subjects Brackish
title Acoustic imaging of cohesive sediment resuspension and re-entrainment in the Changjiang Estuary, East China Sea
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