Acoustic imaging of cohesive sediment resuspension and re-entrainment in the Changjiang Estuary, East China Sea |
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| Authors: | Z Shi L F Ren S Y Zhang J Y Chen |
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| Institution: | (1) Department of Naval Architecture and Ocean Engineering, Shanghai Jiao Tong University, 1954 Hua Shan Road, Shanghai 200030, P.R. China, CN;(2) Shanghai Acoustics Laboratory, Academia Sinica, 456 Xiao Mu Qiao Road, Shanghai 200032, P.R. China, CN;(3) Institute of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, P.R. China, CN |
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| Abstract: | 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-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.
Received: 26 April 1996 / Revision received: 23 July 1996 |
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