Sediment resuspension events induced by the wake wash of deep-draft vessels |
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| Authors: | Email author" target="_blank">Erwan?GarelEmail author Laura?López Fernández Mike?Collins |
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| Institution: | 1.School of Ocean and Earth Science,National Oceanography Centre Southampton (NOCS),Southampton,UK;2.Instituto de Ciencias del Mar,CSIC,Barcelona,Spain;3.CIACOMAR,University of Algarve,Olh?o,Portugal;4.Marine Research Division,AZTI Tecnalia,Pasaia,Spain |
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| Abstract: | Hydrodynamics and sediment resuspension events, induced at the shoreline by a deep-draft vessel passing nearby, are described.
Measurements (pressure, currents and turbidity) were obtained at 4 Hz, on a lower beach ~50 m from a channel where large car
ferries operate in Wootton Creek, Isle of Wight. The study focuses on a representative 8-min 32-s-long record, during which
two large vessels passed the channel section. At the shore, the passage of each vessel induced a long-period water-level drawdown,
followed by a water-level oscillation (seiche) of similar period, and the short-period waves of the wake. Both drawdowns were
the main constituents of the prevailing wave pattern. The second drawdown was the largest in amplitude, in response to a higher
speed of the ferry, and the influence of the seiche which had been activated during the preceding event. Two successive peaks
of turbidity were observed shortly after this drawdown. Analyses of current velocity and direction indicate that the sediments
resuspended originated from the shallower upper beach. Anthropogenically induced erosion of the foreshore is predicted at
Wootton Creek. |
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