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Behaviour of a puff of resuspended sediment: a conceptual model

Abstract : The particulate matter concentration above the seabed is usually assumed to decrease with height, following an exponential or Rouse profile. Many particulate matter concentration profiles with a peak were found on the North Mediterranean bottom water at a few tens of metres above the bottom. A particle size signal at the same altitude was found in this area and on the New York Bight shelf. It is assumed that this unexpected shape is due to a cloud of resuspended cohesive sediments originating from an impulse resuspension process. A simplified three-dimensional numerical model is proposed to describe the behaviour of resuspended particulate matter that originates from a sediment impulse vertically injected in the bottom water. This model reproduces the concentration profile shape observed, and it gives indications concerning the length and time characteristics of such a cloud, depending on the water velocity and bottom boundary layer properties.
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Contributor : Sylvain Guillou Connect in order to contact the contributor
Submitted on : Sunday, September 29, 2019 - 8:59:44 AM
Last modification on : Tuesday, October 19, 2021 - 11:34:51 PM

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J.C. Brun-Cottan, Sylvain Guillou, Z.H. Li. Behaviour of a puff of resuspended sediment: a conceptual model. Marine Geology, Elsevier, 2000, 167 (3-4), pp.355-373. ⟨10.1016/S0025-3227(00)00027-X⟩. ⟨hal-02299983⟩



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