Numerical investigation of internal wave‐induced sediment motion: Resuspension versus entrainment
Year: 2014
Type: article
Abstract: We present numerical simulations of near‐bed instability induced by internal waves shoaling over topography using a model with an explicit representation of the sediment concentration. We find that not all separation bubble‐bursting events lead to resuspension, though all lead to significant transport out of the bottom boundary layer. This transport can significantly enhance chemical exchange across the bottom boundary layer. When resuspension occurs, we find that it is largely due to two‐dimensional evolution of the separation bubble during the bursting process. Three‐dimensionalization occurs once the resuspended sediment cloud is transported out of the bottom boundary layer, and hence, redeposition is strongly influenced by three‐dimensional effects. We derive a criterion for resuspension over a linearly sloping bottom in terms of two dimensionless parameters that encapsulate the sediment properties.
Source: Geophysical Research Letters
DOI: 10.1002/2014gl059826
Authors: Jason Olsthoorn, Marek Stastna
Institution: University of Waterloo
Language: English
Subfield: Oceanography
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2086830267