HR: 1340h
AN: OS23A-1533    [Abstracts]
TI: A comparison of resuspension mechanisms due to internal waves from nonhydrostatic numerical simulations
AU: * Stastna, M
EM: mmstastn@math.uwaterloo.ca
AF: Department of Applied Mathematics, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1 Canada
AU: Lamb, K
EM: kglamb@math.uwaterloo.ca
AF: Department of Applied Mathematics, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1 Canada
AB: Vertically trapped internal gravity waves, both solitary and otherwise, can induce boundary layer instabilities that, in turn, can both resuspend sediment and maintain a sediment concentration in the water column. In this talk we discuss nonhydrostatic numerical simulations of boundary layer instabilities in the footprint of internal waves for a variety of situations. In particular, we contrast our previous work on resuspension due to a solitary wave of elevation propagating against a barotropic current with the boundary layer instability and sediment resuspension due to topographically generated internal waves during the generation process. Furthermore, we contrast the above mentioned large scale instabilities with the small scale instabilities due to the interaction of an internal wave with a rough bottom when no background current is present. We will comment on the numerical challenges intrinsic in the problem and comment on future work needed to simulate the resuspension through a full tidal cycle. Time permitting, we will discuss the boundary layer instabilities and sediment resuspension beneath shoaling internal solitary waves of depression.
DE: 4211 Benthic boundary layers
DE: 4544 Internal and inertial waves
DE: 4558 Sediment transport (1862)
SC: Ocean Sciences [OS]
MN: Fall Meeting 2005