Currents in Stratified Water Bodies 2: Internal Waves

摘要: Wave motions in lakes are primarily initiated by the surface wind stress. The pushes water toward lee-shore, thus displacing and internal stratifying layers along length of basin. When stops, oscillate under action gravity form basin-scale standing wave modes – or seiches about equilibrium position. Seiche-induced subsurface currents lake bed, generating turbulence sustaining a quasi-steady turbulent benthic boundary layer (TBBL) above sediments. In comparison with quiescent interior, relatively energetic fluid mixing occurs TBBL, both weakly stratified hypolomnion perimeter at depth seasonal thermocline. This drives vertical biogeochemical fluxes. degenerate lose their energy through variety mechanisms. Of these, most dominant is frictional drag TBBL acting directly on oscillations. Seiches will also into sub high frequency waves that subsequently propagate to boundaries break as they shoal upon sloping topography; causing locally enhanced resuspension within TBBL.