Abstract
Equilibrium and non-equilibrium intrusions released from long, full-depth locks and advancing into linearly stratified ambients are investigated via a vorticity-based modelling approach, for the constant-velocity slumping phase. Non-equilibrium intrusions give rise to an upstream-propagating wave, which we model as a bore. Predictions by the vorticity model agree closely with two-dimensional direct numerical simulation results and earlier experimental and computational data regarding front velocities, current thicknesses as well as the height and propagation velocity of the bore.
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