Abstract
Abstract Model studies of two-dimensional, time-dependent, wind-forced, stratified downwelling circulation on the continental shelf have shown that the near-bottom offshore flow can develop time- and space-dependent fluctuations involving spatially periodic separation and reattachment of the bottom boundary layer and accompanying recirculation cells. Based primarily on the observation that the potential vorticity Π, initially less than zero everywhere, is positive in the region of the fluctuations, this behavior was identified as finite amplitude slantwise convection resulting from a symmetric instability. To further support that identification, a direct stability analysis of the forced, time-dependent, downwelling circulation would be useful, but is difficult because the instabilities develop as an integral part of the evolving flow field. The objectives of the present study are 1) to examine the linear stability of a near-bottom oceanic flow over sloping topography with conditions dynamically similar to...
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