The flow past basin can introduce the wake and the closed horizontal vortexes at specific height. The structures of such basin-wide circulation are considered through a series of the idealized simulations. Of particular interest are the wake formation, the variation of the horizontal closed vortex, PV generation and PV propagation.
The present work makes a wave comparison between the basin case and the mountain case. Wave blocking produces a wake aloft in the basin case and the wake doesn’t extend throughout the basin, while wave blocking produces wake at the ground in the mountain case. An explanation of basin wake height is discussed. The difference of PV propagation in the basin case and the mountain case is also explored. In the mountain case, the PV tends to extend downstream, but the PV is mostly trapped in the basin case. The factor which decides the PV trapping inside the basin or escaping the basin is examined. Results also exhibit the basin vortex variation with respect to the basin depth and size. The Coriolis effect on the basin vortex is also considered. In the north hemisphere, the increasing Coriolis forcing favors to enhance the positive closed vortex.
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