In long and narrow basins tides can not rotate. In long and narrow basins tides can not rotate. Currents in these basins simply reverse direction between high and low tide, flowing in with the high tide and out with the low tide. Cotidal and corange lines are nearly parallel to each other. Tidal resonance occurs if the period of the basin is similar to the tidal period.
Resonance can greatly enhance the tidal range.
A tidal bore is a wall of water that surges upriver with the advancing high tide.