bays when the incoming tide travels upstream against the current. A tidal bore advancing into shallow upstream water typically shows a large and steep elevation difference, whereas a tidal bore entering deep upstream water may have a small elevation difference and an undulating wavefront. In both cases, the bore moves at the speed characteristic of waves in water of the depth immediately behind the wavefront.

In a frame of reference moving with a surge, the surge is equivalent to a stationary jump.

The Bélanger equation and the Froude number

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