Tidal bore formation occurs where a large tidal range forces an incoming tide up a shallow, narrowing river mouth or estuary fast enough that the leading edge of the tide steepens into a single wave or a train of waves that travels upstream against the river own current. It requires a specific combination of a very large tidal range, a funnel-shaped estuary that concentrates the incoming water, and a shallow riverbed, conditions met at only a few dozen rivers worldwide, the Qiantang River bore in China and the Severn bore in England among the most powerful.
Facts
Process Type TimescaleRecurs on the twice-daily tidal cycle, with the largest bores concentrated around the new and full moon spring tides. 1 Sources
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