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Tidal bore

From Academic Kids

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Turnagain-bore.jpg
The tidal bore in. Upper Cook Inlet, Alaska

A tidal bore (or just bore) is a tidal phenomenon in which the leading edge of the incoming tide forms a wave (or waves) of water that travel up a river against the direction of the current. As such, it is a true tidal wave (not to be confused with a tsunami).

Bores occur in a relatively few locations worldwide, in areas with a large tidal range, only on certain tides, and when an incoming tide is funnelled into a shallow, narrowing river via a broad bay. Bores take on various forms, ranging from a single breaking wavefront - effectively a shock wave - to 'undular bores' comprising a smooth wavefront followed by a train of solitary waves (solitons). Larger bores can be particularly dangerous for shipping, but also present a challenge to surfers.

The word bore derives through Old English from the Old Norse word bara, meaning a wave or swell.

Rivers that have been known to exhibit bores include:

Asia

South America

  • Amazon River, up to 4m (12 feet) high, running at up to 25 km per hour (15 miles per hour). It is known locally as the pororoca.

North America

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Tidal_bore.jpg
Tidal bore on the Petitcodiac River

Europe

Oceania

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