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Wirlwind
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General term for a small-scale rotating column of air. they can be caused by uneven frictional
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Tidal bore, английский
- Generated in estuaries and rivers with high tidal range and a sharp narrowing and shoaling at the entrance. manifested as a single wave, which may be breaking, that travels along the river or estuary and is followed by a rise in water level. see also bore.
- A phenomenon generated when the leading edge of a rising tide rides over the top of an outflowing river current and moves upstream in the form of a wave. this makes it a true tidal wave (not to be confused with tsunami). these phenomena are relatively rare, occurring only in a few locations where large incoming tides are funneled into a shallow narrowing river via a broad bay. the biggest in north america occurs in the otherwise lazy shubenacadie river, off the bay of fundy where the tidal range is about 12 meters (40 feet). the shubenacadie bore races upstream at a speed as high as 50 km/h (30 mph) and can rise to a height of 5 meters (16 feet) but is usually less. it has claimed the lives of several tourists who were in the riverbed when it came in. the word derives from old norse bara, meaning wave or swell. (also eagre.)
Return period, английский
Expected average interval between the occurrences of events at a particular threshold.
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