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Severn bore
The Severn bore is a tidal bore seen on the tidal reaches of the River Severn in England. It forms somewhat upstream of Sharpness, and can be seen as far upstream as Maisemore and on particularly high tides has been known to reach Upper Lode Lock below Tewkesbury.
== Formation ==
The Severn Estuary, which empties into the Bristol Channel, has the third largest〔http://www.ntslf.org/sharing-knowledge/tides-faq〕 tidal range in the world – about ,〔(【引用サイトリンク】 title= Coast: Bristol Channel )〕 exceeded only by the Bay of Fundy and Ungava Bay, both in Canada. During the highest tides rising water is funnelled up the estuary into a wave that travels upstream against the river current at a speed of 8 to 13 miles per hour. The largest bores occur in spring but smaller ones can be seen throughout the year. The Environment Agency publishes timetables and predictions of bore heights on its website.〔(【引用サイトリンク】 publisher= Environment Agency )〕 Being the onset of the flood tide it is accompanied by a rapid rise in water level which continues for about one and a half hours after the bore has passed. The Severn bore is not a self-reinforcing solitary wave or soliton but rather a shock wave which is formed because the wave is travelling faster than the wave speed in water above the Bore (see tidal bore for more details).
The largest recorded bore was on 15 October 1966, when it reached a height of .〔(Severn Bore website: Facts )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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