Tidal wave

January 18, 2007

severn bore
Images by Chris Witts from here

The old “tidal wave” word is now best described as a tidal bore (save confusin with tsunamis). There is a Severn Bore which can be surfed check out the Bore Riders Club

“When the boar comes, the stream does not swell by degrees, as at other times, but rolls in with a head…foaming and roaring as though it were enraged by the opposition which it encounter”

Thomas Harrel 1824

 curling bore wave

Also from the Severn Bore site:

The Severn Bore is one of Britain’s few truly spectacular natural phenomena. It is a large surge wave that can be seen in the estuary of the River Severn, where the tidal range is the 2nd highest in the world, being as much as 50 feet (approx. 15.4m).

As many as 60 bores occur throughout the world where the river estuary is the right shape and the tidal conditions are such that the wave is able to form. The Severn Bore (one of 8 in the UK) is one of the biggest in the world but bores also occur on the Seine and Gironde in France, on the Indus, Hooghly and Brahmaputra in India, on the Amazon in Brazil, on the Petitcodiac, New Brunswick, and also the Knik Arm bore at the head of Cook Inlet, Alaska.

By far the biggest bore in the World is the Ch’ient’ang’kian (Hang-chou-fe) in China. At spring tides the wave attains a height of up to 25 ft (7.5 m) and a speed of 13-15 knots (24-27 km/h). It is heard advancing at a range of 14 miles (22 km).

watch a clip of the chinese tidal wave bursting over the water defences


2 Responses to “Tidal wave”

  1. Wenley Says:

    Excellent footage, Kieran. Thanks!

  2. Hey Wenley,
    did you get that book yet? If not it should arrive soon.
    Best wishes kieran

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