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The Severn bore is a tidal bore seen on the tidal reaches of the River Severn in south western England. It is formed when the rising tide moves into the funnel-shaped Bristol Channel and Severn Estuary and the surging water forces its way upstream in a series of waves, as far as Gloucester and beyond.
[10] [11] This funnel shape, large tidal range, and the underlying geology of rock, gravel and sand, produce strong tidal streams and high turbidity, giving the water a notably brown coloration. During the highest tides, rising water is funnelled up the estuary into the Severn bore , a self-reinforcing solitary wave that travels rapidly ...
Tidal power stations by definition require that the tide flows through the barrage, but the tidal range in the Severn would be halved. [55] There are claims that the migration of fish would be hampered, but these are contested. The Severn bore would also be eliminated.
A phenomenon associated with the lower reaches of the Severn is the tidal bore, [35] which forms upstream of the port of Sharpness. It is frequently asserted that the river's estuary, which empties into the Bristol Channel, has the second largest tidal range in the world—48 feet (15 m), [36] [37] exceeded only by the Bay of Fundy.
A bore in Morecambe Bay, in the United Kingdom Video of the Arnside Bore, in the United Kingdom The tidal bore in Upper Cook Inlet, in Alaska. A tidal bore, [1] often simply given as bore in context, is a tidal phenomenon in which the leading edge of the incoming tide forms a wave (or waves) of water that travels up a river or narrow bay, reversing the direction of the river or bay's current.
To the northeast of the River Parrett's mouth, the Bristol Channel becomes the Severn Estuary, which has a tidal range of 14 metres (46 ft). [19] The rate and direction of flow of the Parrett is therefore dependent on the state of the tide on the River Severn. In common with the lower reaches of the River Severn, the Parrett experiences a tidal ...
Though it is often said, the 'fact' that the Severn has the second highest tidal range is not borne out by modern research which shows that the Bay of Fundy and Ungava Bay in Canada vie for top spot, pushing the Severn into third place. Canadian (Hydrographic Survey), American (NOAA) and British (National Oceanography Centre) sources agree on ...
More recently, the Severn Tidal Power Feasibility Study was launched in 2008 by the British Government to assess all tidal range technologies, including barrages, lagoons and others. [26] The study will look at the costs, benefits and impacts of a Severn tidal power scheme and will help Government decide whether it could or could not support ...