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Encyclopedia > Tidal bore
The tidal bore in Upper Cook Inlet, Alaska
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The tidal bore in Upper Cook Inlet, Alaska

A tidal bore (or just bore, or eagre) 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 or narrow bay against the direction of the current. As such, it is a true tidal wave (not to be confused with a tsunami). Download high resolution version (1768x960, 1195 KB)The tidal bore in Turnagain Inlet. ... Download high resolution version (1768x960, 1195 KB)The tidal bore in Turnagain Inlet. ... Cook Inlet, showing Knik and Turnagain Arms The Cook Inlet or Nuti Inlet is a large inlet of the Gulf of Alaska in south-central Alaska. ... The tide is the regular rising and falling of the oceans surface caused by changes in gravitational forces external to the Earth. ... The tsunami that struck Malé in the Maldives on December 26, 2004. ...


Bores occur in relatively few locations worldwide, usually in areas with a large tidal range, and where incoming tides are 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. In fluid dynamics, a shock wave is a nonlinear or discontinuous pressure wave. ... The WAVES were a World War II era division of the U.S. Navy that consisted entirely of women. ... A soliton is a self-reinforcing solitary wave caused by nonlinear effects in the medium. ... Surfing outside Kaneohe Bay, Hawai‘i. ...


The word bore derives through Old English from the Old Norse word bara, meaning a wave or swell. Old English (also called Anglo-Saxon) is an early form of the English language that was spoken in parts of what is now England and southern Scotland between the mid-fifth century and the mid-twelfth century. ... This is the approximate extent of Old Norse and related languages in the early 10th century. ...


Rivers that have been known to exhibit bores include:


Asia

World map showing location of Asia Asia is the central and eastern part of Eurasia, defined by subtracting Europe from Eurasia. ... The Brahmaputra is one of the major rivers of Asia. ... The amazon (Sindh darya), known as Sindhu to Indians and in Sanskrit, as Sinthos in Greek, and Sindus in Latin, is the principal river of Pakistan. ... The Qiantang River is a river that passes through Hangzhou, the capital of Zhejiang, a province in China. ...

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.

South America South America is a continent crossed by the equator, with most of its area in the Southern Hemisphere. ... Length >6,400 km Elevation of the source 5,597 m Average discharge 219,000 m³/s Area watershed 6,915,000 km² Origin  Nevado Mismi Mouth  Atlantic Ocean Basin countries Brazil (62. ... The pororoca is a tidal bore up to 4 meters high that travels upstream the Amazon River. ...

North America

Tidal bore on the Petitcodiac River
Tidal bore on the Petitcodiac River

World map showing location of North America A satellite composite image of North America North America is a continent in the northern hemisphere, bounded on the north by the Arctic Ocean, on the east by the North Atlantic Ocean, on the south by the Caribbean Sea, and on the west... Tidal bore at Moncton. ... Tidal bore at Moncton. ... The Petitcodiac River courses through Moncton, New Brunswick and Dieppe, New Brunswick in Canada, into Shepody Bay on the Bay of Fundy. ... The Bay of Fundy is a bay located on the Atlantic coast of North America, on the northeast end of the Gulf of Maine between the provinces of New Brunswick and Nova Scotia. ... Motto: Spem reduxit (Hope was restored) Other Canadian provinces and territories Capital Fredericton Largest city Saint John Lieutenant Governor Herménégilde Chiasson Premier Bernard Lord (PC) Area 72 908 km² (8th) Land 71 450 km² Water 1 458 km² (2. ... In modern usage, a causeway is a road elevated by a bank, usually across a broad body of water or wetland. ... Motto: Munit Haec et Altera Vincit (One defends and the other conquers) Other Canadian provinces and territories Capital Halifax Largest city Halifax Lieutenant Governor Myra Freeman Premier John Hamm (PC) Area 55,283 km² (12th) Land 53,338 km² Water 1,946 km² (3. ... Cook Inlet, showing Knik and Turnagain Arms The Cook Inlet or Nuti Inlet is a large inlet of the Gulf of Alaska in south-central Alaska. ...

Europe

World map showing location of Europe When considered a continent, Europe is the worlds second-smallest continent in terms of area, with an area of 10,600,000 km² (4,140,625 square miles), making it larger than Australia only. ... Old Dee Bridge, River Dee, Chester, England (2002) The River Dee (Welsh: Afon Dyfrdwy) is a 70 mile (110 km) long river, which rises in Snowdonia, Wales and discharges to the sea a few miles west of Liverpool. ... National motto: Cymru am byth (Welsh: Wales for ever) Waless location within the UK Official languages English, Welsh Capital Cardiff Largest city Cardiff First Minister Rhodri Morgan Area  - Total Ranked 3rd UK 20,779 km² Population  - Total (2001)  - Density Ranked 3rd UK 2,903,085 140/km² Ethnicity: 97. ... Royal motto (French): Dieu et mon droit (Translated: God and my right) Englands location within the UK Official language English de facto Capital London de facto Largest city London Area - Total Ranked 1st UK 130,395 km² Population - Total (mid-2004) - Density Ranked 1st UK 50. ... Ferry across the Mersey, June 2005 The River Mersey is a river in the north west of England. ... The Severn Bridges crossing near the mouth of the River Severn The River Severn (Welsh: Afon Hafren) is the longest British river, at 354 kilometres (219 miles) long; it rises at an altitude of 610 metres on Plynlimon near Llanidloes, in the Cambrian Mountains, Mid Wales, and it passes through... The River Trent is one of the major rivers of England. ... Humber is also the name of one of the ranges of cars manufactured by the Rootes Group Humber is also the name of a river in Newfoundland, Canada, as well as a river and a college, both in Toronto, Ontario, Canada. ... The River Parrett has its source in the springs in the hills around Cheddington in Dorset in England and flows west through the Somerset Levels to its mouth in the Bristol Channel at Burnham on Sea a town on the edge of Bridgwater Bay, an important Nature Reserve. ... The River Kent is a short river in the county of Cumbria in England. ... The Great Ouse at St Neots The River Great Ouse is a river in the east of England. ... The River Eden is a river in Cumbria, England that flows through Carlisle on its way into the Solway Firth. ... The River Esk is a river in Dumfriesshire, Scotland that flows into the Solway Firth. ... Royal motto: Nemo me impune lacessit (Latin: No one provokes me with impunity) (Scots: Wha daur meddle wi me) Scotlands location within the UK Languages with Official Status1 English Gaelic Capital Edinburgh Largest city Glasgow First Minister Jack McConnell Area - Total - % water Ranked 2nd UK 78,782 km² 1. ... The Dordogne is a river in south-central France. ... The Garonne (Latin: Garumna, Occitan: Garona) is a river in southwest France, with a length of 575 km (357 miles). ... This article is about the river in France. ... The 1960s, or The Sixties, in its most obvious sense refers to the decade between 1960 and 1969, but the expression has taken on a wider meaning over the past twenty years. ...

Oceania


  Results from FactBites:
 
Fundy Forum - What is a tidal bore? (160 words)
A tidal bore (bore = crest or wave) is a natural phenomenon which is seen in a very few parts of the world.
A tidal bore is a wall of water that moves up certain low-lying rivers due to an incoming tide.
Tidal bores form when an incoming tide rushes up a river, developing a steep forward slope due to resistance to the tide's advance by the river, which is flowing in the opposite direction.
  More results at FactBites »

 
 

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