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Topic: Tidal bore


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In the News (Sat 22 Jun 19)

  
  Fundy Forum - What is a tidal bore?
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.
www.fundyforum.com /bore.html   (160 words)

  
  Tidal bore   (Site not responding. Last check: )
A tidal bore (or just bore) is a tidal phenomenon in which the leading edge of the incomming tide forms a wave (or waves) of water that travel up a river against the direction of the current.
A bore occurs in a relatively few locations worldwide, in areas with a large tidal range, only on certain tides, and when an incomming tide is funnelled into a shallow, narrowing river via a broad bay.
A bore is a natural example of a self-reinforcing solitary wave or soliton.
www.serebella.com /encyclopedia/article-Tidal_bore.html   (353 words)

  
 Tidal Bore
The tidal bore in Nova Scotia is a tumbling wavefront that begins to form in the upper end of estuaries like the Avon, Kennetcook, Shubenacadie and Salmon Rivers.
The best tidal bore is produced when a large volume of tidal water is flowing up the river against a small downstream volume and the river gradient is nearly flat..
Because there is a lag in time between energy input and the resulting output, the tidal bore on the largest tide is generally a day or two after a Full or New Moon (study the range section of Sherm's tide graph-August 2007).
www.glinx.com /~sherm/tidal_bore-info.htm   (1881 words)

  
 Tidal Bores   (Site not responding. Last check: )
Called a "tidal bore", this wave illustrates the depth dependance of the wave velocity of waves from the ocean.
The precondition for the creation of a tidal bore is the existence of an outflow current speed from the mouth of a river that exceeds the incoming speed of waves from the ocean associated with the incoming tide.
Tidal bores occur in the Amazon River, the Severn River in England, the Petitcodiac River at the head of the Bay of Fundy, and the Seine, Orne and Gironde Rivers of France.
hyperphysics.phy-astr.gsu.edu /hbase/waves/tidbore.html   (343 words)

  
 Geotimes — July 2005 — Alaska
But for a closer view of the tidal bore, continue to Beluga Point at mile 110 and use their spotting scopes, or forge ahead to mile 96, where an outcropping of bedrock at Bird Point is the perfect place to await the wave.
The tidal change on a typical day is about 30 feet, but the tidal bore that precedes it may not always be the 6-foot-tall wall preferred by surfers.
The best time to view a large tidal bore is within the five-day window around a new or full moon, when there is the greatest difference between high and low tides.
www.geotimes.org /july05/Travels0705.html   (1197 words)

  
 tidal bore- phenomenon
Tidal bore is a solitary wave formed when a rising tidal front tries to enter a shallow and narrowing river with high tidal range from abroad estuary.
Tidal bore or locally known as benak occurs everyday with different wave lengths and heights.
However, based on naked eyes observation, the velocity of the tidal bore is about 7 km/hr to 18km/hr with heights at times reaching to more than 3 metres.
www.did.sarawak.gov.my /benak/Tidal-bore-phenomenon.html   (501 words)

  
 Troubled Times: Tidal Bore
Traveling upstream about two or three times as fast as the normal tidal current, a bore usually is characterized by a well-defined front of one or several waves, often breaking, followed by its main body, which rises higher than the water at its front.
Not arising in estuaries, tidal bores are formed at a position a short distance upstream, where the river channel has become sufficiently narrow or shallow to concentrate the momentum of the rising tide.
The formidable tidal bore that occurs on the Lower Seine in France between Rouen and the sea is known as the Mascaret.
www.zetatalk.com /info/tinfo16b.htm   (258 words)

  
 Legion Magazine : The Tidal Bore
But while the Petitcodiac Tidal Bore is a lot smaller than it used to be, it’s still an intriguing piece of Moncton’s history and continues to draw thousands of tourists to the city each year.
The tidal bore is the front edge of this changing tide, but for many onlookers, the rapid, visible rise in the water level of the Petitcodiac is just as fascinating.
She says the tidal bore is connected to the whole Bay of Fundy experience.
www.legionmagazine.com /features/celebratingcanada/00-11.asp   (2118 words)

  
 Boreriders.com
Boreriders.com will in due course be linked to this repository so that all the information is still available as a resource for bore surfers and tidal bore researchers alike as well as for the general public in search of the natural wonder of the Severn bore.
Everything you may want to know about surfing the Severn bore can be found in the film and extras of the DVD Longwave.
It is literally the only film which both documents world tidal bore surfing upto 2005 and the sub culture of bore surfing along with the only full on guide to surfing the Severn bore and finding the surfable bores of the world.
www.boreriders.com   (283 words)

  
 Riding tides in Europe's rivers, FULL BORE | Surfline
A bore is a tidally generated wave that goes up certain rivers at precise moments.
In Bordeaux, among France's finest vineyards, a "Mascaret" occurs -- a tidal bore that was born 75 miles upriver at the mouth of the Gironde.
Before the passage of the bore, the current intensifies itself towards downstream and then reverses violently once it's passed.
www.surfline.com /surfnews/article_bamp.cfm?id=3966   (659 words)

  
 Tidal Bores What are Tidal Bores Tidal Bore Research Society Tidal Bores and the Bay of Fundy Highest Tides in the ...
The tidal drama in the Bay of Fundy unfolds every 12 hours when the tidal bore ('bore' comes from the Old Norse word 'bara' meaning a wave or swell) forms as the tide enters the Bay and moves toward the rivers which enter it.
The bore can be as little as a small rolling wave or 11 feet in height depending on the size of the tide and the river location.
The size or height of the tidal bore varies according to the phases of the moon.
www.tidalboreraftingpark.com /rafting.php?content=11   (741 words)

  
 Paddler Magazine Online : Hunting Wild Bore
Crawling upriver capsizing boats and scouring the banks, tidal bores are moving waves or holes that rise from the ocean, appearing at full or new moons, their size depending on weather, swell and season.
Tidal bores are rare—there are only about 100 observable bores throughout the world, far fewer of which can be surfed.
Typically, the bore’s leading edge is smooth and glassy where the river is deepest in the middle and breaks along the banks where friction is greater.
www.paddlermagazine.com /issues/2003_3/article_225.shtml   (941 words)

  
 ::: Adventure Tours What is a Tidal Bore? :::
A tidal bore is a natural phenomenon, which is seen in very few parts of the world.
The height of the tidal bore increases with the range of the tide.
The tidal bore on the Shubenacadie River may appear inconsequential compared to the surge of water that follows in its wake.
www.shubie.com /faq01.html   (499 words)

  
 BBC - Gloucestershire - The Severn Bore
A large Bore attracts big crowds so be considerate to the resident population by parking sensibly, not obstructing roads or damaging verges and sticking to footpaths.
The Bore travels at an average speed of 16 kilometres per hour and is strong enough to sweep away cattle and sheep.
Bores on the River Severn happen throughout the year, but it is only the spectacular ones that most people want to see.
www.bbc.co.uk /gloucestershire/interactive/interactive_map/gloucester/severn_bore.shtml   (928 words)

  
 bore. The Columbia Encyclopedia, Sixth Edition. 2001-05
The tidal movement tends to be retarded by friction as it reaches the shallower water and meets the river current; it therefore piles up and forms a low wall of water that moves upstream with considerable force and velocity as the tide continues to rise.
In the mouth of the Amazon River a tidal bore known locally as the pororoca occurs every spring tide.
Bores are found also in the Bay of Fundy, in Solway Firth, in the Severn, Seine, and Hugli rivers, and in Hangzhou Bay.
www.bartleby.com /65/bo/bore.html   (211 words)

  
 Science Question of the Week - Dec. 21, 2001 - tidal bores   (Site not responding. Last check: )
A tidal bore is the leading edge of the rising tide.
It was rather embarrassing to wait for this bore to roar by and then instead see a mere ripple move past by feet - the term "bore" was certainly appropriate.
Across the Atlantic from Nova Scotia, tidal bores occur on a number of rivers in northern Europe, including the Severn River in England and the Seine and Dordogne Rivers in France.
www.gsfc.nasa.gov /scienceques2001/20011221.htm   (991 words)

  
 Surfline | FULL BORE
A bore is a tidally generated wave that goes up certain rivers at precise moments.
In Bordeaux, among France's finest vineyards, a "Mascaret" occurs -- a tidal bore that was born 75 miles upriver at the mouth of the Gironde.
Before the passage of the bore, the current intensifies itself towards downstream and then reverses violently once it's passed.
surfline.com /surfnews/article_bamp.cfm?id=3966   (651 words)

  
 The Slat Rat Chronicles
A tidal bore is a wave generated by a sudden influx of water rushing in to an estuary following low tide.
The prime ingredient for a tidal bore is a coastal tide range in excess of twelve feet.
Big bore tides don't happen very often - the stars (or at least the moon) have to be aligned just so: The high tide needs to be very high, the low tide needs to be very low, and there needs to be a very strong wind blowing from South to North against the incoming tide.
radio.weblogs.com /0104723/2005/06/25.html   (595 words)

  
 ePrintsUQ - Tidal Bore of the Dordogne River (France) on 27 September 2000
A tidal bore is basically a series of waves propagating upstream as the tidal flow turns to rising.
Hubert Chanson observed the tidal bore of the Dordogne river (France) on 27 September 2000.
At St Pardon, the tidal bore of the Dordogne river was an undular bore and the photograph shows the arriving bore with kayaks and surfers riding the bore undulations.
eprint.uq.edu.au /archive/00002989   (346 words)

  
 Science: Did You Know?- A tidal bore is different from a tidal wave. So what's the difference? - AOL Research & Learn
A tidal bore is different from a tidal wave.
A tidal bore is also a wave that can be pretty dangerous, but it is actually caused by tidal movement of water.
The tidal bore was 30 feet high, 200 miles long, and pushed millions of gallons of water per second onto shore, killing about 100 people.
reference.aol.com /mf_science/_a/a-tidal-bore-is-different-from-a-tidal/20050126182309990026   (310 words)

  
 Insight into marine science | Tides | Tidal River Bores
In most tidal rivers the change from ebb to flood is a gradual process.
With the passage of the bore the whole character of the river changes instantly from a calm, tranquil slowly ebbing stream to a turbulent fast flowing river with a strong upstream current.
At Maisemore the sound of the river passing over the weir and the sound of the bore rushing upstream are cancelled instantly as the bore simultaneously drowns the weir and is itself halted.
www.pol.ac.uk /home/insight/riverbores.html   (681 words)

  
 Tsunami-Like River Tides Are Surfing's New Frontier
A tidal bore can travel in excess of 20 miles an hour (30 kilometers an hour) and gets stronger as the river gets narrow and shallower, reaching recorded heights of up to 30 feet (9 meters).
"For a bore to occur, the shape of the river at its estuary—near its mouth—has to be shallow and uniform," with just the right water depth to accommodate the incoming wall of water, Ponce noted.
A discernible head wave is formed and a bore is born.
news.nationalgeographic.com /news/2005/02/0222_050222_tidalbore.html   (559 words)

  
 Television Point | Dictionary | Meaning of bore   (Site not responding. Last check: )
To form or enlarge by means of a boring instrument or apparatus; as, to bore a steam cylinder or a gun barrel; to bore a hole.
To make (a passage) by laborious effort, as in boring; as, to bore one's way through a crowd; to force a narrow and difficult passage through.
To be pierced or penetrated by an instrument that cuts as it turns; as, this timber does not bore well, or is hard to bore.
www.televisionpoint.com /dictionary/default.asp?define=bore   (483 words)

  
 In Nova Scotia, a tidal wonder creates a rafting roller coaster - The Boston Globe
At that critical moment when the sea hits reverse, a large wave called a tidal bore forms at the head of the funnel-shaped Fundy (``bore" comes from the Old Norse word ``bara," meaning a ``wave" or ``swell").
White-water rafters can surf the tidal bore and then ride the roller-coaster rapids created as the incoming water surges over sandbars and gets squeezed by the narrowing riverbanks.
The heights of the tidal bore and rapids vary, depending on the phase of the moon, but typically range from 3 to 12 feet.
www.boston.com /travel/articles/2006/07/19/in_nova_scotia_a_tidal_wonder_creates_a_rafting_roller_coaster   (919 words)

  
 Definition of Tidal bore
As such, it is a true tidal wave (not to be confused with a tsunami).
Bores occur in a relatively few locations worldwide, in areas with a large tidal range, only on certain tides, and when an incoming tide is funnelled into a shallow, narrowing river via a broad bay.
Seine, France, had a significant bore ("le mascaret") until the 1960s, since then it has been practically eliminated by dredging.
www.wordiq.com /definition/Tidal_bore   (348 words)

  
 Iolani School - Tidal Bores Are Not Boring!
Jewitt began with an introduction    to the cause of tidal movements due to the gravitational pulls from the moon.
A tidal bore is an ocean wave from a large body of water that bores its way up a relatively small river pushing water backward toward the land.
  Unlike tidal bores that take place on rivers due to the gravitational pull of the moon, a tsunami is a giant tidal wave usually caused by earth crust movements on the ocean floor.
www.iolani.org /wn_lsacademics_022506tidalbores_ds.htm   (294 words)

  
 Fundy Tidal Bore - NS
The riverbanks at the edge of the bore were alive with muddy foam and spray as the speeding tidewater tried to compress into the river's confined space.
Soon the bore was upon the foremost boats, and I was delighted to see Charlene surfing across it like a pro.
Trans-Canada Highway 104 to Truro Nova Scotia, exit14a to Tidal Bore Road.
www.paddling.net /places/showReport.html?252   (732 words)

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