10 Mais incríveis turbilhões e redemoinhos do Mundo

10 Most Notable Maelstroms and Whirlpools of the World
Whirlpool, rotary oceanic current, a large-scale eddy that is produced by the interaction of rising and falling tides. Similar currents that exhibit a central downdraft are termed vortexes and occur where coastal and bottom configurations provide narrow passages of considerable depth. Slightly different is vortex motion in streams; at certain stages of turbulent flow, rotating currents with central updrafts are formed. These are called kolks, or boils, and are readily visible on the surface.

Notable oceanic whirlpools include those of Garofalo (supposedly the Charybdis of ancient legend), along the coast of Calabria in southern Italy, and of Messina, in the strait between Sicily and peninsular Italy. The Maelstrom (from Dutch for “whirling stream”) located near the Lofoten Islands, off the coast of Norway, and whirlpools near the Hebrides and Orkney islands are also well known. A characteristic vortex occurs in the Naruto Strait, which connects the Inland Sea (of Japan) and the Pacific Ocean.

The biggest whirlpool in the world is the Old Sow, the United States. This is a permanent whirlwind, caused by the movement of the tide, generating circular currents. The fastest flow reached 28km / h, and the storm has reached a diameter of 75 meters. A whirlpool can not sink a big ship like in the movies, but can drown a person easily as it did in 2000 in French Pass, New Zealand where several divers died while diving practice on site.

1. Moskstraumen

Moskstraumen in Norway (the original maelstrom), which reaches speeds of 27.8 km/h (17.3 mph)
The original Maelstrom (described by Poe and others) is the Moskstraumen, a powerful tidal current in the Lofoten Islands off the Norwegian coast. The Maelstrom is formed by the conjunction of the strong currents that cross the straits (Moskenstraumen) between the islands and the great amplitude of the tides.

In Norwegian the most frequently used name is Moskstraumen or Moskenstraumen (current of [island] Mosken).

The fictional depictions of the Maelstrom by Edgar Allan Poe and Jules Verne describe it as a gigantic circular vortex that reaches the bottom of the ocean, when in fact it is a set of currents and crosscurrents with a rate of 18 km/h.

2. Saltstraumen

Saltstraumen in Norway, which reaches speeds of 37 km/h (23 mph)
The maelstrom of Saltstraumen is the world's strongest maelstrom and is located 10 kilometres (6 mi) south-east of the city of Bodø, Norway. Its impressive strength is caused by the world's strongest tide occurring in the same location. A narrow channel connects the outer Saltfjord with its extension, the large Skjerstadfjord, causing a colossal tide which in turn produces the Saltstraumen maelstrom.

3. Corryvreckan
Corryvreckan in Scotland, which reaches speeds of 18 km/h (11 mph)
The Corryvreckan is the third largest whirlpool in the world, and is on the northern side of the Gulf of Corryvreckan, between the islands of Jura and Scarba off the coast of mainland Scotland. Flood tides and inflow from the Firth of Lorne to the west can drive the waters of Corryvreckan to waves of over 9 metres, and the roar of the resulting maelstrom can be heard 16 kilometres away.

A documentary team from Scottish independent producers Northlight Productions once threw a mannequin into the Corryvreckan ("the Hag") with a life jacket and depth gauge. The mannequin was swallowed and spat up far down current with a depth gauge reading of 262 metres with evidence of being dragged along the bottom for a great distance.

4. Old Sow

Old Sow is the largest tidal whirlpool in the Western Hemisphere, located off the southwestern shore of Deer Island, New Brunswick, Canada, and off the northeast shore of Moose Island, the principal island of Eastport, Maine.

According to mythical etymology the name "Old Sow" is derived from "pig-like" noises the whirlpool makes when churning; however, a more likely origin is the word "sough" (pronounced "suff"), defined as a "drain", or a "sucking sound". Early settlers to the area may easily have mispronounced "sough", as "sow" (rhyming with "cow") due to its similar spelling to other words with "sow-sound" endings, such as "plough".

The whirlpool is caused by local bathymetry and extreme tidal range where waters exchange between Passamaquoddy Bay and the Bay of Fundy, combined with the unusual topography of the location's sea floor at the confluence of the numerous local currents.

The whirlpools form in an area with a diameter of approximately 250 feet/75 metres, as determined by the president of the Old Sow Whirlpool Survivors' Association in 1997 by way of an aerial photograph. The photograph was calibrated using the Deer Island Point Light beacon tower of known width that was included in the photograph.

5. Naruto whirlpools
Naruto whirlpools
The Naruto whirlpools (鳴門の渦潮 Naruto no Uzushio) are tidal whirlpools in the Naruto Strait, a channel between Naruto in Tokushima and Awaji Island in Hyōgo, Japan.

The strait between Naruto and Awaji island has a width of about 1.3 km (0.81 miles). The strait is one of the connections between the Pacific Ocean and the Inland Sea, a body of water separating Honshū and Shikoku, two of the main islands of Japan. The tide moves large amounts of water into the Inland Sea twice per day and also removes large amounts of water twice a day. With a range of up to 1.7 m (5.6 ft), the tide creates a difference in the water level of up to 1.5 m (4 ft 11 in) between the Inland Sea and the Pacific. Due to the narrowness of the strait, the water rushes through the Naruto channel at a speed of about 13–15 km/h (8–9 mph) four times a day, twice flowing in and twice flowing out. During a spring tide, the speed of the water may reach 20 km/h (12 mph), creating vortices up to 20 m (66 ft) in diameter.

The current in the strait is the fastest in Japan and the fourth fastest in the world after the Saltstraumen outside Bodø in Norway, which reaches speeds of 37 km/h (23 mph), the Moskenstraumen off the Lofoten islands in Norway (the original maelstrom), which reaches speeds of 27.8 km/h (17.3 mph); and the Old Sow whirlpool in New Brunswick, Canada, which has been measured with a speed of up to 27.6 km/h (17.1 mph).

The whirlpools can be observed from ships, or from the Naruto Bridge spanning the strait. The suspension bridge has a total length of 1,629 m (5,344 ft), with the center span over the strait having a length of 876 m (2,874 ft) and a height of 41 m (135 ft) above sea level. A good view is also possible from the shore on Awaji island.

6. Skookumchuck Narrows

Skookumchuck Narrows forms the entrance of Sechelt Inlet on British Columbia's Sunshine Coast in Canada. Before broadening into Sechelt Inlet, all of its tidal flow together with that of Salmon Inlet and Narrows Inlet must pass through Sechelt Rapids. At peak flows, whitecaps and whirlpools form at the rapids even in calm weather. The narrows are also the site of a Skookumchuck Narrows Provincial Park.
Each day, tides force large amounts of seawater through the narrows—200 billion US gallons (760,000,000 m3) of water on a 3-metre (9.8 ft) tide. The difference in water levels on either side of the rapids can exceed 2 metres (6.6 ft) in height. Current speeds can exceed 16 knots (30 km/h), up to 17.68 knots (32.74 km/h). Although it is sometimes claimed to be the fastest tidal rapids in the world, Norway's Saltstraumen reaches speeds of 20 knots (37 km/h).

7. French Pass (Te Aumiti)
French Pass is a narrow and treacherous stretch of water that separates D'Urville Island, at the north end of the South Island of New Zealand, from the mainland coast. At one end is Tasman Bay, and at the other end the outer Pelorus Sound leads out to Cook Strait.
French Pass has the fastest tidal flows in New Zealand, reaching 8 knots (4 m/s). When the tide changes, the current can be strong enough to stun fish. The local tribes are Ngāti Koata and Ngāti Kuia.

8. Falls of Lora

The Falls of Lora in Scotland is a tidal race which forms at the mouth of Loch Etive when a particularly high tide runs out from the loch. They form white water rapids for two to five days either side of the spring tides.

The falls are generated when the water level in the Firth of Lorn (i.e. the open sea) drops below the level of the water in Loch Etive as the tide goes out. As the seawater in Loch Etive pours out through the narrow mouth of the loch, it passes over a rocky shelf which causes the rapids to form. As the tide rises again there is a period of slack water when the levels are the same on either side. However due to the narrow entrance to the Loch, the tide rises more quickly than the water can flow into the Loch. Thus there is still considerable turbulence at high tide caused by flow into the Loch. Thus, unlike most situations where slack water is at high and low tides, in the case of the Falls of Lora slack water occurs when the levels on either side are the same, not when the tidal change is at its least. As a result the tidal range is much greater on the coast than it is inside the loch. A 3 metres (9.8 ft) range at Oban may produce only a 1.3 metres (4.3 ft) at Bonawe on the loch shore.

9. The Bitches in Wales
The Bitches are a tidal race and set of rocks between Ramsey Island and the west Welsh coastline near St. Davids. It is a popular tourist destination and playspot for extreme sports enthusiasts such as whitewater kayakers and surfers.

Water between Ramsey Island and the Welsh coastline along is squeezed over a sea bed that changes height dramatically. During the change of tides this causes the water to flow at a rate of up to 7 knots (13km/h). A set of rocks further constricts the water, especially during higher tides, and this causes hydraulics to form in the shape of glassy standing waves and broken waves (also known as stoppers).

Numerous guidebooks detail the route to The Bitches, but it is not for the inexperienced or unprepared. Not only are the fast flows and hydraulics a danger, but a large underwater spire known as Horse rock causes boils and whirlpools which have sunk boats in the past.

10. Garofalo, Strait of Messina Whirlpool

Homer told tales of Odysseus on a hazardous mystical sea voyage where he encountered two immortal creatures called Scylla and Charybdis. Although not a sea monster, Charybdis lives on in the Strait of Messina and is now called Garofalo. It is here that the sea floor drops considerably and winds flow against the direction of powerful tidal currents to form another oceanographic phenomenon. The Strait of Messina is 1.9 miles wide at its narrowest point with a depth of 830 feet. The maelstrom of Garofalo occurs in the narrow body of water between the southern tip of Calabria and the eastern tip of Sicily, Italy. Dangerous choppy seas and rotating whirlpools can still overturn small sea vessels and the rough broken swells can create substantial navigational hazards for larger ones.

Notable whirlpools in river:
Latvian whirlpool in Daugava River
Now, this is one whirlpool that might just justify the reputation that whirlpools have.

Set in Dviete, Latvia, near the banks of the Daugava River, the video depicts a mysterious whirlpool churning and destroyer.

Powerful whirlpools have killed unlucky seafarers, but their power tends to be exaggerated by laymen. There are virtually no stories of large ships ever being sucked into a whirlpool. Tales like those by Paul the Deacon, Edgar Allan Poe, and Jules Verne are entirely fictional.

There was a short-lived whirlpool that sucked in a portion of Lake Peigneur in Louisiana, United States after a drilling mishap in 1980. This was not a naturally-occurring whirlpool, but a man-made disaster caused by breaking through the roof of a salt mine. The lake then behaved like a gigantic bathtub being drained, until the mine filled and the water levels equalized.



Related Posts Plugin for WordPress, Blogger...