canyon$11129$ - definizione. Che cos'è canyon$11129$
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Cosa (chi) è canyon$11129$ - definizione

STEEP-SIDED VALLEY CUT INTO THE SEABED OF THE CONTINENTAL SLOPE
Submarine Canyon; Undersea canyon; Sea canyon; Deep sea canyon; Submarine canyons; Abyssal canyon; Shelf-edge canyon
  • Bering Sea showing the larger of the submarine canyons that cut the margin
  • Perspective view shaded relief image of the San Gabriel and Newport submarine canyons off Los Angeles
  • Shaded relief image of seven submarine canyons imaged on the [[continental slope]] off New York, using [[multibeam echosounder]] data, the Hudson Canyon is the furthest to the left
  • The [[Congo Canyon]] off southwestern Africa, about 300 km visible in this view
  • Heavily canyoned northern margin to the Biscay abyssal plain, with the Whittard Canyon highlighted
  • Sketch showing the main elements of a submarine canyon

Urban canyon         
  • In the skimming flow regime, the wind vortex made inside a street canyon, when mean wind direction is perpendicular to the street (after Oke, 1988)
  • The comparison of (a) isolated roughness flow and (b) skimming flow regimes in a street canyon (after Oke, 1988)
PLACE WHERE THE STREET IS FLANKED BY BUILDINGS ON BOTH SIDES, CREATING A CANYON-LIKE ENVIRONMENT
Canyon effect; Urban canyons; Street canyon effect; Street canyon
An urban canyon (also known as a street canyon) is a place where the street is flanked by buildings on both sides creating a canyon-like environment, evolved etymologically from the Canyon of Heroes in Manhattan. Such human-built canyons are made when streets separate dense blocks of structures, especially skyscrapers.
Submarine canyon         
A submarine canyon is a steep-sided valley cut into the seabed of the continental slope, sometimes extending well onto the continental shelf, having nearly vertical walls, and occasionally having canyon wall heights of up to 5 km, from canyon floor to canyon rim, as with the Great Bahama Canyon.Shepard, F.
Marysvale Canyon         
CANYON IN PIUTE AND SEVIER COUNTIES IN UTAH, UNITED STATES
Sevier Canyon
Marysvale Canyon (sometimes referred to as Sevier Canyon) is a canyon in Piute and Sevier counties in southwest Utah, United States which runs north from just north of Marysvale north to the town of Sevier.

Wikipedia

Submarine canyon

A submarine canyon is a steep-sided valley cut into the seabed of the continental slope, sometimes extending well onto the continental shelf, having nearly vertical walls, and occasionally having canyon wall heights of up to 5 km, from canyon floor to canyon rim, as with the Great Bahama Canyon. Just as above-sea-level canyons serve as channels for the flow of water across land, submarine canyons serve as channels for the flow of turbidity currents across the seafloor. Turbidity currents are flows of dense, sediment laden waters that are supplied by rivers, or generated on the seabed by storms, submarine landslides, earthquakes, and other soil disturbances. Turbidity currents travel down slope at great speed (as much as 70 km/h), eroding the continental slope and finally depositing sediment onto the abyssal plain, where the particles settle out.

About 3% of submarine canyons include shelf valleys that have cut transversely across continental shelves, and which begin with their upstream ends in alignment with and sometimes within the mouths of large rivers, such as the Congo River and the Hudson Canyon. About 28.5% of submarine canyons cut back into the edge of the continental shelf, whereas the majority (about 68.5%) of submarine canyons have not managed at all to cut significantly across their continental shelves, having their upstream beginnings or "heads" on the continental slope, below the edge of continental shelves.

The formation of submarine canyons is believed to occur as the result of at least two main process: 1) erosion by turbidity current erosion; and 2) slumping and mass wasting of the continental slope. While at first glance the erosion patterns of submarine canyons may appear to mimic those of river-canyons on land, several markedly different processes have been found to take place at the soil/water interface.

Many canyons have been found at depths greater than 2 km below sea level. Some may extend seawards across continental shelves for hundreds of kilometres before reaching the abyssal plain. Ancient examples have been found in rocks dating back to the Neoproterozoic. Turbidites are deposited at the downstream mouths or ends of canyons, building an abyssal fan.