Shallow is an elevation of the bottom in the
sea
The sea, connected as the world ocean or simply the ocean, is the body of salty water that covers approximately 71% of the Earth's surface. The word sea is also used to denote second-order sections of the sea, such as the Mediterranean Sea, ...
,
river
A river is a natural flowing watercourse, usually freshwater
Fresh water or freshwater is any naturally occurring liquid or frozen water containing low concentrations of dissolved salts and other total dissolved solids. Although the ...
,
lake
A lake is an area filled with water, localized in a basin, surrounded by land, and distinct from any river or other outlet that serves to feed or drain the lake. Lakes lie on land and are not part of the ocean, although, like the much lar ...
, which impedes
navigation
Navigation is a field of study that focuses on the process of monitoring and controlling the movement of a craft or vehicle from one place to another.Bowditch, 2003:799. The field of navigation includes four general categories: land navigation, ...
. It is a type of an underwater relief where the depth of the water is low compared to that of the surrounding points.
Usually formed by
sand
Sand is a granular material composed of finely divided mineral particles. Sand has various compositions but is defined by its grain size. Sand grains are smaller than gravel and coarser than silt. Sand can also refer to a soil texture, textur ...
or
pebble
A pebble is a clast of rock with a particle size of based on the Udden-Wentworth scale of sedimentology. Pebbles are generally considered larger than granules ( in diameter) and smaller than cobbles ( in diameter). A rock made predomina ...
deposits, can also be of volcanic origin or the result of human or animal activities.
Stranded near the shore of a reservoir or watercourse is called a
shoal
In oceanography, geomorphology, and geoscience, a shoal is a natural submerged ridge, bank, or bar that consists of, or is covered by, sand or other unconsolidated material and rises from the bed of a body of water to near the surface. It ...
; the shallow ocean area adjacent to the mainland is the
continental shelf.
Shallows can be permanently hidden under water or appear on the surface of the water periodically (for example, during low tide in the seas, changes in the water level in rivers from water content) in the form of islands, sediments, side streams, spits, etc.
On river
shoal
In oceanography, geomorphology, and geoscience, a shoal is a natural submerged ridge, bank, or bar that consists of, or is covered by, sand or other unconsolidated material and rises from the bed of a body of water to near the surface. It ...
s, if possible, to cross the river on foot, or by land transport, arrange fords.
See also
*
Spit (landform)
A spit or sandspit is a deposition bar or beach landform off coasts or lake shores. It develops in places where re-entrance occurs, such as at a cove's headlands, by the process of longshore drift by longshore currents. The drift occurs due ...
*
Rapids
Rapids are sections of a river where the river bed has a relatively steep gradient, causing an increase in water velocity and turbulence.
Rapids are hydrological features between a ''run'' (a smoothly flowing part of a stream) and a ''cascade' ...
*
Reef
A reef is a ridge or shoal of rock, coral or similar relatively stable material, lying beneath the surface of a natural body of water. Many reefs result from natural, abiotic component, abiotic processes—deposition (geology), deposition of ...
*
Ocean bank
An ocean bank, sometimes referred to as a fishing bank or simply bank, is a part of the seabed that is shallow compared to its surrounding area, such as a shoal or the top of an underwater hill. Somewhat like continental slopes, ocean bank sl ...
Bibliography
*
* Jean-Jacques Delannoy, Philip Deline, René Lhénaff, Géographie physique: aspects et dynamique du géosystème terrestre, De Boeck Superieur, 2016, p. 634.
* Republished in 2001 then in 2014 under the title ''Dictionnaire de la mer: savoir-faire, traditions, vocabulaires-techniques'',
Omnibus
Omnibus may refer to:
Film and television
* ''Omnibus'' (film)
* Omnibus (broadcast), a compilation of Radio or TV episodes
* ''Omnibus'' (UK TV series), an arts-based documentary programme
* ''Omnibus'' (U.S. TV series), an educational progr ...
, XXIV-861 p.,
*
Hydrology
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