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Home > Bar (landform)

 
In geography, a bar is a linear shoaling landform feature within a body of water. Bars tend to be long and narrow (linear) and develop where a current (or waves) promote deposition of particles, resulting in localized shallowing (shoaling) of the water. Bars can appear in the sea, in a lake, or in a river. They are typically composed of sand, although could be of any particulate matter that the moving water has access to and is capable of shifting around (for example, soil, silt, gravel, cobble, shingleThe word shingle has several distinct meanings in the English language: A shingle is a flat covering element for a roof. Shingles are laid in overlapping rows, with half the shingle visible and half covered by the one above or by the roof ridge. Other roo, or even boulderIn geology, a boulder is a large rock, greater than 256mm (10") in diameter (see grain size for standards in use). While a boulder may be small enough to move or roll manually, others are extremely massive. Some famous rock formations involve giant bouldes). The size of the particles comprising a bar is related to the size of the waves or the strength of the currents moving the material, but the availability of material to be worked by waves and currents is also important.

The term bar can apply to landform features over a considerable range in size, from just a few meters in a small stream to marine depositions stretching for hundreds of kilometreA kilometre ( American spelling: kilometer (symbol: km is a unit of length equal to 1000 metres. It is approximately equal to 0. 621 miles, 1094 yards or 3281 feet. Slang terms for kilometre include " klick" (or "click") and "kay". Click" is also used fors along a coastUnited States postal stamp. A coast is that part of an island or continent that borders an ocean, gulf, sea, or large lake. In geology and geography, the coast extends inland from the shoreline. The terms coast and coastal refer to the condition of beingline, often called barrier islands. In a nautical sense, a bar is a shoalA shoal is a sandbank or bar creating a shallow., similar to a reefIn nautical parlance, a reef is a rock, sandbar, or other feature beneath the surface of the water, but shallow enough to be a hazard to ships; see also shoal''. Many reefs result from abiotic processes—deposition of sands, wave erosion planning down rock: a shallow formation of (usually) sand that is a groundingGrounding is a common punishment for children or teenagers. In some cases it is suggested as an alternative to corporal punishment in the home. Typically a young person who is grounded is forbidden from leaving the home, except for attending school or col hazard.

1 Sandbars and longshore bars

Bars that occur at or off the shoreline of a sea or a lake are related to beachA beach or strand is a geological formation consisting of loose rock particles such as sand, shingle, or cobble along the shoreline of a body of water. Components Some geologists consider a beach to be just this shoreline feature of deposited material, bues and might be considered offshore features of a beach (Bascom, 1980). At times when larger waves attack the beach berm, some of the beach material is redistributed offshore to become a longshore bar or sandbar, possibly visible at low tide. This bar forms (sometimes seaward of a trough ) where the waves are breaking, because the breaking waves set up a shoreward current with a compensating counter-current along the bottom. Sand carried by the offshore moving bottom current is deposited where the current reaches the wave break (Bascom, 1980). Other longshore bars may lie further offshore, representing the break point of even larger waves, or the break point at low tide.



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Topics: Bar (landform), Sandbars And Longshore Bars, Bars As Geological...

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