beach

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beach,

a gently sloping zone where deposits of unconsolidated sedimentssediment,
mineral or organic particles that are deposited by the action of wind, water, or glacial ice. These sediments can eventually form sedimentary rocks (see rock).
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 are subject to wavewave,
in oceanography, an oscillating movement up and down, of a body of water caused by the frictional drag of the wind, or on a larger scale, by submarine earthquakes, volcanoes, and landslides.
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 action at the shore of an ocean or lake. Most of the sediment making up a beach is supplied by rivers or by the erosionerosion
, general term for the processes by which the surface of the earth is constantly being worn away. The principal agents are gravity, running water, near-shore waves, ice (mostly glaciers), and wind.
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 of highlands adjacent to the coast.

Beaches extend from a low waterline landward to a definite change in material or physiographic form, such as the presence of a cliff or dune complex marking a clear demarcation of the edge of a coastcoast,
land bordering an ocean or other large body of water. The line of contact between the land and water surfaces is called the shoreline. It fluctuates with the waves and tides.
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. The surf zone is the area between the landward limit of the waves and where the farthest seaward wave breaks. The foreshore, the active portion of the beach, is a seaward-sloping surface extending from the low tide limit of the beach to the crest of a ridge, called the berm, formed by storm waves. Water motion landward and seaward across the foreshore is called swash and backwash, respectively. The foreshore's slope angle is related to the size of the beach material and the vigor of the waves. The backshore extends landward from the berm as a broad terrace or gently landward-sloping surface, often broken by one or more beach ridges. Seaward of the surf zone is the offshore zone, which commonly contains a trough and an offshore bar where the waves begin to break before reforming and dispensing their energy on the beach. Along low sandy coasts, such as the Eastern coast of the United States, a long, narrow beach, called a barrier beach, is commonly separated from the coast by a narrow lagoon. Where a beach extends from land and terminates in open water it is called a spit or a hook.

Beaches undergo a cyclical migration of sand between the beach and the offshore zone caused by seasonal changes in the supply of sedimentary material and by the changes in intensity and direction of the approaching waves. The action of tides causes daily cycles of cut and fill. Waves approaching the shore obliquely move the sediment along the beach in a zigzag pattern called longshore transport. Since beaches are mobile deposits, they owe their existence to a constant replenishment of sand. In many coastal areas a deficiency in the supply of sand from human intervention or the natural changes in the coastal environment results in serious erosion problems. Artificial replenishment by pumping sand onto the beach from offshore or halting the moving sand from longshore drift by building breakwatersbreakwater,
offshore structure to protect a harbor from wave energy or deflect currents. When it also serves as a pier, it is called a quay; when covered by a roadway it is called a mole.
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 are two solutions to erosional problems.

Bibliography

See W. Bascom, Waves and Beaches: The Dynamics of the Ocean Surface, (1980).

Beach

 

a strip consisting of an accumulation of loose material on the seacoast in the surf zone. There are pebble, gravel, sand, and shell beaches. Morphologically, beaches are divided into those in the form of a gently sloping rampart and those consisting of an accumulation of drift sloping toward the sea and abutting in the back to the foot of the bluff. Owing to the varying velocity of the forward and backward movement of the surf, the size and density of the particles on the beach vary. Favorable conditions lead to the formation of mineral placers (for example, diamonds in southwestern Africa; gold in Alaska; and titanomagnetites in India, China, and Australia). The beaches of health resorts often have facilities for aerotherapy and heliotherapy.

What does it mean when you dream about a beach?

Similar to the meaning of bay, the threshold between the conscious and unconscious mind. To most people, beaches also represent recreation and relaxation. Where we go to absorb the light from the sun. (See also Bay, Sand).

beach

[bēch]
(geology)
The zone of unconsolidated material that extends landward from the low-water line to where there is marked change in material or physiographic form or to the line of permanent vegetation.
(navigation)
To intentionally run a craft ashore, as a landing ship.

beach

an extensive area of sand or shingle sloping down to a sea or lake, esp the area between the high- and low-water marks on a seacoast