Coastal Processes: Deposition Flashcards

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What is deposition in coastal processes?

Deposition is the process of the ocean dropping or depositing the material it carries, occurring when the water flow slows down, typically in areas with constructive waves.

What causes deposition to occur?

Deposition occurs when the velocity of the water slows down, reducing its ability to carry sediment, which is then dropped onto the ground.

This can be increased by a lack of wind and sheltered areas like bays and shallow waters.

What are spits and how are they formed?

Spits are extended stretches of beach material that stick out into the sea and are formed by Longshore Drift.

When the waves run out of energy or are disrupted by another body of water, the material is deposited, forming a spit over time.

What are bars and how do they form?

Bars are ridges of sand or shingle that join two headlands on either side of a bay.

They form when Longshore Drift transports sediment to a bay, and the waves lose energy due to shelter and lower energy levels, depositing material between the headlands.

How do constructive waves contribute to deposition?

Constructive waves carry material with a strong swash and weak backwash.

The swash deposits material onto the coastline, which is not removed by the backwash, leading to the growth and creation of beaches.

What is Longshore Drift and its role in deposition?

Longshore Drift is the process of sediment transport along the coastline by waves that approach at an angle.

It moves sediment sideways in a zigzag pattern, contributing to the formation of depositional landforms like spits and bars.

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