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Deposition occurs when the sea loses its energy. Waves, tides and local currents combine to drop sand and shingle at particular locations.

Attrition

Air compression

Processes of marine

Deposition

The load carried by the waves is itself worn down by constant rolling and knocking together.

This is why beach pebbles are usually rounded.

Ultimately, sand is formed this way.

Constructive waves allowing sand to settle on the beach

As waves break against the coast, air is trapped and compressed in small crevices in rocks.

When the wave moves away, the air is released.

This expansion and compression shatters rock.

Gently sloping beaches which reduce wave energy

Solution

Salts in sea water can dissolve rock by chemical means.

What was our experiment on solution?

Chalk and limestone coasts are more easily eroded this way.

Give me an example of a chalk coast?

Shelter from strong winds and currents creating calmer seas

Longshore drift

Continued

This is the movement of material along the coast.

It occurs because the coastline is irregular and waves do not brake parallel to the coast, because of wave refraction.

The swash moves sediment up the shore at an angle an the backwash pulls the sediment back out to sea at a right angle to the shore.

The result of longshore drift is that most of the sea's energy is spent moving material up the and down the shore.

Homework

This is why a sandy beach is the nest natural protection a coastline could have from sea erosion.

Breaking waves also produce currents which flow parallel to the shore.

Where the waves brake, known as the surf zone, the water is turbulent and carries fine sand grains in suspension and rolls larger pebbles along the sea floor.

These local currents along the shore can be very powerful and can carry swimmers along parallel to the coast quite quickly.

Hydraulic Action

Processes of marine transport

Huge amounts of material are carried along our coastline each day.

Waves and currents are constantly moving sand along the coast due to a process called longshore drift.

Landforms of marine erosion word search.

I want you to know the key words for the landforms of marine erosion.

The crushing force of tonnes of water in each wave wears the land away.

The pressure exerted by Atlantic waves in water average nearly 10,000kg/m2.

Hydraulic action is most effective on soft coastlines such as Louth, Dublin and Wexford.

Abrasion

Waves throw stones and sand against the coast wearing it away.

Abrasion is most effective at high tide and during storms.

Marine Processes

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