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The 4 coastal processes of erosion with timeforgeography.co.uk

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How many ways does erosion take place? Name and describe them.

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How many ways does erosion take place? Name and describe them.

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Draw each process and upload your drawings here.

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Draw each process and upload your drawings here.

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Watch this video and explain what you have learnt to your group members. Summarise what you have learned about longshore drift and describe it in your post. 

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Watch this video and explain what you have learnt to your group members. Summarise what you have learned about longshore drift and describe it in your post. 

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hydraulic action - water is forced into the rock. this squashes the air inside. this air blasts out when wave retreats. this can break the rock apart.

attrition - loose sediment carried by the sea knock into each other, they break down and smaller & more rounded.

abrasion - fragments of rock are picked up and hurled at the cliff by the sea. they scrape and gouge the rock.

solution - chemical action of the seawater where salts in the water can dissolve rocks.

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Hydraulic action - When waves strike against a rock surface, the waves trap air in the rock joints. This air is compressed by the oncoming waves, exerting pressure on the joints. As the air is repeatedly compressed, the joints weaken and the rocks shatter.

Abrasion - As waves break, sediments carried by waves such as sand and rocks are hurled against the coast. The loosened sediments knock and scrape against the coastal cliffs this weakens the surface and breaks down the coast. Overtime, the impact from abrasion is powerful enough to undercut a cliff.

Attrition - When rock particles carried by the waves rub or hit against one another, they break down into smaller pieces and become smoother and more rounded overtime.

Solution - Seawater reacts chemically with water soluble minerals in coastal rocks and dissolves them. For example, limestone rocks are easily eroded by carbonic acid. When solution of minerals occurs, rocks are weakened and eventually disintegrate.

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4 ways. hydraulic action, Attrition, Abrasion, solution

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1. hydraulic action: waves crash against rock and water is forced into the rock. This compresses the air in the rocks and it blasts out when waves retreats. This can break the rock apart.
2. attrition: eroded particles in the water smash into each other and break into smaller pieces. Their edges get rounded off and smaller as they bash into each other.
3. abrasion: fragments of rocks are picked up and hurled at the cliff by the sea, they scrape and rub against the cliff, removing small pieces.
4. solution/corrosion: chemical action/weak carbonic acid in seawater dissolves rock like chalk and limestone.

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Water is forced into the rock. This squashes the air inside. this air blasts out when wave retreats. This can break the rock apart.

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Loose sediment carried by the sea knock into each other, they break down and smaller & more rounded.

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Fragments of rock are picked up and hurled at the cliff by the sea. they scrape and gouge the rock.

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Chemical action of the seawater where salts in the water can dissolve rocks (contains water-soluble minerals)
When solution of minerals occurs, rocks weaken and eventually disintegrate.

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as waves approaches the coasts at an angle break on the breach, sediments move up the beach at an angle. As swash and move perpendicularly down the beach as backwash the resultant zigzag movement along the beach is known as beach drift

When waves approach the coast at an angle, they generate longshore currents in the nearshore zone and move sediments along the shore. Longshore currents are ocean currents that flow parallel to a coast.

The combined effect of sediment movement by longshore currents and beach drifts is known as longshore drifts. Longshore drift is known rapid when waves approach a straight coast at an angle of 30 degrees. Longshore currents also carry different sediments from different beaches.

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1. Hydraulic action: Water is forced into the rock. This squashes the air inside. This air balasts out when waves retreat. This can break the rock apart.

2. Attrition: Loose sedimanets carried by the sea knock into each other, they break down and become smaller and rounded.

3. Abrasion: Fragments of rocks are picked up and hurled at the cliff by the sea. They scrape and gauge the rock.

4. Solution: Chemical action of the sea water where salts in the water can dissolve rocks.

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1) Hydraulic action: Water is forced into the rock. This squashes the air inside. This air blasts out when waves retreats. This can break the rock apart.

2) Attrition: Loose sediment carried by the sea knock into each other, they break break down and become rounded and smaller.

3) Abrasion: Fragments of rock are picked up and hurled at the cliff by the sea. they scrape and gouge the rock.

4) Solution: Chemical action of the sea water where salts in the water can dissolves rocks.

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longshore drift is the movement of sediments along a coast by waves that approach at an angle to the shore but then the swash recedes directly away from it. the water in a longshore current flows up onto the beach, then back into the ocean in a "sheet-like"formation.

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Abrasion

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- ocean waves are the most important force of erosion in pretty much every coastal landscape
- sand particles move from one end to the other, forming a spit
- longshore drift in action: sand moving sideways parallel to the shoreline

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Longshore drift is the zig-zag movement of sediments along a coast by waves that approach at an angle along the coast by the sea.

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Longshore drift is the movement of material along a coast by waves which approaches and gets swept away

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Longshore drift is the movement of material along the shore by wave action. It happens when waves approach the beach at an angle. The swash carries material up and along the beach. The backwash carries material back down the beach at right angles. This is the result of gravity. This process slowly moves material along the beach and provides a link between erosion and deposition.

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waves throw the pebbles up to the top of

the beach but how does it all get here

in the first place the answer is

longshore drift the process depends on

waves hitting the beach at an angle

they do along much of this Coast let's

concentrate on just a few particles the

particles are washed up on the beach by

the waves which driven by the prevailing

wind hit the beach at an angle as the

water runs back it pulls the particles

straight back into the sea under the

force of gravity the next wave moves the

particles a little bit further up the

beach

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Longshore Transport - Let's recap Longshore drift by watching this video

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Summary of Longshore drift - Complete the Longhsore Drift Worksheet.

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Summary of Longshore drift - Complete the Longhsore Drift Worksheet.

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GEOGRAPHY REVISION VIDEOS - The Travelling Teacher

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LONGSHORE DRIFT. Geography Coasts Revision. AQA, Edexcel, OCR. Achieve a GRADE 9!! **SUBSCRIBE NOW**

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Discuss with your group members and answer the questions below in your group post. 

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1. What are some reasons for the man being unable to carry the boxes properly?

2. What should the man do if the boxes are too much and too heavy?
Now think and apply to waves
3. What are some reasons for the wave being unable to carry the sediments?

4. What should the wave ‘do’ if the sediments are too much and too heavy/large?

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Watch the video and explain 1. the relationship between wave energy, swash and deposition 2. identify the types of landforms formed by deposition 3. describe deposition.

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GEOGRAPHY REVISION VIDEOS - The Travelling Teacher

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Coastal Deposition. Geography KS3, GCSE, A' level. AQA, OCR, Edexcel. 9-1. Geography Revision.

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Using information about sediment type and sediment size :
(1)identify the sediment texture. The first one has been done for you.
(2) Decide which sediments are likely to be deposited in:
(a) sheltered coasts and
(b) exposed bays
Give a reason for (a) and (b) to justify your answer.

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1. There are too many boxes stacked on top of one another
2. The man should put some boxes down or else he will break his back (the man should get a mover maybe)
3. The sediments are too heavy/large
4. The wave should wait for their wave friends to help them

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1.He doesnt have much strength due to him being old.
2. he can use a trolley
3. The sediments are too heavy
4. Vorrow help from other waves

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1. There are too many boxes / Boxes are too heavy / Man is WEAK

2. He should some down and carry as much as he can or one at a time.

Now think and apply to waves
3. The waves are too weak / the sediments are too heavy / There are too many sediments

4. The waves should take one sediment at a time / Wait for more waves to helP

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1. there are too many boxes and man cannot balance
2. take one at a time one by one
3.  there too many sediments
4. waves can take a few by few

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1-  There are too many boxes stacked onto each other. Gravity
2- don't carry all the boxes at once
3- there are too many sediments
4- Leave some of the sediments behind :((

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1. They are too heavy
2. He should put the boxes down and carry them one by one
3. The waves are not strong enough
4. Don't need do its job just quit

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1. When wave energy decreases, the waves are unable to carry the sediments hence it will be deposited
2. Beaches, Sand Dunes, Spits, Bars
3. when the swash is stronger than the backwash and deposits sediments

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1. The greater the wave energy, the less the deposition as the waves are able to carry the sediments so there will be more swash
2. shingle beaches, spits, sand dunes
3. Sediments eroded from the coast re transported away and deposited elsewhere. Whn wave energy decreases, the waves are unable to carry these sediements. LARGE sediments are deposited FIRST, followed by smaller sediments. Deposited sediments result in landforms like shingle beaches, sand dunes, spits

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1. The greater the amount of wave energy, the more deposition and swash increases.
2. - sand or shingle beach
- sand dunes
- spits
- bars

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1. As the wave energy increases, the swash will be greater and there will be more deposition
2. spit and sand dunes
3. deposition is the laying down of sediment carried by wind, sea

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as the wave energy increases, the swash get bigger the deposition will be lesser

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shingle beach
dune
spit
bars

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sendiments eroded from the coast are transported away and deposited elsewhere.when wave energy decreases,wave are unable to carry these sediments.

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1.  low wave energy leads to weaker swash and stronger backwash, resulting in more deposition.
2. spit and sand dunes
3. deposition is the movement of sediments being carried by the wind back to the sea

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Fine
Not so fine
Coarse

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1. The greater the wave energy, the less the deposition. The waves are able to carry the sediments hence there will be more swash

2. Shingle Beaches, Spits, Sand dunes

3. Sediments eroded from the coast are transported away and deposited elsewhere. When wave energy decreases, the waves are unable to carry these sediment. Firstly, large sediments will be deposited followed by smaller sediments. Deposited sediments will form landforms such as shingle beaches, sand dunes, spits.

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In deep bays sheltered by headlands, sandy beaches are common. Coarser sediments are likely to settle in more exposed bays where there is higher wave energy to remove the finer sediments

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silt - fine
fine, medium, coarse & very coarse sand - not fine
pebble, cobble, boulder - not fine

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1. smooth (like butter)
medium
coarse
2. sheltered coast: clay and slit
exposed bays: fine, medium, coarse and very coarse sand
pebble, cobble, boulder
the waves got low energy (sheltered)
the waves got high energy (exposed bays)

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1)
Very Fine - Clay
Fine - Silt
Coarse - Fine Sand, Medium Sand, Coarse Sand, Very Coarse Sand
Very Coarse - Pebble, Cobble, Boulder

2a)
Sheltered coast, fine sediments (Clay, silt)
Reason: Areas where coast are sheltered from strong winds, destructive waves are less common.

2b)
Exposed bay, coarser sediments (Pebble, Boulder)
Reason: Due to higher wave energy, to remove the finer sediments.

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1. fine
coarse
very coarse
2(a) Clay, Silt, Fine Sand and Medium Sand
2(b) Coarse Sand, Very Coarse Sand, Pebble, Cobble and Boulder
REASON a):A sandy beach is usually formed in a sheltered bays, where low energy, constructive waves transport material onto the shore The swash is stronger than the backwash so the material is moved up the beach.
b)Coasts of erosion form as a result of high energy waves, large fetch, high exposure and limited deposition.

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1. silt has a very smooth texture
pebble, cobble and boulder has a smooth texture
fine sand , medium sand , course sand and a very course sand have a rough texture

2. (a) fine sand is most likely to be deposited in sheltered coasts, the reason for this is because sheltered coasts will have constructive waves, hence depositing finer sediments.

2. (b) pebbley material is most likely to be deposited in exposed bays

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(a) Fine sediments in sheltered coasts. Since sheltered coasts are areas where the coasts are sheltered from winds, there would be lesser destructive waves.
(b) Coarse sediments in exposed bays. Since exposed bays are not sheltered from winds, there would be more destructive waves.