2B.5b

Question 1

What does transportation and deposition processes produce

Answer 1

Distinctive landforms:
Beaches,
Recurved and double spit,
Offshore bars
Barrier beaches/bars
Tombolos

Question 2

How is a double spit made and name an example

Answer 2

Poole Harbour
- Lagoon, created by the low-energy tidal environment behind the spit
- Tidal gap – between the two spits, which have formed in different directions. Water moving through/back prevents the two spits meeting

E.g. in Poole Harbour the main longshore drift direction is SW-NE driven round Studland Bay by the prevailing wind, producing a spit from the south.
However, wave refraction around Durlston Head produces wave fronts from NE-SW along the coastline towards the north spit of Poole Harbour, generating a spit from the north.

Question 3

Tombolo and example

Answer 3

Mirissa, Sri Lanka
- Wave refraction – created by the island which is now connected to the mainland. The consequent low energy environment promotes sediment deposition

Question 4

Recurved spit and example

Answer 4

Hurst Castle
- Direction – either because of two dominant winds, of the spit creates wave refraction causing deposition in a different direction
- Marsh – because of the low energy wave environment behind the spit and subsequent flocculation of small clay-particles carried by the river

Question 5

Barrier Beach

Answer 5

Chappaquiddick, USA AND Slapton Ley
Very flat
Origin of beach material – either from the headland, or rolled inland as sea-level has risen.

Question 6

Bayhead beach

Answer 6

• Berm – ridges created by high-tide (the highest points that swash deposit beach material)
• Cusps – steeper beach gradient, so smaller sediment is transported up the beach, whilst backwash removes the larger (a semi-circular depression)

Question 7

refer to a level weebly geo revison

Question 8

What are cuspate forelands

Answer 8

low lying triangular shaped headlands, extending our from a shoreline, formed from deposited sediment.

Question 9

How are cuspate forelands made

Answer 9

• When longshore drift currents from opposing directions converge at the boundary of two sediment cells.
• The sediment is deposited out into the sea by both currents creating a triangular shaped area of deposited material

Question 10

Describe the dungeness Cuspate foreland

Answer 10

Dungeness in Kent.
- It extends for 11 km in a south-easterly direction
- main west-east longshore drift meets north-south longshore drift currents produced by swell waves travelling down the North Sea into the English Channel.

Question 11

What is the structure of the foreland

Answer 11

Dungeness foreland is thought to have been two spits converging at distal ends with a lagoon between that infilled through salt marsh succession, wind deposition and storm beach material being thrown up during storms.

Question 11

What is the structure of the foreland

Answer 11

Dungeness foreland is thought to have been two spits converging at distal ends with a lagoon between that infilled through salt marsh succession, wind deposition and storm beach material being thrown up during storms.