Landforms
- Created by: KarolK
- Created on: 01-05-18 18:58
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- Landforms
- Deposition
- Spit
- 1) accumulation of sand, one end attached to land and other reaching across estuary or sea
- 2) Lots of sediment transported by long shore drift due to prevailing wind (state direction ie south west) + coastline changes direction to leave a shallow area of water
- 3) Increase in friction cause more deposition in water sheltered by headland + spits extends in length
- 4) If wind changes the waves it causes spit to make a curve end inland
- 5) Salt marsh develops behind spit because lower energy environment allows deposition of fine materials to occur + can't grow across estuary due to water, that carries material to sea
- Tombolo
- Spit joins mainland to an island
- Chesil beach in Dorset joined to Isle of Portland
- Bar
- Spit joins mainland to another mainland across a bay
- Beaches
- Form in sheltered environments
- When swash is stronger than the backwash, deposition occurs.
- Dune
- Sand from offshore bars blown onto shore by strong winds
- Spit
- Erosion
- Bay
- Destructive waves erode soft rock (hydraulic action) and backwash sediment away
- Headland
- Physical weathering of hydraulic action - sea forces erosion on less resistant rock so rock falls
- Sea attacks section with alternate bands of soft + hard rock
- Caves
- lines of weakness like faults appear in headland (cliff face) Abrasion, attrition and hydraulic action erode fault to make cave
- Arches
- Cave is widened by further erosion. Sea cuts to make an arch and then erodes foot of it
- stacks
- Roof of arc is heavy and collapses
- Part of former cliff isolated as stack and overtime it's undercut and collapses
- stumps
- It's the remains of an eroded stack
- wave cut platform
- 1) Waves attack base of cliff through abrasion, corrosion, hydraulic action + attrition
- 2) Over time cliff is undercut and wave cut notch is made
- 3) Cliff becomes unstable and collapses - further retreat forms a wave- cut platform
- Bay
- Deposition
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