Coasts 3 Coastal Landscape Development
- Created by: Sana Amran
- Created on: 20-05-19 19:30
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Characteristic Coastal Landscapes
- Coastal landscapes have features that depend on the interactions between:
- Coastal geology
- Climate
- Nature of waves and tides
- Classification of coastlines:
- Concordant/discordant
- Cliffed/flat/graded shorelines
- Emergent/submergent coastlines
- Characteristics depend on:
- high/low energy coast
- Dominated by erosion/deposition
- More or less intensely managed by people
Origin and Development of Landforms of Coastal Erosion
Headlands and Bays:
- Likely to occur along discordant coastlines
- Depends on the geology of the rocks
- components:
-
- Wave refraction
- Erosion of the headland
- Deposition in the bay
-
Cliffs and Wave Cut Platforms:
- Erosion is concentrated at the base of the cliff causing a wave-cut notch and the cliff would collapse
- The cliff line will retreat causing a wave cut platform
Geos, Caves, Blowholes, Arches, Stacks and Stumps:
- geo: along a joint in a cliff, the sea will cut inland, widening the crack to form a narrow, steep-sided inlet
- cave: the cliff is under cut
- blowhole: the cave is extended to the top of the cliff
- arch: if the cave is on a headland, the cave will extend across the headland
- stack: the arch will collapse, due to gravity
- stump: the stack that is eroded
Origin and Development of Landforms of Coastal Deposition
- Occurs when material is accumulated faster than it is removed
- Usually where there is low wave energy or where rapid erosion provides an abundant supply of material
Beach Characteristics:
- beaches:
- where land meets the sea and represent the accumulation of sediment deposited between low spring tides and the highest point reached by storm waves
- berms:
- Beach terraces marking the successively lower high tides as the cycle goes from spring to neap tides
- cusps:
- semi-circular shaped depressions which form…
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