Erosional processes
- Created by: Neha_mali
- Created on: 13-01-20 12:22
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- erosional processes
- how they are influenced by:
- wave type
- constructive
- strong swash, weak back wash
- low wave height, long wavelength
- low frequency
- depositional
- drops more sediment than it erodes
- low energy coastline associated w/ weaker waved, deposition exceeds the rate of erosion
- destructive
- strong backwash, weak swash
- high wave height, short wavelength
- high frequency
- erosional
- erodes more than it deposits
- high energy coastline associated w/ powerful waves, erosion rate increase
- constructive
- size
- sediment
- smaller sediment more evident where more erosion has occurred, visa versa
- waves
- high energy waves have a high wave height and short wavelength
- low energy waves have a low wave height but long wavelength
- sediment
- lithology
- permeable
- allows water to easily flow through meaning it erodes in the gaps as well as outside
- weaknesses
- weaknesses
- water can get into cracks and erode out, increases erosion
- not many weaknesses
- few cracks so harder for water to enter and erode, decreases erosion
- weaknesses
- reactivity
- highly reactive
- more suceptible to chemical weathering e.g. limestone
- highly reactive
- clastic or crystalline?
- clastic
- made up of smaller rocks broken rocks that erode more easily
- crystaline
- have interlocking crystals that are harder to erode
- clastic
- permeable
- wave type
- erosional features created
- wave cut notch and platforms
- marine erosion attacks base of a cliff
- notch of eroded material between high and low tide height is created
- as notch deepens the cliff face becomesunstable
- falls under its own weight through mass movement
- platform of unaffected cliff base under notch is left behind
- cliffs
- through process of repeat wave-cut notches and platforms, new cliff faces are created whilst last retreats
- cave-arch-stack stump sequence
- occurs on pinnacle headlands
- marine erosion widens faults in base of headland, widening over time to form cave
- cave widens due to marine erosion & sub-oriel processes
- erodes to the other side of the headland, creates an arch
- arch keeps widening till is can't support itself
- falls under its own weight, leaving a stack
- one side of arch gets detached from mainland
- marine erosion at the back of the stack, it will eventually collapse into a stump
- wave cut notch and platforms
- processs
- hydraulic action
- this is the power of the waves when they hit a cliff
- air is forced into the cracks the rock causing them to break apart
- attrition
- rock fragments in the sea knock against each other getting smaller
- abrasion
- pebbles grind over a rocky platform getting smoother
- corrasion
- fragments of rock are picked up and thrown at cliffs eroding the rock
- hydraulic action
- how they are influenced by:
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