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Fieldtrip Cases (processes (EROSION- (marine- more effect on cliff foot)-…
Fieldtrip Cases
processes
EROSION- (marine- more effect on cliff foot)- Hydraulic Action, Abrasion, Wave Pounding, Wave Quarrying, Cavitation, Attrition
WEATHERING- (sub-aerial- more effect on cliff face)- Wetting and Drying, Insolation, Solution, Freeze-Thaw, Hydrolysis, Carbonation, Hydration
MASS MOVEMENT- landslides, rockfall, slumping
DEPOSITION AND TRANSPORTATION- fluvial sediment via Longshore Drift
processes
DEPOSITION
EROSION- by wind (aeolian)
LONGSHORE DRIFT AND ONSHORE, OFFSHORE MOVEMENT
geology
Magnesium Limestone underneath Boulder Clay/ Glacial Till
MgL is reasonably resistant and glacial till is the most vulnerable. The rocks have a seaward dip so are more vulnerable to erosion
factors
Fetch
Geology
Dominant Wind
Aspect (ENE)
Wind Direction (SW)
management
Sea wall, Groynes, Rock Armour
sand dune variation inland
increased vegetation coverage
decrease in marram grass as pioneer species that can tolerate hostile conditions
increase in other species to replace marram grass
decrease in PH of soil
increase in soil moisture as more tolerable for plants
increase in organic matter as more vegetation
decrease in the gradient of dunes as most sand input on first dune
decrease in wind speed as more sheltered
SEAHAM BEACH- composed of sand and shingle
church, residential areas, Seaham hall and road need protection
landforms: cave, arch, headland, bay, wave-cut platform, shingle beach, sand beach, berm, ridges, runnels and cusps
POSITIVE- erosion creates weaknesses which creates cliff retreat
NEGATIVE- mass movement creates a barrier to behind rocks which decreases erosion
smaller particles are found in the swash zone as there is more attrition and larger particles are found in the backshore zone from rockfall or storm waves. Larger as infiltration of backwash causes it to lack power
larger the particle size, steeper the beach
part of sediment cell 1b
landforms: beach, sand dunes
SEATON CAREW
rock armour is used to protect the sea wall as walls are very expensive and they are needed to prevent flooding
sea levels are likely to increase due to climate change (eustatic change- caused by the melting of glaciers and thermal expansion)