1.3 what are the processes of marine transport and deposition and what are the resultant landforms
- Created by: Maxine La Grange
- Created on: 01-06-13 13:36
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- 1.3 what are the processes of marine transport and deposition and what are the resultant landforms
- transport and deposition in the coastal zone
- Longshore drift
- progressively transports beach sediment along beach
- caused by oblique approach of waves and consequently swash
- followed by direct return of sea backwash
- illustration pg 21 g3
- concentration of tidal flow
- produces tidal currents
- important in transporting sediments
- produces tidal currents
- short term (day to day)
- irregular
- long term
- has preferred direction
- Longshore drift
- coastal sediment budget
- illustration pg 42
- landforms of coastal deposition
- offshore bars
- ridges of sand and or shingle developed offshore on a gently shelving coastline
- submerged at high tide
- lagoon lies between mainland and bar
- bay head beaches
- areas of sand or shingle beach occupying part of a bay bounded by projecting headlands
- Barafundle Bay in pembrokeshire
- barrier islands
- 10-15% of worlds coastlines made of of these
- particullarly common in low-mid lattitudes
- factors common
- gently sloping offshore gradient
- limited tidal range
- relatively high wave energy
- East Coast of USA
- deposits of silt and clay beneath the sand or shigle
- illustration pg 59
- barrier beach
- spits grow across small bays eventually closing them in with complete sand ridges
- slapton sands in devon
- tombolo
- spit joining an island to the mainland
- town of LLANDUDNO, nORTH wales
- built on a tombolo that links to the mainland with the great Orme, a former offshore island made of carboniferous limestone.
- Hurst Castle Spit, Hampshire
- spits
- banks of sand and shingle projecting from the shoreline into the sea
- need supply of sediment from longshore drift
- build them
- maintain them
- far end is hooked
- formed from either:
- wave refraction
- local wave approach from a different direction
- formed from either:
- features a number of recurves (hooks)
- spits
- spits
- banks of sand and shingle projecting from the shoreline into the sea
- need supply of sediment from longshore drift
- build them
- maintain them
- far end is hooked
- formed from either:
- wave refraction
- local wave approach from a different direction
- formed from either:
- cuspate forlands
- triangular shaped projection with apex pointing out to sea
- vary in scale
- Dungeness, Kent
- fairly small scale-30km along kent coast, 15km into english channel
- illustration pg56
- fairly small scale-30km along kent coast, 15km into english channel
- larger scale
- Cape Fear along Carolina coast, USA
- reach 150 km
- Cape Fear along Carolina coast, USA
- offshore bars
- Sea-Level rises and deposition
- sea level rises
- create coastlines of submergance
- eustatic rises in sea level
- associated with glacial retreats and give rise to inundation of low lying areas by by the sea
- estuaries are created
- low tide exposes mudflats and deposited material
- Mawddach estuary, mID WALES
- INDENTATION IN THE COASTLINE, OFTEN FUNNEL SHAPED,that are infilling with sediment
- illustration pg 69
- Kent estuary, Cumbria
- example of a depositional estuary
- illustration pg70
- sea level rises
- transport and deposition in the coastal zone
- Untitled
- Untitled
- landforms of coastal deposition
- offshore bars
- ridges of sand and or shingle developed offshore on a gently shelving coastline
- submerged at high tide
- lagoon lies between mainland and bar
- bay head beaches
- areas of sand or shingle beach occupying part of a bay bounded by projecting headlands
- Barafundle Bay in pembrokeshire
- barrier islands
- 10-15% of worlds coastlines made of of these
- particullarly common in low-mid lattitudes
- factors common
- gently sloping offshore gradient
- limited tidal range
- relatively high wave energy
- East Coast of USA
- deposits of silt and clay beneath the sand or shigle
- illustration pg 59
- barrier beach
- spits grow across small bays eventually closing them in with complete sand ridges
- slapton sands in devon
- tombolo
- spit joining an island to the mainland
- town of LLANDUDNO, nORTH wales
- built on a tombolo that links to the mainland with the great Orme, a former offshore island made of carboniferous limestone.
- Hurst Castle Spit, Hampshire
- features a number of recurves (hooks)
- cuspate forlands
- triangular shaped projection with apex pointing out to sea
- vary in scale
- Dungeness, Kent
- fairly small scale-30km along kent coast, 15km into english channel
- illustration pg56
- fairly small scale-30km along kent coast, 15km into english channel
- larger scale
- Cape Fear along Carolina coast, USA
- reach 150 km
- Cape Fear along Carolina coast, USA
- offshore bars
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