Coastal landscapes
- Created by: Superdylan870
- Created on: 25-03-18 18:17
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- Coastal Landscapes
- Waves and their characteristics
- Constructive - Breaking waves push debris up, Low waves with crest far apart, gentle sloping wave front, formed by storms hundreds of km away, Strong swash, little backwash
- Destructive- Waves close together, Waves become high with steep wave front, Breaking waves plunge onto beach, Little swash, Strong backwash.
- Constructive - Breaking waves push debris up, Low waves with crest far apart, gentle sloping wave front, formed by storms hundreds of km away, Strong swash, little backwash
- Weathering types
- Mechanical, Disintegration of rock, example - Freeze-Thaw
- Chemical, Caused by chemical changes- example is acid rain
- Biological - Caused by flora and fauna (Animals and plants)- example is rabbits burrowing into soil
- Chemical, Caused by chemical changes- example is acid rain
- Mechanical, Disintegration of rock, example - Freeze-Thaw
- Mass movement
- Rockfall - rock breaks away due to freeze-thaw
- Landslide- Blocks of rock slide downhill
- Mudflow- saturated soil and weak rock flows downhill
- Rotational slip - Slump of saturated soil and weak rock on a curved surface
- Mudflow- saturated soil and weak rock flows downhill
- Landslide- Blocks of rock slide downhill
- Rockfall - rock breaks away due to freeze-thaw
- Coastal erosion
- Erosion is wearing away of landscape
- Solution- Dissolving of soluble chemicals in rock
- Corrasion - Rock fragments thrown at cliff and that scrapes rock
- Abrasion- Pebbles grinding on rocky platform
- Hydraulic action- Power of waves hitting a cliff, air is forced into rocks to break it up.
- Abrasion- Pebbles grinding on rocky platform
- Corrasion - Rock fragments thrown at cliff and that scrapes rock
- Solution- Dissolving of soluble chemicals in rock
- Erosion is wearing away of landscape
- Transportation
- Solution- Dissolved chemicles
- Suspension- particles carried in the water
- Traction- large pebbles rolling along the seabed
- Saltation, hopping motion of particles too heavy for suspension
- Longshore drift- movement of sediment, depends on prevailing wind.
- Saltation, hopping motion of particles too heavy for suspension
- Traction- large pebbles rolling along the seabed
- Suspension- particles carried in the water
- Deposition happens when waves lose energy, creating beaches, mudflats and saltmarshes
- Solution- Dissolved chemicles
- Coastal landforms at Swanage
- Swanage- South coast of enland
- Poole harbour- 2 spits have formed at mouth
- Studland bay- lagoons, saltmarshes, sand dunes and beaches
- Swanage bay- Sheltered with a broad sandy beach
- Discordant coastline forms where there are bands of harder and softer rock
- Swanage bay- Sheltered with a broad sandy beach
- Studland bay- lagoons, saltmarshes, sand dunes and beaches
- Poole harbour- 2 spits have formed at mouth
- Swanage- South coast of enland
- Hard engineering
- Sea walls- rock barrier, curved to reflect waves,effective but unnatural and expensive
- Groynes- Rock or timber structures to create a wider beach, not too expensive but can interupt longshore drift
- Rock armour- piles of large boulders to absorb energy. cheap but obtrusive and rocks do not fit in
- Gabions- rock filled wire cages, cheap but cages rust.
- Rock armour- piles of large boulders to absorb energy. cheap but obtrusive and rocks do not fit in
- Groynes- Rock or timber structures to create a wider beach, not too expensive but can interupt longshore drift
- Sea walls- rock barrier, curved to reflect waves,effective but unnatural and expensive
- Soft engineering
- Beach nourishment- sand is transported to coast and dumped, cheap, blends in but needs maintainance
- Dune regeneration- stabilise dunes, cheap but can me damaged and is time consuming
- Dune fencing- Fences are constructed to encourage new dune formations, little impact naturally but needs maintainance
- Dune regeneration- stabilise dunes, cheap but can me damaged and is time consuming
- Beach nourishment- sand is transported to coast and dumped, cheap, blends in but needs maintainance
- Lyme Regis
- Small costal town in Dorset
- Issues- Unstable cliffs, Rapid erosion, damaged properties, Sea walls are being breached.
- New sea walls and promenades, stabilising cliffs, creation of wide sand and shingle beach, extension of rock armour
- Cost: Over 43 million pounds.
- Quite successful
- Cost: Over 43 million pounds.
- New sea walls and promenades, stabilising cliffs, creation of wide sand and shingle beach, extension of rock armour
- Issues- Unstable cliffs, Rapid erosion, damaged properties, Sea walls are being breached.
- Small costal town in Dorset
- Waves and their characteristics
- Made by Dylan Madden
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