Please enable JavaScript.
Coggle requires JavaScript to display documents.
Coasts - Coggle Diagram
Coasts
Erosion, Transportation, Movement and Weathering
-
-
Movement
-
Slumping - Downward alternating movement of rocks in areas with alternating permeable and impermeable rocks
-
Rockfall - Chunks of rocks fall off the cliff face, normally due to freeze-thaw
Weathering
Freeze thaw/ mechanical weathering - Rocks have water in them (due to being permeable or cracks) and overnight they freeze and expand. Cracks expand 10%
Chemical weathering - Rainwater and sea water has weak acid which slowly breaks down limestone and chalk overtime
Physical Weathering - Sun gets hot enough to slightly expand the rocks. They then contract in the dark. Constant movement deteriorates them
-
Waves
Concordant - Swash, deposits sediment
Destructive - Backwash, takes away sediment
-
Coastal Protection
Hard Engineering
Sea Walls - Absorb waves energy, prevents flooding, restricts access, £5000 a metre
Groynes - £5000 for one, ugly, prevents sediment, danger for surfers/swimmers
Gabions - £110 a metre, blend in, need to be well maintained
Rip Rap - £1000-£3000 per metre, quick and easy to set up, can used with others
Soft Engineering
-
Marram Grass Planting - Roots hold sand dune together, creates natural barrier and secures sandune
-
Landforms
Erosion
Headlands - Discordant wave hits a cliff and the softer rock is eroded and the hardrock stays where it was.
-
-
-
-
-
-
Deposition
-
-
Spit - Waves swashing against a beach at an angle. When they reach the end they deposit material there
-