Coasts (Mock 1) Flashcards
What is dip?
- Tectonic feature
- Angle of inclination of rock strata
- Sedimentary rocks are deposited
- Tilted by tectonic forces
What is the case study for horizontal dip?
Glamorgan Heritage Coastline - Carboniferous Limestone
What angle is the strata on high angle seaward dips?
45°
What angle is the cliff face on a low angle seaward dip?
Over 90°
Where has experienced mass movement via rotational slumping
Christchurch Bay - Barton on Sea
Where has experienced mass movement due to rockfall?
The Jurassic Coastline - South Dorset in April 2020
Where has a discordant coastline
Bantry Bay, SW Ireland
What is the strata at Bantry Bay
RS: Devonian Old Red Sandstone
WS: Carboniferous Limestone
Where has a concordant coastline?
Lulworth Cove, South Dorset Coastline
What is the strata at Lulworth Cove?
RS: Portland Limestone
WS: Wealden Clay
What is the sediment cell in?
Dynamic equilibrium
Example of negative feedback loops
Wave cut notch -> blockfall -> natural rock armour -> blockfall less likely as cliff protected
Example of positive feedback loops
High winds remove plants from sand dunes -> no roots -> soil less stable and leaves don’t reduce wind -> Increased recession rates -> more sediment in the cell
Name a plant that grows in sand dunes?
Marram Grass
Name three policy options for coastal management
- Do nothing
- Managed realignment
- Hold the line
