Flashcards in Coastal Landscapes in the UK - key words Deck (32):
Air is smashed into the cracks b the power of the water. Cracks expand and rocks weaken and eventually break.
Rocks hit the bottom of a cliff and break it causing the clif to collapse and a wave cut platform is formed.
Attrition is when rocks constantly hit against eachother they break eachother down. Rocks can also make rocks smaller, rounder and smoother.
Sea water is very corrosive and can slowly dissolve chalk and limestone, which makes the size of cracks/joints bigger so that more erosion can take place.
Wetting and Drying
Softer rocks such as clay can get bigger (expand) when they are wet and then get smaller (contract) when they dry out. This can make the rock weaker so they erode more easily.
There are three examples of this:
3. Hydraulic action
These types of waves create beaches.
These types of waves destroy beaches.
This is when material in the wave is washed up the beach.
This is when material in the wave is washed back down the beach.
This is when material is transported in the wave.
This is when material is deposited (dropped) by the wave.
These have alternating layers of rock at right angles to the coast.
These have alternating layers of rock that are parallel to the coast.
The number of waves breaking per minute.
The top of a wave.
The vertical distance from trough to crest.
The base of a wave.
The horizontal distance between two successive crests.
Hold the line
Maintain the existing coastal defences.
Advance the line
Build new defences further out to sea than the existing ones.
Build no coastal defences at all and deal with the consequences as it happens.
Retreat the line
Build no coastal defences, but move people away from the coast.
Man - made structures built to control the flow of the sea and reduce flooding and erosion.
Schemes set up using knowledge of the sea and its processes to reduce the effects of flooding and erosion.
A wall made out of hard material like concrete that reflects waves back to sea.
Wooden or stone fences that are bulit at right angles to the coast. They trap material transported by longshore drift.
Sand and shingle from elsewhere that's added to beaches.
Rip - rap
Boulders that are piled up along the coast.
Slanted structures made of concrete, wood or rocks built at the foot of a cliff.
Concrete blocks or boulders deposited on the sea bed off the coast.