Geography: EQ2 Flashcards
What is longshore drift?
Longshore drift is when the prevailing wind moves sediment up the beach at an angle and then it flows back down the beach at a 90 degree angle.
What is swash?
Swash is when waves go up the beach.
What is backwash?
Backwash is when waves go down the beach.
Why does swash take place?
Swash occurs because the wind blows it up the beach.
Why does backwash take place?
Backwash takes place because of gravity.
What are the characteristics of concordant coastlines?
Strata is parallel to the coastline, it has a resistant layer of limestone along the coast.
What is an example of a concordant coastline?
An example of a concordant coastline is Lulworth Cove in Dorset.
what are the features of a concordant coastline?
There are coves and the rocks are parallel to the coastline. Sometimes it can be featureless.
What are the characteristics of discordant coastlines?
The strata are at right angles to the coast, it has resistant sandstones and softer limestones and it has rock layers perpendicular to the coast.
What is an example of discordant coastlines?
South-West Ireland.
What are the features of discordant coastlines?
It contains headlands and bays, there are also stacks and stumps there.
When a spit is formed how does Long Shore Drift make it bigger?
Long Shore Drift makes a spit bigger because sediment is blow by the prevailing wind at an angle which adds to and extends the spit.
How does the spit get curved?
There is a secondary wind direction that blows the sediment in another direction which curves it.
What are salt-marshes?
Salt-marshes is mud behind a spit that gets developed in a calm part of the headland. Silt is deposited to form this. Here, plants that feed on salt can grow, the roots keep the salt marsh together.
What do groynes do?
Groynes stop long shore drift taking place which traps sediment which creates a beach.
