The Coastal System Flashcards
True or false? Coasts are a natural system
True
What are sediment stores on coasts?
Depositional landforms are stores of sediment.
What are the flows/transfers of sediments on coasts?
Processes such as erosion, weathering, transportation and deposition move sediment within a system
What are the energy inputs on coasts?
- wind
- waves
- tides
- currents
Coastal system aren’t normally in dynamic equilibrium. True or false?
False. They are normally in dynamic equilibrium.
What restores the balance in a system if a change in an output or input occurs?
Negative feedbacks
Give an example a negative feedback in a coastal system.
As a beach is eroded cliffs are exposed to wave attack. Sediment eroded from cliffs is then deposited and builds the beach up again.
Give an example of a positive feedback in a coastal system.
As a beach starts to form it slows waves down, causing more deposition, increasing beach size
What are positive feedbacks?
When a change in the system causes amplification of effects.
How is wind created?
By air moving from areas of high pressure to areas of low pressure.
Describe the pressure gradient and therefore wind strength in storms.
Very high making winds very strong
What is prevailing wind?
Wind that blows from the same direction
Prevailing wind generates higher energy waves than winds that change direction. True or false?
True.
How are waves formed?
Wind blowing over the sea’s surface causes friction between the wind and surface, creating a circular motion in the water
What are the higher and lower levels of a wave called ?
Wave crest and trough respectively.
How do you work out a wave’s wavelength?
The distance between two wave crests.