3.1.1 Coasts As A System

Question 1

Are coasts an open system or a closed system?

Answer 1

The coast can be seen as both an open system and a closed system
It is an open system because it receives inputs from the lithosphere, atmosphere, hydrosphere, biosphere and cryosphere
However, during research and coastline management the coast can be seen as a closed system where a specific sediment cell is examined

Question 2

Outline an example of positive feedback loop at the coast (erosion)

Answer 2

As waves erode the cliff, material is released
This material abrades the cliff which results in even more cliff erosion

Question 3

Outline an example of a negative feedback loop at the coast (wave cut platform)

Answer 3

As the shore is eroded, material makes the wave cut platform wider
This can absorb wave energy and reduce the impact at the base of the cliff