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CLASSIFYING COASTS - Coggle Diagram
CLASSIFYING COASTS
SEDIMENT CELL
SEDMENT CELL
Coasts can be split into sections called sediment cells. These are typically considered a
closed-system in terms of sediment. There are eleven sediment cells in England and Wales.
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DYNAMIC EQILIBRUIM opperates as one under moral conditions. in a sediment cell the dynamic eqilibrim is where inputs and outputs of sediment are in a constant state of change but remains balanced phyical and human action can change this eqilibrium
SYSTEM
not fully closed systems, so it is important to remember that actions within one
cell may affect another.
OPEN SYSTEM
OPEN SYSTEM
The coast can be considered as an open system as it receives inputs from outside the system and
transfers outputs away from the coast and into other systems
SYSTEMS
terrestrial, atmospheric or oceanic and can include the rock, water and carbon cycle
CLOSED SYSTEM
consider the coast as a closed system
in some circumstances such as during scientific research and coastline management planning.
FEED BACK LOOP
FEED BACK LOOPS The coastal system has mechanisms which enhance changes within a system, taking it away from dynamic equilibrium (positive feedback) or mechanisms which balances changes, taking the system back towards equilibrium (negative feedback).
NEGATIVE FEEDBACK-
this lessens any change which has occured within the system. For example, a storm could erode a large amount of a beach, taking the beach out of dynamice quilibrium as there is a larger input of sediment into the system than output
balance this excess of inputted sediment
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- The bar dissipates the waves energy which protects the beach from further erosion.
- Over time the bar gets eroded instead of the beach.
- Once the bar has gone normal conditions ensue and the system goes back to dynamic
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POSITIVE FEEDBACK LOOP - exagerate the change making the system more unstable and taking it away froim the dynamic equilibruim
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- As the roots from the vegetation have been holding the sand dunes together, damaging the
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- Eventually the sand dunes will be completely eroded leaving more of the beach open to
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LITTORAL ZONE
LITORAL ZONE =area of coast where land is subject to wave action contantly changing
Short-term factors like tides and storm surges.
- Long-term factors like changes in sea level and climate change
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