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1.a - coastal landscapes can be viewed as systems - Coggle Diagram
1.a - coastal landscapes can be viewed as systems
Components of coastal landscapes
Inputs
Including kinetic energy from wind and waves, thermal energy from the heat of the sun and potential energy from the position of the material on slopes
Processes
Consists of stores, including beach and nearshore sediment accumulations; and flows, such as the movement of sediment along a beach by lsd
Outputs
Including marine and wind erosion from beaches and rock surfaces; evaporation
The flows of energy and material through coastal systems
When a systems outputs and inputs are equal, they reach a state of equilibrium
For example the rate that sediment is being added, the same amount is being removed
When this equilibrium is being disturbed, the system self regulates i order to restore equilibrium - this is known as dynamic equilibrium,
Positive feedback
Where a change causes a further effect that continues or accelerates the original change
Negative feedback
Acts to lessen the effect of the original change and ultimately reverse it
Sediment cells
A sediment cell is a stretch of coastline and its nearshore area within which the movement of sediment, sand and shingle is largely self contained
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Intro
A system is a set of interrelated objects comprising components and processes
The energy available to a coastal landscape system may be kinetic, potential or thermal
Explain how coastal landscapes can be views as systems
On a larger scale they are open systems - sediment cells are closed systems
Inputs of energy (kinetic, thermal and potential) as well as sediment from marine deposition, fluvial sources, weathering and mass movement
Processes (flows, transfers and throughputs) e.g longshore drift, weathering, erosion, mass movement
Stores e.g beach, nearshore sediment accumulations
Outputs
Marine and wind erosion, evaporation
Can exist in a state of dynamic equilibrium, or can be disturbed causing a dynamic equilibrium as the system responds to the distrubrance - negative feedback