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The Coastal System (Background (Require energy + material (Thermal energy,…
The Coastal System
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Stores
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Beaches - sand, gravel + shingle
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System Feedback
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Dynamic equilibrium
When equilib. is disturbed, the system undergoes self-regulation and changes its form
e.g. mass movement means cliff loses material, but the material that piles at the base of the cliff helps protect it form marine processes
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Sediment Cells
Is a stretch of coastline and its associated nearshore area within. The movement of coarse material, sand + shingle is largely self-contained
Inputs
Offshore
Marine Deposition
When constructive waves, tides + currents transport + deposit sediment on the shore form offshore locations
Aeolian Processes
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Wind has less energy than water, so these mats. are normally fine sands
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Terrestrial
Rivers
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Esp. important for coasts with a sharp gradient where the river directly deposits its sed. at the coast
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Background
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At the boudnary of each cell is a sed. sink - boundaries are normally determined by topography + shape of the coastline
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Large physical features act ass natural barriers that prevent the transfer of mat. to adjacent cells e.g. Land's End
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Processes
Energy Sources
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Require kinetic, potential + thermal energy from wave-action + sub-aerial processes
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Inputs
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Material Inputs
Offshore sediment
Marine deposition - when constructive tides + waves transport + deposit sediments from offshore locations
Aeolian processes - when wind blows over sandbars, dunes + beaches
Terrestrial sediment
Rivers - large source, esp. for coasts with sharp gradients where the river directly deposits sed. at the coast
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