Coastal Recession

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  • coastal retreat
    • dredging
      • removal of sediment for use in construction - linked to increased rates of coastal retreat
        • dredging in California has had long term implications on the supply of sediment to the Santa Barbara littoral cell
      • removal of sediment causes depth of ocean to increase
      • increase in destructive waves at the coast bc they maintain energy further towards the shoreline
    • subaerial processes
      • weathering and mass movement can increase rate of recession
      • long periods of rainfall weaken rock structure and leads to mass movement
        • eroded and transported away by wave actions
    • wind direction
      • controls the movement of waves
      • dominant waves means destructive waves to attack the coastline
      • waves travel a long distance which is linked to the fetch of a wave
    • tides
      • gravitational pull - when the pull is at is strongest there are high tides
        • high tides, increased rate of coastal recession increase as waves go further
    • seasons
      • winter - recession is greater than summer season due to stormy weather, with high tides and long wave fetch
    • weather systems
      • influenced by areas of high pressure creating anticyclones and low pressure creating depressions
        • low pressure systems cause unsettled weather conditions

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