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Coasts

Coasts. Coastal classification based on tectonic activity Active coast- close to tectonic plate boundary Passive coast- far from tectonic plate boundary. Shepard Coastal classification system Primary coast- formed by processes not directly related to the ocean River erosion or deposition

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Coasts

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  1. Coasts • Coastal classification • based on tectonic activity • Active coast- close to tectonic plate boundary • Passive coast- far from tectonic plate boundary

  2. Shepard Coastal classification system • Primary coast- formed by processes not directly related to the ocean • River erosion or deposition • Erosion from glaciers • Tectonic activity • Volcanic activity

  3. Shepard Coastal Classification system • Secondary coasts- formed directly by marine action • Wave erosion • Marine deposition • Marine organisms (reefs and mangrove forests)

  4. Combination coasts= combo of both primary and secondary

  5. Coastal dynamics • Longshore Drift- tendency for material to move along the coastline due to longshore current

  6. Coastal dynamics • Sections of a Beach • Dune- hill of sand toward back of beach • Backshore- region rarely touched by sea water • Foreshore- part that water sometimes covers • Offshore- extends below low tide mark

  7. Coastal dynamics • Coastal cell- coastal region that changes in shape but there is no net loss or gain in sand • Erosion- loss of sand • Accretion- gain in sand

  8. Coastal dynamics • Large scale sand features • Spit- length of accumulated sand attached to land at one end, pointing in the direction of the longshore drift

  9. Coastal dynamics • Large scale sand features • Tombolo- spit that extends between two islands

  10. Coastal dynamics • Large-scale sand features • Barrier island- large sediment deposits that form between the ocean and the shoreline

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