Barrier Islands - PowerPoint PPT Presentation

kasimir-bonner
barrier islands n.
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Barrier Islands

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  1. Barrier Islands

  2. Which of the following INCREASES as sediment becomes more mature? • Grain size • Angularity • Sorting • None of the above

  3. Which of the following is in the intertidal zone? • Swish zone • Swash zone • Infiltraton zone • Ripple zone

  4. What is the main sediment transport mechanism in the supratidal zone? • Wind • Waves

  5. Summer Profile • Winter Profile

  6. Barrier Island Systems • Common along Passive Margins • <100m to kms in width • Sand is most common material • Gravel common in glacial terranes

  7. Cape Hatteras

  8. Long-shore current: moves down beach as a result of waves coming into beach at an angle

  9. Barrier Environments • Beach • Dynamic part of barrier • Sediment moves in and out of beach with storms • Barrier Interior • Frontal dune ridge, secondary dunes • Landward Margin • Intertidal sand or mudflat • Overwash deposits

  10. Barrier Types • Barrier Spits

  11. Recurved Spit

  12. Tombolo