Barrier Islands

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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

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Barrier Island Systems

• Common along Passive Margins
• lt100m to kms in width
• Sand is most common material
• Gravel common in glacial terranes

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Cape Hatteras
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Long-shore current moves down beach as a result
of waves coming into beach at an angle
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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

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Barrier Types

• Barrier Spits

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Recurved Spit
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Tombolo
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