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Coasts
Coasts
Coasts
Coasts
Coasts
Coasts
Coasts
Coasts
Coasts
Coasts
Coasts
Coasts
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Coasts

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Transcript

  • 1. Coasts (Chapter 12)
  • 2. Erosional Coasts – removal of coastal material Land attacks from: Stream erosion, wind, freezing/thawing of water in rock cracks, plant roots, glaciers, rain Sea attacks from: Storms, surf, digging of marine organisms Can evolve into Depositional Coasts over time Ex: Rocky Shores , i.e. Southern tips of South America & Africa -highly erosional
  • 3. Sea Stacks
  • 4. Depositional Coasts – addition of coastal material Our most familiar depositional coasts: Beaches! Most deposition happens as a result of Longshore Currents Other examples of depositional coasts: Barrier Islands, Coral Reefs, Wetlands
  • 5. Barrier Islands Narrow, exposed sandbars that run parallel to land Ex: Fire Island (our last field trip)
  • 6. Coral Reefs Result from biological activity Types: Fringing – fringe the margin of land Barrier (Ex: Great Barrier Reef) – separated from land by a lagoon Atoll (Ex. Midway Atoll) – a ring shaped island of coral with a lagoon in the center What type of Reef is shown in these photos?
  • 7. Birth of a Reef
  • 8. What type of reef is shown below?
  • 9. Which type of reef is shown in these photos?
  • 10. Wetlands – where are they in this photo? Hurricane Isabel breach, Hatteras Island, NC. Photo taken Sept. 21, 2003. Courtesy Duke University Program for the Study of Developed Shorelines.
  • 11. Credits/More Info. ocean.tamu.edu/~wormuth/ coast al%20processes.ppt http://oceanz.tamu.edu/~wormuth/coastal%20processes.ppt#256,1,CHAPTER 10 The Coast: Beaches and Shoreline Processes

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