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Human Impact on Beaches

Human Impact on Beaches. Erosion and the Outer Banks. Read the a rticle on Outer Banks beach erosion As you read, highlight words or things that you do not know. Once you finish reading, write a summary of the article. Longshore Drift.

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Human Impact on Beaches

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  1. Human Impact on Beaches

  2. Erosion and the Outer Banks • Read the article on Outer Banks beach erosion • As you read, highlight words or things that you do not know. • Once you finish reading, write a summary of the article.

  3. LongshoreDrift • When swimming in the ocean, have you ever wondered why you tend to be carried down the beach, away from your towel in an undertow? • The transportation of sediments along a coast at an angle to the shoreline

  4. Preventing Beach Erosion • Sea Wall – a structure to protect a coast from erosion • Built parallel to the shore • Designed to shield the coast and defend property from the force of breaking waves

  5. Causes the sediments in front of the wall to be swept in the ocean. • Further loss of beach prompts people to build a bigger, “better” wall to stop the erosion caused by the original seawall.

  6. Preventing Beach Erosion • Breakwater - sediment movement is blocked from continuing along the coastline, disrupting the longshore transport. • Built parallel to the shore line • Protects boats from the force of large breaking waves by creating a quiet water zone near the shore

  7. Preventing Beach Erosion Groin - designed to trap sediments in an area of the beach. • disrupt the longshore transport • Perpendicular to the shore • the beach on the other side of the groin will continue to loose sediments

  8. Preventing Beach Erosion

  9. Preventing Beach Erosion • Beach Nourishment – sediment lost through long shore drift or erosion is replaced • Beach nourishment video • http://outerbanksvoice.com/2011/07/14/see-24-hours-of-beach-nourishment-in-2-minutes/

  10. Preventing Beach Erosion • Vegetation – helps hold sand in place

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