Coastal processes_3

Coastal processes_3 - Stabilization of the coastal zone...

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Other engineering structures Groins Breakwater Attached breakwater Jetties
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Detached Breakwater at Santa Monica Pier Longshore drift Before After
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Longshore drift Attached Breakwater at Santa Barbara, CA
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Longshore drift Jetties at Santa Cruz, CA
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Beach Nourishment Miami Beach Before After
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Beach Nourishment Miami Beach 1977-1980 $62M – Successful Ocean City (NJ) 1982 $5M – Lost in 3 months Miami Beach
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Barrier Islands Assateague Island
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Barrier Islands along Eastern seaboard (Gulf Coast, too)
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Natural state: Low relief (storm surge washes over) Landward retreat (0-20 m/year) Westhampton Beach
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Washover on Galveston Island
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Ocean City, MD Beach drift
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Delaware coast Shinnecock Inlet
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Impact of development on barrier islands Increasing the height of dunes focuses erosion on the beach in front of them
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Five Principles to Guide Coastal Development and Usage Coastal erosion is a natural process; erosion problems occur when people build in the coastal zone. Any shoreline construction causes change.
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Unformatted text preview: Stabilization of the coastal zone protects relatively few people at the greater expense of the general public. Engineering structures designed to protect a beach may eventually destroy it. Once started, shoreline engineering structures produce a trend in development that makes it difficult (or impossible) to reverse. The cost of saving the beach property is, in the long run, greater than the value of the property to be saved. Proposed Long Beach Restoration Project (2005) Rebuild 18 existing groins Construction of 7 new groins Beach nourishment Increase dune height locally Estimated Cost: $93 M ($60 M Federal and $33 M state and local) City of Long Beach voted not to approve project. Proposed Restoration of Other L.I. Beaches E-zones Already required in some states Zoning requirements Setbacks from waters edge based on historical rates of erosion...
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This note was uploaded on 05/13/2011 for the course GEO 101 taught by Professor Hanson during the Spring '08 term at SUNY Stony Brook.

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Coastal processes_3 - Stabilization of the coastal zone...

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