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Gordon G. Thomson, P.E., D.CE.

Gordon G. Thomson, P.E., D.CE. Director, Coastal Planning & Engineering, Inc. – A Shaw Group Company. Monitoring and Performance Evaluation of Emergency Berms April 25, 2012. Emergency Berm Monitoring and Performance. Reach locations and design Shell Island Pelican Island

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Gordon G. Thomson, P.E., D.CE.

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  1. Gordon G. Thomson, P.E., D.CE. Director, Coastal Planning & Engineering, Inc. – A Shaw Group Company Monitoring and Performance Evaluation of Emergency Berms April 25, 2012

  2. Emergency Berm Monitoring and Performance • Reach locations and design • Shell Island • Pelican Island • Scofield Island • Chandeleur Island • Volume Change Mechanisms • Summary • Sample Text Box Sample Photo Frame Emergency Berm Monitoring & Performance

  3. Project Location Map Emergency Berm Monitoring & Performance

  4. Emergency Berm Design • Crest elevation = +6 ft, NAVD • Crest width = 20 ft • Side slopes • 1V:25H above -2 ft, NAVD • 1V:50H below -2ft, NAVD Emergency Berm Monitoring & Performance

  5. Shell Island (W-8) • Start = Oct. 3, 2010 • End = Nov. 23, 2010 • As-built length = 8,400 ft • Pre-construction condition had no continuous shoreline • As-built volume = 780,000 cubic yards (cy) • 360-day volume = 640,000 cy • 82% of volume remains Emergency Berm Monitoring & Performance

  6. Shell Island (W-8) Emergency Berm Monitoring & Performance

  7. Pelican Island (W-9) • Start = July 18, 2010 • End = Oct. 2, 2010 • As-built Length = 12,400 ft • Advanced shoreline an average of 260 ft • As-built volume = 1,240,000 cy • 360-day volume = 980,000 cy • 79% of volume remaining Photo courtesy of Great Lakes Dredge & Dock Oct 4, 2011 Emergency Berm Monitoring & Performance

  8. Pelican Island (W-9) Emergency Berm Monitoring & Performance

  9. Scofield Island (W-10) • Start = Sept. 13, 2010 • End = Nov. 24, 2010 • As-built length = 14,000 ft • Advanced shoreline an average of 310 ft • As-built volume = 960,000 cy • 360-day volume = 880,000 cy • 92% of volume remaining Emergency Berm Monitoring & Performance

  10. Scofield Island (W-10) Emergency Berm Monitoring & Performance

  11. Chandeleur Island (E-4) • Start = June 20, 2010 • End = March 21, 2011 • As-built length = 48,000 ft • Advanced shoreline an average of 410 ft • As-built volume = 3,170,000 cy • 180-day volume = 3,490,000 cy Emergency Berm Monitoring & Performance

  12. Chandeleur Island (E-4) Emergency Berm Monitoring & Performance

  13. Volumetric Change Mechanisms • Frequency of the monitoring surveys allowed for differentiation between the various coastal processes • Settlement: Compaction of underlying soils • Overwash: Volume change landward of as-built crest (no net loss of sediment) • Longshore transport: Sediment movement along Gulf shoreline • Offshore loss: Loss of fine grained sediment in an offshore direction Emergency Berm Monitoring & Performance

  14. Profile Comparison: Pelican Island Emergency Berm Monitoring & Performance

  15. Summary Emergency Berm Monitoring & Performance

  16. Gordon Thomson Director, CPE – A Shaw Group Company gordon.thomson@shawgrp.com CONTACT

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