COASTAL PROCESSES 1 ADDITIONAL SLIDE PRESENATION OLD DOMINION - - PDF document

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COASTAL PROCESSES 1 ADDITIONAL SLIDE PRESENATION OLD DOMINION - - PDF document

Oct 18, 2023 599 likes •788 views

The University of the West Indies Organization of American States P ROFESSIONAL D EVELOPMENT P ROGRAMME : C OASTAL I NFRASTRUCTURE D ESIGN , C ONSTRUCTION AND M AINTENANCE A COURSE IN COASTAL

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The University of the West Indies Organization of American States

PROFESSIONAL DEVELOPMENT PROGRAMME: COASTAL INFRASTRUCTURE DESIGN, CONSTRUCTION AND MAINTENANCE

A COURSE IN COASTAL ZONE/ISLAND SYSTEMS MANAGEMENT

CHAPTER 3

COASTAL PROCESSES 1

ADDITIONAL SLIDE PRESENATION OLD DOMINION UNIVERSITY

NORFOLK, VIRGINIA, USA

COASTAL HYDRAULIC LABORATORY US ARMY CORPS OF ENGINEERS, VICKSBURG, MA, USA

Organized by Department of Civil Engineering, The University of the West Indies, in conjunction with Old Dominion University, Norfolk, VA, USA and Coastal Engineering Research Centre, US Army, Corps of Engineers, Vicksburg, MS , USA.

Antigua, West Indies, June 18-22, 2001

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A RIVER OF SAND A RIVER OF SAND

Video (20 minutes) by Professor Douglas Inman, Ph.D. Scripps Institute of Oceanography and, John S. Shelton, Ph.D. American Geological Institute

available from Encyclopedia Britannica Educational Corp. Chicago, Illinois 1967

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US Army Corps

  • f Engineers

THE BEACH: A RIVER OF SAND (video) Summary THE BEACH: A RIVER OF SAND (video) Summary

  • Sand for beaches comes from upstream

mountains

  • Beaches are formed by the seasonal variation
  • f w aves
  • Waves breaking at angle cause sand transport

along the beach, like a river of sand

  • Man’s structures (harbors, breakw aters, upland

dams, etc.) interrupt the sand movement

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US Army Corps

  • f Engineers

THE BEACH: A RIVER OF SAND (video) Summary THE BEACH: A RIVER OF SAND (video) Summary

  • Conclusion

“Whenever man interferes with such a system, he becomes involved in its operation. To the degree that man upsets the natural balance of the system, he and his machines must do the work that nature did before.”

Inman and Shepard, 1967

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E q u i l i b r i u m , M H W

Waves Y , st able Reference Baseline

Dune, cliff, man's art ifact s and veget at ion

(c) P

  • cket beach

Rocky headland Rocky headland Narrow rocky shorelines

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US Army Corps

  • f Engineers

THE BEACH: A RESERVOIR OF SAND THE BEACH: A RESERVOIR OF SAND

  • Naturally, stable shorelines include rocky

headland/bay beaches and pocket beaches.

  • The minimum dry beach w idth, Y min (or

volume) depends on storm w ave energy.

  • Beaches are shaped by the seasonal variation
  • f w aves.
  • Storm w aves drag sand offshore to build bars.
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US Army Corps

  • f Engineers

THE BEACH: A RESERVOIR OF SAND THE BEACH: A RESERVOIR OF SAND

  • Normal w aves naturally rebuild beaches after

storm events.

  • The beach is a reservoir of sand to mitigate

coastal storm impacts.

  • Conclusion

The beach is INFRASTRUCTURE for coastal storm hazard mitigation and must be maintained if erosion, man’s interference or extreme hurricane events diminish the reservoir volume.

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