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GEOTUBES ALONG THE UPPER COAST

Bureau of Economic Geology John A. and Katherine G. Jackson School of Geosciences The University of Texas at Austin. GEOTUBES ALONG THE UPPER COAST. James Gibeaut Tiffany Hepner, Rachel Waldinger, John Andrews. Initial Analysis. Coastal Coordination Council

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GEOTUBES ALONG THE UPPER COAST

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  1. Bureau of Economic GeologyJohn A. and Katherine G. Jackson School of GeosciencesThe University of Texas at Austin

  2. GEOTUBES ALONG THE UPPER COAST James Gibeaut Tiffany Hepner, Rachel Waldinger, John Andrews Initial Analysis Coastal Coordination Council Executive Committee Special Meeting January 29, 2002 A report of the Texas Coastal Coordination Council pursuant to National Oceanic and Atmospheric Administration award number NA97OZ0179

  3. Approx. 7 ft Approx. 30 ft Geotube Schematic

  4. Installation Covered and vegetated Exposed Maintenance

  5. Treasure IslandJuly 19, 2001(section destroyed in November 2001) Gibeaut_CCC_Jan31_2002 QAd496

  6. Long-term Average Annual Rate of Shoreline Change Gibeaut_CCC_Jan31_2002 QAd496

  7. The Problems Problem 1: Long-term shoreline retreat has placed many structures in danger of failing during the next storm or being gradually undermined as retreat continues in the absence of adequate beach nourishment. Problem 2: In the absence of adequate beach nourishment, geotubes may form an unacceptable landward boundary or barrier to the public beach because of shoreline retreat. They may also cause adjacent shorelines to retreat at a higher rate. Gibeaut_CCC_Jan31_2002 QAd496

  8. Geotube Monitoring Goals • Determine how geotubes affect the beach/dune system • How they serve as • storm protection structures • erosion control structures • How they affect the • beach/dune system where they are located • beach/dune system adjacent to them • Provide data for designing future erosion mitigation projects Gibeaut_CCC_Jan31_2002 QAd496

  9. Field Methods • 3 ground surveys per year • Beach profiles (topographic transects) • Shoreline survey • Geotube visual inspection: damage, sand cover, vegetation cover • 1 airborne topographic lidar survey per year • Wave and water-level analysis Gibeaut_CCC_Jan31_2002 QAd496

  10. Rollover Pass Gilchrist East Gilchrist West Dellanera Pocket Park 2 Riviera San Luis Pass Pirates Beach Treasure Island, North, Middle, South Gilchrist East 11,300 feet Gilchrist West 14,400 Dellanera 1,590 Pocket Park 2 380 Riviera 590 Pirates Beach 8,540 Treasure Island 1,650 Geotube LocationsNovember 2001 Total = 7.28 miles Gibeaut_CCC_Jan31_2002 QAd496

  11. Lidar Topographic Images Gilchrist East Geotube Area 1997 Nov 1998 Pre- Frances 1998 Post- Frances 2000 May 2001 July 1,000 ft Gulf of Mexico Rollover Pass Gibeaut_CCC_Jan31_2002 QAd496

  12. Beach ProfileGilchristWest (GLO-021) Gibeaut_CCC_Jan31_2002 QAd496

  13. GLO-021 Profile LocationGilchrist West Sept. 23, 1999 Gibeaut_CCC_Jan31_2002 QAd496

  14. June 13, 2001 July 18, 2001 November 14, 2001 GLO-21 Profile LocationGilchrist West Geotube Gibeaut_CCC_Jan31_2002 QAd496

  15. GLO-021 Profile LocationGilchrist West Sept. 23, 1999 Gibeaut_CCC_Jan31_2002 QAd496

  16. Gilchrist East GeotubeNovember 15, 2001(example of “fully” exposed face) Gibeaut_CCC_Jan31_2002 QAd496

  17. Exposed Geotubes Gibeaut_CCC_Jan31_2002 Gibeaut_CCC_Jan31_2002 QAd496 QAd496

  18. Gilchrist East GeotubeNovember 14, 2001(typical - some sections less vegetation) Gibeaut_CCC_Jan31_2002 QAd496

  19. Exposed Geotubes Gibeaut_CCC_Jan31_2002 QAd496

  20. Gilchrist West GeotubeNovember 15, 2001(fully exposed face) Gibeaut_CCC_Jan31_2002 QAd496

  21. Gilchrist West GeotubeNovember 15, 2001(one of several small holes) Gibeaut_CCC_Jan31_2002 QAd496

  22. Gilchrist West GeotubeNovember 15, 2001(covered but steep and little vegetation) Gibeaut_CCC_Jan31_2002 QAd496

  23. Exposed Geotubes Gibeaut_CCC_Jan31_2002 QAd496

  24. Pirates Beach on Galveston Island November 15, 2001 (only exposed section) Gibeaut_CCC_Jan31_2002 QAd496

  25. Pirates Beach on Galveston IslandNovember 15, 2001(covered and vegetated, typical for project) Gibeaut_CCC_Jan31_2002 QAd496

  26. BEG-02 Beach profile Landward boundary Geotube MHHW +0.6 m msl Comparing Beach Widths(SW End Pirates Beach) Gibeaut_CCC_Jan31_2002 QAd496

  27. Beach Profile (BEG-02)SW of Pirates Beach Geotube Gibeaut_CCC_Jan31_2002 QAd496

  28. Beach Profile (BEG-02)SW of Pirates Beach GeotubeJune 14, 2001 Gibeaut_CCC_Jan31_2002 QAd496

  29. Beach Profile (BEG-02)SW of Pirates Beach GeotubeJuly 19, 2001 Gibeaut_CCC_Jan31_2002 QAd496

  30. Beach Profile (BEG-02)SW of Pirates Beach GeotubeNovember 13, 2001 Gibeaut_CCC_Jan31_2002 QAd496

  31. Beach Profile (GAL-02)Near SW end of Pirates Beach Geotube Gibeaut_CCC_Jan31_2002 QAd496

  32. Beach Profile (GAL-02)Near SW end of Pirates Beach GeotubeNovember 13, 2001 Gibeaut_CCC_Jan31_2002 QAd496

  33. Beach Profile (GAL-02)Near SW end of Pirates Beach GeotubeJuly 19, 2001 Gibeaut_CCC_Jan31_2002 QAd496

  34. BEG-02 Beach profile Landward boundary Geotube MHHW +0.6 m msl Comparing Beach Widths(SW End Pirates Beach) Gibeaut_CCC_Jan31_2002 QAd496

  35. Beach Width at Pirates Beach Gibeaut_CCC_Jan31_2002 QAd496

  36. Water Level and Waves Combined(data from Pleasure Pier tide gauge) TS Frances TS Josephine TS Allison Gibeaut_CCC_Jan31_2002 QAd496

  37. Conclusions as of 2001 • Improvement in keeping geotubes coveredbut keeping covered is significant effort • Beach width is generally narrower in front of the geotubes • Adjacent shoreline not affected • Storm-protection function not yet tested Gibeaut_CCC_Jan31_2002 QAd496

  38. Website www.beg.utexas.edu/coastal/coastal01.htm Gibeaut_CCC_Jan31_2002 QAd496

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