Department of Economic Geology The University of Texas at Austin

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´╗┐Department of Economic Geology The University of Texas at Austin

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GEOTUBES ALONG THE UPPER COAST James Gibeaut Preliminary Observations Coastal Coordination Council Executive Committee Special Meeting November 12, 2001

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Long-term Average Annual Rate of Shoreline Change

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Approx. 7 ft Approx. 30 ft Geotube Schematic

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Installation Covered and vegetated Exposed Maintenance

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Treasure Island July 19, 2001

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Rollover Pass Gilchrist East Gilchrist West Dellanera Pocket Park 2 Riviera San Luis Pass Pirates Beach Treasure Island, North, Middle, South Gilchrist East 6,200 feet Gilchrist West 14,400 Dellanera 1,590 Pocket Park 2 380 Riviera 590 Pirates Beach 8,540 Treasure Island 1,650 Geotube Locations July 2001 Total = 6.32 miles

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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

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Pirates Beach on Galveston Island June 14, 2001

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Exposed Geotubes June 13, 2001

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Beach Profile Gilchrist West (GLO-021) Height in meters geotube Distance in meters

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GLO-021 Profile Location Sept. 23, 1999

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June 13, 2001 July 18, 2001 GLO-21 Profile Location

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Website www.beg.utexas.edu/seaside/coastal01.htm

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