Bureau of Economic Geology The University of Texas at Austin.
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Transcript of Bureau of Economic Geology The University of Texas at Austin.
![Page 1: Bureau of Economic Geology The University of Texas at Austin.](https://reader036.fdocuments.in/reader036/viewer/2022062504/5a4d1b517f8b9ab0599a7e2d/html5/thumbnails/1.jpg)
Bureau of Economic GeologyThe University of Texas at Austin
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GEOTUBES ALONG THE UPPER COAST
Preliminary Observations
James Gibeaut
Coastal Coordination CouncilExecutive Committee Special Meeting
November 12, 2001
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0 20 40 60 80 100 120 140 160 180kilometers alongshore
-10
0
10
-5
5
re
trea
t
m
/yr
adv
ance
Freeportjetties
Brazos River
San LuisPass end of
seawall
GalvestonSeawall
East Beach
West Beach
BolivarRoads
Rollover PassHigh
Island
Follets Island Galveston Island Bolivar Peninsula
Sabine Pass
Long-term Average Annual Rate of Shoreline Change
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Geotube Schematic
Approx. 30 ft
Approx.7 ft
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Installation Covered and vegetated
Exposed Maintenance
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Treasure IslandJuly 19, 2001
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Geotube LocationsJuly 2001
Rollover Pass
San Luis Pass
Gilchrist East 6,200 feet
Gilchrist East
Total = 6.32 miles
Gilchrist West
Gilchrist West 14,400
Dellanera
Dellanera 1,590
Pocket Park 2
Pocket Park 2 380
Riviera
Riviera 590
Pirates Beach
Pirates Beach 8,540
Treasure Island, North, Middle, South
Treasure Island 1,650
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2001July
1997Nov
1998Pre-Frances
1998Post-Frances
2000May
LIDAR Topographic ImagesGilchrist East Geotube Area
Rollover Pass Gulf of Mexico
1,000 ft
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Pirates Beach on Galveston IslandJune 14, 2001
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Exposed Geotubes June 13, 2001
Project Exposed (ft) % Exposed
Gilchrist, East 1,670 27
Gilchrist, West 10,630 74
Dellanera 413 26
Pocket Park 2 0 0
Riviera 0 0
Pirates Beach 850 10
Treasure Isl. 960 58
Total 14,520 43
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Beach ProfileGilchrist West (GLO-021)
-1
0
1
2
3
4
5
0 20 40 60 80 100 120
9/23/1999
6/13/2001
7/18/2001
Heightin
meters
Distance in meters
geotube
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GLO-021 Profile Location
Sept. 23, 1999
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June 13, 2001
GLO-21 Profile Location
July 18, 2001
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Website
www.beg.utexas.edu/coastal/coastal01.htm