bureau of economic geology the university of texas at austin
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Long-term Average Annual Rate of Shoreline ChangeTRANSCRIPT
Bureau of Economic GeologyThe University of Texas at Austin
GEOTUBES ALONG THE UPPER COAST
Preliminary Observations
James Gibeaut
Coastal Coordination CouncilExecutive Committee Special Meeting
November 12, 2001
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
Geotube Schematic
Approx. 30 ft
Approx.7 ft
Installation Covered and vegetated
Exposed Maintenance
Treasure IslandJuly 19, 2001
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
2001July
1997Nov
1998Pre-Frances
1998Post-Frances
2000May
LIDAR Topographic ImagesGilchrist East Geotube Area
Rollover Pass Gulf of Mexico
1,000 ft
Pirates Beach on Galveston IslandJune 14, 2001
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
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
GLO-021 Profile Location
Sept. 23, 1999
June 13, 2001
GLO-21 Profile Location
July 18, 2001
Website
www.beg.utexas.edu/coastal/coastal01.htm