Coastal Studies, Bureau of Economic Geology

Texas Coastal Hazards Atlas Database Structure - Volume 1.

1. Cities

3. DOQQs All mosaics are scale dependent (<1:100,000)

Bolivar	Robinson Lake	Jones Creek
Caplen East	Star Lake	San Luis Pass
Caplen West	Clam Lake	Surfside
Flake	Sabine Pass	Virginia Point
High Island	North Galveston	West Bay
Mud Lake	South Galveston	Christmas Bay
Oyster Bayou	Hoskins Mound	North Christmas Bay
	Jamaica Beach	Christmas Point

For more information on DOQQs visit http://www.tnris.state.tx.us/DigitalData/doqs.htm.

4. Environmental Sensitivity Index (ESI) Shoreline

This is the Environmental Sensitivity Index Shoreline characterization of the Upper Texas Coast.

5. Shoreline Change

Erosion rate in the ArcIMS map is also scale dependent (<1:72,000).

A. Gulf of Mexico

B. Bay Erosion

6. Hurricane Surge and Flooding

Layers of this directory are scale dependent (>1:1,640,524)

This directory contains hurricane related information derived from two separate sources. The computer surge data are calculated through computer modeling and depict the worst case scenario for various force level hurricanes. The flood data were mapped in the Natural Hazards of the Texas Coastal Zone (1974) and depict the landward extent of salt water flooding and areas of potential fresh water flooding as a result of hurricanes Beulah and Carla.

A. Computer Model Surge Data (Data explanation)

1. Maximum Surge Lines

Level 1-5: max1, max2, max3, max4, max5

2. Net Inundation Area

Level 2-5: netall

B. Hurricanes Beulah and Carla Flood Areas

7. National Wetland Inventory (nwi)

NWI data are by county and are scale dependent (<1:78,471). NWI map codes legend

NWI data were downloaded from the U.S. Fish and Wildlife Service's NWI site at www.nwi.fws.gov in January, 1999.

Brazoria	Chambers	Galveston
Jefferson	Harris

8. Shorelines (Gulf of Mexico, Data explanation)

A. Historic Shorelines

B. Projected 2006, 2026, 1996, 2056 Shorelines

C. Net Projected Shoreline Erosion and Accretion 1996-2056

Abstract
Changes in shoreline position occurring for more than a century provide estimates of the relative stability of shorelines and, along the Texas coast, allow comparisons of shoreline changes before and after human modifications became significant. Despite the widespread use of shoreline protection measures, about 78 percent of the shorelines within the Galveston Bay system retreated between the early 1850's and 1982. During this period, bay shorelines moved an average of 2.2 ft/yr landward, causing the loss of about 12.5 square miles of land. (Above is taken from Paine and Morton, 1986.)

9. Washover Features

A. Washover Channels and Interdune Drainages (Polygons)

B. Washover Areas (Arcs)

10. Subsidence

Subsidence(1906-1987): Approximate land-surface subsidence 1906-1987

Subsidence(1983-1987): Approximate land-surface subsidence 1983-1987

Extensometer: Extensometer measurement sites

TIF Image Files of Extensometer Graphs

"addicks".gif: Image files of extensometer graphs (compaction versus year). Image may be hot-linked to data collection site in extensometer measurement site theme. View window must be resized to obtain optimum visibility. In the ArcIMS map, the images are already hot-linked to points in the Extensometer layer.

•addicks	•lkhouston	•southwest
•baytown	•northeast	•space
•clear	•pasadena	•texas
•eastend	•seabrook

11. Faulting

Faults are scale dependent (<1:673,725)

egat_faults - Environmental Geologic Atlas of Texas Faults

usgs_faults - USGS Faults

houston_faults - GPS surveyed locations of known faults mapped as part of an ongoing study at the BEG and Center for Space Research, UT.

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