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Tracking Shoreline and Geomorphic-Unit Change on South Padre Island, Texas Using Chiroptera Mapping System. Tiffany L. Caudle, Thomas A. Tremblay, Jeffrey G. Paine, John R. Andrews, Kutalmis Saylam, and Aaron Averett Bureau of Economic Geology Jackson School of Geosciences

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  1. Tracking Shoreline and Geomorphic-Unit Change on South Padre Island, Texas Using Chiroptera Mapping System Tiffany L. Caudle, Thomas A. Tremblay, Jeffrey G. Paine, John R. Andrews, Kutalmis Saylam, and Aaron Averett Bureau of Economic Geology Jackson School of Geosciences The University of Texas at Austin American Shore and Beach Preservation Association National Coastal Conference October 2013

  2. Project • Acquire topographic and bathymetric lidar data and color infrared aerial imagery • Tasks: • Map 2013 shoreline, vegetation line and dune crest • Update change rates of shoreline position • Map geomorphic units • Beach-dune system volume analysis • Sediment budget

  3. BEG’s Chiroptera Airborne Lidar System Laser System PRR, Topo: 400kHz PRR, Bathy: 36kHz 40 degree swath λ = 1µm, 0.5 µm Camera DigiCAM 50 MP 8176 x 6132 px RGB, Color IR

  4. BEG’s Chiroptera Airborne Lidar System Red laser Green laser 50 MP Camera (RGB), CIR) Flight Direction Cessna 206

  5. South Padre Island Survey • Flown February 2013 (2 days) • Beach, dune, and nearshore environments along 79 km of shoreline (to 1 km offshore) • Topographic (200kHz) and bathymetric (36kHz)lidar data and hi-res Color I/R imagery • 8-10 points per sq m

  6. Topo data and CIR images 500-m swath landward of the shoreline • Bathy data collected 1000 m seaward of shoreline • Intent to establish depth-penetration and water-clarity limits in Gulf of Mexico

  7. Topographic Lidar Point Cloud Elevation Intensity

  8. Shoreline change

  9. 2010-2013 Lidar Shoreline Positions

  10. Short-term Shoreline Change Rates 2010-2013 1348 Sites Max Erosion: -9.03 m/yr Max Accretion: 17.47 m/yr Average Rate: 1.75 m/yr 36% of sites eroding (483) 64% of sites accreting (865)

  11. Decade-scale Shoreline Change Rates 2000-2013 1346 Sites Max Erosion: -6.11 m/yr Max Accretion: 2.67 m/yr Average Rate: -1.12 m/yr 76% of sites eroding (1024) 24% of sites accreting (322)

  12. Long-term Shoreline Change Rates 1937-2013 1350 Sites Max Erosion: -7.12 m/yr Max Accretion: 4.48 m/yr Average Rate: -2.15 m/yr 84% of sites eroding (1134) 16% of sites accreting (216)

  13. 1937-2013 2000-2013 2010-2013

  14. Geomorphic Unit Mapping

  15. Geoenvironments of South Padre Island

  16. Geoenvironments Mapping Methods

  17. Geoenvironments Washover Mapping

  18. Summary • Topographic and bathymetric lidar survey of SPI flown in early February 2013 • Comparison of 2013 lidar derived shoreline position with positions extracted from 2010-2012 data to determine short-term rates of shoreline change (ave. 1.75 m/yr accretion for SPI) • Calculate decade-scale (-1.12 m/yr) and long-term (-2.15 m/yr) rates of shoreline change • Lidar DEM beneficial for geoenvironments mapping • Continue analysis of bathymetric lidar data to establish depth-penetration and water-clarity limits in Gulf of Mexico

  19. Preliminary bathymetric results

  20. water surface 0.8 m 2.2 m 2 m 1.4 m bottom ground truth

  21. water surface 3.3 m 2.77 m 3.5 m bottom ground truth

  22. m m

  23. Thank you! Tiffany L. Caudle tiffany.caudle@beg.utexas.edu Bureau of Economic Geology John A. and Katherine Jackson School of Geosciences The University of Texas at Austin

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