See more from this Division: Gulf Coast Association of Geological Societies
See more from this Session: Environmental Geology I and Hydrology
Abstract:
The 2007 study was regional in scope and lacked closely spaced well control at aquifer outcrop boundaries. Additional wells with geophysical logs starting shallower than 300 ft below ground level were added to more tightly constrain the shallow subsurface. Individual geologic boundaries were projected in a GIS system from the last two subsurface control points to the land surface. Additionally, outcrop boundaries and surface elevations were used to calculate average formation dip at the outcrop. Finally, Landsat 7+ETM and characteristics of surface topography were used to attempt to distinguish major sand and shale regions in the outcrop. These could then be tied to major lithologic bodies identified in the subsurface.
Results will be forwarded to TWDB for their consideration in revising official aquifer boundaries. These methods have been comparatively simple to apply and should be considered in future aquifer characterization and modeling efforts.
See more from this Division: Gulf Coast Association of Geological Societies
See more from this Session: Environmental Geology I and Hydrology