Kyle Withers University of Arizona Acknowledgements: James Callegary USGS Space Grant Symposium April 18, 2009 Using Geophysical and GIS Methods to Develop.

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Kyle Withers University of Arizona Acknowledgements: James Callegary USGS Space Grant Symposium April 18, 2009 Using Geophysical and GIS Methods to Develop a Hydrogeologic Framework for the Upper Santa Cruz River Basin

 Upper Santa Cruz Basin  Surface water is scarce  Population is growing  Need to understand hydrogeology of subsurface to understand temporal and spatial variability of groundwater

 Develop an understanding of hydrologically significant spatial variations in alluvium and rock in the basin  Use techniques of geophysics (electromagnetic and magnetic) to describe and quantify the hydrogeologic framework  Estimate depth to bedrock and variations in the porosity of alluvium that effect movement of groundwater

Geologic mapping Borehole data (observations, core sent for laboratory measurements, geophysical logs) Surface and airborne geophysics Forward and inverse modeling of geophysical data Combine to develop 2-D geologic cross-sections 3-D interpolation to Solid Model

 Airborne surveys were flown to collect electromagnetic and magnetic data  GeoTEM: digital time-domain electromagnetic system operated by Fugro Airborne Surveys airborne.com/ser vice/geotem_syst em_specs.php airborne.com/ser vice/geotem.php

 ArcMap: software used to develop geographic information systems (GIS) for visualizing, managing, creating, and analyzing geographic data.

 Emigma V8.1: Numerical solutions for electromagnetic, gravity, magnetic, and other applications integrating data processing, simulation, inversion and imaging software as well as other associated tools.

 Forward Modeling: build physical model of system (e.g. 3D below-ground spatial distribution of electrical conductivity)  Calculate numerically the propagation of electromagnetic fields  Simulate instrument output (dB/dt)

 Inverse Modeling: derive physical model from observations/measurements  Run forward model numerous times varying layer thickness and electrical conductivity while minimizing the difference between simulated and observed values  Weakness: solutions are nonunique  Compare and constrain with measured data to arrive at plausible model

 Preliminary results indicate that simple models of the subsurface capture first order variations in electrical properties  Magnetic data measured during TEM flights correspond well with aeromagnetic map for state (Sweeney, R.E., and Hill, P.L., Arizona Aeromagnetic and Gravity Maps and Data: A Web Site for Distribution of Data: U.S. Geological Survey Open-File Report )