HR: 1340h
AN: H33E-0512    [Abstracts]
TI: Forward and Inverse Simulations of Electrical Resistivity Tomography to Demonstrate the Resolution of Fine-Scale Hydrological Features Within Heterogeneous Unsaturated Media
AU: * LaBrecque, D J
EM: dlabrec887@yahoo.com
AF: Multiphase Technologies, LLC, 310 Rebecca Drive , Sparks, NV 89436 United States
AU: Sharpe, R N
EM: 'rsharpe@mpt3d.com'
AF: Multiphase Technologies, LLC, 310 Rebecca Drive , Sparks, NV 89436 United States
AU: Brainard, J R
EM: jrbrain@sandia.gov
AF: Sandia National Labortories, P.O. Box 5800 M.S. 0735, Albuquerque, NM 87185
AU: Alumbaugh, D L
EM: alumbaug@cae.wisc.edu
AF: University of Wisconsin-Madison, 2258 Engineering Hall 1415 Engineering Dr , Madison, WI 53706 United States
AB: Converting hydrological parameters from very high-resolution flow simulations to electrical conductivity created synthetic electrical resistivity tomography data. The data were then forward modeled using very fine, high-resolution meshes and inverted using the same coarse meshes that were used for normal inversion of field data. The goal was to simulate earlier results from the Sandia-Tech Vadose Zone Facility, a state-of-the-art infiltration facility where geophysical imaging techniques were employed to monitor the unsaturated flow of potable water and transport of a salt tracer through fluvial sediments. We discuss the relative resolution of the ERT compared to the original hydrological models. We also discuss the effects on resolution of mesh design and the values assigned to various modeling parameters. Finally we compare the optimized parameters of this study with those used during the field program.
DE: 1800 HYDROLOGY
DE: 1875 Unsaturated zone
DE: 1894 Instruments and techniques
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting