HR: 1340h
AN: H33B-0470    [Abstracts]
TI: 2D Resistivity in Discontinuous Permafrost, Fort Wainwright, Alaska
AU: * Astley, B N
EM: Beth.N.Astley@erdc.usace.army.mil
AF: Cold Regions Research and Engineering Laboratory, PO Box 5646, Fort Richardson, AK 99505 United States
AU: Snyder, C F
EM: csnyder@opaliaenv.com
AF: Opalia Environmental, 25 Monroe Place Apt 11F, Brooklyn, NY 11201 United States
AU: Sturtevant, K
EM: ks58@buffalo.edu
AF: University of Buffalo, 876 Natural Sciences Complex, Buffalo, NY 14260 United States
AB: 2D resistivity profiles were collected in an area containing discontinuous permafrost, fractured bedrock, and groundwater contamination on Fort Wainwright, Alaska in June 2004. The stratigraphy consists of the Chena Alluvium over weathered and fractured Birch Hill Schist. Contaminant migration pathways are complex due to numerous fractures and frozen zones. Our purpose was to supplement existing permafrost data and to identify other features that might influence ground water flow and contaminant transport. This study used an Iris Instruments Syscal Pro-ten, 10-channel switch resistivity meter and a 96-electrode cable with 5-meter electrode spacing. Three resistivity array configurations were used during this study: dipole-dipole, Wenner and Schlumberger. Resistivity models were generated with RES2DINV software and were compared along identical profiles for the three array types. Modeled resistivity values of over 2000 ohm-m were interpreted as permafrost in most cases based on previous resistivity studies at the site. Borehole logs and known frozen zones from monitoring wells were used to verify the permafrost interpretations. Dynamic Graphics software EarthVision was used to generate a 3-D permafrost model of the area. This model was updated at the completion of the 2D resistivity survey.
DE: 1823 Frozen ground
DE: 1829 Groundwater hydrology
DE: 1832 Groundwater transport
DE: 1894 Instruments and techniques
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting