HR: 08:15h
AN: H11K-02    [Abstracts]
TI: Design, implementation and results of an autonomous hydrogeophysical monitoring system to monitor subsurface flow at the Hanford 300 area
AU: * Versteeg, R J
EM: roelof.versteeg@inl.gov
AF: Idaho National Laboratory, PO Box 1625, Idaho Falls, ID 83415, United States
AU: Ward, A
EM: andy.ward@pnl.gov
AF: Pacific Northwest National Laboratory, P.O. Box 999, K9-33, Richland, WA 99352, United States
AB: Time lapse electrical data (both self potential and electrical resistivity data) can provide information on subsurface flow, and over the last several years there has been an increase in the interest of automating hydrogeophysical data acquisition systems. Such systems require both adaptations to hardware and system setup, and a well designed computational backend allowing for the management and processing of such data. The 300 area at Hanford is the location of multiple DOE Office of Science and Environmental Management funded research efforts which seek to understand the groundwater and contaminant behavior at this site. The groundwater head distribution and resulting flow at this site is known to be strongly influenced by the adjacent Columbia river, and there is an interest in mapping out the spatiotemporal flow directions at this site. The site has been extensively characterized using electrical resistivity measurements, and the geometries and resistivities of subsurface formations are well known both from borings and geophysical characterization efforts. In addition, the overall Hanford 300 area contains 8 continuously recording wells which monitor groundwater level and conductivity at the site at 15 minute intervals, as well as adjacent monitoring stations which record river stage. An autonomous, one hundred electrode SP system was installed at the Hanford 300 area over a 300 x 300 m sub part of the site. Data from both the hydrological sensors and geophysical systems is collected automatically, and transferred to a central database server located at the Idaho National Laboratory. Once data is arrived, data qa/qc and data reduction are run automatically to create time lapse maps of self potential values. We will discuss the design, implementation and results obtained with this system (including ongoing modeling and inversion efforts for the data collected with these systems) as well as the potential of these hydrogeophysical monitoring systems to provide insights in to subsurface flow processes.
DE: 1835 Hydrogeophysics
DE: 1872 Time series analysis (3270, 4277, 4475)
DE: 1894 Instruments and techniques: modeling
DE: 1895 Instruments and techniques: monitoring
DE: 3260 Inverse theory
SC: Hydrology [H]
MN: 2007 Fall Meeting