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Variability Of Electrical Resistivity At The Rice Creek Field Station, Oswego, New York: Implications For The Distribution Of GroundwaterNormal access

Authors: Samuel T. Peavy and David W. Valentino
Event name: 12th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems
Session: Hydrology Forum - Geophysical Applications In Hydrologic Mapping
Publication date: 14 March 1999
Organisations: EEGS
Language: English
Info: Extended abstract, PDF ( 955.59Kb )

Summary:
Electrical resistivity measurements were made to determine the variability of surficial
deposits, the depth to bedrock and to characterize the distribution of groundwater at the Rice
Creek Field Station near Oswego, New York. The field station is underlain by drumlin deposits
and ablation till associated with Pleistocene glaciation. These deposits reside on Ordovician
quartz sandstone of the Oswego Formation that outcrops within 1500 m of the study site.
Locally the Oswego Formation contains subvertical fractures with an average spacing of less than
0.5 m. Twenty offset Wenner electrical resistivity surveys were conducted in June and August of
1998 along trails and across an open field within the field station grounds. Analysis of
pseudosections and simple 1-D modeling and 2-D least squares inversion indicate the following:
1) low resistivity zones associated with perched water tables within the chaotic drumlin deposits;
2) highly variable and resistive near-surface measurements along Rice Creek indicative of large
(>l m diameter) glacial erratics as observed in the creek bed; 3) a transitional zone below -250 ft
elevation of subcircular highs separated by relatively low resistivities that continue into the
deepest portions of the data, which is coincident with the projected depth to bedrock beneath the
field station and is interpreted to be an undersaturated zone within the fractured Oswego
Sandstone; and 4) low resistivities below an elevation of - 190 ft are interpreted to be the top of
the saturated domain within the fractured bedrock.

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