Coupled 2-D Geophysics to Better Characterize Shallow Sand and Gravel Aquifers

Research output: Contribution to conferencePaper

Abstract

Combining profiles of high-resolution seismic and electrical-resistivity data has provided detailed insights into the character of shallow, glacially-derived aquifers in McHenry County, Illinois. These shallow aquifers were deposited within meltwater outwash valleys during multiple glacial episodes. The unconfined aquifers in these valleys are easily accessible and are a primary source of domestic and agricultural water supplies. Thus, it is important to understand their detailed character and distribution.

Miles of seismic reflection profiles were coupled with electrical resistivity profiles to optimize interpretations of aquifer character. Thus, at the same locations, seismic-reflection profiles indicated aquifer boundaries and internal sediment structures, while electrical resistivity profiles indicated textural and facies changes within the aquifer. When combined, these data were complementary to one another and consistent with local and regional interpretations of the geologic framework. Furthermore, the new insights contribute greatly to better understanding how the geologic framework controls groundwater recharge and contamination potential.
Original languageEnglish (US)
DOIs
StatePublished - 2016
EventGSA North-Central 2016 Annual Meeting - University of Illinois at Urbana-Champaign, Champaign, United States
Duration: Apr 18 2016Apr 19 2016
Conference number: 50

Conference

ConferenceGSA North-Central 2016 Annual Meeting
CountryUnited States
CityChampaign
Period4/18/164/19/16

Fingerprint

sand and gravel
geophysics
aquifer
electrical resistivity
seismic reflection
groundwater control
valley
outwash
unconfined aquifer
meltwater
recharge
water supply
sediment

Cite this

Coupled 2-D Geophysics to Better Characterize Shallow Sand and Gravel Aquifers. / Thomason, Jason F.; Larson, Timothy; Ismail, Ahmed; Sargent, Steve.

2016. Paper presented at GSA North-Central 2016 Annual Meeting, Champaign, United States.

Research output: Contribution to conferencePaper

Thomason, JF, Larson, T, Ismail, A & Sargent, S 2016, 'Coupled 2-D Geophysics to Better Characterize Shallow Sand and Gravel Aquifers', Paper presented at GSA North-Central 2016 Annual Meeting, Champaign, United States, 4/18/16 - 4/19/16. https://doi.org/10.1130/abs/2016NC-275594
Thomason JF, Larson T, Ismail A, Sargent S. Coupled 2-D Geophysics to Better Characterize Shallow Sand and Gravel Aquifers. 2016. Paper presented at GSA North-Central 2016 Annual Meeting, Champaign, United States. https://doi.org/10.1130/abs/2016NC-275594
Thomason, Jason F. ; Larson, Timothy ; Ismail, Ahmed ; Sargent, Steve. / Coupled 2-D Geophysics to Better Characterize Shallow Sand and Gravel Aquifers. Paper presented at GSA North-Central 2016 Annual Meeting, Champaign, United States.
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AB - Combining profiles of high-resolution seismic and electrical-resistivity data has provided detailed insights into the character of shallow, glacially-derived aquifers in McHenry County, Illinois. These shallow aquifers were deposited within meltwater outwash valleys during multiple glacial episodes. The unconfined aquifers in these valleys are easily accessible and are a primary source of domestic and agricultural water supplies. Thus, it is important to understand their detailed character and distribution.Miles of seismic reflection profiles were coupled with electrical resistivity profiles to optimize interpretations of aquifer character. Thus, at the same locations, seismic-reflection profiles indicated aquifer boundaries and internal sediment structures, while electrical resistivity profiles indicated textural and facies changes within the aquifer. When combined, these data were complementary to one another and consistent with local and regional interpretations of the geologic framework. Furthermore, the new insights contribute greatly to better understanding how the geologic framework controls groundwater recharge and contamination potential.

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