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Subsurface heterogeneity in the geological and hydraulic properties of the hummocky Paris Moraine, Guelph, Ontario

Emmanuelle Arnaud, Michael McGill, Andrew Trapp and James E. Smith
Subsurface heterogeneity in the geological and hydraulic properties of the hummocky Paris Moraine, Guelph, Ontario (in Quaternary geology of southern Ontario and applications to hydrogeology, Hazen A. J. Russell (editor), Emmanuelle Arnaud (editor), Andrew F. Bajc (editor) and David R. Sharpe (editor))
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre (July 2018) 55 (7): 768-785

Abstract

The advance and retreat of ice lobe margins of the Laurentide Ice Sheet formed moraines that are a prevalent feature throughout southwestern Ontario. In contrast to the well-studied stratified moraine complexes, recessional and end moraines have largely been ignored in the context of hydrogeological studies. Recent urban growth has led to development pressures on these moraines and a need to better understand their hydrogeology. This study presents data sets from the Paris Moraine near Guelph, Ontario, to examine its geomorphology, internal composition, and the corresponding hydraulic properties of these ice-marginal features. The moraine's geomorphic elements were mapped using high-resolution Global Positioning System transects, aerial photograph analysis, and ground truthing. Nine continuous sediment cores were recovered to determine the nature and distribution of subsurface sedimentary units and their relation to the regional stratigraphic framework. Cores were described in detail using standard sedimentological techniques, and significant sediment heterogeneity was observed in cross sections. Grain-size analyses of over 150 samples provide site-specific estimates of saturated hydraulic conductivity. In addition, saturated hydraulic conductivity was measured on 104 samples using the falling head permeameter method. This study found that different scales of sediment heterogeneity occur across the moraine and the associated till plain and outwash. In contrast, the hydraulic conductivity varies much less. It is expected that certain sedimentary units at specific depths will impact groundwater flow at the centimetre to hundreds of metres scale, which is significant in environmental site assessments or for understanding contaminant hydrogeological problems.


ISSN: 0008-4077
EISSN: 1480-3313
Coden: CJESAP
Serial Title: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre
Serial Volume: 55
Serial Issue: 7
Title: Subsurface heterogeneity in the geological and hydraulic properties of the hummocky Paris Moraine, Guelph, Ontario
Title: Quaternary geology of southern Ontario and applications to hydrogeology
Author(s): Arnaud, EmmanuelleMcGill, MichaelTrapp, AndrewSmith, James E.
Author(s): Russell, Hazen A. J.editor
Author(s): Arnaud, Emmanuelleeditor
Author(s): Bajc, Andrew F.editor
Author(s): Sharpe, David R.editor
Affiliation: University of Guelph, School of Environmental Sciences, Guelph, ON, Canada
Affiliation: Canadian Geological Survey, Ottawa, ON, Canada
Pages: 768-785
Published: 201807
Text Language: English
Summary Language: French
Publisher: National Research Council of Canada, Ottawa, ON, Canada
References: 74
Accession Number: 2018-082145
Categories: Quaternary geologyHydrogeology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sect., strat. cols., 3 tables, geol. sketch maps
N43°34'00" - N43°34'00", W80°16'00" - W80°16'00"
Secondary Affiliation: McMaster University, CAN, Canada
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data from Canadian Science Publishing, NRC Research Press, Ottawa, ON, Canada. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2018
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