Stratigraphic sequence map for groundwater assessment and protection of unconsolidated aquifers: A case example in the Abitibi-Témiscamingue region, Québec, Canada

Nadeau, Simon; Rosa, Éric; Cloutier, Vincent

doi:10.1080/07011784.2017.1354722

Cited by 15 publications

(12 citation statements)

References 19 publications

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“…Further support was provided by observations made in groundwater monitoring wells completed in eskers and moraines of the region (Nadeau et al, ). Here, the elevations of the lines defining the contacts between eskers and peatlands were compared with the elevation of the surface of the SC unit (RHU‐D; SC vertex) as evaluated by Nadeau et al (; Figure ). The data reveals that the peatland/esker contacts of the region are on average 5.5 m above the elevation reached by RHU‐D.…”

Section: Discussionmentioning

confidence: 99%

“…Comparison between the elevation of the contacts between peatlands and the sand/gravel unit (RHU‐C) on the y ‐axis and that of the regional silt/clay unit (RHU‐D) on the x ‐axis. Each point in the graph corresponds to one 100 × 100 m cell of the regional grid as described in Nadeau et al (). The data reveal that numerous contacts are found at an elevation greater than that of the RHU‐D.…”

Section: Discussionmentioning

confidence: 99%

“…Such subdivisions will be useful for illustrating the variations in peatland characteristics as a function of elevation. Finally, the elevations of the contacts between peatlands and glaciofluvial formations are based on a DEM constructed on a 100 × 100 m mesh (Nadeau et al, ).…”

Section: Methodsmentioning

confidence: 99%

“…SG = sand/gravel vertex; BT = bedrock/till vertex; SC = silt/clay vertex; O = outflow vertex; F = flow through vertex; L = lacustrine/riverine vertex; RHU = regional hydrogeological unit inventory projects supported by Québec's ministry of Environment and regional partners (Cloutier et al, 2013. The regional geomorphology is inherited from the rugged Precambrian Shield topography, covered in places by thick accumulations of glacial, glaciofluvial, and glaciolacustrine deposits (Nadeau, Rosa, & Cloutier, 2017;Nadeau, Rosa, Cloutier, Daigneault, & Veillette, 2015). Surface elevations range between 570 and 174 m, with a regional average of 304 m. The region encompasses the continental water divide between the St. Lawrence River and James Bay basins (Figure 1).…”

Section: Geological Framework and Environmental Settingmentioning

confidence: 99%

“…In RHU-F, it is assumed that water preferentially circulates within the acrotelm, macropores, and piping networks. The hydrological framework of the study area is further described in Nadeau et al (2017) and Rey, Rosa, Cloutier, and Lefebvre (2017).…”

Section: Hydrogeological Frameworkmentioning

confidence: 99%

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A graphical approach for documenting peatland hydrodiversity and orienting land management strategies

Rosa

Dallaire

Nadeau

et al. 2018

Hydrological Processes

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This study focuses on the development of an approach to document the hydrological characteristics of peatlands and understand their potential influence on runoff processes and groundwater flow dynamics. Spatial calculations were performed using geographic information systems data in order to evaluate the distribution of peatlands according to (a) neighbouring hydrogeological units and (b) their position within the hydrographic network. The data obtained from these calculations were plotted in a multiple trilinear diagram (two ternary plots projected into a diamond‐shaped diagram) that illustrates the position of a given peatland within the hydrogeological environment. The data allow for the segregation of peatlands according to groups sharing similarities as well as the identification of peatlands that are most likely to have similar hydrological functions. The approach was tested in a 19,549 km2 region of the southern portion of the Barlow‐Ojibway Clay Belt (in Abitibi‐Témiscamingue, Canada) and lead to a conceptual model representing the hydrological interactions between peatlands, aquifers, and surface waters. This approach allows for a geographic information systems‐based differentiation of headwater peatland complexes that are likely to interact with aquifers and to supply continuous baseflow to small streams from lowland peatland complexes of the clay plain that are isolated from surrounding aquifers but that can act as storage reservoirs within the hydrographic network. The typology is further used to discuss land management strategies aimed at preserving peatland hydrodiversity within the study region. The proposed approach relies on widely applicable hydrogeological and hydrographic criteria and provides a tool that could be used for assessing peatland hydrodiversity in other regions of the planet.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Geological Framework and Environmental Settingmentioning

confidence: 99%

Section: Hydrogeological Frameworkmentioning

confidence: 99%

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