| Title | Field characterization and data integration to define the hydraulic heterogeneity of a shallow granular aquifer at a sub-watershed scale |
| Author | Paradis, D; Tremblay, L; Lefebvre, R; Gloaguen, E; Rivera, A; Parent, M; Ballard, J M; Michaud, Y; Brunet, P |
| Source | Environmental Earth Sciences vol. 72, issue 5, 2014 p. 1325-1348, https://doi.org/10.1007/s12665-014-3318-2 |
| Year | 2014 |
| Alt Series | Earth Sciences Sector, Contribution Series 20130426 |
| Publisher | Springer |
| Document | serial |
| Lang. | English |
| Media | paper; digital; on-line |
| File format | pdf; html |
| Subjects | hydrogeology; geophysics; aquifer tests; groundwater flow; hydraulic analyses; integration; penetrometers; electrical resistivity; hydraulic conductivity; porosity; pollution; heavy metals
contamination; hydrofacies; contaminant transport; relevance vector machine (RVM); direct-push hydrogeophysics |
| Illustrations | flow charts; flow diagrams; geological sketch maps; photographs; tables; histograms |
| |
| Program | Aquifer Assessment & support to mapping, Groundwater Geoscience |
| Abstract | Providing a sound basis for aquifer management or remediation requires that hydrogeological investigations carried out to understand groundwater flow and contaminant transport be based on representative
data that capture the heterogeneous spatial distribution of aquifer hydraulic properties. This paper describes a general workflow allowing the characterization of the heterogeneity of the hydraulic properties of granular aquifers at an intermediate
scale covering a few km2. The workflow involves characterization and data integration steps that were applied on a 12 km2 study area encompassing a decommissioned landfill emitting a leachate plume and its main surface water receptors. The sediments
composing the aquifer were deposited in a littoral-sublittoral environment and show evidence of small-scale transitional heterogeneities. Cone penetrometer tests (CPT) combined with soil moisture and electrical resistivity (SMR) measurements were
thus used to identify and characterize spatial heterogeneities in hydraulic properties over the study area. Site-specific statistical relationships were needed to infer hydrofacies units and to estimate hydraulic properties from high-resolution
CPT/SMR soundings distributed all over the study area. A learning machine approach was used due to the complex statistical relationships between colocated hydraulic and CPT/SMR data covering the full range of aquifer materials. Application of this
workflow allowed the identification of hydrofacies units and the estimation of horizontal hydraulic conductivity, vertical hydraulic conductivity and porosity over the study area. The paper describes and discusses data acquisition and integration
methodologies that can be adapted to different field situations, while making the aquifer characterization process more time-efficient and less labour-intensive. |
| Summary | (Plain Language Summary, not published)
Providing a sound basis for aquifer management or remediation requires that hydrogeological investigations carried out to understand groundwater flow and
contaminant transport be based on representative data that capture the heterogeneous spatial distribution of aquifer hydraulic properties. This paper describes a general workflow allowing the characterization of the heterogeneity of the hydraulic
properties of granular aquifers at an intermediate scale covering a few km2. Application of this workflow allowed the identification of hydrofacies units and the estimation of horizontal hydraulic conductivity, vertical hydraulic conductivity and
porosity over the study area, making the aquifer characterization process more time-efficient and less labour-intensive. |
| GEOSCAN ID | 293555 |
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