Assessing rock aquifer vulnerability using downward advective times from a 3D model of surficial geology: A case study from the St. Lawrence Lowlands, Canada
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| Format: | Artículo científico |
| Langue: | en |
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Universidad Nacional Autónoma de México
2004
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| _version_ | 1876442828365627392 |
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| author | Martin Ross |
| author_facet | Martin Ross |
| contents | Assessing rock aquifer vulnerability using downward advective times from a 3D model of surficial geology: A case study from the St. Lawrence Lowlands, Canada Martin Ross Richard Martel René Lefebvre Michel Parent Martine M. Savard Ciencias de la Tierra 3D geologic modeling Quaternary sediments Aquifer vulnerability regional hydrogeology An aquifer vulnerability assessment method which relates vulnerability directly to groundwater Downward Advective Time(DAT) from a 3D geologic model is tested over a 1400 km2 area in the St. Lawrence Lowlands in SW Québec. The goal was toassess the vulnerability of the regional rock aquifer which is overlain by discontinuous and unconsolidated Quaternary units.Hydrogeologic parameters such as groundwater recharge and porosity of each unit overlying the aquifer were integrated to agOcad 3D stratigraphic grid. This grid was generated from a 3D geologic model made of interlocked surfaces representing theboundaries of Quaternary units and the underlying bedrock topography. Calculations were carried out using a deterministic approachand DAT estimates were obtained for 74% of the model area. Results are tentatively grouped into 6 DAT classes which areinterpreted in terms of a relative vulnerability index. The spatial distribution of this index is in good agreement with thehydrogeological settings and available hydrogeochemical data. Results indicate that 40% of the evaluated area falls within themoderately high to very high vulnerability classes. Comparison between this map and a DRASTIC map of the same area revealssome significant discrepancies, particularly in areas of shallow depth to bedrock which are characterized by fast DAT through athick unsaturated zone. In these areas DRASTIC produces low vulnerability scores while this assessment yields high vulnerabilityranking. Overall, this assessment provides a sound basis for regional planning and decision making. 2004 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56843408 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.4 Vol.43 |
| format | Artículo científico |
| id | redalyc_56843408 |
| institution | Redalyc |
| language | en |
| publishDate | 2004 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | Assessing rock aquifer vulnerability using downward advective times from a 3D model of surficial geology: A case study from the St. Lawrence Lowlands, Canada Martin Ross Ciencias de la Tierra 3D geologic modeling Quaternary sediments Aquifer vulnerability regional hydrogeology Assessing rock aquifer vulnerability using downward advective times from a 3D model of surficial geology: A case study from the St. Lawrence Lowlands, Canada Martin Ross Richard Martel René Lefebvre Michel Parent Martine M. Savard Ciencias de la Tierra 3D geologic modeling Quaternary sediments Aquifer vulnerability regional hydrogeology An aquifer vulnerability assessment method which relates vulnerability directly to groundwater Downward Advective Time(DAT) from a 3D geologic model is tested over a 1400 km2 area in the St. Lawrence Lowlands in SW Québec. The goal was toassess the vulnerability of the regional rock aquifer which is overlain by discontinuous and unconsolidated Quaternary units.Hydrogeologic parameters such as groundwater recharge and porosity of each unit overlying the aquifer were integrated to agOcad 3D stratigraphic grid. This grid was generated from a 3D geologic model made of interlocked surfaces representing theboundaries of Quaternary units and the underlying bedrock topography. Calculations were carried out using a deterministic approachand DAT estimates were obtained for 74% of the model area. Results are tentatively grouped into 6 DAT classes which areinterpreted in terms of a relative vulnerability index. The spatial distribution of this index is in good agreement with thehydrogeological settings and available hydrogeochemical data. Results indicate that 40% of the evaluated area falls within themoderately high to very high vulnerability classes. Comparison between this map and a DRASTIC map of the same area revealssome significant discrepancies, particularly in areas of shallow depth to bedrock which are characterized by fast DAT through athick unsaturated zone. In these areas DRASTIC produces low vulnerability scores while this assessment yields high vulnerabilityranking. Overall, this assessment provides a sound basis for regional planning and decision making. 2004 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56843408 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.4 Vol.43 |
| title | Assessing rock aquifer vulnerability using downward advective times from a 3D model of surficial geology: A case study from the St. Lawrence Lowlands, Canada |
| topic | Ciencias de la Tierra 3D geologic modeling Quaternary sediments Aquifer vulnerability regional hydrogeology |
| url | https://www.redalyc.org/articulo.oa?id=56843408 |