Effective porosity of a carbonate aquifer with bacterial contamination: Walkerton, Ontario, Canada

Worthington, Stephen R. H.; Smart, C. C.; Ruland, W. W.

doi:10.1016/j.jhydrol.2012.07.046

Cited by 38 publications

(24 citation statements)

References 30 publications

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“…This demonstrated that the aquifer does not behave as an EPM for transport. Calibration of MODFLOW to the tracer results gave an effective porosity of 0.05-0.1% (Worthington et al, 2012). The measured rapid velocities resolved the mystery of how the pathogenic bacteria had quickly traveled to the wells.…”

Section: Paleozoic Limestone and Dolostone At Walkerton Ontario Canadamentioning

confidence: 86%

Diagnostic tests for conceptualizing transport in bedrock aquifers

Worthington¹

2015

Journal of Hydrology

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Section: Paleozoic Limestone and Dolostone At Walkerton Ontario Canadamentioning

confidence: 86%

Diagnostic tests for conceptualizing transport in bedrock aquifers

Worthington¹

2015

Journal of Hydrology

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“…Artificial tracers are particularly useful and applicable in karst aquifer systems where transit times are short (thus limiting the required sampling and monitoring periods) and where the sole application of conventional hydrogeological methods, such as piezometric maps and numerical groundwater models, often leads to ambiguous and incomplete results [ Worthington et al ., ]. In karst hydrogeology, artificial tracers can be applied (1) to define underground connections and to delineate spring catchment areas, (2) to estimate geometric and hydraulic properties, such as conduit diameters and flow velocities, and (3) to identify the origin or destination of contaminants, as well as to quantify contaminant transport processes [ Goldscheider et al ., ].…”

Section: Investigation Techniques For Karst Systemsmentioning

confidence: 99%

“…A large number of analytical solutions are available not only for a variety of aquifer types and settings, mostly for porous aquifers, but also for karst aquifers [ Kresic , ]. In karst aquifers, flow is often concentrated in a small number of dissolution‐enlarged bedding planes or fractures [ Worthington et al ., ]. This can lead to discontinuous, stepped drainage characteristics of a pumped well (Figure a).…”

Section: Investigation Techniques For Karst Systemsmentioning

confidence: 99%

Karst water resources in a changing world: Review of hydrological modeling approaches

et al. 2014

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Karst regions represent 7–12% of the Earth's continental area, and about one quarter of the global population is completely or partially dependent on drinking water from karst aquifers. Climate simulations project a strong increase in temperature and a decrease of precipitation in many karst regions in the world over the next decades. Despite this potentially bleak future, few studies specifically quantify the impact of climate change on karst water resources. This review provides an introduction to karst, its evolution, and its particular hydrological processes. We explore different conceptual models of karst systems and how they can be translated into numerical models of varying complexity and therefore varying data requirements and depths of process representation. We discuss limitations of current karst models and show that at the present state, we face a challenge in terms of data availability and information content of the available data. We conclude by providing new research directions to develop and evaluate better prediction models to address the most challenging problems of karst water resources management, including opportunities for data collection and for karst model applications at so far unprecedented scales.

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“…As a result, practical groundwater models are yet to be widely accepted in karst investigations, or else porous medium models are used to over-ride a karst conceptual model. (Worthington & Smart, 2012).…”

Section: Alternative Monitoring Technologiesmentioning

confidence: 99%

Tracking of Karst Contamination Using Alternative Monitoring Technologies: Hidden River Cave Kentucky

Raedts¹,

Smart²

2015

Sinkholes and the Engineering and Environmental Impacts of Karst: Proceedings of the Fourteenth Multidisciplinary Conference

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Karst groundwater contamination presents great challenges for efficient monitoring because of rapid, discrete transport and the diversity of contaminants. Here a low cost approach is described and applied to Hidden River Cave, Kentucky, where a long history of contamination has been experienced. Local knowledge was acquired through informal interviews and coupled with observations of contaminant residues, faunal distributions and fluorescence spectra in the cave. The resulting patterns were interpreted using Google Earth and Street View to identify specific contaminant sources in the affected sub-catchment of the cave. Despite success in matching contaminant sources with the contamination history and pattern, the informal nature of the investigation renders it unacceptable as the basis for any intervention. But such low cost studies will be needed for the majority of contamination occurrences where financial resources are very limited. A radical revision of our adversarial approach to environmental management will be required for such a change to occur.

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Effective porosity of a carbonate aquifer with bacterial contamination: Walkerton, Ontario, Canada

Cited by 38 publications

References 30 publications

Diagnostic tests for conceptualizing transport in bedrock aquifers

Diagnostic tests for conceptualizing transport in bedrock aquifers

Karst water resources in a changing world: Review of hydrological modeling approaches

Tracking of Karst Contamination Using Alternative Monitoring Technologies: Hidden River Cave Kentucky

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