Efficiency comparison of graphical approaches for designing contaminant detection networks in groundwater

Hudak, Paul F.

doi:10.1029/2001wr001152

Cited by 10 publications

(7 citation statements)

References 15 publications

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“…Hudak (2001) devised a graphical approach to configure detection wells at the downgradient of a landfill. The author evaluated detection capabilities of graphically designed perpendicular and equidistant groundwater monitoring networks in aquifers dominated by intergranular porosity in his later work (Hudak, 2002). However, in both studies he did not consider the uncertainties due to the subsurface heterogeneity and contaminant leak location.…”

Section: Introductionmentioning

confidence: 98%

Reliability assessment of groundwater monitoring networks at landfill sites

Yenigül

Elfeki

Gehrels

et al. 2005

Journal of Hydrology

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Section: Introductionmentioning

confidence: 98%

Reliability assessment of groundwater monitoring networks at landfill sites

Yenigül

Elfeki

Gehrels

et al. 2005

Journal of Hydrology

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“…Additional networks were obtained by compressing (perpendicular to groundwater flow) well locations in equalspaced networks closer to the downgradient corner of the landfill. Previous work (Hudak, 2002) showed that slightly compressed networks were effective for detecting chemical releases from landfills. in the equal-spaced network occupy centrelines of ten equal-width flow tubes.…”

Section: Methodsmentioning

confidence: 99%

Groundwater monitoring strategies for variable contaminant migration boundaries

Hudak

2006

Hydrological Sciences Journal

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Detection efficiencies of alternative groundwater monitoring networks were evaluated in relation to distance to a buffer zone (contaminant migration) boundary. This boundary establishes a distance limit within which contaminant plumes should pass through monitoring wells, located on curvilinear segments (monitoring loci) near a waste storage facility. Alternative strategies allocated monitoring wells to loci at specified distances, measured parallel to groundwater flow, from the downgradient boundaries of a landfill. One approach constrained wells to equal spacing, measured perpendicular to groundwater flow. Compressing well locations 10% closer to the downgradient corner of the landfill rendered alternative monitoring configurations. Computations by a monitoring efficiency model indicated: (a) networks largely maintained detection efficiency for different contaminant migration boundaries; (b) one network most efficiently attained a target detection capability for all contaminant migration boundaries; and (c) compressed networks slightly outperformed equal-spaced counterparts. Compressed networks with more wells along closer monitoring loci best maintained the detection efficiency when shifting the contaminant migration boundary closer to the landfill. Procedures described in this paper may be useful for examining trade-offs between monitoring efficiency and distance limits of contaminant travel at landfills posing potential hazards to underlying groundwater.Key words contaminant migration; groundwater monitoring; landfill; monitoring network Stratégies de suivi hydrogéologique selon la variabilité de la limite de migration d'un contaminant Résumé L'efficacité, du point de vue de la détection de la migration d'un contaminant, de réseaux alternatifs de suivi hydrogéologique a été évaluée par rapport à la distance à la limite d'une zone tampon. Cette limite établit une distance limite en deçà de laquelle les panaches de contamination devraient passer à travers les puits d'observation, situés sur des segments curvilinéaires (transects courbes de suivi) à proximité d'un site de stockage de déchets. Des stratégies alternatives ont affecté des puits d'observation sur des transects caractérisés par leur distance, mesurée parallèlement à l'écoulement souterrain, à partir des limites aval d'un site d'enfouissement. Une approche a imposé un espacement régulier des puits, mesuré perpendiculairement à l'écoulement souterrain. La densification des puits, plus proches de 10%, à proximité de l'angle aval du site d'enfouissement, a produit des configurations de suivi alternatives. Les calculs d'un modèle d'efficacité du suivi ont indiqué que: (a) les réseaux conservent largement leur efficacité de détection pour différentes limites de migration du contaminant; (b) un des réseaux est plus efficace pour atteindre une capacité de détection cible, quelle que soit la limite de migration du contaminant; et (c) les réseaux densifiés donnent un résultat légèrement meilleur que leurs équivalents à espacement régulier. Les résea...

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“…Storck et al (1997) extended this model to three dimensions incorporating local dispersion. Hudak (2002) presented a deterministic graphical approach to evaluate detection capabilities of perpendicular and equidistant ground water monitoring networks in aquifers dominated by intergranular porosity. Mahar and Datta (1997) used an optimization approach to design a ground water quality monitoring network and to identify the source of contamination.…”

Section: Problem Definitionmentioning

confidence: 99%

“…They did not address the effects of parameter uncertainty in their work. Hudak (2002) presented a deterministic graphical approach to evaluate detection capabilities of perpendicular and equidistant ground water monitoring networks in aquifers dominated by intergranular porosity.…”

Section: Problem Definitionmentioning

confidence: 99%

New Approach for Ground Water Detection Monitoring at Lined Landfills

Yenigül¹,

Elfeki²,

Akker³

2006

Groundwater Monitoring Rem

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The design of a ground water detection monitoring system at a lined landfill is complicated due to uncertainties in contaminant source characteristics and variability of hydrogeological conditions. Maximizing the likelihood of detecting contaminants and minimizing the contaminated area are the conflicting design objectives. Mostly, a large number of wells may be required to achieve the desired efficiency. However, the cost might be quite high from a practical point of view. Moreover, with the conventional monitoring approach, a widely applied three‐well monitoring system (minimum regulatory requirement) is more often inadequate to accomplish these objectives at lined landfills due to the limited capture zone of monitoring wells. Therefore, implementation of a new monitoring approach has been proposed in this study to design a highly efficient, cost‐effective, three‐well system. In this new approach, the main idea is to increase the interception of contaminant plumes at early stages by broadening the capture zone of monitoring well(s) simply by continuous pumping from the monitoring well(s) with a small pumping rate. A hypothetical problem is presented where a Monte Carlo framework is used to incorporate uncertainties due to subsurface heterogeneity and the leak location. A finite‐difference ground water model coupled with a random‐walk particle‐tracking model simulates a contaminant plume released from the landfill for each Monte Carlo realization. The efficiency and the cost of the three‐well monitoring network have been compared for conventional and proposed monitoring approaches (PMA). It has been observed that the efficiency of the monitoring system improves significantly by the application of the PMA.

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Efficiency comparison of graphical approaches for designing contaminant detection networks in groundwater

Cited by 10 publications

References 15 publications

Reliability assessment of groundwater monitoring networks at landfill sites

Reliability assessment of groundwater monitoring networks at landfill sites

Groundwater monitoring strategies for variable contaminant migration boundaries

New Approach for Ground Water Detection Monitoring at Lined Landfills

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