Numerical Simulation of Groundwater Flow in the Chateauguay River Aquifers

Lavigne, Marc-André; Nastev, Miroslav; Lefebvre, René

doi:10.4296/cwrj3504469

Cited by 32 publications

(27 citation statements)

References 18 publications

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“…The global water balance derived from the steadystate simulation with the numerical groundwater flow model is presented in Figure 2 (Lavigne et al, 2010 discharge zone in the region. Underflow accounts for a loss of 3 Mm 3 /yr (1%) from the aquifer system on the eastern part of the model domain.…”

Section: Groundwater Balancementioning

confidence: 99%

“…The calibrated steady-state numerical groundwater flow model described by Lavigne et al (2010) was used to simulate predictive scenarios considering increased stress conditions, and transient flow. Hypothetical scenarios for future groundwater consumption were also tested in order to define the aquifer sensitivity to increased groundwater demand.…”

Section: Regional Sustainabilitymentioning

confidence: 99%

“…The simulated potentiometric surfaces are shown in Figure 5. Figure 5a shows the potentiometric surface for average climate conditions (Lavigne et al, 2010). Figures 5b and 5c illustrate the difference between the average steady-state water levels ( Figure 5a) and those simulated for humid and dry flow conditions, respectively, i.e., the potentiometric head differences.…”

Section: Zoning Of Aquifer Sensitivitymentioning

confidence: 99%

“…Maximum differences in water levels observed for both cases can reach more than 10 m for recharge variations of a few millimetres. As discussed in Lavigne et al (2010), high vertical anisotropy values were assumed in the numerical model to match the observed relatively high groundwater levels on Covey Hill. Such anisotropies make the model sensitive to recharge variations.…”

Section: Zoning Of Aquifer Sensitivitymentioning

confidence: 99%

“…Hydrogeological studies relevant to the assessment of "sustainable yield" included groundwater recharge estimation (Croteau et al, 2010) and numerical modelling of groundwater flow (Lavigne et al, 2010). The current study presents an approach that integrates the various conditions that should be considered to delineate priority groundwater management zones, and formulates the results into a simple index that can be used by non-specialists.…”

Section: Introductionmentioning

confidence: 99%

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Regional Sustainability of the Chateauguay River Aquifers

Lavigne¹,

Nastev²,

Lefebvre³

2010

Canadian Water Resources Journal

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Abstract:A steady increase in groundwater use in the Chateauguay River watershed has led to potential conflicts between various groundwater users. This study summarizes the quantity and sustainability estimations of the groundwater resources within this basin. Regional sustainability is defined with simulated drawdowns from uniform withdrawal scenarios compared to water levels obtained without any withdrawal. Three sustainable conditions are defined: sustainable withdrawal, withdrawal with increased drawdown, and unsustainable withdrawal. The current withdrawal rate of 34 Mm 3 /yr results in a median drawdown of 1.5 m, compared to pre-development conditions. This drawdown is well within the range considered sustainable, an indication that regional aquifers are not currently overexploited. A hypothetical pumping rate of 48 Mm 3 /yr, resulting in an average drawdown of 2.2 m, is the estimated sustainable limit. Increasing exploitation from 48 to 122 Mm 3 /yr would need tight control and planning. Withdrawal rates beyond 122 Mm 3 /yr are judged not sustainable as the regional median drawdown would exceed 8 m. The water levels in recharge areas are the most sensitive to groundwater extraction. The combination of aquifer sensitivity to recharge variations, simulated drawdown maps, and aquifer vulnerability to surface contamination reveals the most sensitive areas of the regional aquifers, areas that would need particular attention and protection by groundwater managers.Résumé : L'accroissement soutenu de l'utilisation de l'eau souterraine dans le bassin versant de la rivière Chateauguay pourrait conduire à des conflits d'usages potentiels entre les différents types d'utilisateurs. La présente étude résume les évaluations de la quantité et de la pérennité des ressources en eau souterraine. Le niveau régional d'exploitation durable est défini à partir des rabattements simulés pour des scénarios de prélèvement uniforme sur toute la région, par rapport aux niveaux d'eau simulés sans exploitation. Le présent niveau d'exploitation totale estimé à 34 Mm 3 /a entraîne des rabattements moyens de 1,5 m, comparé aux conditions sans exploitation. Ce rabattement se situe bien en deçà du niveau jugé durable, ce qui indique que les aquifères régionaux ne sont pas surexploités présentement. Un niveau d'exploitation théorique de 48 Mm 3 /a, qui entraîne des rabattements moyens de 2,2 m, est considéré être la limite du niveau d'exploitation durable. Une augmentation du niveau d'exploitation de 48 à 122 Mm 3

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Section: Groundwater Balancementioning

confidence: 99%

Section: Regional Sustainabilitymentioning

confidence: 99%

Section: Zoning Of Aquifer Sensitivitymentioning

confidence: 99%

Section: Zoning Of Aquifer Sensitivitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Regional Sustainability of the Chateauguay River Aquifers

Lavigne¹,

Nastev²,

Lefebvre³

2010

Canadian Water Resources Journal

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Comparison of two modeling approaches for groundwater–surface water interactions

Guay

Nastev

Paniconi

et al. 2012

Hydrological Processes

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An assessment of interactions between groundwater and surface water was carried out by applying two different modeling approaches to a small-scale study area in the municipality of Havelock, Quebec. The first approach involved a commonly used sequential procedure that consists in determining the daily recharge rate using a quasi 2D infiltration model (HELP), applied in the next step as an imposed flux to a 3D finite-element groundwater flow model. The flow model was calibrated under steadystate and transient conditions against measured water levels. The second approach was based on a recently developed physically based, 3D fully coupled groundwater-surface water flow model (CATHY) applied to the entire flow domain in an integrated manner. Implementation, calibration, and results of the simulations for both approaches are presented and discussed. For equal annual precipitation (1038 mm/y) and evapotranspiration (556 mm/y), the second approach computed a recharge rate of 233 mm/ y (8.9% higher than the first approach) and a net upward flow from the fractured aquifer (the first approach predicted a net downward flow to the rock). The simulated annual discharge was similar for the two approaches (9.6% difference). Both approaches were found to be useful in understanding the interactions between groundwater and surface water, although limitations are apparent in the sequential procedure's inability to account for surface-subsurface feedbacks, for instance near stream reaches where groundwater discharge is prevalent. The decoupled, two-model approach provides disaggregated surface, vadose, and aquifer flows, and a simple aperçu at the different components of total discharge. The fully coupled model accounts for continuous water exchanges between the land surface, subsurface, and stream channel in a more complex manner, and produces a better match against observed data.

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Dynamics of a headwater system and peatland under current conditions and with climate change

Levison

Larocque

Fournier

et al. 2013

Hydrological Processes

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Interactions between headwater aquifers and peatlands have received limited scientific attention. Hydrological stresses, including those related to climate change, may adversely impact these interactions. In this study, the dynamics of a southern Québec headwater system where a peatland is present is simulated under current conditions and with climate change. The model is calibrated in steady state on field‐measured data and provides satisfactory results for transient‐state conditions. Under current conditions, simulations confirm that the peatland is fed by the fractured bedrock aquifer year‐round and provides continuous baseflow to its outlets. Climate change is simulated through its impact on groundwater recharge. Predicted precipitation and temperature data from a suite of regional climate model scenarios provide a net precipitation variation range from +10% to −30% for the 2041–2070 horizon. Calibrated recharge is modified within this range to perform a sensitivity analysis of the headwater model to recharge variations (+10%, −15% and −30%). Total contribution from the aquifer to rivers and streams varies from +14% to −44% of the baseline for +10% to −30% recharge changes from spring 2010 data, for example. With higher recharge, the peatland receives more groundwater, which could significantly change its vegetation pattern and eventually ecosystem functions. For a −30% recharge, the peatland becomes perched above the aquifer during the summer, fall and winter. Recharge reductions also induce sharp declines in groundwater levels and drying streams. Copyright © 2013 John Wiley & Sons, Ltd.

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Numerical Simulation of Groundwater Flow in the Chateauguay River Aquifers

Cited by 32 publications

References 18 publications

Regional Sustainability of the Chateauguay River Aquifers

Regional Sustainability of the Chateauguay River Aquifers

Comparison of two modeling approaches for groundwater–surface water interactions

Dynamics of a headwater system and peatland under current conditions and with climate change

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