Provenance of buried esker groundwater: the case of Vars-Winchester esker aquifer, Eastern Ontario, Canada

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• 作者：Jacques Sauriol
• 关键词：Canada ; Groundwater recharge/water budget ; Groundwater/surface ; water relations ; Hydraulic properties ; Marine mud layering deformation
• 刊名：Hydrogeology Journal
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：24
• 期：1
• 页码：123-139
• 全文大小：3,164 KB
• 参考文献：Anderson MP, Woessner WW (1992) Applied groundwater modeling. Academic, San Diego, CA, 381 pp
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  Sauriol J (2015) Pressure pulses as an indication of recharge to a buried esker-aquifer Eastern Ontario. IAH Conference, Waterloo, Canada, October 2015, 10 pp
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• 作者单位：Jacques Sauriol (1)
  
  1. 289 François-de Lévis, Gatineau, Québec, Canada, J8Z 1A3
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Hydrogeology
  Geology
  Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1435-0157

文摘

An innovative mode of groundwater recharge to a buried esker aquifer is considered. The current conceptual model affords a natural safeguard to underlying aquifers from the overlying muds. A hypothesis of groundwater recharge to a buried esker aquifer via preferential pathways across its overlying muds is tested here by heuristic numerical one-dimensional and two-dimensional modeling simulations. The hypothesis has been tested against two other conventionally accepted scenarios involving: (1) distal esker outcrop areas and (2) remote shallow-bedrock recharge areas. The main evidence comes from documented recharge pressure pulses in the overlying mud aquitard and in the underlying esker hydraulic-head time series for the Vars-Winchester esker aquifer in Eastern Ontario, Canada. These perturbations to the potentiometric surface are believed to be the aquifer response to recharge events. The migration rate of these pressure pulses is directly related to the hydraulic diffusivity of the formation. The measured response time and response amplitude between singular radar precipitation events and well hydrographs constituted the heuristic model calibration targets. The main evidence also includes mud-layering deformation (water escape features) which was observed in seismic surveys of the over-esker muds. These disturbed stratigraphic elements provide a realistic mechanism for migrating water to transit through the muds. The effective hydraulic conductivities of these preferential pathways in the muds were estimated to be between 2 × 10−6 and 7 × 10−6 m/s. The implications of these findings relate to the alleged natural safeguard of these overlying muds. Keywords Canada Groundwater recharge/water budget Groundwater/surface-water relations Hydraulic properties Marine mud layering deformation