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Deterministic modelling of the cumulative impacts of underground structures on urban groundwater flow and the definition of a potential state of urban groundwater flow: example of Lyon, France

Abstract : Underground structures have been shown to have a great influence on subsoil resources in urban aquifers. A methodology to assess the actual and the potential state of the groundwater flow in an urban area is proposed. The study develops a three-dimensional modeling approach to understand the cumulative impacts of underground infrastructures on urban groundwater flow, using a case in the city of Lyon (France). All known underground structures were integrated in the numerical model. Several simulations were run: the actual state of groundwater flow, the potential state of ground- water flow (without underground structures), an intermediate state (without impervious structures), and a transient simulation of the actual state of groundwater flow. The results show that underground structures fragment groundwater flow systems leading to a modification of the aquifer regime. For the case studied, the flow systems are shown to be stable over time with a transient simulation. Structures with drainage sys- tems are shown to have a major impact on flow systems. The barrier effect of impervious structures was negligible because of the small hydraulic gradient of the area. The study demon- strates that the definition of a potential urban groundwater flow and the depiction of urban flow systems, which involves understanding the impact of underground structures, are im- portant issues with respect to urban underground planning.
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https://hal-sde.archives-ouvertes.fr/hal-01369493
Contributor : Nathalie Lyvet Connect in order to contact the contributor
Submitted on : Wednesday, September 21, 2016 - 10:14:51 AM
Last modification on : Tuesday, May 24, 2022 - 1:34:02 PM

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Guillaume Attard, Yvan Rossier, Thierry Winiarski, Loann Cuvillier, Laurent Eisenlohr. Deterministic modelling of the cumulative impacts of underground structures on urban groundwater flow and the definition of a potential state of urban groundwater flow: example of Lyon, France. Hydrogeology Journal, Springer Verlag, 2016, 24, pp.1213-1229. ⟨10.1007/s10040-016-1385-z⟩. ⟨hal-01369493⟩

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