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

Attard, Guillaume; Rossier, Yvan; Winiarski, Thierry; Cuvillier, Loann; Eisenlohr, Laurent

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 | Modélisation déterministe des impacts cumulés des structures souterraines sur l’écoulement des eaux souterraines en milieu urbain et définition d’un état potentiel de l’écoulement des eaux souterraines en milieu urbain: exemple de Lyon, France Modelo determinístico de los impactos acumulativos de las estructuras del subsuelo sobre el flujo del agua subterránea urbana y la definición de un estado potencial del flujo de agua subterránea urbana: ejemplo de Lyon, Francia 地下建筑物对城市地下水流的累积影响确定性模拟及城市地下水流潜在状态的定义:法国里昂的研究实例 Modelagem determinística dos impactos cumulativos de estruturas subterrâneas sobre o escoamento de água subterrânea urbana e a definição de uma situação potencial do escoamento de água subterrânea urbana: exemplo de Lyon, França

2016

Attard, Guillaume | Rossier, Yvan | Winiarski, Thierry | Cuvillier, Loann | Eisenlohr, Laurent

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 groundwater 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 systems 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 demonstrates 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 important issues with respect to urban underground planning.

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