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Auteur Malard, A.; Jeannin, P.-Y.; Rickerl, D.
Titre Impact of a Tunnel on a Karst Aquifer: Application on the Brunnmühle Springs (Bernese Jura,Switzerland) Type Book Chapter
Année 2015 Publication Hydrogeological and environmental investigations in karst systems. Environmental Earth Sciences Revue Abrégée
Volume Numéro Pages 457-463
Mots-Clés KarstALEA
Résumé Tunnel drilling in karst regions often leads to major disturbances in the hydrogeological functioning of

aquifers and flow-systems. Numerous examples in Switzerland do exist and induced significant costs,

which were not or rarely anticipated (e.g.: Flims, Jeannin et al. 2009). The Ligerztunnel is one such

example. The tunnel was built a few hundreds of meters upstream from the Brunnmühle spring, which

contributes to the drinking water supply of communities of Twann and Ligerz. During the construction, a

major karst conduit with a huge discharge rate was intersected in a side exploration tunnel. Overflowing

water was diverted in the Twannbach canyon. In the main section, smaller conduits were found and

drained outside by pipe leading water close to the Brunnmühle spring. Actually, authorities want to add a

safety gallery parallel to the main tunnel. In this view, SISKA is in charge of evaluating the hydrological

disturbances on the spring regime. The paper presents the approach applied to assess the potential effect of

the drilling of a new tunnel near to a group of karst springs and pumping wells. The approach combines

available spatial information and a hydraulic model. The KARSYS approach is first applied on the system

in order to set up a 3D geological and hydrogeological model of the karst aquifer and the related systems.

The spatial distribution of karst conduits within the massif is assessed based on a speleogenetical and

inception horizons model (KarstALEA method). Inferring from these models, a karst conduits network is

generated. The downstream part of the conduits network, which concerns the vicinity of the tunnels

project, is precisely calibrated using head and discharge data. Flow in this conduits network is then

simulated using SWMM 5.0 in order to reproduce the hydrological responses of the different outlets

(permanent springs, drainage devices, overflow springs, etc.).
Auteur institutionnel Thèse
Editeur Springer Lieu de Publication (down) Éditeur
Langue Langue du Résumé Titre Original
Éditeur de collection B. Andreo et al. Titre de collection Titre de collection Abrégé
Volume de collection Numéro de collection Edition
Région Expédition Conférence
Notes DOI 10.1007/978-3-642-17435-3_52 Approuvé no
Numéro d'Appel refbase @ user @ collection 124
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