NDLI: Surface water/groundwater interaction in the Piora Aquifer, Switzerland: evidence from dye tracing tests

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Hydrogeology Journal : Volume 11, Issue 1, February 2003

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Surface water/groundwater interaction in the Piora Aquifer, Switzerland: evidence from dye tracing tests

Content Provider	Springer Nature Link
Author	Otz, Martin H. Otz, Heinz K. Otz, Ines Siegel, Donald I.
Copyright Year	2003
Abstract	Results of seven dye tracing tests done from 1993–1997 to investigate the extent to which lakes and surface water interact with the underlying Triassic Piora Aquifer, Switzerland, are reported here. Two of the dye tracing tests showed that groundwater flows in the Piora Aquifer from the Piora Valley to springs in the adjacent Santa Maria Valley, and even further east to the di Campo Valley considerably outside of the Piora Valley surface water divide.Lake Ritom located in the Piora Valley loses water only to the Canaria Valley outside of the lake's surface-water watershed at the lake's western margin when lake levels are above 1,835 m above sea level. Dye tracing tests show that a major sinkhole in the Piora Valley, Calderoni Sinkhole, is located precisely on the water divide where subsurface flow in the Piora Valley and surface water diverge and move in opposite directions. The dye tracing results also showed no hydraulic connection between surface water in the Piora Valley and the famous Pertusio Spring, located in the upper Santa Maria Valley. Only a small amount of dye from the two dye tracing tests done in 1993 and 1997 entered an exploratory gallery built to test the viability of the AlpTransit tunnel, being built in competent rock under the Triassic Piora Aquifer, effectively perched above.Cet article présente les résultats de sept essais de traçage réalisés entre 1993 et 1997 pour étudier l'étendue sur laquelle les lacs et les eaux de surface interagissent avec l'aquifère triasique sous-jacent de Piora (Suisse). Deux des essais de traçage ont montré que les eaux souterraines s'écoulent de la vallée de Piora vers des sources de la vallée voisine de Santa Maria, et même plus à l'est vers la vallée Di Campo, bien au-delà de la limite du bassin superficiel de la vallée de Piora.Le lac Ritom, situé dans la vallée de Piora, perd de l'eau uniquement vers la vallée de Canaria, hors du bassin versant du lac, sur la rive ouest du lac, lorsque les niveaux du lac sont supérieurs à l'altitude 1835 m. Des essais de traçage montrent qu'une perte majeure dans la vallée de Piora, la perte de Calderoni, est située exactement sur la limite de partage des eaux où l'écoulement souterrain dans la vallée de Piora et les eaux de surface divergent et coulent dans des directions opposées. Les résultats des traçages montrent également qu'il n'existe pas de connexion hydraulique entre les eaux de surface de la vallée de Piora et la fameuse source Pertusio, située dans la haute vallée de Santa Maria, et que seulement une petite quantité de traceur des deux traçages faits en 1993 et 1997 parvient dans une galerie d'exploration percée pour tester la faisabilité du tunnel transalpin, creusé dans des roches compétentes sous l'aquifère triasique de Piora, perché au-dessus.Se informa en el presenta artículo de los resultados obtenidos a partir de la ejecución de siete ensayos de trazadores con colorantes entre 1993 y 1997, con el fin de investigar la interacción entre las aguas superficiales y los lagos con el acuífero Triásico de Piora (Suiza). Dos de los ensayos mostraron que las aguas subterráneas fluyen en el acuífero desde el Valle de Piora hasta los manantiales situados en el valle contiguo de Santa María,; incluso, descargan más hacia el Este, en el Valle di Campo, situado a una distancia considerable de la divisoria del Valle de Piora. El Lago Ritom, ubicado en este Valle, sólo infiltra agua al Valle de Canaria, que se halla fuera de la cuenca superficial del propio lago—en el margen occidental—cuando los niveles del lago están por encima de la cota 1.835 m. Los ensayos de trazadores muestran que existe un sumidero principal en el Valle de Piora, denominado Calderón, precisamente en la divisoria de aguas, donde el flujo subsuperficial del Valle de Piora y las aguas superficiales divergen y se mueven en sentidos opuestos. Los resultados también confirman la ausencia de conexión hidráulica entre las aguas superficiales del Valle de Piora y el famoso manantial de Pertusio, que está en la parte alta del Valle de Santa María. Además, sólo una pequeña cantidad del colorante utilizado en los dos ensayos realizados en 1993 y en 1997 penetró en la galería exploratoria construida para comprobar la viabilidad del túnel AlpTransit, perforado en roca competente bajo el acuífero Triásico de Piora, el cual se comporta como un nivel colgado.
Starting Page	228
Ending Page	239
Page Count	12
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	11
Issue Number	2
e-ISSN	14350157
Language	English
Publisher	Springer-Verlag
Publisher Date	2003-01-23
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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