NDLI: Contribution of time-related environmental tracing combined with tracer tests for characterization of a groundwater conceptual model: a case study at the Séchilienne landslide, western Alps (France)

Content Provider	Springer Nature Link
Author	Vallet, A. Bertrand, C. Mudry, J. Bogaard, T. Fabbri, O. Baudement, C. Régent, B.
Copyright Year	2015
Abstract	Groundwater-level rise plays an important role in the activation or reactivation of deep-seated landslides and so hydromechanical studies require a good knowledge of groundwater flows. Anisotropic and heterogeneous media combined with landslide deformation make classical hydrogeological investigations difficult. Hydrogeological investigations have recently focused on indirect hydrochemistry methods. This study aims at determining the groundwater conceptual model of the Séchilienne landslide and its hosting massif in the western Alps (France). The hydrogeological investigation is streamlined by combining three approaches: a one-time multi-tracer test survey during high-flow periods, a seasonal monitoring of the water stable-isotope content and electrical conductivity, and a hydrochemical survey during low-flow periods. The complexity of the hydrogeological setting of the Séchilienne massif leads to development of an original method to estimate the elevations of the spring recharge areas, based on topographical analyses and water stable-isotope contents of springs and precipitation. This study shows that the massif supporting the Séchilienne landslide is characterized by a dual-permeability behaviour typical of fractured-rock aquifers where conductive fractures play a major role in the drainage. There is a permeability contrast between the unstable zone and the intact rock mass supporting the landslide. This contrast leads to the definition of a shallow perched aquifer in the unstable zone and a deep aquifer in the intact massif hosting the landslide. The perched aquifer in the landslide is temporary, mainly discontinuous, and its extent and connectivity fluctuate according to the seasonal recharge.L’élévation du niveau de l’eau souterraine joue un rôle important dans l’activation ou la réactivation des glissements de terrain profonds et ainsi des études hydromécaniques nécessitent une bonne connaissance des écoulements d’eaux souterraines. Les milieux anisotropes et hétérogènes combinés à une déformation des glissements de terrain rendent les études hydrogéologiques classiques difficiles. Des études hydrogéologiques ont récemment mis l’accent sur les méthodes hydrochimiques indirectes. Cette étude vise à déterminer le modèle conceptuel hydrogéologique du glissement de terrain de la Séchilienne et son massif dans les Alpes occidentales (France). L’étude hydrogéologique est rationalisée en combinant trois approches: une campagne unique d’essais de traçage multi-traceur au cours des périodes de hautes eaux, un suivi saisonnier de la teneur en isotope stable de l’eau et de la conductivité électrique, et une campagne hydrochimique au cours des périodes de bases eaux. La complexité du contexte hydrogéologique du massif de la Séchilienne mène à développer une méthode originale pour estimer les altitudes des zones de recharge des sources, basée sur des analyses topographiques et sur la teneur des isotopes stables de l’eau des sources et des précipitations. Cette étude montre que le massif siège du glissement de terrain de la Séchilienne est caractérisé par comportement à double perméabilité typique des aquifères fissurés où les fractures conductrices jouent un rôle majeur dans le drainage. Il y a un contraste de conductivité hydraulique entre la zone instable et la masse rocheuse intacte sous-jacent du glissement de terrain. Ce contraste conduit à la définition d’un aquifère perché peu profond dans la zone instable et un aquifère profond dans le massif intact siège du glissement de terrain. L’aquifère perché au sein du glissement de terrain est temporaire, essentiellement discontinu, et son extension et la connectivité fluctuent en fonction de la recharge saisonnière.El ascenso del nivel de agua subterránea juega un papel importante en la activación o reactivación de deslizamientos de tierra profundos y por lo tanto los estudios hidromecánicos requieren de un buen conocimiento de los flujos de agua subterránea. Los medios anisotrópicos y heterogéneos asociados a la deformación por el deslizamiento de tierra hacen dificultosas las investigaciones hidrogeológicas clásicas. Las investigaciones hidrogeológicas recientemente se han centrado en métodos hidroquímicos indirectos. Este estudio tiene como objetivo determinar el modelo conceptual del agua subterránea en el deslizamiento de tierra en Séchilienne y en el macizo hospedante en los Alpes occidentales (Francia). La investigación hidrogeológica se hace más eficiente mediante la combinación de tres enfoques: una relevamiento de pruebas de multitrazadores por única vez durante los períodos de alto flujo, un monitoreo estacional del contenido de isótopos estables y de la conductividad eléctrica en el agua, y un relevamiento hidroquímico durante los períodos de bajo flujo. La complejidad del entorno hidrogeológico del macizo de Séchilienne conduce al desarrollo de un método original para calcular las elevaciones de las áreas de recarga de los manantiales, basada en análisis topográficos y contenidos de isótopos estable del agua de los manantiales y de la precipitación. Este estudio muestra que el macizo hospedante del deslizamiento de tierra de Séchilienne se caracteriza por una doble permeabilidad, comportamiento típico de los acuíferos en rocas fracturadas, donde los conductos de las fracturas desempeñan un papel importante en el drenaje. Existe un contraste de permeabilidad entre la zona inestable y el macizo de roca intacta donde se apoya el deslizamiento de tierra. Este contraste conduce a la definición de un acuífero superficial colgado en la zona inestable y un acuífero profundo en el macizo de roca intacta que aloja el deslizamiento de tierra. El acuífero colgado en el deslizamiento de tierra es temporario, mayormente discontinuo, y su alcance y conectividad fluctúa de acuerdo a la recarga estacional.地下水位上升在深层滑坡的激活或者再激活过程中发挥着重要作用,因此,流体力学研究需要彻底了解地下水水流。各向异性和非均质介质加上滑坡变形使传统的水文地质调查非常困难。最近的水文地质调查主要集中在间接的水文化学方法上。这项研究目的就是确定(法国)阿尔卑斯山脉西部Séchilienne滑坡及其主要地块的地下水概念模型。通过三种方法结合起来使水文地质调查更加合理:高水流期一次性的多示踪剂实验调查,水中稳定同位素含量和电导率季节性监测及低水流期的水化学调查。Séchilienne地块水文地质背景的复杂性致使原来的方法得到进一步开发,根据地形分析和泉水和降水中的稳定同位素含量估算泉补给区的海拔高度。这项研究显示,支撑Séchilienne滑坡的地块呈现出双重渗透性行为特征,这种行为是断裂岩层含水层的典型特征,在这种含水层中,传导断裂在排水中发挥着主要作用。非稳定带和支撑滑坡的完整岩石块之间有渗透性差异。依据这种差异可以区分出非稳定带中的浅的表层含水层和支撑滑坡的完整地块中深层含水层。滑坡中的表层含水层是暂时的、大体上不连续的,其范围和连通性根据季节补给量波动。A elevação do nível da água subterrânea desempenha um papel importante na ativação ou reativação de deslizamentos em profundidade, de modo que estudos hidromecânicos exigem um bom entendimento sobre os fluxos da água subterrânea. A combinação de meios heterogêneos e anisotrópicos com a deformação gerada por deslizamentos dificulta as investigações ambientais convencionais. Recentemente, investigações hidrogeológicas têm focado em métodos hidrogeoquímicos indiretos. O presente estudo visa à determinação do modelo conceitual de águas subterrâneas do deslizamento de Séchilienne e seu maciço hospedeiro no oeste alpino (França). A investigação hidrogeológica é organizada por meio da combinação de três métodos: teste de multi-traçador em único evento durante os períodos de alto fluxo; monitoramento sazonal do conteúdo de isótopos e condutividade elétrica da água; e levantamento hidroquímico durante períodos de baixo fluxo. A complexidade do contexto hidrogeológico do maciço Séchilienne motiva o desenvolvimento de um novo método para estimar as elevações das áreas de recarga das nascentes, baseada na análise topográfica e conteúdo de isótopos estáveis nas águas das nascentes e das chuvas. O presente estudo mostra que o maciço hospedeiro do deslizamento de Séchilienne é caracterizado pelo comportamento de dupla permeabilidade, típico de aquíferos em rocha fraturada onde as fraturas desempenham papel principal na drenagem. Entre a zona instável e a rocha sã do maciço subjacente ao deslizamento há um contraste de permeabilidade. Tal contraste motiva a definição de um aquífero suspenso raso na zona instável e a um aquífero mais profundo na rocha sã do maciço hospedeiro do deslizamento. O aquífero suspenso no deslizamento é temporário, predominantemente descontínuo, e sua extensão e conectividade varia conforme a sazonalidade da recarga.
Starting Page	1761
Ending Page	1779
Page Count	19
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	23
Issue Number	8
e-ISSN	14350157
Language	Portuguese
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-08-09
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Conceptual models Tracer tests Hydrochemistry Landslide France Hydrogeology Hydrology/Water Resources Geology Water Quality/Water Pollution Geophysics/Geodesy Waste Water Technology Water Pollution Control Water Management Aquatic Pollution
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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