NDLI: The role of porous matrix in water flow regulation within a karst unsaturated zone: an integrated hydrogeophysical approach

Content Provider	Springer Nature Link
Author	Carrière, Simon D. Chalikakis, Konstantis Danquigny, Charles Davi, Hendrik Mazzilli, Naomi Ollivier, Chloé Emblanch, Christophe
Copyright Year	2016
Abstract	Some portions of the porous rock matrix in the karst unsaturated zone (UZ) can contain large volumes of water and play a major role in water flow regulation. The essential results are presented of a local-scale study conducted in 2011 and 2012 above the Low Noise Underground Laboratory (LSBB – Laboratoire Souterrain à Bas Bruit) at Rustrel, southeastern France. Previous research revealed the geological structure and water-related features of the study site and illustrated the feasibility of specific hydrogeophysical measurements. In this study, the focus is on hydrodynamics at the seasonal and event timescales. Magnetic resonance sounding (MRS) measured a high water content (more than 10 %) in a large volume of rock. This large volume of water cannot be stored in fractures and conduits within the UZ. MRS was also used to measure the seasonal variation of water stored in the karst UZ. A process-based model was developed to simulate the effect of vegetation on groundwater recharge dynamics. In addition, electrical resistivity tomography (ERT) monitoring was used to assess preferential water pathways during a rain event. This study demonstrates the major influence of water flow within the porous rock matrix on the UZ hydrogeological functioning at both the local (LSBB) and regional (Fontaine de Vaucluse) scales. By taking into account the role of the porous matrix in water flow regulation, these findings may significantly improve karst groundwater hydrodynamic modelling, exploitation, and sustainable management.Certaines parties de la matrice rocheuse poreuse de la zone non saturée karstique (ZNS) peut renfermer de grands volumes d’eau et jouer un rôle important dans la régulation du flux hydrique. Les résultats essentiels sont issus d’une étude menée à l’échelle locale en 2011 et 2012 au-dessus du Laboratoire Souterrain à Bas Bruit (LSBB) à Rustrel, Sud Est de la France. Des recherches antérieures ont révélé la structure géologique et les caractéristiques liées à l’eau du site d’étude et illustré la faisabilité de mesures hydrogéophysiques spécifiques. Dans cette étude, l’accent est mis sur l’hydrodynamique aux échelles temporelles saisonnières et événementielles. Un sondage par résonnance magnétique (MRS) a mesuré une teneur en eau élevée (plus de 10 %) dans un grand volume de roche. Ce grand volume d’eau ne peut pas être stocké dans les fractures et les conduits au sein de la ZNS. La MRS a également été utilisée pour mesurer la variation saisonnière de l’eau stockée dans la ZNS du karst. Un modèle basé sur les processus a été développé pour simuler l’effet de la végétation sur les dynamiques de recharge des eaux souterraines. De plus, une surveillance par tomographie de résistivité électrique (ERT) a été utilisée pour évaluer les cheminements préférentiels de l’eau au cours d’un événement de pluie. Cette étude démontre l’influence principale de l’écoulement de l’eau au sein d’une matrice rocheuse poreuse sur le fonctionnement hydrogéologique de la ZNS aussi bien à l’échelle locale (LSBB) qu’à l’échelle régionale (Fontaine de Vaucluse). En prenant en compte le rôle de la matrice poreuse dans la régulation du flux hydrique, ces résultats peuvent améliorer de manière significative la modélisation hydrodynamique des écoulements souterrains en milieu karstique, l’exploitation, et la gestion durable.Algunas partes de la matriz porosa de una roca kárstica en la zona no saturada (UZ) pueden contener grandes cantidades de agua y jugar un papel importante en la regulación del flujo de agua. Se presentan los principales resultados de un estudio a escala local, llevado a cabo en 2011 y 2012 por encima del Low Noise Underground Laboratory (LSBB – Laboratoire Souterrain à Bas Bruit) en Rustrel, en el sureste de Francia. Las investigaciones previas revelaron la estructura geológica y las características relacionadas con el agua en la zona de estudio e ilustraron acerca de la viabilidad de mediciones hidrogeofísicas específicas. En este estudio, la atención se centra en la hidrodinámica a escalas de tiempo estacionales y de eventos. Los sondeos de resonancia magnética (MRS) midieron un alto contenido de agua (más de un 10 %) en un volumen importante de la roca. Este volumen importante de agua no se puede almacenar en las fracturas y conductos dentro de la UZ. Los MRS también se utilizaron para medir la variación estacional de agua almacenada en la UZ del karst. Se desarrolló un modelo basado en los procesos para simular el efecto de la vegetación sobre la dinámica de la recarga del agua subterránea. Además, se utilizó el monitoreo de tomografías de resistividad eléctrica (ERT) para evaluar las vías preferenciales del agua durante un evento de lluvia. Este estudio demuestra la influencia principal del flujo de agua dentro de la matriz de la roca porosa sobre el funcionamiento hidrológico de la UZ, tanto en la escala local (LSBB) como en la regional (Fontaine de Vaucluse). Al tomar en cuenta el papel de la matriz porosa en la regulación del flujo de agua, estos resultados pueden mejorar significativamente el modelado, la hidrodinámica, la explotación y gestión sostenible del agua subterránea en el karst.岩溶非饱和带中,部分多孔岩石基体可包含大量的水兵在水流调解中发挥主要作用。这里展示了2011年和2012年在法国东南部吕斯特勒低噪音地下实验室之上进行的局部尺度研究的基本结果。过去的研究揭示了研究区的地质构造和与水相关的特征,描述了特定水文地球物理测量方法的可能性。在本研究中,重点集中在季节和事件时间标度上水动力学。磁共振测得大体积岩石中有很高的含水量(大于10%)。如此大量的水不能储存在非饱和带内的断裂和管道中。磁共振还用于测量储存在岩溶非饱和带内的水的季节性变化。建立了基于过程的模型,来模拟植被对地下水补给动力学的影响。另外,利用电阻率层析成像监测评价了降雨事件期间的优先水通道。本研究展示了局部尺度(低噪音地下实验室)和局域尺度(Fontaine de Vaucluse)多孔岩石基体内水流对非饱和带水文地质机能的主要影响。考虑到多孔基体在水流调解中的作用,这些发现可大大改进岩溶地下水的水动力学模拟、开发和可持续管理。Algumas porções da matriz porosa da rocha em zona não saturada (ZNS) cárstica podem conter grandes volumes de água e desempenhar um importante papel na regulação do fluxo de água. São apresentados os resultados essenciais de um estudo de escala-local realizado em 2011 e 2012 acima do Laboratório Subterrâneo de Baixo Ruído (LSBB – Laboratoire Souterrain à Bas Bruit) em Rustrel, sudeste da França. Pesquisas anteriores revelaram a estrutura geológica e as características relacionadas da água no local de estudo e ilustraram a possibilidade de medições hidrogeofísicas específicas. Neste estudo, o foco está nas hidrodinâmicas nas escalas de tempos sazonal e de evento. Sondagem de ressonância magnética (SRM) mediu um teor alto de água (mais de 10 %) em um grande volume de rocha. Esse grande volume de água não pode ser armazenado em fraturas e condutos dentro da ZNS. A SRM foi também usada para medir a variação sazonal da água armazenada na ZNS cárstica. Um modelo de processo-básico foi desenvolvido para simular o efeito da vegetação nas dinâmicas da recarga da água subterrânea. Além disso, o monitoramento de tomografia de resistividade elétrica (TRE) foi utilizado para avaliar caminhos preferenciais de água durante um evento de chuva. Esse estudo demonstra a maior influência do fluxo de água dentro da matriz porosa da rocha sobre o funcionamento hidrogeológico da ZNS tanto nas escalas local (LSBB) quanto na regional (Fontaine de Vaucluse). Tendo em conta o papel da matriz porosa na regulação do fluxo da água, estes resultados podem melhorar significantemente a modelagem da hidrodinâmica cárstica da água subterrânea, a explotação e o gerenciamento sustentável.
Starting Page	1905
Ending Page	1918
Page Count	14
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	24
Issue Number	7
e-ISSN	14350157
Language	Portuguese
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-05-07
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Karst France Hydrogeophysics Carbonate rocks Matrix porosity 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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