Stratigraphic and structural controls on groundwater flow in an outcropping fossil fan delta: the case of Sant Llorenç del Munt range (NE Spain)

Anglés, Marc; Folch, Albert; Oms, Oriol; Maestro, Eudald; Mas-Pla, Josep

Stratigraphic and structural controls on groundwater flow in an outcropping fossil fan delta: the case of Sant Llorenç del Munt range (NE Spain) | Contrôles stratigraphiques et structuraux sur les écoulements d’eau souterraine dans un éventail deltaïque fossile: le cas du massif de Sant Llorenç del Munt (Nord-est. de l’Espagne) Controles estratigráficos y estructurales en el flujo de agua subterránea de un abanico deltaico fósil: el caso del macizo de Sant Llorenç del Munt (NE de España) 出露地表的化石扇形三角洲地层和构造对地下水流的影响:(西班牙东北部)Sant Llorenç del Munt range的研究案例 Controle estrutural e estratigráfico do fluxo das águas subterrâneas em um afloramento fóssil de um delta em leque: o caso de Sant Llorenç del Munt (NE Espanha)

2017

Anglés, Marc | Folch, Albert | Oms, Oriol | Maestro, Eudald | Mas-Pla, Josep

Hydrogeological models of mountain regions present the opportunity to understand the role of geological factors on groundwater resources. The effects of sedimentary facies and fracture distribution on groundwater flow and resource exploitation are studied in the ancient fan delta of Sant Llorenç de Munt (central Catalonia, Spain) by integrating geological field observations (using sequence stratigraphy methods) and hydrogeological data (pumping tests, hydrochemistry and environmental isotopes). A comprehensive analysis of data portrays the massif as a single unit, constituted by different compartments determined by specific layers and sets of fractures. Two distinct flow systems—local and regional—are identified based on pumping test analysis as well as hydrochemical and isotopic data. Drawdown curves derived from pumping tests indicate that the behavior of the saturated layers, whose main porosity is given by the fracture network, corresponds to a confined aquifer. Pumping tests also reflect a double porosity within the system and the occurrence of impervious boundaries that support a compartmentalized model for the whole aquifer system. Hydrochemical data and associated spatial evolution show the result of water–rock interaction along the flow lines. Concentration of magnesium, derived from dolomite dissolution, is a tracer of the flow-path along distinct stratigraphic units. Water stable isotopes indicate that evaporation (near a 5% loss) occurs in a thick unsaturated zone within the massif before infiltration reaches the water table. The hydrogeological analysis of this outcropping system provides a methodology for the conceptualization of groundwater flow in similar buried systems where logging and hydrogeological information are scarce.

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