Présentations Colloques

    Flash Poster
    8.09
    Session 8.09: Hydrogeoecology: a focus on groundwater ecology
    Menció (orateur)
    Using stygofauna assemblages to analyze groundwater recharge effects in the Llobregat River Alluvial aquifer
    The Barcelona Metropolitan Area is recurrently facing periods of severe water scarcity and is reliant on water transfers from nearby basins to meet demand. Local Llobregat delta groundwater resources are severally affected by seawater intrusion, limiting their use as a complementary water supply. In order to improve the aquifer resources, Managed Aquifer Recharge (MAR) solutions, such as infiltration ponds, and Aquifer Storage and Recovery (ASR) facilities, have been established near the Drinking Water Treatment Plant of Sant Joan Despí. However, this ASR system is presently inoperative due to the high water production costs and the unsustainability of the ASR scheme for producing potable water.**In this context, DESSIN project aims at make flexible the existing ASR deep injection system using pre-potable water. To assess the ecological effects of groundwater recharge in the Llobregat aquifer, an analysis of stygofauna assemblages, as indicator of ecological quality, together with the aquifer hydrochemistry has been conducted. In 2015, a total of nine boreholes were sampled- four of them representative of natural conditions of the aquifer+ three were located near the infiltration pond (not operating during the sampling period)+ and two observation bores of the ASR injection well (sampled during the injection period). **Preliminary results show significant differences among these three bore groups. The richness and abundances of stygofauna were higher in those bores influenced by the infiltration ponds, compared to those bores representing natural conditions of the aquifer. However, those located close to the ASR deep injection system showed the lowest values. These differences show the potential effect of MAR on stygofauna assemblages, which could modify groundwater ecosystem characteristics (e.g. temperature, pressure). Further research is presently oriented to assess temporal evolution as a criterion for the suitability of such management practices.****This study has been funded by the European Project Demonstrate Ecosystem Services Enabling Innovation (DESSIN-619039), and the University of Girona project MPCUdG2016 061**
    Spain

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