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Avignon, France

Carriere S.D.,UMR1114 EMMAH | Carriere S.D.,French National Institute for Agricultural Research | Chalikakis K.,UMR1114 EMMAH | Chalikakis K.,French National Institute for Agricultural Research | And 5 more authors.
Environmental Earth Sciences | Year: 2015

The common hydrogeological concepts assume that water enters in karst media by preferential pathways. But it is difficult to identify these pathways, particularly if soil or scree covers the karst features. When and where does water enter in the hydrosystem? How fast? A unique large-scale Electrical Resistivity Tomography (ERT) surface-based time-lapse experiment was carried out during a typical Mediterranean autumn rainy episode (230 mm of rain over 17 days). A total of 120 ERT time-lapse sections were measured over the same profile during and after this event (30 days). The main goal was to evaluate efficiency and limits of the ERT to monitor water infiltration, under natural conditions. Apparent (directly measured) and inverted resistivity’s variation during the rainy event highlights some interesting zones. They could be interpreted as preferential pathways, where water dynamic seems quicker in term of moistening and drainage. Nevertheless, these results have to be interpreted reasonably because ERT does not provide enough precision to determine exact pathways geometry and functioning. In addition, forward modeling provided relevant data treatment limitations mainly for the deeper parts of the sections. © Springer-Verlag Berlin Heidelberg 2015. Source


Ollivier C.,UMR1114 EMMAH | Ollivier C.,French National Institute for Agricultural Research | Danquigny C.,UMR1114 EMMAH | Danquigny C.,French National Institute for Agricultural Research | And 4 more authors.
Environmental Earth Sciences | Year: 2015

Characterising the hydrodynamic processes in the unsaturated zone is a prerequisite to efficiently protect and manage the karst water resource. In this study, we use rainfall-discharge cross-correlation analysis to improving the understanding of the hydrodynamic functioning of the karst unsaturated zone. This analysis is based on sparse discharge measurements from five flow points located within the artificial LSBB gallery. Our results are consistent with hydrochemical analyses, and they evidence the influence of inter-annual rainfall variability on the hydrological functioning of the unsaturated zone. They also show that cross-correlation may prove an efficient tool for sparse data analyses. © Springer-Verlag Berlin Heidelberg 2015. Source

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