Spatial organization of the impulse response in a karst aquifer
| Autor: | Florent Barbecot, L. Couchoux, C. Delbart, Antoine Tognelli, Danièle Valdes |
|---|---|
| Přispěvatelé: | DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Géosciences Paris Sud (GEOPS), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Milieux Environnementaux, Transferts et Interactions dans les hydrosystèmes et les Sols (METIS), Université Pierre et Marie Curie - Paris 6 (UPMC)-École Pratique des Hautes Études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Université du Québec à Montréal = University of Québec in Montréal (UQAM), Centre National de la Recherche Scientifique (CNRS)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC) |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
geography
geography.geographical_feature_category 010504 meteorology & atmospheric sciences Groundwater flow 0208 environmental biotechnology Borehole Aquifer 02 engineering and technology 01 natural sciences 6. Clean water 020801 environmental engineering Water level Aquifer test [SDU]Sciences of the Universe [physics] Vadose zone Spatial variability Geomorphology Groundwater Geology 0105 earth and related environmental sciences Water Science and Technology |
| Zdroj: | Journal of Hydrology Journal of Hydrology, 2016, 537, pp.18-26. ⟨10.1016/j.jhydrol.2016.03.029⟩ Journal of Hydrology, Elsevier, 2016, 537, pp.18-26. ⟨10.1016/j.jhydrol.2016.03.029⟩ |
| ISSN: | 0022-1694 |
| DOI: | 10.1016/j.jhydrol.2016.03.029⟩ |
| Popis: | International audience; Karst aquifers are characterized by a strong heterogeneity in their physical properties. The purpose of the study is the spatial variability of water transfers in a carbonated karstic aquifer. To this end, a high spatial density of information about the water transfer is needed. The characteristics of the site, a topographic hill of 13 km2 with eight boreholes, which was monitored hourly over four years, allows the study of the spatial variability of water transfers. The variability of the impulse response of the system is studied using autocorrelation and cross-correlation analysis between the rainfall and piezometric level time series. The shapes of the autocorrelation and cross-correlation functions vary according to the geographical location of the boreholes, that proves a spatial organization of the groundwater transfer. The response time varies depending on the thickness of the unsaturated zone by an unusual inverse correlation. In this case, the water level signal spatially integrates the signal transfer of the unsaturated zone and the signal transfer of the saturated part of the aquifer. Consequently, inertia and response time increased with the distance between the borehole and the top of piezometric dome. This description supports highly organized fast transfers in this karst aquifer and a highly connected fracture network. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect