| Titre | Comparison of slug and pumping tests for hydraulic tomography experiments: a practical perspective |
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| Auteur | Paradis, D ;
Lefebvre, R; Gloaguen, E; Giroux, B |
| Source | NovCare - novel methods for subsurface characterization and monitoring: from theory to practice; Environmental Earth Sciences vol. 75, issue 16, 1159, 2016 p. 1-13, https://doi.org/10.1007/s12665-016-5935-4  Accès
ouvert |
| Année | 2016 |
| Séries alt. | Secteur des sciences de la Terre, Contribution externe 20150440 |
| Éditeur | Springer Nature |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1007/s12665-016-5935-4 |
| Media | papier; en ligne; numérique |
| Formats | pdf (Adobe® Reader®); html; docx (Microsoft® Word®) |
| Sujets | ressources en eau souterraine; aquifères; analyses hydrauliques; essais de pompage; modèles; conductivité hydraulique; charge hydraulique; Méthodologie; hydrogéologie |
| Illustrations | organigrammes; modèles 3D; représentations schématiques; profils; graphiques; tableaux |
| Programme | Géoscience des eaux souterraines Caractéristiques d'aquifères et support cartographique |
| Diffusé | 2016 08 11 |
| Résumé | (disponible en anglais seulement)
Hydraulic tomography is the simultaneous analysis of several hydraulic tests performed in multiple isolated intervals in adjacent wells to image heterogeneous
hydraulic property fields. In this study, we compare the resolutions associated with hydraulic tomography experiments carried out with slug tests and pumping tests for simple configurations with hydraulic property values representative of an
extensively studied littoral aquifer. Associated test designs (e.g., pumping rates, test durations) and the validity of the principle of reciprocity are also assessed. For this purpose, synthetic tomography experiments and their associated
sensitivity matrices are generated using a radial flow model accounting for wellbore storage. The resolution analysis is based on a pseudo-inverse analysis of the sensitivity matrix with a noise level representative of field measurements. Synthetic
experiments used equivalent perturbations for slug tests and pumping tests. Even though pumping tests induce a drawdown in observation intervals that is three times larger than head changes due to slug tests, resolutions for hydraulic conductivities
(horizontal and vertical) are similar for the two tests and slightly lower for specific storage with pumping. However, experiments with pumping require fifty times more water and are seven times longer to perform than experiments with slug tests.
Furthermore, reducing pumping rates to limit disposal of water or test durations to decrease field data acquisition time would considerably lower resolutions for either scenario. Analyses are done using all available stressed and observation
intervals as required by the non-applicability of the principle of reciprocity for slug tests and pumping tests with important wellbore storage. This study demonstrates concepts that have important implications for the performance and analysis of
hydraulic tomography experiments. |
| Sommaire | (Résumé en langage clair et simple, non publié)
Cet article est le troisième d'une série de trois article sur la tomographie hydraulique. La tomographie hydraulique est similaire en principe à
l'imagerie médicale et vise à imager l'architecture des matériaux géologiques composant les systèmes aquifères contenant l'eau souterraine. En particulier, la tomographie permet de reconnaître les barrières et les chemins préférentiels de
l'écoulement de l'eau souterraine ou du transport des contaminants dissous par la réalisation de différents tests spécialisés dans des puits. La tomographie hydraulique est une technique qui connait actuellement un engouement dans la communauté
scientifique à cause des nouvelles possibilités offertes, et la série d'articles vise à explorer ces nouvelles possibilités. Ce troisième article explore une de ces possibilités, en particulier l'impact du type de test utilisé pour la tomographie sur
la résolution de l'architecture des systèmes aquifères. |
| GEOSCAN ID | 297654 |
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