Ici, un tracé de diagnostic de la dérivé du rabattement selon une échelle logarithmique est utilisé pour identifier les régimes d’écoulement et donc les hétérogénéités de l’aquifère, conduisant à des modèles conceptuels plausibles. Cependant, l’ajustement des données peut échouer et fournir seulement une indication relative à la complexité de la structure de l’aquifère sollicité par pompage. L’étude des ressources en eau souterraine à partir de données d’essais de pompage est généralement réalisée avec la solution de Theis, qui permet d’estimer les paramètres hydrauliques des aquifères poreux, tels que la transmissivité et le coefficient d’emmagasinement, à partir du rabattement du niveau d’eau. The pumping test used here is a tool to explore the 3D architecture of the fluvial reservoir at the scale of the depositional sequence in the floodplain. The conceptual model matched the geological observations in boreholes and corroborates the fluvial sequence stratigraphy of the alluvial plain. The joint use of pumping-well and observation-well data allowed the only appropriate model to be identified-a dual-permeability model characterizing a multilayer aquifer. ![]() The diagnostic performed on the pumping well showed that four conceptual models, with highly contrasted hydrodynamic behaviours, may correspond to the diagnostic. Six analytical models were used to simulate drawdown and its derivatives during a three-day transient pumping test. The proposed approach is applied to an alluvial plain in France, known to be complex because the deposition processes change over time, resulting in channel belts limited by low-permeability deposits in the floodplain or three-dimensional (3D) interconnected structures. Nevertheless, the diagnostic plot is insufficient and must be accompanied by further modelling because of the nonuniqueness of the drawdown log-derivative signal. Here, a diagnostic plot on log-derivative drawdown is used to identify flow regimes and thus aquifer heterogeneities, leading to plausible conceptual models. However, the data fitting can fail and provide only an indication that the pumped aquifer has a complex structure. The study of groundwater resources using pumping test data is usually carried out with the Theis solution, which enables the hydraulic parameters of porous aquifers such as the transmissivity and storage coefficient, to be estimated from the water-level drawdown. ![]() ![]() Hydrogeology Journal volume 30, pages 283–302 ( 2022) Cite this article Melhorando o conhecimento hidrogeológico por meio da interpretação de testes de poço por gráficos de diagnóstico e modelagem: um estudo de caso em um aquífero aluvial na França ![]() Mejora en el conocimiento hidrogeológico a través de la interpretación de ensayos de pozos mediante parcelas de diagnóstico y modelización: un estudio de caso en un acuífero aluvial en Francia Improving hydrogeological understanding through well-test interpretation by diagnostic plot and modelling: a case study in an alluvial aquifer in FranceĪmélioration de la compréhension hydrogéologique grâce à l’interprétation des essais de puits par diagnostic et modélisation: une étude de cas dans un aquifère alluvial en France
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |