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Poster De Conférence Année : 2004

Experimental determination of equivalent parameters with tracer tests

Résumé

With the heterogeneity of the natural environment, the study of the hydrodynamics and mass transfer in groundwater requires the determination ofequivalent parameters: the equivalent permeability and the macrodispersivity. This work deals with the determination of these parameters with tracer tests. A Model, "Modèle d’Analyse et de Recherche sur la Contamination des EAUx Souterraines" (MARCEAUS) was developed to carry out controlled experiments in a largesized heterogeneous medium (6x1x1 m3) which has some statistical properties. Concentration, via the electric conductitivity, and piezometry are measured in the field. After the development of the device, 7 experiments were carried out in uniform or radial flow. The interpretation of the breakthrough curves shows the influence of local heterogeneities on the transport of the tracer: establishment of preferential paths and three-dimensional flows. The results obtained show that it is possible to determine equivalent hydrodynamical and transport parameters owing to measurements of concentrations. An adapted numerical model is proposed for each type offlow (uniform and radial). The experimental values are different from one experiment to another and higher than the theoretical values. But the theoretical developments used do not hold account of the boundary conditions. The permeabilities are of the same order of magnitude and are bounded by the theoretical values of Cardwell and Parson. The values of macrodispersivity are lower in the case of injection-pumping. The comparison of the values shows the importance of the capture zone of the wells.
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Dates et versions

hal-03751091 , version 1 (13-08-2022)

Identifiants

  • HAL Id : hal-03751091 , version 1

Citer

Charles Danquigny, Philippe Ackerer. Experimental determination of equivalent parameters with tracer tests. EGU 1st General Assembly, Apr 2004, Nice, France. ⟨hal-03751091⟩

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