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Relations entre réponses impulsionnelles et conditions hydrodynamiques dans le cadre de traçages artificiels des aquifères karstiques: applications sur colonne de laboratoire et sur un système karstique à double entrée dans le Causse de Gramat (Lot,

type de publication      article dans une revue internationale avec comité de lecture
date de publication 1993
auteur(s) Dzikowski Marc; Carlier Erick; Crampon Norbert; De Marsily Ghislain
journal (abréviation) IAHS Publication (Red Book) (IAHS Publ.)
volume (numéro) 207
  
pages 391 – 404
résumé The purpose of this paper is to study the problem of the transfer of a conservative tracer in a karst or porous aquifer where the hydrodynamic regime can vary, as it is often the case of tracer tests in karst terranes. Theoretical relationships established between the impulse responses to an instantaneous injection of tracer and the constant flow rate in a pipe are extrapolated for impulse responses defined in an unsteady state. This model is called method of transformation. This approach is a step toward the analysis of non linear systems. For different scales of transport the impulse responses are defined from short time injection. The validity of these relationships has been quantitatively assessed by tracer tests in columns in the laboratory at different constant flow rates and for a variable flow rate. The method of transformation is used for the study of transfer in conduit flow on a karstic system in the Causse de Gramat where tracer experiments have been undertaken for different hydrodynamic conditions.
mots clés réponse impulsionnelle, transitoire, pollution, karst
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