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THE FISSURED AQUIFEROUS KNOWLEDGE: TRUMPS AGAINST POLLUTION

type de publication      article dans une revue internationale avec comité de lecture
date de publication 1988
auteur(s) Carlier Erick; Crampon Norbert
journal (abréviation) IAHS Publication (Red Book) (IAHS Publ.)
volume (numéro) IAHS Publ. 176
  
pages 995 – 999
résumé This paper proposes a method for studying fissured aquiferous. About hydraulic, it is necessary to determine geometrical parameters of fractures which are direction, frequency and aperture, and which enables to compute hydraulic conductivity tensor and underground flow directions which may be different of hydraulic gradient. The knowledge of these directions is fundamental for pollution propagation studies, and, therefore, for springs and drillings protection. The results of transport equations are sometimes desagreed with experimental results; this difference may be explained by a gradual diminution of the aperture of the fractures in depth. A simulation of this phenomenon shows, in first time, a linear variation of the dispersivity in function of closing angle, and, also, in function of injection time of- the tracer. At last, new dispersion equations are presented; they use parameters which seem to be indépendant of hydraulic data.
mots clés karst, fracturation, dispersivity, pollution, protection
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