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2021-07-12 - Livre/Chapitre ou partie - Anglais - 9 page(s)

Hoffmann Richard, Goderniaux Pascal , Jamin Pierre, Orban Philippe, Brouyere Serge, Dassargues Alain, "Differentiated influence of the double porosity of the chalk on solute and heat transport" in "The Chalk Aquifers of Northern Europe" , Farrell R. P., Massei N., Foley A. E., Howlett P. R., West L. J.

  • Edition : The Geological Society of London
  • Codes CREF : Hydrogéologie (DI1426)
  • Unités de recherche UMONS : Géologie fondamentale et appliquée (F401)
  • Instituts UMONS : Institut des Sciences et du Management des Risques (Risques), Institut de Recherche en Energétique (Energie)
Texte intégral :

Abstract(s) :

(Anglais) Chalk porosity plays a decisive role in the transport of solutes and heat in saturated chalk. From a geological point of view, there are at least two types of porosity: the porosity of pores corresponding to the micro-spaces between the fossil coccoliths that form the chalk matrix and the porosity owing to the micro- and macro-fractures (i.e. secondary porosity). For groundwater flow, the fracture porosity is a determining factor at the macroscopic scale. The multiscale heterogeneity of the porous/fractured chalk induces different effects on solute and heat transport. For solute transport considered at the macroscopic scale, tracer tests have shown that the ‘effective transport porosity’ is substantially lower than the ‘effective drainable porosity’. Moreover, breakthrough curves of tracer tests show an important influence of diffusion in a large portion of the ‘immobile water’ (‘matrix diffusion’) together with rapid preferential advection through the fractures. For heat transport, the matrix diffusion in the ‘immobile water’ of the chalk is hard to distinguish from conduction within the saturated chalk.

Notes :
  • (Anglais) Peer-reviewed