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Communication Dans Un Congrès Année : 2005

Saltwater intrusion modelling with an efficient multiphase approach: Theory and several field applications.

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Résumé

Groundwater resources in Mediterranean coasts are often limited by saltwater intrusion. In order to assess accurately the available resources it is usually necessary to model the consequences of implementing new wells in the aquifer. A common approach for taking into account the presence of saltwater is to use a variable density model. This classical method however is plagued by several drawbacks: first the system must be modelled in 3D in order to account for the density effects, even when the aquifer could be considered as monolayer; second this scheme usually introduces artificial smearing due to numerical dispersion. An alternative very efficient method is to use a special multiphase approach with two separated fluids, freshwater and saltwater coupled with an equivalent retention law, which respects the saltwater and freshwater equilibrium in each model cell. This method, which may be used in steady state as well as in transient state has several decisive advantages: it may be used for monolayer aquifers, or if needed for multilayer systems, the interface between the two fluids is sharp without any smearing, and the calculations are very fast (often on the order of magnitude of 30 to 50 times faster than with the classical variable density method). The method has been verified with a set of available analytical solutions. It has been applied with success to field cases. Several cases are presented: in the island of Malta and in Camargue (South of France).
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hal-01061946 , version 1 (08-09-2014)

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  • HAL Id : hal-01061946 , version 1

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Dominique Thiéry. Saltwater intrusion modelling with an efficient multiphase approach: Theory and several field applications.. 18th Salt Water Intrusion Meeting : 18 SWIM, May 2004, Carthagena, Spain. pp. 97-110. ⟨hal-01061946⟩

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