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Unformatted text preview: etration length of the salt wedge toe
Key words Seawater intrusion; saltwater; coastal aquifers; porous media; random media; uncertainty;
hydrogeology; numerical modelling; perturbation methods; upscaling. 1 INTRODUCTION Seawater intrusion is a well known problem occurring in coastal aquifers. This phenomenon
can take the form of a seawater wedge extending inland below freshwater. Here we focus on
the effects of permeability heterogeneity on the extent of the seawater wedge in a phreatic
coastal aquifer. Seawater intrusion is analysed using 2D plane flow Dupuit-Boussinesq
approximation, combined to a sharp interface approach (Ghyben-Herzberg). Aquifer
heterogeneity is represented via a 2D random field permeability (vertically integrated). The
simulations are conducted for mildly to highly heterogeneous random fields, with natural
log-permeability standard deviation (σlnK) ranging from 1.0 to 4.0. This paper focuses on the
need for numerical accuracy in the case of highly heterogeneous...
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- Winter '14
- The Land, In French