Dans ce cas bidimensionnel le rayon hydraulique rh

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Unformatted text preview: ulting seawater wedge is very heterogeneous. This can be seen from Fig. 4(a), where ZSALT(x,y) is shown for the case of largest variability (σlnK = 4.0). In addition, Fig. 4(b) shows the spatial moment σZSALT(x) plotted as a function of distance from the seashore, for σlnK = 1.0 up to σlnK = 4.0. This extends results by Ababou & Al-Bitar (2005); they analysed σZSALT(x) using a perturbation approximation, valid up to σlnK = 1.6. 5 CONCLUSIONS AND OUTLOOK The seawater intrusion problem (sharp interface approach) in randomly heterogeneous coastal aquifers is computationally challenging for three reasons: (1) the problem is nonlinear due to the presence of two unknown surfaces (freshwater and saltwater); (2) large grids are needed in order to compute spatial statistics; (3) the condition of the system becomes worse with both grid size and random permeability contrast (σlnK). We used different criteria and procedures to control numerical accuracy and performance. Mass balance was close to zero for most...
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This document was uploaded on 01/19/2014.

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