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Development of a coupled flow and transport 3D model for simulating sea-water intrusions in coastal aquifers
Carabin, G.; Dassargues, A. (1999). Development of a coupled flow and transport 3D model for simulating sea-water intrusions in coastal aquifers, in: De Breuck, W. et al. (Ed.) Proceedings of the 15th Salt-Water Intrusion Meeting Ghent (Belgium), 25-29 May 1998. Natuurwetenschappelijk Tijdschrift, 79(1-4): pp. 35-42
In: De Breuck, W.; Walschot, L. (Ed.) (1999). Proceedings of the 15th Salt-Water Intrusion Meeting Ghent (Belgium), 25-29 May 1998. Natuurwetenschappelijk Tijdschrift, 79(1-4). Natuurwetenschappelijk Tijdschrift: Gent, Belgium. 307 pp., more
In: Natuurwetenschappelijk Tijdschrift. L. Walschot/Natuur- en Geneeskundige Vennootschap: Gent. ISSN 0770-1748, more
Peer reviewed article  

Available in  Authors 
    VLIZ: Proceedings D [27345]
Document type: Conference paper

Keywords
    Ground water; Models; Saline intrusion; Marine

Authors  Top 
  • Carabin, G.
  • Dassargues, A.

Abstract
    In coastal zones, the seawater intrusions are stressed by fresh-water drainage or pumping in the upper parts of the aquifers. A finite-element programme able to simulate the mixing zone in 3D is proposed: the SUFT3D code (Saturated Unsaturated Flow and Transport 3D model). The coupled equations describing the transport and density-dependent flow are implemented assuming the "classical Boussinesq approximation". A mixed formulation (water content -pressure head) is used in the flow equation to solve the mass-conservation problems in the unsaturated zone. The simulated transport processes are advection, diffusion, dispersion, linear degradation, adsorption (with linear, Langmuir or Freundlich isotherm) and eventual immobile water effect. Different theoretical tests have been performed to validate the code by comparison to cases described in the literature. Then the complexity of the tests is progressively increased in order to check the ability of the code for modelling real practical cases: confined and unconfined aquifers, small- and large-scale domains, homogeneous and heterogeneous groundwater flow and transport parameters. Simulations including river interactions with groundwater are also successfully performed.

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