Browsing by Author "Guerin, M"

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    GMT3D - coupling MT3D and MODPHRQ for modelling mulitcomponent reactive transport
    (World Scientific, 1997-09-29) Guerin, M; Zheng, C
    Reactive transport models have been undergoing development for several decades. Many codes have been documented in the literature and applied to various problems [3] especially in the natural resources, mining and radioactive waste disposal industries. GMT3D is a new three-dimensional multicomponent reactive transport model developed to simulate the aqueous transport and equilibrium geochemistry of multiple chemical species in solution. The code couples MT3DMS [13], a multicomponent version of the three-dimensional transport code MT3D [12], with the equilibrium geochemical code MODPHRQ MODPHRQ is an extended and updated version of the USGS code PHREEQE. Three major conceptual choices were made in developing GMT3D. The first choice was for the type of geochemical model, the choices being kinetic or equilibrium type models. Equilibrium chemistry was chosen over kinetic chemistry since thermodynamic data is more extensive and much better documented than kinetic data. The second choice was for a conceptual model for the transport of aqueous solutes. The deterministic PDE describing advective-dispersive transport was chosen. The final choice was on how to couple the transport PDE’s with the non-linear equations describing equilibrium chemistry. Details on the coupling are presented in Section 3. © World Scientific
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    Uranium and other contaminant migration in groundwater at a tropical Australian Uranium Mine
    (Elsevier, 1998-12-15) Brown, PL; Guerin, M; Hankin, SI; Lowson, RT
    Hydrogeochemical modelling (utilising the modelling tools MODFLOW, MT3D and HARPHRQ) has been used in conjunction with laboratory-based experiments and a field monitoring program to investigate the fate of uranium and other contaminants in excess water sprayed on a 33 ha region of the Ranger Uranium Mine (RUM), northern Australia. The results indicate that uranium is retained in the surficial layer of the lateritic soils of the area. Conservative contaminants are not retained by the soils and are transported into the groundwater. Subsequently, they migrate relative to the groundwater flow rate towards the river system down hydraulic gradient of the irrigation area. © 1998 Elsevier Science B.V.