Documentation of the Seawater Intrusion (SWI2) Package for MODFLOW

Bakker, Mark; Schaars, Frans; Hughes, Joseph D; Langevin, Christian D; Dausman, Alyssa M

ISBN 10: 1500296694 / ISBN 13: 9781500296698

Published by CreateSpace Independent Publishing Platform, 2014

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Bibliographic Details

• Title: Documentation of the Seawater Intrusion (SWI2) Package for MODFLOW
• Publisher: CreateSpace Independent Publishing Platform
• Publication Date: 2014
• Language: English
• ISBN 10: 1500296694
• ISBN 13: 9781500296698
• Binding: Soft cover
• Condition: New

About this title

Synopsis

The SWI2 Package is the latest release of the Seawater Intrusion (SWI) Package for MODFLOW. The SWI2 Package allows three-dimensional vertically integrated variable-density groundwater flow and seawater intrusion in coastal multiaqui- fer systems to be simulated using MODFLOW-2005. Verti- cally integrated variable-density groundwater flow is based on the Dupuit approximation in which an aquifer is vertically dis- cretized into zones of differing densities, separated from each other by defined surfaces representing interfaces or density isosurfaces. The numerical approach used in the SWI2 Pack- age does not account for diffusion and dispersion and should not be used where these processes are important. The resulting differential equations are equivalent in form to the ground- water flow equation for uniform-density flow. The approach implemented in the SWI2 Package allows density effects to be incorporated into MODFLOW-2005 through the addition of pseudo-source terms to the groundwater flow equation without the need to solve a separate advective-dispersive transport equation. Vertical and horizontal movement of defined density surfaces is calculated separately using a combination of fluxes calculated through solution of the groundwater flow equation and a simple tip and toe tracking algorithm.