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Application |
GeoStudio |
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Version |
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Primary Analysis |
CTRAN/W |
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Keywords |
GeoStudio, CTRAN/W, Source, Exit, Boundary, Conditions |
Introduction
There are three basic boundary conditions for the divergence form of the contaminant transport equation: (1) specified concentration (Dirichlet), (2) specified normal dispersive and advective flux (Neumann) and (3) specified concentration and normal dispersive and advective flux (Cauchy). In many cases, these boundary conditions are sufficient and easily defined. For example, a contaminant source could be specified using either the Dirichlet (constant concentration) or Neumann (constant mass flux) type boundary condition. In transport analyses, however, the plume often reaches the far-field boundary, in which case none of these boundary conditions apply. Frind (1988) formulated a free exit (Cauchy) boundary condition that allows mass to exit by both advection and dispersion while responding to the changing concentration at the boundary. The free exit (Cauchy) boundary condition implemented in GeoStudio only allows mass to leave by advection. The objectives of this example are to: (1) demonstrate the use of the constant and source concentration boundary conditions, (2) demonstrate the use of the solute free exit mass flux and solute mass flux boundary conditions, and (3) compare the results from GeoStudio to a closedform solution of the advection-dispersion equation in a semi-infinite medium.
Downloads
▪ 📗 GeoStudio - CTRAN/W - Source and Exit Boundary Conditions - Information [PDF]
▪ 💻 GeoStudio - CTRAN/W - Source and Exit Boundary Conditions - Project [gsz]
See also