1. General Model Information

Name: Viral Flow and Transport in the Unsaturated Zone

Acronym: VIRTUS

Main medium: terrestrial
Main subject: biogeochemistry, hydrology
Organization level: ecosystem
Type of model: partial differential equations (finite differences,1D)
Main application:
Keywords: soil, viral transport through soil, unsaturated, virus adsorption, virus degradation, transient state, richards equation, finite differences


Walter Russell
U.S. Salinity Laboratory
450 West Big Springs Road
Riverside, CA 92507-4716

Tel: 909-369-4850
FAX: 909-342-4964
Email: wrussell@ussl.ars.usda.gov



VIRTUS (Viral Flow and Transport in the Unsaturated Zone) is a predictive finite difference model for virus fate and transport in unsaturated soil. The model allows the virus inactivation rate to vary based on soil temperature. The model supports unsteady flow, transport in layered soils, different virus inactivation rates for adsorbed versus freely suspended virus particles, and the flow of heat through soils. It is assumed that viruses are introduced at the soil surface. Based on mass conservation of a contaminant in porous media and couples the flow of water, viruses, and heat through soil. The model can be used to estimate the number of viruses that reach the groundwater after travelling through the soil from a contamination source. The upper boundary condition for flow is described in terms of total water flux and includes the effects of precipitation and evaporation. The upper condition for virus transport includes virus infiltration with rain. The bottom of the profile is a fixed water table elevation with constant soil water content and temperature.

Source of he Abstract: IGWMC

II. Technical Information

II.1 Executables:

Operating System(s): DOS Distributed by :IGWMC

II.2 Source-code:

Programming Language(s): FORTRAN

II.3 Manuals:

II.4 Data:

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

III.2.1 Input

III.2.2 Output

IV. References

V. Further information in the World-Wide-Web

VI. Additional remarks

Last review of this document by: T. Gabele: 26. 6. 1997 -
Status of the document:
last modified by Tobias Gabele Wed Aug 21 21:44:52 CEST 2002

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