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The VS2DT Model
Variably-Saturated
2-D
flow and solute Transport
model
VS2DT is a finite difference numerical model
for simulating steady-state or transient unsaturated flow and transport.
Typical applications of the VS2DT model include determining the fate of
agricultural chemicals, landfill leachate, UST leaks, and accidental
chemical spills as they migrate through the unsaturated zone towards the
water table.
Model Details
- Multi-layer profile
- Heterogeneous soil properties
- Depth variable initial conditions for flow
and chemistry
- Transient boundary conditions for flow
(specified head, pressure and flux)
- Transient boundary conditions for
contaminant transport (specified concentration or mass flux)
- Includes a database of soil and chemical
properties
Simulated
Processes
- Transient groundwater flow and contaminant
transport through the vadose zone
- Leaching of contaminants to infiltrating
groundwater, sorption of dissolved contaminants on soil, and first-order
decay of contaminants
Simulation
Results
VS2DT produces detailed graphical and tabular
summaries of both time-series and depth series information including:
- Groundwater concentrations
- Total head and pressure head
- Flow velocity and flow rate
- Contaminant flux rate
- Soil moisture content and saturation
- Accumulated flow balance and mass flux
balance
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