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UnSat Suite combines various popular unsaturated zone models in a powerful graphical environment especially designed for simulating one-dimensional groundwater flow and contaminant transport through the unsaturated zone. These models are described in detail below.
SEasonal compartment model for long-term pollutant fate and transport in the unsaturated SOIL zone.
SESOIL is commonly used by the EPA as a screening tool in performing exposure assessments and for analyzing and prioritizing chemical exposures at contaminated sites. SESOIL has also been applied in risk assessments for estimating the potential impacts of surface spills on underlying aquifers.
Model Details
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Multi-layer profile (maximum of four layers)
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Heterogeneous soil properties (for transport parameters only)
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Depth variable and time variable initial concentrations
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Time-variant flow boundary conditions (atmospheric boundary condition)
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Automatic generation of up to 100 years of weather data
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Built-in database of soil parameters and chemical properties
Simulated Processes
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Hydrologic cycle of the unsaturated soil zone
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Pollutant fate processes including volatilization, adsorption, cation exchange, biodegradation, hydrolysis and complexation
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Pollutant concentrations and masses in water, soil and air phases
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Pollutant migration to groundwater
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Pollutant volatilization at the ground surface
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Pollutant transport in washload due to surface runoff and erosion at the ground surface
Simulation Results
SESOIL creates an output file containing monthly results for each layer and sub-layer of the model including:
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Hydrologic cycle components
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Pollutant mass distribution adsorbed on the soil
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Pollutant concentration distribution in soil moisture
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Pollutant concentration distribution in soil vapor
Vadose zone LEACHing model
VLEACH is a one-dimensional finite difference model for simulating the vertical mobilization and migration of dissolved organic contaminants through the vadose zone. This model
is commonly used to evaluate potential groundwater impacts, and to predict volatilization or VOCs.
Model Details
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One layer profile
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Homogeneous soil properties
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Depth-dependent initial soil concentrations
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Constant recharge rate
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Includes a limited database of soil and chemical properties
Simulated Processes
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Steady-state flow and transport of volatile organic contaminants through the unsaturated zone
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Leaching of soil contaminants to infiltrating groundwater, sorption of dissolved contaminants on soil
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Volatilization and diffusion of contaminants to the atmosphere
Simulation Results
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Graphical and tabular reports of soil concentration vs. time for selected profile depths
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Graphical and tabular reports of groundwater concentration vs. time for selected profile depths
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Graphical and tabular reports of vapor phase concentration vs. time for selected profile depths
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Profile mass balances for soil, groundwater and vapor phase
PESTicide ANalytical model
PESTAN is a one-dimensional analytical model for predicting the transport and degradation of dissolved pesticides through the unsaturated zone. PESTAN is commonly used for
initial screening assessments to evaluate the potential for groundwater contamination by pesticides used in agriculture.
Model Details
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One layer profile
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Homogeneous soil properties
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Multiple initial pesticide applications
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Constant recharge rate
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Includes a limited database of soil and chemical properties
Simulated Processes
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Steady-state flow and transport of pesticides through the unsaturated zone
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Leaching of pesticides to infiltrating groundwater, sorption of dissolved pesticides on soil, and first order decay of pesticides
Simulation Results
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Graphical and tabular reports of soil concentration vs. time for selected profile depths
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Graphical and tabular reports of groundwater concentration vs. time for selected profile depths
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Graphical and tabular reports of vapor phase concentration vs. time for selected profile depths
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Profile mass balances for soil, groundwater and vapor phase
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
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Multi-layer profile
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Heterogeneous soil properties
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Depth variable initial conditions for flow and chemistry
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Transient boundary conditions for flow (specified head, pressure and flux)
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Transient boundary conditions for contaminant transport (specified concentration or mass flux)
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Includes a database of soil and chemical properties
Simulated Processes
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Transient groundwater flow and contaminant transport through the vadose zone
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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:
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Groundwater concentrations
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Total head and pressure head
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Flow velocity and flow rate
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Contaminant flux rate
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Soil moisture content and saturation
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Accumulated flow balance and mass flux balance
Hydrologic Evaluation of Landfill Performance
The HELP model is a finite difference model used to evaluate the hydrologic performance of landfills containing multiple layers and different layer combinations. The model is used to predict the seasonal generation, percolation and drainage of landfill leachate due to precipitation and infiltration.
Model Details
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Multi-layer profile
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Heterogeneous soil properties
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Transient atmospheric boundary condition data
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International weather generator (3,000 weather stations globally)
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Includes a limited database of soil properties
UnSat Suite contains detailed on-line help and is accompanied by a comprehensive user's manual containing easy-to-follow instructions and a step-by-step tutorial. Technical
support is provided by phone, fax or email .
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sws-info@slb.com
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