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SESOIL - Background
Setup SESOIL Model Scenarios
Climatic Database
Chemical Database
Run SESOIL Model Scenarios
SESOIL Reports
SESOIL - Background
Unsaturated Soil Zone Transport and Fate Model
SESOIL is a one-dimensional vertical transport screening-level model for the unsaturated (vadose) zone that simulates RNA based on diffusion, adsorption, volatilization, biodegradation, cation exchange and hydrolysis. SESOIL is an acronym for the Seasonal Soil compartment model. It contains three submodels that simultaneously simulate contaminant transport, soil water movement and soil erosion. It is the vadose zone model by which all other vadose zone models are judged. What sets SESOIL apart is its ability to simulate seasonal climatic variations and varying soil properties with depth. Contaminant transport can be simulated:
- Without biological decay, or
- With biodegradation simulated as a first-order decay process.
SESOIL 6.3 now includes a value for the water diffusion coefficient. This parameter is not used by SESOIL and is simply passed on to AT123D. Version 6.3 of SESOIL also includes a modification to the method of reading input files. This means that the user no longer needs to make changes to the config.sys and autoexec.bat files for SESOIL to run.
Establish Site-Specific Cleanup Objectives
SESOIL can be used to simulate the fate of residual contaminant levels in soil to establish site-specific cleanup objectives. It can also simulate time-dependent releases from underground storage tanks, landfills and agricultural practices. The public domain version of SESOIL was enhanced to simulate up to 999 years of contaminant transport. SEVIEW links the time-dependent contaminant load to groundwater from SESOIL to the AT123D and BIOSCREEN groundwater models.
History
SESOIL was developed for US Environmental Protection Agency in 1981 by Bonazountas and Wagner, at Arthur D. Little, Inc. SESOIL has been updated several times. In 1984 Bonazountas and Wagner added a fourth soil. SESOIL was modified extensively by Hetrick et al., at Oak Ridge National Laboratory to enhance its capabilities. The enhanced version of SESOIL included with SEVIEW was modified in 1997 by M. J. Barden then of the Wisconsin Department of Natural Resources to correct for a mass balance error, which was discovered using the SEVIEW mass balance report. In 1997, Mr. Robert Schneiker of ESCI modified SESOIL to run to 999 years. SESOIL 6.3 now includes the water diffusion coefficient for use in AT123D.
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Setup SESOIL Model Scenarios
All SESOIL Parameters on One Screen
SEVIEW includes sophisticated input screens in which all SESOIL and AT123D input parameters can be entered. The input parameters are presented in tab-organized input screens which are linked to a journal. Input parameters are simply entered and the changes are automatically saved by moving to the next model scenario in the journal or by closing the setup window. This means you do not have to individually open and save each model input file in separate windows. This dramatically reduces the time it takes to establish model scenarios. Quality control is also improved because all of the input parameters can now be quickly scanned.
Climatic Database
Climatic Database
SEVIEW includes a climatic database that contains information on monthly air temperature, cloud cover, relative humidity, short wave albedo, precipitation, length of storm events, number of storms and the distribution of storms for 6,674 cities in the US, Guam, Puerto Rico, and Virgin Islands.
Chemical Database
Chemical Database
SEVIEW includes chemical information for 193 chemicals. This database includes: CAS registry number, chemical formula, water solubility, air diffusion coefficient, water diffusion coefficient, Henry's Law constant, organic carbon adsorption coefficient, molecular weight and liquid phase biodegradation rate data.
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Climatic Database
Climatic Database
SEVIEW includes a climatic database that contains information on monthly air temperature, cloud cover, relative humidity, short wave albedo, precipitation, length of storm events, number of storms and the distribution of storms for 6,674 cities in the US, Guam, Puerto Rico, and Virgin Islands.
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Chemical Database
Chemical Database
SEVIEW includes a 593 record database for 193 chemicals. This database includes: CAS registry number, chemical formula, water solubility, air diffusion coefficient, water diffusion coefficient, Henry's Law constant, organic carbon adsorption coefficient, molecular weight and liquid phase biodegradation rate data.
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Run SESOIL Model Scenarios
Running SESOIL
When you run SESOIL you will see the message "SESOIL BEGINS" followed by hydrologic cycle and other monthly information. When you click on the Run SESOIL command in the navigator SEVIEW will run all completed SESOIL scenarios. If any of the input files or the output file are left blank or if you did not check the run SESOIL check box, SEVIEW will ignore the scenario.
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SESOIL Reports
Four SESOIL Reports
SEVIEW produces four separate SESOIL reports:
- Climate Report,
- Profile and Load Report,
- Hydrologic Cycle Report, and
- Pollutant Cycle Report.
Climate Report
The SESOIL climate report displays the raw climatic input parameters.
Profile and Load Report
The SESOIL Profile and Load Report displays information on the soil profile and contaminant load.
SESOIL Hydrologic Cycle Report
The SESOIL Hydrologic Cycle Report displays predicted values for surface water runoff, soil infiltration, evapotranspiration, soil moisture retention, and groundwater recharge. It also displays predicted soil moisture content.
SESOIL Pollutant Cycle Report
The pollutant cycle report contains several plots and tables that document the results of the SESOIL pollutant fate cycle. The first graph from the top is the mass fate plot. This plot displays the monthly distribution of the contaminant in the SESOIL soil column over time. The leachate concentration plot is located below the mass fate plot. The leachate plot displays the monthly concentration of the contaminant leaving the bottom of the soil column. In addition, the maximum SESOIL leachate concentration value is presented just below the leachate concentration plot. The SESOIL soil column profile is presented next to the leachate plot. The profile displays the thickness of each soil layer in centimeters.
SESOIL Mass Balance Report
The report also contains a mass balance table. The table displays the mass and percentage of the total input mass in each SESOIL process. The mass balance table is displayed below the leachate plot. A depth of contaminant migration through time plot is presented in the lower right portion of the report. The contaminant starting and ending depths, along with the depth to the water table, are presented above the plot. A description and list of the SESOIL input files is presented above the contaminant depth plot.
Summary Table
Whenever you print or preview a pollutant cycle report, SEVIEW creates a SESOIL summary table. The summary table contains a description of the modeled scenario, the percentage of the mass in each of the SESOIL processes, a contaminant travel time to the water table, the maximum leachate concentration and associated infiltration rate, along with some of the chemical and soil properties used in the scenario. The summary table can be saved in numerous formats including EXCEL and Lotus.
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