SESOIL is a finite-difference soil compartment model designed for long-term hydrologic, sediment, and pollutant fate simulations. The model is designed to estimate pollutant concentrations in the soil following introduction via direct application at the surface and/or interaction with other media (i.e., deposition from air). In SESOIL, a soil compartment is a soil column extending from the ground surface through the unsaturated zone to the upper level of the saturated zone. The model distinguishes three major components, the hydrological cycle, the sediment cycle and pollutant transport and fate. Each of these components are represented by separate submodels within the SESOIL code.
Elements of the hydrologic cycle included are rainfall, surface runoff, infiltration, soil water content variations, evapotranspiration, and ground-water runoff; simulation of the sediment cycle include sediment washload from rainstorms and sediment resuspension due to wind; the pollutant transport and fate component consists of advection, diffusion, volatilization, adsorption and desorption, and chemical degradation or decay. SESOIL does not address contaminant movement in the saturated zone. SESOIL is considered a screening-level model with limited soil, chemical and climatological data needs. Output includes pollutant concentrations at various soil depths, and pollutant loss from the unsaturated zone in terms of surface runoff, percolation to ground water, volatilization, and degradation. This version of SESOIL calculates soil temperature from seasonal air temperature values. Climate can be entered on an annual or monthly basis.
The IGWMC version of SESOIL is based on the extensively modified version prepared by Oak Ridge National Laboratory in phases between 1986 and 1992. This public domain software does not have a preprocessor. Data input requires a text editor (such as Windows Notepad) and familiarity with Fortran input formats. Commercial, proprietary versions including input processors are available from third parties.
Intel 80i86 processor with math coprocessor, 2 Mb Kb RAM, DOS 5.0 or higher, at least 2 Mb free disk space, CGA graphics or higher (no graphics).
Authors: M. Bonazountas and J.M. Wagner