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I <br /> RISKPRO'S SESOIL for Windows User's Guide <br /> larger the layer (sublayer), the lower the calculated chemical concentration. For this reason, <br /> SESOIL was discretized to allow as many as ten sublayers in each of the four possible major <br /> layers. Thus, the user may define as many as forty smaller compartments using these sublayers, <br />' resulting in an increase in the resolution of the model <br /> 3.2 SESOEL Cycles <br /> Pollutant transport and transformation in the unsaturated soil zone are complex processes <br /> affected by chemical, soil, and hydrogeological properties In SF-SOIL, these processes are <br /> included in one of three cycles: the hydrologic cycle to deal with moisture movement or flow <br /> through the compartment, the sediment or washload cycle to deal with runoff from the soil <br /> surface, and the pollutant fate cycle. SESOIL was developed by integrating three submodels, <br />' one to deal with each cycle The specific processes associated with each cycle are accounted <br /> for in the submodels The cycles and their associated processes are summarized in Table 3 1 <br /> and Figure 3.1 shows a schematic of the soil column <br /> In SESOIL, the hydrologic cycle is done first, followed by the sediment cycle, and these results <br /> are used in the pollutant fate cycle The hydrologic cycle is based on a statistical, dynamic <br /> formulation of a vertical water budget It has been adapted to account for either yearly or <br /> monthly simulations and for moisture variations in the soil The hydrologic cycle controls the <br /> sediment cycle, which is a theoretical monthly washload routine The pollutant cycle simulates <br /> transport and transformation processes in three phases which are present in the soil <br /> compartment: soil-air or gaseous phase, soil-moisture phase, and adsorbed or soil-solids phase <br /> The three mayor cycles are summarized in the sections that follow <br /> Table 3.1 SESOIL CYCLES <br /> Hydrologic Cycle <br /> - Rainfall - Infiltration <br /> - Surface runoff - Groundwater runoff(recharge) <br /> - Capillary rise - Evapotranspiration <br /> - Soil moisture retention (storage) <br /> Sediment Cycle <br /> - Sediment washload (erosion due to storms) <br /> Pollutant Fate Cycle <br /> - Advection - Cation exchange <br /> - Diffusion(air phase) - Volatilization <br /> - Sorption - Hydrolysis <br /> - WashIoad - Surface runoff <br /> - Metal complexation - Groundwater runoff(recharge) <br /> lie - Chemical degradation/decay <br /> Page 7 <br /> I <br />