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<br /> <br /> 2~EE <br /> Table 3.4. Continued. <br /> Constituents Major Assumptions Input data TiIDe Modal <br /> Reference modaled in salinity mde1 requirements increnent Comrents Application <br /> Khan (cont.) The saturated zone rrodel assumes <br /> a mass-transport equation mich <br /> includes both convective trans- <br /> port and dispersion, with the <br /> latter assumed proportional to <br /> the concentration gradient. <br /> Chemical reactions and ion <br /> exchange in the saturated zone <br /> are ignoced. <br /> Shaffer et al. - + Unsaturated flow Many physical and 0.001 day <br /> 003, NH4 It may be uneconanica1 to Vernal, Utah, <br /> 1977 Solutes contained in the chemical parameters to collect necessary field Grand Valley, <br /> ea2+ Na+, -water rrove with the water into are required. 0.1 day data and make model runs. Colorado <br /> and/or iran adjacent segments. The nodel s:imJlates many <br /> +2 - <br /> ~ ,HC03, Each cell is spatially hOllD- inportant physical and <br /> geneous, and solutes trans- chemical processes which <br /> Cl-, CO; ferred into a segment or have been identified and <br /> cell_ are mixed with those expressed in equation fom. <br /> 2- already in the celL Rate equations for nitrogen <br /> and SO 4 Saturated flow transformations are statis- <br />'" Water moves by piston dis- tical and may not be valid <br />.... placement through successive outside derivation data set. <br /> segments tmtil it reaches the User may not by completely <br /> drain. aware of all the options in <br /> Lateral dispersion and dif- the modeL <br /> fusion are ignored. <br /> Kinetic approach is used for <br /> nitrogen transfonnation. <br /> Equilibritml conditions exist <br /> for salt or inorganic chen- <br /> istry . <br /> Drain effluent <br /> No chemical reactions occur <br /> after the mixing process in <br /> the drains. <br /> Willardson, ea+2, ~+2 Salt lIOVes with water. Variable dapending one Modal is designed for cal- Ashley Valley <br /> Lyman S., R. J. + + - As the volune of water in the whether SALT Fl.(M I, m:mth carious soils. Northem Utah <br /> Hanks and J. J. Na,K,Cl, soil is decreased, the salt SALT Fl.(M II, or Model capabilities include, <br /> Jurinak, 1979 SALT Fl.(M III is <br /> S04-' HCO;, concentration increases and selected. a) Salt can be moved <br /> chemical precipitation may through the soil profile <br /> occur. without chemical reactions <br /> SAR, B Chemistry node1 as.stmEs that with the soil (SALT Fl.(M I), <br /> v b) Salt can be moved in <br /> (1) Soil contains line. cODtdnation with chanical <br /> (2) Each soil depth increllEtlt precipitation and <br />