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<br /> <br />Table 3.5. Characteristic analysis of groundwater-salinity models. <br /> <br />t~tt <br /> <br />Reference <br /> <br />llelweg J. Otto <br />and <br />John W. Labadie <br />1976 <br /> <br />'" <br />"'. <br /> <br />Konikov, F. <br />Leonard and <br />John D. <br />Bredehoeft <br />1974 <br /> <br />Constituents <br />modeled <br />= <br /> <br />1'OOin <br />groundwater <br /> <br />Major assumptions Input data <br />-.E>_~1ity IIDdel____r~rarents <br /> <br />-- Time --- <br />increrrent Conments <br /> <br />The gromdwater is still re- <br />usable. <br /> <br />The concentration of drainage <br />'Water was based on the <br />leaching fornula. <br /> <br />= is canputed fran EC <br />IreaSuren:EIlts via regression <br />equation: <br />= ~ -2 + 0.683 EC <br />(TIf!,/t) (micronhos/an) <br /> <br />M9ximLm allowed difference in <br />concentration betv.7een the <br />drainage water and groundwater <br />was specified (IXXl'I) as a basis <br />for a manage:nent strategy. <br /> <br />There is sane way of ulti- <br />mately reIIDVing salts from <br />the basin, such as by purping <br />dcxYnstream groundwater into an <br />outfall. <br /> <br />If the. basin is closed then a <br />salt sink area mlSt be iden- <br />tified. <br /> <br />There were no sotrrces or sinks <br />of salts in the unsaturated <br />zone of soil profile. <br /> <br />No che:nical reactions occur <br />between the 'Water and the <br />aquifer or soil materials that <br />affect the dissolved solid con- <br />centration. <br /> <br />The lIDVarent of dissolved <br />solids due to bydrodynamic <br />dispersion is proportional <br />to tile concentration gradient. <br /> <br />Source or sink term is added <br />to adjust the gromdwater <br />concentration. <br /> <br />Dissolved solids cbncentrations <br />in the flow leaving a stream <br />cell was calculated from <br />principles of mass balance. <br /> <br />'I'I:S concentration in recharge <br />water was adjusted such thet <br /> <br />Annual average 'IDS Annual <br />in irrigation water, <br />average groundwater <br />concentration level <br />for the beginning <br />of the IIDdel period, <br />and IlCON. <br /> <br />IIydrologeologic IIDnthl Y <br />data, observation <br />well netv;ork. <br />specific conduct- <br />ance of surface <br />and groundwater, = <br /> <br />The mxlel is I1aI1Ei <br />accelerated salt trans- <br />port (ASTRAN) method. <br />It is used to obtain <br />least-cost alternatives <br />for distributing water <br />over tile basin, by ad- <br />justing the parameter <br />IlCON to produce a de- <br />sired degree of salinity <br />control. <br /> <br />Dispersion equation is <br />solved to describe the <br />che:nical concentration <br />in the gromdwater systEm. <br /> <br />MxJel <br />Application <br /> <br />Bonsall Sub- <br />basin in the <br />San Luis !ley <br />River Basin, <br />California <br /> <br />Arkansas River <br />Valley, SE <br />Colorado <br />