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<br />WCOEL PARA,,1ETERS A~ VAR1AI3lES AND THEIR APPLlCATlOO IN THE WCOELlNG PROCESS <br /> <br />Paralreter <br /> <br />Uni ts <br /> <br />I'ppl ication <br /> <br />Varii:lble <br /> <br />B~M----- <br /> <br />-------- Inches---- <br /> <br />RR------- <br /> <br />E\IC------ <br />[RN------ <br /> <br />-------- 0.69------ <br />-------- 1.00------ <br /> <br />~6----- Inches---- <br /> <br />-------- SM$----- Inches---- <br />--------- FR------ Inches per <br /> hour---- <br />KSAT ---- -------- Inches per <br /> hour---- <br />PSP----- -------- Inches---- <br /> <br />RGF------ <br /> <br />-------- Hours----- <br /> <br />KSW------ <br />TC------- <br /> <br />TP ITC---- <br /> <br />-------- Hours---- <br />-------- Minutes-- <br /> <br />-------- 0.50----- <br /> <br />~v------ Inches--- <br /> <br />Soi I~noisture storage at field capacity. Maxi- <br />mum value of base moisture storage variable~ <br />B\1S. <br />Proportion of dai Iy rainfal I that infiltrates <br />the soi L <br />Pan evaporat ion coefficient. <br />Drainage factor for redistril:ution of saturat- <br />ated ,noisture storage, SMS, to base (unsatur- <br />ated moisture storage, BMS, as a fraction of <br />of hydraul ic conductivity, KSAT. <br />Base (unsaturated) moisture storage in active <br />soil column. Simulates antecedent moisture <br />content over the range from wilting-point <br />conditions, BMS=O, to field capacity, BMS- <br />BMSM. <br />"Saturatedll rmisture storage in ....vetted surface <br />layer developed by infiltration of stonn <br />rainfall. <br />Infiltration capacity, a function of KSAT, <br />PSP, Ra=, BMSM, SMS, ElMS. <br />Hydraul ic conduct ivi ty of Usaturatedu trans- <br />mission zone. <br />COmbined effects of moisture deficit, as in- <br />dexed by SMS, and capi Ilary potential (suc- <br />tion) at the ""tting front for ElMS equal to <br />field capacity, ~6M. <br />Ratio of combined effects of moisture deficit, <br />as indexed by ElMS, and capi I lary potential <br />(suction) at wetting front for EIMS=O=wilt- <br />ing point, to the value associated with field <br />capac i ty condi ti ons, PSP. <br />Linear reservoir recession coefficient. <br />Time base (duration) of triangular translation <br />hydrograph . <br />Ratio of time to peak of triangular transla- <br />tion hydrograph to duration of translation <br />hydrograph, TC. <br />Linear reservoi r storage. <br /> <br />The final values of these parameters are given in table 6 for each of the 17 <br />study sites. (Tables 6-9 are in the Supplemental Data section of this report.) <br />The values of one soil-moisture accounting parameter, DRN, and one routing <br />parameter, TPITC, were held constant for all sites at 1.00 and 0.50 units, <br />respectively. Another soil-moisture accounting parameter, EVC, was determined <br />from Kohler, Nordenson, and Baker (1959) to be 0.69 for all sites. All other <br />parameter values were determined by optimization in the modeling process. <br /> <br />11 <br />