subroutine nut_psed !! ~ ~ ~ PURPOSE ~ ~ ~ !! this subroutine calculates the amount of organic and mineral phosphorus !! attached to sediment in surface runoff !! ~ ~ ~ INCOMING VARIABLES ~ ~ ~ !! name |units |definition !! ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ !! enratio |none |enrichment ratio calculated for day in HRU !! erorgp(:) |none |organic P enrichment ratio, if left blank !! |the model will calculate for every event !! ihru |none |HRU number !! sedyld(:) |metric tons |daily soil loss caused by water erosion in !! |HRU !! ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ !! ~ ~ ~ OUTGOING VARIABLES ~ ~ ~ !! name |units |definition !! ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ !! sedminpa(:) |kg P/ha |amount of active mineral phosphorus sorbed to !! |sediment in surface runoff in HRU for day !! sedminps(:) |kg P/ha |amount of stable mineral phosphorus sorbed to !! |sediment in surface runoff in HRU for day !! sedorgp(:) |kg P/ha |amount of organic phosphorus in surface !! |runoff in HRU for the day !! ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ !! ~ ~ ~ ~ ~ ~ END SPECIFICATIONS ~ ~ ~ ~ ~ ~ use hru_module, only : hru, sedyld, sedorgp, sedminpa, sedminps, ihru, enratio, & ihru use soil_module use plant_module use organic_mineral_mass_module implicit none integer :: j = 0 !none |HRU number real :: sedp_attach = 0. !kg P/ha |amount of phosphorus attached to sediment ! |in soil real :: wt1 = 0. !kg/ha |weight of upper soil layer real :: er = 0. !none |enrichment ratio real :: frac = 0. !none |fraction of organic P in soil real :: sedp = 0. !kg P/ha |total amount of P removed in sediment erosion real :: sed_orgp = 0. !kg P/ha |total amount of P in organic pools real :: sed_hump = 0. !kg P/ha |amount of P in humus pool real :: sed_manp = 0. !kg P/ha |amount of P in manure soil pool real :: sed_rsd_manp = 0. !kg P/ha |maount of P in residue manure pool real :: fr_orgp = 0. !kg P/ha |fraction of organic phosphorus in soil (humus + manure in soil + manure in residue) real :: fr_actmin = 0. !kg P/ha |fraction of active mineral phosphorus in soil real :: fr_stamin = 0. !kg P/ha |fraction of stable mineral phosphorus in soil j = ihru !! HRU sediment calculations sedp_attach = soil1(j)%hsta(1)%p + soil1(j)%man(1)%p + rsd1(j)%man%p + soil1(j)%mp(1)%sta + soil1(j)%mp(1)%act if (sedp_attach > 1.e-9) then fr_orgp = (soil1(j)%hsta(1)%p + soil1(j)%man(1)%p + rsd1(j)%man%p) / sedp_attach fr_actmin = soil1(j)%mp(1)%sta / sedp_attach fr_stamin = soil1(j)%mp(1)%act / sedp_attach end if !! kg/ha = t/m3 * mm * 10,000 m2/ha * m/1000 mm * 1000 kg/t wt1 = 10000. * soil(j)%phys(1)%bd * soil(j)%phys(1)%d if (hru(j)%hyd%erorgp > .001) then er = hru(j)%hyd%erorgp else er = enratio end if frac = sedp_attach * er / wt1 !! kg/ha = t / ha * 1000. kg/t sedp = 1000. * frac * sedyld(j) / hru(j)%area_ha if (sedp > 1.e-9) then sedorgp(j) = sedp * fr_orgp sedminpa(j) = sedp * fr_actmin sedminpa(j) = amin1 (sedminpa(j), soil1(j)%mp(1)%act) soil1(j)%mp(1)%act = soil1(j)%mp(1)%act - sedminpa(j) sedminps(j) = sedp * fr_stamin sedminps(j) = amin1 (sedminps(j), soil1(j)%mp(1)%sta) soil1(j)%mp(1)%sta = soil1(j)%mp(1)%sta - sedminps(j) sed_orgp = soil1(j)%hsta(1)%p + soil1(j)%man(1)%p + rsd1(j)%man%p if (sed_orgp > 1.e-6) then sed_hump = sedorgp(j) * (soil1(j)%hsta(1)%p / sed_orgp) sed_hump = amin1 (sed_hump, soil1(j)%hsta(1)%p) soil1(j)%hsta(1)%p = soil1(j)%hsta(1)%p - sed_hump sed_manp = sedorgp(j) * (soil1(j)%man(1)%p / sed_orgp) sed_manp = amin1 (sed_manp, soil1(j)%man(1)%p) soil1(j)%man(1)%p = soil1(j)%man(1)%p - sed_manp sed_rsd_manp = sedorgp(j) * (rsd1(j)%man%p / sed_orgp) sed_rsd_manp = amin1 (sed_rsd_manp, rsd1(j)%man%p) rsd1(j)%man%p = rsd1(j)%man%p - sed_rsd_manp end if else sedorgp(j) = 0. sedminpa(j) = 0. sedminpa(j) = 0. sedminps(j) = 0. sedminps(j) = 0. end if return end subroutine nut_psed