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irr_res.f
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irr_res.f
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subroutine irr_res
!! ~ ~ ~ PURPOSE ~ ~ ~
!! this subroutine performs the irrigation operation when the water
!! source is a reservoir
!! ~ ~ ~ INCOMING VARIABLES ~ ~ ~
!! name |units |definition
!! ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
!! aird(:) |mm H2O |amount of water applied to HRU on current
!! |day
!! auto_wstr(:) |none or mm |water stress factor which triggers auto
!! |irrigation
!! iida |julian date |day being simulated (current julian date)
!! wstrs_id(:) |none |water stress identifier:
!! |1 plant water demand
!! |2 soil water deficit
!! flag |1 = manual 2 = auto
!! inum1 |none |reservoir number
!! ipot(:) |none |number of HRU (in subbasin) that is ponding
!! |water--the HRU that the surface runoff from
!! |current HRU drains into. This variable is
!! |used only for rice paddys or closed
!! |depressional areas
!! irramt(:) |mm H2O |depth of irrigation water applied to
!! |HRU
!! irrno(:) |none |irrigation source location
!! |if IRR=1, IRRNO is the number of the
!! | reach
!! |if IRR=2, IRRNO is the number of the
!! | reservoir
!! |if IRR=3, IRRNO is the number of the
!! | subbasin
!! |if IRR=4, IRRNO is the number of the
!! | subbasin
!! |if IRR=5, not used
!! irrsc(:) |none |irrigation source code:
!! |1 divert water from reach
!! |2 divert water from reservoir
!! |3 divert water from shallow aquifer
!! |4 divert water from deep aquifer
!! |5 divert water from source outside
!! | watershed
!! nair(:) |none |sequence number of auto-irrigation
!! |application within the year
!! nhru |none |number of HRUs in watershed
!! nirr(:) |none |sequence number of irrigation application
!! |within the year
!! nro(:) |none |sequence number of year in rotation
!! phuacc(:) |none |fraction of plant heat units accumulated
!! pot_vol(:) |m**3 H2O |current volume of water stored in the
!! |depression/impounded area
!! res_vol(:) |m**3 |reservoir volume
!! sol_sumfc(:) |mm H2O |amount of water held in the soil profile
!! |at field capacity
!! sol_sw(:) |mm H2O |amount of water stored in soil profile on any
!! |given day
!! strsw(:) |none |fraction of potential plant growth achieved
!! |on the day where the reduction is caused by
!! |water stress
!! ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
!! ~ ~ ~ OUTGOING VARIABLES ~ ~ ~
!! name |units |definition
!! ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
!! nirr(:) |none |sequence number of irrigation application
!! |within the year
!! pot_vol(:) |m**3 H2O |current volume of water stored in the
!! |depression/impounded area
!! res_vol(:) |m**3 |reservoir volume
!! ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
!! ~ ~ ~ LOCAL DEFINITIONS ~ ~ ~
!! name |units |definition
!! ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
!! cnv |none |conversion factor (mm => m^3)
!! flag |none |irrigation flag:
!! |0 no irrigation operation on current day
!! |1 scheduled irrigation
!! |2 auto irrigation
!! jres |none |reservoir number
!! k |none |HRU number
!! vmm |mm H2O |depth of irrigation water over HRU
!! vmxi |mm H2O |amount of water specified in irrigation
!! |operation
!! vol |m^3 H2O |volume of water applied in irrigation
!! |operation
!! ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
!! ~ ~ ~ SUBROUTINES/FUNCTIONS CALLED ~ ~ ~
!! Intrinsic: Abs, Min
!! SWAT: irrigate
!! ~ ~ ~ ~ ~ ~ END SPECIFICATIONS ~ ~ ~ ~ ~ ~
use parm
integer :: jres, k, flag
real :: cnv, vmm, vol, vmxi
jres = 0
jres = inum1
do k = 1, nhru
if (irrsc(k) == 2 .and. irrno(k) == jres) then
!! check for timing of irrigation operation
flag = irr_flag(k)
if (auto_wstr(k) > 0.) then
if (wstrs_id(k) == 1 .and. strsw(k) < auto_wstr(k)) flag = 2
if (wstrs_id(k) == 2 .and. sol_sumfc(k) - sol_sw(k) >
& auto_wstr(k)) flag = 2
end if
if (flag == 1) then
sq_rto = irrsq(k)
irrsc(k) = irr_sc(k)
irrno(k) = irr_no(k)
else
sq_rto = irr_asq(k)
irrsc(k) = irr_sca(k)
irrno(k) = irr_noa(k)
endif
if (flag > 0) then
cnv = 0.
cnv = hru_ha(k) * 10.
!! compute maximum amount of water available for irrigation
!! from reach
vmm = 0.
vmm = res_vol(jres) / cnv
!! check available against set amount in scheduled operation
if (flag == 1) then
vmxi = 0.
vmxi = irramt(k)
if (vmxi < 1.e-6) vmxi = sol_sumfc(k)
if (vmm > vmxi) vmm = vmxi
end if
if (flag == 2) then
vmxi = 0.
vmxi = irr_mx(k)
if (vmm > vmxi) vmm = vmxi
end if
if (vmm > 0.) then
vol = 0.
vol = vmm * cnv
!! if (ipot(k) == k) then
if (pot_fr(k) > 1.e-6) then
pot_vol(k) = pot_vol(k) + vol / (10. * potsa(k))
else
call irrigate(k,vmm)
end if
irramt(k) = vmm
if (imgt == 1) then
write (143, 1000) subnum(k), hruno(k), iyr, i_mo, iida,
* hru_km(j), " ", " AUTOIRR", phubase(k), phuacc(k),
* sol_sw(k), bio_ms(k), sol_rsd(1,k),sol_sumno3(k),
* sol_sumsolp(k), aird(k), irrsc(k), irrno(k)
1000 format (a5,1x,a4,3i6,1x,e10.5,1x,2a15,7f10.2,10x,f10.2,70x,
* i10,10x,i10)
end if
!! subtract irrigation from reservoir volume
!! if (ipot(k) /= k) then
if (pot_fr(k) > 1.e-6) then
vol = 0.
vol = aird(k) * cnv
end if
vol = vol / irr_eff(k) !! BN inserted to account for irr. efficiency
res_vol(jres) = res_vol(jres) - vol
if (res_vol(jres) < 0.) res_vol(jres) = 0.
!! advance irrigation operation number
if (flag == 1) then
nirr(k) = nirr(k) + 1
end if
end if
end if
end if
end do
return
end