[8403] | 1 | MODULE wet_dry |
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| 2 | |
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| 3 | !! includes updates to namelist namwad for diagnostic outputs of ROMS wetting and drying |
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| 4 | |
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| 5 | !!============================================================================== |
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| 6 | !! *** MODULE wet_dry *** |
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| 7 | !! Wetting and drying includes initialisation routine and routines to |
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| 8 | !! compute and apply flux limiters and preserve water depth positivity |
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| 9 | !! only effects if wetting/drying is on (ln_wd == .true.) |
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| 10 | !!============================================================================== |
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| 11 | !! History : 3.6 ! 2014-09 ((H.Liu) Original code |
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| 12 | !! ! will add the runoff and periodic BC case later |
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| 13 | !!---------------------------------------------------------------------- |
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| 14 | |
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| 15 | !!---------------------------------------------------------------------- |
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| 16 | !! wad_lmt : Compute the horizontal flux limiter and the limited velocity |
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| 17 | !! when wetting and drying happens |
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| 18 | !!---------------------------------------------------------------------- |
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| 19 | USE oce ! ocean dynamics and tracers |
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| 20 | USE dom_oce ! ocean space and time domain |
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| 21 | USE sbc_oce, ONLY : ln_rnf ! surface boundary condition: ocean |
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| 22 | USE sbcrnf ! river runoff |
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| 23 | USE in_out_manager ! I/O manager |
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| 24 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
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| 25 | USE lib_mpp ! MPP library |
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| 26 | USE wrk_nemo ! Memory Allocation |
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| 27 | USE timing ! Timing |
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| 28 | |
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| 29 | IMPLICIT NONE |
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| 30 | PRIVATE |
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| 31 | |
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| 32 | !!---------------------------------------------------------------------- |
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| 33 | !! critical depths,filters, limiters,and masks for Wetting and Drying |
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| 34 | !! --------------------------------------------------------------------- |
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| 35 | |
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| 36 | REAL(wp), PUBLIC, ALLOCATABLE, DIMENSION(:,:) :: wdmask !: u- and v- limiter |
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| 37 | REAL(wp), PUBLIC, ALLOCATABLE, DIMENSION(:,:) :: ht_wd !: wetting and drying t-pt depths |
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| 38 | ! (can include negative depths) |
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| 39 | REAL(wp), PUBLIC, ALLOCATABLE, DIMENSION(:,:) :: wdramp, wdrampu, wdrampv ! for hpg limiting |
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| 40 | |
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| 41 | LOGICAL, PUBLIC :: ln_wd !: Wetting/drying activation switch (T:on,F:off) |
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| 42 | REAL(wp), PUBLIC :: rn_wdmin0 !: depth at which wetting/drying starts |
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| 43 | LOGICAL, PUBLIC :: ln_rwd !: ROMS Wetting/drying activation switch (T:on,F:off) |
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| 44 | REAL(wp), PUBLIC :: rn_wdmin1 !: minimum water depth on dried cells |
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| 45 | REAL(wp), PUBLIC :: rn_wdmin2 !: tolerance of minimum water depth on dried cells |
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| 46 | REAL(wp), PUBLIC :: rn_wdld !: land elevation below which wetting/drying |
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| 47 | !: will be considered |
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| 48 | INTEGER , PUBLIC :: nn_wdit !: maximum number of iteration for W/D limiter |
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| 49 | LOGICAL, PUBLIC :: ln_rwd_bc !: ROMS scheme: True implies 3D velocities are set to the barotropic values at points |
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| 50 | !: where the flow is from wet points on less than half the barotropic sub-steps |
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| 51 | LOGICAL, PUBLIC :: ln_rwd_rmp !: use a ramp for the rwd flux limiter between 2 rn_wdmin1 and rn_wdmin1 (rather than a cut-off at rn_wdmin1) |
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| 52 | REAL(wp), PUBLIC :: rn_ssh_ref !: height of z=0 with respect to the geoid; |
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| 53 | REAL(wp), PUBLIC :: rn_ht_0 !: the height at which ht_0 = 0 |
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| 54 | |
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| 55 | LOGICAL, PUBLIC :: ln_wd_diag ! True implies wad diagnostic at chosen point are printed out |
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| 56 | INTEGER , PUBLIC :: jn_wd_i, jn_wd_j, jn_wd_k ! indices at which diagnostic outputs are generated |
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| 57 | |
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| 58 | PUBLIC wad_init ! initialisation routine called by step.F90 |
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| 59 | PUBLIC wad_lmt ! routine called by sshwzv.F90 |
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| 60 | PUBLIC wad_lmt_bt ! routine called by dynspg_ts.F90 |
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| 61 | |
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| 62 | !! * Substitutions |
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| 63 | # include "vectopt_loop_substitute.h90" |
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| 64 | CONTAINS |
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| 65 | |
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| 66 | SUBROUTINE wad_init |
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| 67 | !!---------------------------------------------------------------------- |
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| 68 | !! *** ROUTINE wad_init *** |
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| 69 | !! |
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| 70 | !! ** Purpose : read wetting and drying namelist and print the variables. |
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| 71 | !! |
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| 72 | !! ** input : - namwad namelist |
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| 73 | !!---------------------------------------------------------------------- |
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| 74 | NAMELIST/namwad/ ln_wd, ln_rwd, rn_wdmin0, ln_rwd, rn_wdmin1, rn_wdmin2, rn_wdld, nn_wdit, ln_wd_diag, ln_rwd_bc, & |
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[8544] | 75 | & rn_ht_0, jn_wd_i, jn_wd_j, jn_wd_k,ln_rwd_rmp |
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[8403] | 76 | |
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| 77 | INTEGER :: ios ! Local integer output status for namelist read |
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| 78 | INTEGER :: ierr ! Local integer status array allocation |
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| 79 | !!---------------------------------------------------------------------- |
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| 80 | |
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| 81 | REWIND( numnam_ref ) ! Namelist namwad in reference namelist |
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| 82 | ! : Parameters for Wetting/Drying |
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| 83 | READ ( numnam_ref, namwad, IOSTAT = ios, ERR = 905) |
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| 84 | 905 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namwad in reference namelist', .TRUE.) |
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| 85 | REWIND( numnam_cfg ) ! Namelist namwad in configuration namelist |
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| 86 | ! : Parameters for Wetting/Drying |
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| 87 | READ ( numnam_cfg, namwad, IOSTAT = ios, ERR = 906) |
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| 88 | 906 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namwad in configuration namelist', .TRUE. ) |
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| 89 | IF(lwm) WRITE ( numond, namwad ) |
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| 90 | |
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| 91 | IF(lwp) THEN ! control print |
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| 92 | WRITE(numout,*) |
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| 93 | WRITE(numout,*) 'wad_init : Wetting and drying initialization through namelist read' |
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| 94 | WRITE(numout,*) '~~~~~~~~' |
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| 95 | WRITE(numout,*) ' Namelist namwad' |
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| 96 | WRITE(numout,*) ' Logical for NOC wd scheme ln_wd = ', ln_wd |
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| 97 | WRITE(numout,*) ' Logical for ROMS wd scheme ln_rwd = ', ln_rwd |
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| 98 | WRITE(numout,*) ' Depth at which wet/drying starts rn_wdmin0 = ', rn_wdmin0 |
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| 99 | WRITE(numout,*) ' Minimum wet depth on dried cells rn_wdmin1 = ', rn_wdmin1 |
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| 100 | WRITE(numout,*) ' Tolerance of min wet depth rn_wdmin2 = ', rn_wdmin2 |
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| 101 | WRITE(numout,*) ' land elevation threshold rn_wdld = ', rn_wdld |
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| 102 | WRITE(numout,*) ' Max iteration for W/D limiter nn_wdit = ', nn_wdit |
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| 103 | WRITE(numout,*) ' Logical for WAD diagnostics ln_wd_diag = ', ln_wd_diag |
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| 104 | WRITE(numout,*) ' T => baroclinic u,v = 0 at dry pts: ln_rwd_bc = ', ln_rwd_bc |
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| 105 | WRITE(numout,*) ' use a ramp for rwd limiter: ln_rwd_rmp = ', ln_rwd_rmp |
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| 106 | WRITE(numout,*) ' the height (z) at which ht_0 = 0:rn_ht_0 = ', rn_ht_0 |
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| 107 | WRITE(numout,*) ' i-index for diagnostic point jn_wd_i = ', jn_wd_i |
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| 108 | WRITE(numout,*) ' j-index for diagnostic point jn_wd_j = ', jn_wd_j |
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| 109 | WRITE(numout,*) ' k-index for diagnostic point jn_wd_k = ', jn_wd_k |
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| 110 | ENDIF |
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| 111 | ! |
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| 112 | IF(ln_wd .OR. ln_rwd) THEN |
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| 113 | ALLOCATE( wdmask(jpi,jpj), ht_wd(jpi,jpj), STAT=ierr ) |
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| 114 | ALLOCATE( wdramp(jpi,jpj), wdrampu(jpi,jpj), wdrampv(jpi,jpj), STAT=ierr ) |
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| 115 | IF( ierr /= 0 ) CALL ctl_stop('STOP', 'wad_init : Array allocation error') |
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| 116 | ENDIF |
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| 117 | ! |
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| 118 | END SUBROUTINE wad_init |
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| 119 | |
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| 120 | |
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| 121 | SUBROUTINE wad_lmt( sshb1, sshemp, z2dt ) |
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| 122 | !!---------------------------------------------------------------------- |
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| 123 | !! *** ROUTINE wad_lmt *** |
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| 124 | !! |
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| 125 | !! ** Purpose : generate flux limiters for wetting/drying |
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| 126 | !! |
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| 127 | !! ** Method : - Prevent negative depth occurring (Not ready for Agrif) |
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| 128 | !! |
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| 129 | !! ** Action : - calculate flux limiter and W/D flag |
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| 130 | !!---------------------------------------------------------------------- |
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| 131 | REAL(wp), DIMENSION(:,:), INTENT(inout) :: sshb1 |
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| 132 | REAL(wp), DIMENSION(:,:), INTENT(in) :: sshemp |
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| 133 | REAL(wp), INTENT(in) :: z2dt |
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| 134 | ! |
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| 135 | INTEGER :: ji, jj, jk, jk1 ! dummy loop indices |
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| 136 | INTEGER :: jflag ! local scalar |
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| 137 | REAL(wp) :: zcoef, zdep1, zdep2 ! local scalars |
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| 138 | REAL(wp) :: zzflxp, zzflxn ! local scalars |
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| 139 | REAL(wp) :: zdepwd ! local scalar, always wet cell depth |
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| 140 | REAL(wp) :: ztmp ! local scalars |
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| 141 | REAL(wp), POINTER, DIMENSION(:,:) :: zwdlmtu, zwdlmtv !: W/D flux limiters |
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| 142 | REAL(wp), POINTER, DIMENSION(:,:) :: zflxp, zflxn ! local 2D workspace |
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| 143 | REAL(wp), POINTER, DIMENSION(:,:) :: zflxu, zflxv ! local 2D workspace |
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| 144 | REAL(wp), POINTER, DIMENSION(:,:) :: zflxu1, zflxv1 ! local 2D workspace |
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| 145 | !!---------------------------------------------------------------------- |
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| 146 | ! |
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| 147 | |
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| 148 | IF( nn_timing == 1 ) CALL timing_start('wad_lmt') |
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| 149 | |
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| 150 | IF(ln_wd) THEN |
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| 151 | |
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| 152 | CALL wrk_alloc( jpi, jpj, zflxp, zflxn, zflxu, zflxv, zflxu1, zflxv1 ) |
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| 153 | CALL wrk_alloc( jpi, jpj, zwdlmtu, zwdlmtv) |
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| 154 | ! |
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| 155 | |
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| 156 | !IF(lwp) WRITE(numout,*) |
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| 157 | !IF(lwp) WRITE(numout,*) 'wad_lmt : wetting/drying limiters and velocity limiting' |
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| 158 | |
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| 159 | jflag = 0 |
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| 160 | zdepwd = 50._wp !maximum depth on which that W/D could possibly happen |
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| 161 | |
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| 162 | |
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| 163 | zflxp(:,:) = 0._wp |
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| 164 | zflxn(:,:) = 0._wp |
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| 165 | zflxu(:,:) = 0._wp |
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| 166 | zflxv(:,:) = 0._wp |
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| 167 | |
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| 168 | zwdlmtu(:,:) = 1._wp |
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| 169 | zwdlmtv(:,:) = 1._wp |
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| 170 | |
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| 171 | ! Horizontal Flux in u and v direction |
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| 172 | DO jk = 1, jpkm1 |
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| 173 | DO jj = 1, jpj |
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| 174 | DO ji = 1, jpi |
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| 175 | zflxu(ji,jj) = zflxu(ji,jj) + e3u_n(ji,jj,jk) * un(ji,jj,jk) * umask(ji,jj,jk) |
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| 176 | zflxv(ji,jj) = zflxv(ji,jj) + e3v_n(ji,jj,jk) * vn(ji,jj,jk) * vmask(ji,jj,jk) |
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| 177 | END DO |
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| 178 | END DO |
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| 179 | END DO |
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| 180 | |
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| 181 | zflxu(:,:) = zflxu(:,:) * e2u(:,:) |
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| 182 | zflxv(:,:) = zflxv(:,:) * e1v(:,:) |
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| 183 | |
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| 184 | wdmask(:,:) = 1 |
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| 185 | DO jj = 2, jpj |
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| 186 | DO ji = 2, jpi |
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| 187 | |
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| 188 | IF( tmask(ji, jj, 1) < 0.5_wp ) CYCLE ! we don't care about land cells |
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[8544] | 189 | IF( ht_0(ji,jj)-rn_ssh_ref > zdepwd ) CYCLE ! and cells which are unlikely to dry |
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[8403] | 190 | |
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| 191 | zflxp(ji,jj) = max(zflxu(ji,jj), 0._wp) - min(zflxu(ji-1,jj), 0._wp) + & |
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| 192 | & max(zflxv(ji,jj), 0._wp) - min(zflxv(ji, jj-1), 0._wp) |
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| 193 | zflxn(ji,jj) = min(zflxu(ji,jj), 0._wp) - max(zflxu(ji-1,jj), 0._wp) + & |
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| 194 | & min(zflxv(ji,jj), 0._wp) - max(zflxv(ji, jj-1), 0._wp) |
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| 195 | |
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[8544] | 196 | zdep2 = ht_0(ji,jj) + sshb1(ji,jj) - rn_wdmin1 |
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[8403] | 197 | IF(zdep2 .le. 0._wp) THEN !add more safty, but not necessary |
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[8544] | 198 | sshb1(ji,jj) = rn_wdmin1 - ht_0(ji,jj) |
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[8403] | 199 | IF(zflxu(ji, jj) > 0._wp) zwdlmtu(ji ,jj) = 0._wp |
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| 200 | IF(zflxu(ji-1,jj) < 0._wp) zwdlmtu(ji-1,jj) = 0._wp |
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| 201 | IF(zflxv(ji, jj) > 0._wp) zwdlmtv(ji ,jj) = 0._wp |
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| 202 | IF(zflxv(ji,jj-1) < 0._wp) zwdlmtv(ji,jj-1) = 0._wp |
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| 203 | wdmask(ji,jj) = 0._wp |
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| 204 | END IF |
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| 205 | ENDDO |
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| 206 | END DO |
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| 207 | |
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| 208 | |
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| 209 | ! slwa |
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| 210 | ! HPG limiter from jholt |
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[8544] | 211 | wdramp(:,:) = min((ht_0(:,:) + sshb1(:,:) - rn_wdmin1)/(rn_wdmin0 - rn_wdmin1),1.0_wp) |
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[8403] | 212 | ! write(6,*)'wdramp ',wdramp(10,10),wdramp(10,11) |
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| 213 | !jth assume don't need a lbc_lnk here |
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| 214 | DO jj = 1, jpjm1 |
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| 215 | DO ji = 1, jpim1 |
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| 216 | wdrampu(ji,jj) = min(wdramp(ji,jj),wdramp(ji+1,jj)) |
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| 217 | wdrampv(ji,jj) = min(wdramp(ji,jj),wdramp(ji,jj+1)) |
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| 218 | ENDDO |
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| 219 | ENDDO |
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| 220 | !wdrampu(:,:)=1.0_wp |
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| 221 | !wdrampv(:,:)=1.0_wp |
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| 222 | ! end HPG limiter |
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| 223 | |
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| 224 | |
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| 225 | |
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| 226 | !! start limiter iterations |
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| 227 | DO jk1 = 1, nn_wdit + 1 |
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| 228 | |
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| 229 | |
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| 230 | zflxu1(:,:) = zflxu(:,:) * zwdlmtu(:,:) |
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| 231 | zflxv1(:,:) = zflxv(:,:) * zwdlmtv(:,:) |
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| 232 | jflag = 0 ! flag indicating if any further iterations are needed |
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| 233 | |
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| 234 | DO jj = 2, jpj |
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| 235 | DO ji = 2, jpi |
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| 236 | |
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| 237 | IF( tmask(ji, jj, 1) < 0.5_wp ) CYCLE |
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[8544] | 238 | IF( ht_0(ji,jj) > zdepwd ) CYCLE |
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[8403] | 239 | |
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| 240 | ztmp = e1e2t(ji,jj) |
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| 241 | |
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| 242 | zzflxp = max(zflxu1(ji,jj), 0._wp) - min(zflxu1(ji-1,jj), 0._wp) + & |
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| 243 | & max(zflxv1(ji,jj), 0._wp) - min(zflxv1(ji, jj-1), 0._wp) |
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| 244 | zzflxn = min(zflxu1(ji,jj), 0._wp) - max(zflxu1(ji-1,jj), 0._wp) + & |
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| 245 | & min(zflxv1(ji,jj), 0._wp) - max(zflxv1(ji, jj-1), 0._wp) |
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| 246 | |
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| 247 | zdep1 = (zzflxp + zzflxn) * z2dt / ztmp |
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[8544] | 248 | zdep2 = ht_0(ji,jj) + sshb1(ji,jj) - rn_wdmin1 - z2dt * sshemp(ji,jj) |
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[8403] | 249 | |
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| 250 | IF( zdep1 > zdep2 ) THEN |
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| 251 | wdmask(ji, jj) = 0 |
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| 252 | zcoef = ( ( zdep2 - rn_wdmin2 ) * ztmp - zzflxn * z2dt ) / ( zflxp(ji,jj) * z2dt ) |
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| 253 | !zcoef = ( ( zdep2 - rn_wdmin2 ) * ztmp - zzflxn * z2dt ) / ( zzflxp * z2dt ) |
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| 254 | ! flag if the limiter has been used but stop flagging if the only |
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| 255 | ! changes have zeroed the coefficient since further iterations will |
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| 256 | ! not change anything |
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| 257 | IF( zcoef > 0._wp ) THEN |
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| 258 | jflag = 1 |
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| 259 | ELSE |
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| 260 | zcoef = 0._wp |
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| 261 | ENDIF |
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| 262 | IF(jk1 > nn_wdit) zcoef = 0._wp |
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| 263 | IF(zflxu1(ji, jj) > 0._wp) zwdlmtu(ji ,jj) = zcoef |
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| 264 | IF(zflxu1(ji-1,jj) < 0._wp) zwdlmtu(ji-1,jj) = zcoef |
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| 265 | IF(zflxv1(ji, jj) > 0._wp) zwdlmtv(ji ,jj) = zcoef |
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| 266 | IF(zflxv1(ji,jj-1) < 0._wp) zwdlmtv(ji,jj-1) = zcoef |
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| 267 | END IF |
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| 268 | END DO ! ji loop |
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| 269 | END DO ! jj loop |
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| 270 | |
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| 271 | CALL lbc_lnk( zwdlmtu, 'U', 1. ) |
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| 272 | CALL lbc_lnk( zwdlmtv, 'V', 1. ) |
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| 273 | |
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| 274 | IF(lk_mpp) CALL mpp_max(jflag) !max over the global domain |
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| 275 | |
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| 276 | IF(jflag == 0) EXIT |
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| 277 | |
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| 278 | END DO ! jk1 loop |
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| 279 | |
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| 280 | DO jk = 1, jpkm1 |
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| 281 | un(:,:,jk) = un(:,:,jk) * zwdlmtu(:, :) |
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| 282 | vn(:,:,jk) = vn(:,:,jk) * zwdlmtv(:, :) |
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| 283 | END DO |
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| 284 | |
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| 285 | CALL lbc_lnk( un, 'U', -1. ) |
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| 286 | CALL lbc_lnk( vn, 'V', -1. ) |
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| 287 | ! |
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| 288 | un_b(:,:) = un_b(:,:) * zwdlmtu(:, :) |
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| 289 | vn_b(:,:) = vn_b(:,:) * zwdlmtv(:, :) |
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| 290 | CALL lbc_lnk( un_b, 'U', -1. ) |
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| 291 | CALL lbc_lnk( vn_b, 'V', -1. ) |
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| 292 | |
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| 293 | IF(jflag == 1 .AND. lwp) WRITE(numout,*) 'Need more iterations in wad_lmt!!!' |
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| 294 | |
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| 295 | !IF( ln_rnf ) CALL sbc_rnf_div( hdivn ) ! runoffs (update hdivn field) |
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| 296 | !IF( nn_cla == 1 ) CALL cla_div ( kt ) ! Cross Land Advection (update hdivn field) |
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| 297 | ! |
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| 298 | ! |
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| 299 | CALL wrk_dealloc( jpi, jpj, zflxp, zflxn, zflxu, zflxv, zflxu1, zflxv1 ) |
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| 300 | CALL wrk_dealloc( jpi, jpj, zwdlmtu, zwdlmtv) |
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| 301 | ! |
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| 302 | ENDIF |
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| 303 | ! |
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| 304 | IF( nn_timing == 1 ) CALL timing_stop('wad_lmt') |
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| 305 | ! |
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| 306 | END SUBROUTINE wad_lmt |
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| 307 | |
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| 308 | |
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| 309 | SUBROUTINE wad_lmt_bt( zflxu, zflxv, sshn_e, zssh_frc, rdtbt ) |
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| 310 | !!---------------------------------------------------------------------- |
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| 311 | !! *** ROUTINE wad_lmt *** |
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| 312 | !! |
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| 313 | !! ** Purpose : limiting flux in the barotropic stepping (dynspg_ts) |
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| 314 | !! |
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| 315 | !! ** Method : - Prevent negative depth occurring (Not ready for Agrif) |
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| 316 | !! |
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| 317 | !! ** Action : - calculate flux limiter and W/D flag |
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| 318 | !!---------------------------------------------------------------------- |
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| 319 | REAL(wp), INTENT(in) :: rdtbt ! ocean time-step index |
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| 320 | REAL(wp), DIMENSION(:,:), INTENT(inout) :: zflxu, zflxv, sshn_e, zssh_frc |
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| 321 | ! |
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| 322 | INTEGER :: ji, jj, jk, jk1 ! dummy loop indices |
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| 323 | INTEGER :: jflag ! local scalar |
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| 324 | REAL(wp) :: z2dt |
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| 325 | REAL(wp) :: zcoef, zdep1, zdep2 ! local scalars |
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| 326 | REAL(wp) :: zzflxp, zzflxn ! local scalars |
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| 327 | REAL(wp) :: zdepwd ! local scalar, always wet cell depth |
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| 328 | REAL(wp) :: ztmp ! local scalars |
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| 329 | REAL(wp), POINTER, DIMENSION(:,:) :: zwdlmtu, zwdlmtv !: W/D flux limiters |
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| 330 | REAL(wp), POINTER, DIMENSION(:,:) :: zflxp, zflxn ! local 2D workspace |
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| 331 | REAL(wp), POINTER, DIMENSION(:,:) :: zflxu1, zflxv1 ! local 2D workspace |
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| 332 | !!---------------------------------------------------------------------- |
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| 333 | ! |
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| 334 | IF( nn_timing == 1 ) CALL timing_start('wad_lmt_bt') |
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| 335 | |
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| 336 | IF(ln_wd) THEN |
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| 337 | |
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| 338 | CALL wrk_alloc( jpi, jpj, zflxp, zflxn, zflxu1, zflxv1 ) |
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| 339 | CALL wrk_alloc( jpi, jpj, zwdlmtu, zwdlmtv) |
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| 340 | ! |
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| 341 | |
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| 342 | !IF(lwp) WRITE(numout,*) |
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| 343 | !IF(lwp) WRITE(numout,*) 'wad_lmt_bt : wetting/drying limiters and velocity limiting' |
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| 344 | |
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| 345 | jflag = 0 |
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| 346 | zdepwd = 50._wp !maximum depth that ocean cells can have W/D processes |
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| 347 | |
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| 348 | z2dt = rdtbt |
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| 349 | |
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| 350 | zflxp(:,:) = 0._wp |
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| 351 | zflxn(:,:) = 0._wp |
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| 352 | |
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| 353 | zwdlmtu(:,:) = 1._wp |
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| 354 | zwdlmtv(:,:) = 1._wp |
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| 355 | |
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| 356 | ! Horizontal Flux in u and v direction |
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| 357 | |
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| 358 | DO jj = 2, jpj |
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| 359 | DO ji = 2, jpi |
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| 360 | |
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| 361 | IF( tmask(ji, jj, 1 ) < 0.5_wp) CYCLE ! we don't care about land cells |
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[8544] | 362 | IF( ht_0(ji,jj) > zdepwd ) CYCLE ! and cells which are unlikely to dry |
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[8403] | 363 | |
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| 364 | zflxp(ji,jj) = max(zflxu(ji,jj), 0._wp) - min(zflxu(ji-1,jj), 0._wp) + & |
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| 365 | & max(zflxv(ji,jj), 0._wp) - min(zflxv(ji, jj-1), 0._wp) |
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| 366 | zflxn(ji,jj) = min(zflxu(ji,jj), 0._wp) - max(zflxu(ji-1,jj), 0._wp) + & |
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| 367 | & min(zflxv(ji,jj), 0._wp) - max(zflxv(ji, jj-1), 0._wp) |
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| 368 | |
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[8544] | 369 | zdep2 = ht_0(ji,jj) + sshn_e(ji,jj) - rn_wdmin1 |
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[8403] | 370 | IF(zdep2 .le. 0._wp) THEN !add more safety, but not necessary |
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[8544] | 371 | sshn_e(ji,jj) = rn_wdmin1 - ht_0(ji,jj) |
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[8403] | 372 | IF(zflxu(ji, jj) > 0._wp) zwdlmtu(ji ,jj) = 0._wp |
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| 373 | IF(zflxu(ji-1,jj) < 0._wp) zwdlmtu(ji-1,jj) = 0._wp |
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| 374 | IF(zflxv(ji, jj) > 0._wp) zwdlmtv(ji ,jj) = 0._wp |
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| 375 | IF(zflxv(ji,jj-1) < 0._wp) zwdlmtv(ji,jj-1) = 0._wp |
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| 376 | END IF |
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| 377 | ENDDO |
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| 378 | END DO |
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| 379 | |
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| 380 | |
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| 381 | !! start limiter iterations |
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| 382 | DO jk1 = 1, nn_wdit + 1 |
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| 383 | |
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| 384 | |
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| 385 | zflxu1(:,:) = zflxu(:,:) * zwdlmtu(:,:) |
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| 386 | zflxv1(:,:) = zflxv(:,:) * zwdlmtv(:,:) |
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| 387 | jflag = 0 ! flag indicating if any further iterations are needed |
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| 388 | |
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| 389 | DO jj = 2, jpj |
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| 390 | DO ji = 2, jpi |
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| 391 | |
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| 392 | IF( tmask(ji, jj, 1 ) < 0.5_wp) CYCLE |
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[8544] | 393 | IF( ht_0(ji,jj) > zdepwd ) CYCLE |
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[8403] | 394 | |
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| 395 | ztmp = e1e2t(ji,jj) |
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| 396 | |
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| 397 | zzflxp = max(zflxu1(ji,jj), 0._wp) - min(zflxu1(ji-1,jj), 0._wp) + & |
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| 398 | & max(zflxv1(ji,jj), 0._wp) - min(zflxv1(ji, jj-1), 0._wp) |
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| 399 | zzflxn = min(zflxu1(ji,jj), 0._wp) - max(zflxu1(ji-1,jj), 0._wp) + & |
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| 400 | & min(zflxv1(ji,jj), 0._wp) - max(zflxv1(ji, jj-1), 0._wp) |
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| 401 | |
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| 402 | zdep1 = (zzflxp + zzflxn) * z2dt / ztmp |
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[8544] | 403 | zdep2 = ht_0(ji,jj) + sshn_e(ji,jj) - rn_wdmin1 - z2dt * zssh_frc(ji,jj) |
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[8403] | 404 | |
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| 405 | IF(zdep1 > zdep2) THEN |
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| 406 | zcoef = ( ( zdep2 - rn_wdmin2 ) * ztmp - zzflxn * z2dt ) / ( zflxp(ji,jj) * z2dt ) |
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| 407 | !zcoef = ( ( zdep2 - rn_wdmin2 ) * ztmp - zzflxn * z2dt ) / ( zzflxp * z2dt ) |
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| 408 | ! flag if the limiter has been used but stop flagging if the only |
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| 409 | ! changes have zeroed the coefficient since further iterations will |
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| 410 | ! not change anything |
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| 411 | IF( zcoef > 0._wp ) THEN |
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| 412 | jflag = 1 |
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| 413 | ELSE |
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| 414 | zcoef = 0._wp |
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| 415 | ENDIF |
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| 416 | IF(jk1 > nn_wdit) zcoef = 0._wp |
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| 417 | IF(zflxu1(ji, jj) > 0._wp) zwdlmtu(ji ,jj) = zcoef |
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| 418 | IF(zflxu1(ji-1,jj) < 0._wp) zwdlmtu(ji-1,jj) = zcoef |
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| 419 | IF(zflxv1(ji, jj) > 0._wp) zwdlmtv(ji ,jj) = zcoef |
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| 420 | IF(zflxv1(ji,jj-1) < 0._wp) zwdlmtv(ji,jj-1) = zcoef |
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| 421 | END IF |
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| 422 | END DO ! ji loop |
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| 423 | END DO ! jj loop |
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| 424 | |
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| 425 | CALL lbc_lnk( zwdlmtu, 'U', 1. ) |
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| 426 | CALL lbc_lnk( zwdlmtv, 'V', 1. ) |
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| 427 | |
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| 428 | IF(lk_mpp) CALL mpp_max(jflag) !max over the global domain |
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| 429 | |
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| 430 | IF(jflag == 0) EXIT |
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| 431 | |
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| 432 | END DO ! jk1 loop |
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| 433 | |
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| 434 | zflxu(:,:) = zflxu(:,:) * zwdlmtu(:, :) |
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| 435 | zflxv(:,:) = zflxv(:,:) * zwdlmtv(:, :) |
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| 436 | |
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| 437 | CALL lbc_lnk( zflxu, 'U', -1. ) |
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| 438 | CALL lbc_lnk( zflxv, 'V', -1. ) |
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| 439 | |
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| 440 | IF(jflag == 1 .AND. lwp) WRITE(numout,*) 'Need more iterations in wad_lmt_bt!!!' |
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| 441 | |
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| 442 | !IF( ln_rnf ) CALL sbc_rnf_div( hdivn ) ! runoffs (update hdivn field) |
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| 443 | !IF( nn_cla == 1 ) CALL cla_div ( kt ) ! Cross Land Advection (update hdivn field) |
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| 444 | ! |
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| 445 | ! |
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| 446 | CALL wrk_dealloc( jpi, jpj, zflxp, zflxn, zflxu1, zflxv1 ) |
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| 447 | CALL wrk_dealloc( jpi, jpj, zwdlmtu, zwdlmtv) |
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| 448 | ! |
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| 449 | END IF |
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| 450 | |
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| 451 | IF( nn_timing == 1 ) CALL timing_stop('wad_lmt') |
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| 452 | END SUBROUTINE wad_lmt_bt |
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| 453 | |
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| 454 | !!============================================================================== |
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| 455 | END MODULE wet_dry |
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