[911] | 1 | MODULE bdyvol |
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[1125] | 2 | !!====================================================================== |
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[911] | 3 | !! *** MODULE bdyvol *** |
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| 4 | !! Ocean dynamic : Volume constraint when unstructured boundary |
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[3294] | 5 | !! and filtered free surface are used |
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[1125] | 6 | !!====================================================================== |
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| 7 | !! History : 1.0 ! 2005-01 (J. Chanut, A. Sellar) Original code |
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| 8 | !! - ! 2006-01 (J. Chanut) Bug correction |
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| 9 | !! 3.0 ! 2008-04 (NEMO team) add in the reference version |
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[3294] | 10 | !! 3.4 ! 2011 (D. Storkey) rewrite in preparation for OBC-BDY merge |
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[1125] | 11 | !!---------------------------------------------------------------------- |
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[911] | 12 | #if defined key_bdy && defined key_dynspg_flt |
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[1125] | 13 | !!---------------------------------------------------------------------- |
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[2528] | 14 | !! 'key_bdy' AND unstructured open boundary conditions |
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[1125] | 15 | !! 'key_dynspg_flt' filtered free surface |
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| 16 | !!---------------------------------------------------------------------- |
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[3294] | 17 | USE timing ! Timing |
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[911] | 18 | USE oce ! ocean dynamics and tracers |
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| 19 | USE dom_oce ! ocean space and time domain |
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| 20 | USE phycst ! physical constants |
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| 21 | USE bdy_oce ! ocean open boundary conditions |
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| 22 | USE lib_mpp ! for mppsum |
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| 23 | USE in_out_manager ! I/O manager |
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| 24 | USE sbc_oce ! ocean surface boundary conditions |
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| 25 | |
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| 26 | IMPLICIT NONE |
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| 27 | PRIVATE |
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| 28 | |
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| 29 | PUBLIC bdy_vol ! routine called by dynspg_flt.h90 |
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| 30 | |
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| 31 | !! * Substitutions |
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| 32 | # include "domzgr_substitute.h90" |
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[1125] | 33 | !!---------------------------------------------------------------------- |
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[2528] | 34 | !! NEMO/OPA 3.3 , NEMO Consortium (2010) |
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[1146] | 35 | !! $Id$ |
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[2528] | 36 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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[1125] | 37 | !!---------------------------------------------------------------------- |
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[911] | 38 | CONTAINS |
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| 39 | |
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[1125] | 40 | SUBROUTINE bdy_vol( kt ) |
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| 41 | !!---------------------------------------------------------------------- |
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[911] | 42 | !! *** ROUTINE bdyvol *** |
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| 43 | !! |
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[1125] | 44 | !! ** Purpose : This routine is called in dynspg_flt to control |
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[911] | 45 | !! the volume of the system. A correction velocity is calculated |
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| 46 | !! to correct the total transport through the unstructured OBC. |
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| 47 | !! The total depth used is constant (H0) to be consistent with the |
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| 48 | !! linear free surface coded in OPA 8.2 |
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| 49 | !! |
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[1125] | 50 | !! ** Method : The correction velocity (zubtpecor here) is defined calculating |
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[911] | 51 | !! the total transport through all open boundaries (trans_bdy) minus |
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[1125] | 52 | !! the cumulate E-P flux (z_cflxemp) divided by the total lateral |
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[911] | 53 | !! surface (bdysurftot) of the unstructured boundary. |
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[1125] | 54 | !! zubtpecor = [trans_bdy - z_cflxemp ]*(1./bdysurftot) |
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| 55 | !! with z_cflxemp => sum of (Evaporation minus Precipitation) |
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[911] | 56 | !! over all the domain in m3/s at each time step. |
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[1125] | 57 | !! z_cflxemp < 0 when precipitation dominate |
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| 58 | !! z_cflxemp > 0 when evaporation dominate |
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[911] | 59 | !! |
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| 60 | !! There are 2 options (user's desiderata): |
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| 61 | !! 1/ The volume changes according to E-P, this is the default |
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| 62 | !! option. In this case the cumulate E-P flux are setting to |
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[1125] | 63 | !! zero (z_cflxemp=0) to calculate the correction velocity. So |
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[911] | 64 | !! it will only balance the flux through open boundaries. |
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[2528] | 65 | !! (set nn_volctl to 0 in tne namelist for this option) |
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[911] | 66 | !! 2/ The volume is constant even with E-P flux. In this case |
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| 67 | !! the correction velocity must balance both the flux |
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| 68 | !! through open boundaries and the ones through the free |
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| 69 | !! surface. |
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[2528] | 70 | !! (set nn_volctl to 1 in tne namelist for this option) |
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[1125] | 71 | !!---------------------------------------------------------------------- |
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| 72 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
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[911] | 73 | !! |
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[1125] | 74 | INTEGER :: ji, jj, jk, jb, jgrd |
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[3294] | 75 | INTEGER :: ib_bdy, ii, ij |
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[2528] | 76 | REAL(wp) :: zubtpecor, z_cflxemp, ztranst |
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[3294] | 77 | TYPE(OBC_INDEX), POINTER :: idx |
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[911] | 78 | !!----------------------------------------------------------------------------- |
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| 79 | |
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[3294] | 80 | IF( nn_timing == 1 ) CALL timing_start('bdy_vol') |
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| 81 | |
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[2528] | 82 | IF( ln_vol ) THEN |
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| 83 | |
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[911] | 84 | IF( kt == nit000 ) THEN |
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[1125] | 85 | IF(lwp) WRITE(numout,*) |
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[911] | 86 | IF(lwp) WRITE(numout,*)'bdy_vol : Correction of velocities along unstructured OBC' |
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| 87 | IF(lwp) WRITE(numout,*)'~~~~~~~' |
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| 88 | END IF |
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| 89 | |
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[1125] | 90 | ! Calculate the cumulate surface Flux z_cflxemp (m3/s) over all the domain |
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| 91 | ! ----------------------------------------------------------------------- |
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[2528] | 92 | z_cflxemp = SUM ( ( emp(:,:)-rnf(:,:) ) * bdytmask(:,:) * e1t(:,:) * e2t(:,:) ) / rau0 |
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| 93 | IF( lk_mpp ) CALL mpp_sum( z_cflxemp ) ! sum over the global domain |
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[911] | 94 | |
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[2528] | 95 | ! Transport through the unstructured open boundary |
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| 96 | ! ------------------------------------------------ |
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[911] | 97 | zubtpecor = 0.e0 |
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[3294] | 98 | DO ib_bdy = 1, nb_bdy |
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| 99 | idx => idx_bdy(ib_bdy) |
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| 100 | |
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| 101 | jgrd = 2 ! cumulate u component contribution first |
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| 102 | DO jb = 1, idx%nblenrim(jgrd) |
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| 103 | DO jk = 1, jpkm1 |
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| 104 | ii = idx%nbi(jb,jgrd) |
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| 105 | ij = idx%nbj(jb,jgrd) |
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[4292] | 106 | zubtpecor = zubtpecor + idx%flagu(jb,jgrd) * ua(ii,ij, jk) * e2u(ii,ij) * fse3u(ii,ij,jk) |
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[3294] | 107 | END DO |
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[1125] | 108 | END DO |
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[3294] | 109 | jgrd = 3 ! then add v component contribution |
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| 110 | DO jb = 1, idx%nblenrim(jgrd) |
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| 111 | DO jk = 1, jpkm1 |
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| 112 | ii = idx%nbi(jb,jgrd) |
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| 113 | ij = idx%nbj(jb,jgrd) |
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[4292] | 114 | zubtpecor = zubtpecor + idx%flagv(jb,jgrd) * va(ii,ij, jk) * e1v(ii,ij) * fse3v(ii,ij,jk) |
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[3294] | 115 | END DO |
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[1125] | 116 | END DO |
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[3294] | 117 | |
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[911] | 118 | END DO |
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| 119 | IF( lk_mpp ) CALL mpp_sum( zubtpecor ) ! sum over the global domain |
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| 120 | |
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[1125] | 121 | ! The normal velocity correction |
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| 122 | ! ------------------------------ |
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[2528] | 123 | IF( nn_volctl==1 ) THEN ; zubtpecor = ( zubtpecor - z_cflxemp) / bdysurftot |
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| 124 | ELSE ; zubtpecor = zubtpecor / bdysurftot |
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[911] | 125 | END IF |
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| 126 | |
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[1125] | 127 | ! Correction of the total velocity on the unstructured boundary to respect the mass flux conservation |
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| 128 | ! ------------------------------------------------------------- |
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[911] | 129 | ztranst = 0.e0 |
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[3294] | 130 | DO ib_bdy = 1, nb_bdy |
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| 131 | idx => idx_bdy(ib_bdy) |
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| 132 | |
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| 133 | jgrd = 2 ! correct u component |
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| 134 | DO jb = 1, idx%nblenrim(jgrd) |
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| 135 | DO jk = 1, jpkm1 |
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| 136 | ii = idx%nbi(jb,jgrd) |
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| 137 | ij = idx%nbj(jb,jgrd) |
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[4292] | 138 | ua(ii,ij,jk) = ua(ii,ij,jk) - idx%flagu(jb,jgrd) * zubtpecor * umask(ii,ij,jk) |
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| 139 | ztranst = ztranst + idx%flagu(jb,jgrd) * ua(ii,ij,jk) * e2u(ii,ij) * fse3u(ii,ij,jk) |
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[3294] | 140 | END DO |
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[1125] | 141 | END DO |
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[3294] | 142 | jgrd = 3 ! correct v component |
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| 143 | DO jb = 1, idx%nblenrim(jgrd) |
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| 144 | DO jk = 1, jpkm1 |
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| 145 | ii = idx%nbi(jb,jgrd) |
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| 146 | ij = idx%nbj(jb,jgrd) |
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[4292] | 147 | va(ii,ij,jk) = va(ii,ij,jk) -idx%flagv(jb,jgrd) * zubtpecor * vmask(ii,ij,jk) |
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| 148 | ztranst = ztranst + idx%flagv(jb,jgrd) * va(ii,ij,jk) * e1v(ii,ij) * fse3v(ii,ij,jk) |
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[3294] | 149 | END DO |
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[1125] | 150 | END DO |
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[3294] | 151 | |
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[911] | 152 | END DO |
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| 153 | IF( lk_mpp ) CALL mpp_sum( ztranst ) ! sum over the global domain |
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| 154 | |
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[1125] | 155 | ! Check the cumulated transport through unstructured OBC once barotropic velocities corrected |
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| 156 | ! ------------------------------------------------------ |
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[911] | 157 | IF( lwp .AND. MOD( kt, nwrite ) == 0) THEN |
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[1125] | 158 | IF(lwp) WRITE(numout,*) |
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| 159 | IF(lwp) WRITE(numout,*)'bdy_vol : time step :', kt |
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| 160 | IF(lwp) WRITE(numout,*)'~~~~~~~ ' |
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| 161 | IF(lwp) WRITE(numout,*)' cumulate flux EMP =', z_cflxemp , ' (m3/s)' |
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| 162 | IF(lwp) WRITE(numout,*)' total lateral surface of OBC =', bdysurftot, '(m2)' |
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| 163 | IF(lwp) WRITE(numout,*)' correction velocity zubtpecor =', zubtpecor , '(m/s)' |
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| 164 | IF(lwp) WRITE(numout,*)' cumulated transport ztranst =', ztranst , '(m3/s)' |
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[911] | 165 | END IF |
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[1125] | 166 | ! |
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[3294] | 167 | IF( nn_timing == 1 ) CALL timing_stop('bdy_vol') |
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| 168 | ! |
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[2528] | 169 | END IF ! ln_vol |
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| 170 | |
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[911] | 171 | END SUBROUTINE bdy_vol |
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| 172 | |
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| 173 | #else |
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[1125] | 174 | !!---------------------------------------------------------------------- |
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| 175 | !! Dummy module NO Unstruct Open Boundary Conditions |
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| 176 | !!---------------------------------------------------------------------- |
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[911] | 177 | CONTAINS |
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[1125] | 178 | SUBROUTINE bdy_vol( kt ) ! Empty routine |
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| 179 | WRITE(*,*) 'bdy_vol: You should not have seen this print! error?', kt |
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[911] | 180 | END SUBROUTINE bdy_vol |
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| 181 | #endif |
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| 182 | |
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[1125] | 183 | !!====================================================================== |
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[911] | 184 | END MODULE bdyvol |
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