| 1 | MODULE dynspg_exp |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE dynspg_exp *** |
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| 4 | !! Ocean dynamics: surface pressure gradient trend, explicit scheme |
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| 5 | !!====================================================================== |
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| 6 | !! History : 2.0 ! 2005-11 (V. Garnier, G. Madec, L. Bessieres) Original code |
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| 7 | !! 3.2 ! 2009-06 (G. Madec, M. Leclair, R. Benshila) introduce sshwzv module |
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| 8 | !!---------------------------------------------------------------------- |
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| 9 | |
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| 10 | !!---------------------------------------------------------------------- |
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| 11 | !! dyn_spg_exp : update the momentum trend with the surface |
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| 12 | !! pressure gradient in the free surface constant |
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| 13 | !! volume case with vector optimization |
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| 14 | !!---------------------------------------------------------------------- |
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| 15 | USE oce ! ocean dynamics and tracers |
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| 16 | USE dom_oce ! ocean space and time domain |
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| 17 | USE sbc_oce ! surface boundary condition: ocean |
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| 18 | USE phycst ! physical constants |
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| 19 | ! |
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| 20 | USE in_out_manager ! I/O manager |
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| 21 | USE lib_mpp ! distributed memory computing library |
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| 22 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
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| 23 | USE prtctl ! Print control |
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| 24 | USE iom ! I/O library |
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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 dyn_spg_exp ! called in dynspg.F90 |
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| 30 | |
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| 31 | !! * Substitutions |
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| 32 | # include "vectopt_loop_substitute.h90" |
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| 33 | !!---------------------------------------------------------------------- |
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| 34 | !! NEMO/OCE 4.0 , NEMO Consortium (2018) |
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| 35 | !! $Id$ |
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| 36 | !! Software governed by the CeCILL license (see ./LICENSE) |
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| 37 | !!---------------------------------------------------------------------- |
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| 38 | CONTAINS |
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| 39 | |
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| 40 | SUBROUTINE dyn_spg_exp( kt ) |
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| 41 | !!---------------------------------------------------------------------- |
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| 42 | !! *** routine dyn_spg_exp *** |
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| 43 | !! |
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| 44 | !! ** Purpose : Compute the now trend due to the surface pressure |
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| 45 | !! gradient in case of explicit free surface formulation and |
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| 46 | !! add it to the general trend of momentum equation. |
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| 47 | !! |
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| 48 | !! ** Method : Explicit free surface formulation. Add to the general |
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| 49 | !! momentum trend the surface pressure gradient : |
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| 50 | !! (ua,va) = (ua,va) + (spgu,spgv) |
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| 51 | !! where spgu = -1/rau0 d/dx(ps) = -g/e1u di( sshn ) |
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| 52 | !! spgv = -1/rau0 d/dy(ps) = -g/e2v dj( sshn ) |
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| 53 | !! |
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| 54 | !! ** Action : (ua,va) trend of horizontal velocity increased by |
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| 55 | !! the surf. pressure gradient trend |
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| 56 | !!--------------------------------------------------------------------- |
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| 57 | INTEGER, INTENT(in) :: kt ! ocean time-step index |
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| 58 | !! |
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| 59 | INTEGER :: ji, jj, jk ! dummy loop indices |
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| 60 | !!---------------------------------------------------------------------- |
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| 61 | ! |
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| 62 | IF( kt == nit000 ) THEN |
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| 63 | IF(lwp) THEN |
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| 64 | WRITE(numout,*) |
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| 65 | WRITE(numout,*) 'dyn_spg_exp : surface pressure gradient trend' |
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| 66 | WRITE(numout,*) '~~~~~~~~~~~ (explicit free surface)' |
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| 67 | IF(lflush) CALL FLUSH(numout) |
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| 68 | ENDIF |
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| 69 | ! |
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| 70 | spgu(:,:) = 0._wp ; spgv(:,:) = 0._wp |
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| 71 | ! |
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| 72 | IF( .NOT.ln_linssh .AND. lwp ) THEN |
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| 73 | WRITE(numout,*) ' non linear free surface: spg is included in dynhpg' |
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| 74 | IF(lflush) CALL FLUSH(numout) |
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| 75 | ENDIF |
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| 76 | ENDIF |
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| 77 | |
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| 78 | IF( ln_linssh ) THEN !* linear free surface : add the surface pressure gradient trend |
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| 79 | ! |
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| 80 | DO jj = 2, jpjm1 ! now surface pressure gradient |
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| 81 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 82 | spgu(ji,jj) = - grav * ( sshn(ji+1,jj) - sshn(ji,jj) ) * r1_e1u(ji,jj) |
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| 83 | spgv(ji,jj) = - grav * ( sshn(ji,jj+1) - sshn(ji,jj) ) * r1_e2v(ji,jj) |
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| 84 | END DO |
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| 85 | END DO |
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| 86 | ! |
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| 87 | DO jk = 1, jpkm1 ! Add it to the general trend |
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| 88 | DO jj = 2, jpjm1 |
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| 89 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 90 | ua(ji,jj,jk) = ua(ji,jj,jk) + spgu(ji,jj) |
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| 91 | va(ji,jj,jk) = va(ji,jj,jk) + spgv(ji,jj) |
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| 92 | END DO |
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| 93 | END DO |
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| 94 | END DO |
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| 95 | ! |
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| 96 | ENDIF |
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| 97 | ! |
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| 98 | END SUBROUTINE dyn_spg_exp |
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| 99 | |
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| 100 | !!====================================================================== |
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| 101 | END MODULE dynspg_exp |
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