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dynspg_exp.F90 in branches/2015/dev_r5836_NOC3_vvl_by_default/NEMOGCM/NEMO/OPA_SRC/DYN – NEMO

source: branches/2015/dev_r5836_NOC3_vvl_by_default/NEMOGCM/NEMO/OPA_SRC/DYN/dynspg_exp.F90 @ 6004

Last change on this file since 6004 was 6004, checked in by gm, 8 years ago

#1613: vvl by default, step III: Merge with the trunk (free surface simplification) (see wiki)

  • Property svn:keywords set to Id
File size: 4.5 KB
Line 
1MODULE dynspg_exp
2   !!======================================================================
3   !!                   ***  MODULE  dynspg_exp  ***
4   !! Ocean dynamics:  surface pressure gradient trend, explicit scheme
5   !!======================================================================
6   !! History :  2.0  !  2005-11  (V. Garnier, G. Madec, L. Bessieres) Original code
7   !!            3.2  !  2009-06  (G. Madec, M. Leclair, R. Benshila) introduce sshwzv module
8   !!----------------------------------------------------------------------
9
10   !!----------------------------------------------------------------------
11   !!   dyn_spg_exp  : update the momentum trend with the surface
12   !!                      pressure gradient in the free surface constant 
13   !!                      volume case with vector optimization
14   !!----------------------------------------------------------------------
15   USE oce             ! ocean dynamics and tracers
16   USE dom_oce         ! ocean space and time domain
17   USE sbc_oce         ! surface boundary condition: ocean
18   USE phycst          ! physical constants
19   !
20   USE in_out_manager  ! I/O manager
21   USE lib_mpp         ! distributed memory computing library
22   USE lbclnk          ! ocean lateral boundary conditions (or mpp link)
23   USE prtctl          ! Print control
24   USE iom             ! I/O library
25   USE timing          ! Timing
26
27   IMPLICIT NONE
28   PRIVATE
29
30   PUBLIC   dyn_spg_exp   ! routine called by dynspg.F90
31
32   !! * Substitutions
33#  include "vectopt_loop_substitute.h90"
34   !!----------------------------------------------------------------------
35   !! NEMO/OPA 3.3 , NEMO Consortium (2010)
36   !! $Id$
37   !! Software governed by the CeCILL licence     (NEMOGCM/NEMO_CeCILL.txt)
38   !!----------------------------------------------------------------------
39CONTAINS
40
41   SUBROUTINE dyn_spg_exp( kt )
42      !!----------------------------------------------------------------------
43      !!                  ***  routine dyn_spg_exp  ***
44      !!
45      !! ** Purpose :   Compute the now trend due to the surface pressure
46      !!              gradient in case of explicit free surface formulation and
47      !!              add it to the general trend of momentum equation.
48      !!
49      !! ** Method  :   Explicit free surface formulation. Add to the general
50      !!              momentum trend the surface pressure gradient :
51      !!                      (ua,va) = (ua,va) + (spgu,spgv)
52      !!              where spgu = -1/rau0 d/dx(ps) = -g/e1u di( sshn )
53      !!                    spgv = -1/rau0 d/dy(ps) = -g/e2v dj( sshn )
54      !!
55      !! ** Action :   (ua,va)   trend of horizontal velocity increased by
56      !!                         the surf. pressure gradient trend
57      !!---------------------------------------------------------------------
58      INTEGER, INTENT(in)  ::   kt   ! ocean time-step index
59      !!
60      INTEGER ::   ji, jj, jk   ! dummy loop indices
61      !!----------------------------------------------------------------------
62      !
63      IF( nn_timing == 1 )  CALL timing_start('dyn_spg_exp')
64      !
65      IF( kt == nit000 ) THEN
66         IF(lwp) WRITE(numout,*)
67         IF(lwp) WRITE(numout,*) 'dyn_spg_exp : surface pressure gradient trend'
68         IF(lwp) WRITE(numout,*) '~~~~~~~~~~~   (explicit free surface)'
69         !
70         spgu(:,:) = 0._wp   ;   spgv(:,:) = 0._wp
71         !
72         IF( .NOT.ln_linssh .AND. lwp ) WRITE(numout,*) '      non linear free surface: spg is included in dynhpg'
73      ENDIF
74
75      IF( ln_linssh ) THEN          !* linear free surface : add the surface pressure gradient trend
76         !
77         DO jj = 2, jpjm1                    ! now surface pressure gradient
78            DO ji = fs_2, fs_jpim1   ! vector opt.
79               spgu(ji,jj) = - grav * ( sshn(ji+1,jj) - sshn(ji,jj) ) * r1_e1u(ji,jj)
80               spgv(ji,jj) = - grav * ( sshn(ji,jj+1) - sshn(ji,jj) ) * r1_e2v(ji,jj)
81            END DO
82         END DO
83         !
84         DO jk = 1, jpkm1                    ! Add it to the general trend
85            DO jj = 2, jpjm1
86               DO ji = fs_2, fs_jpim1   ! vector opt.
87                  ua(ji,jj,jk) = ua(ji,jj,jk) + spgu(ji,jj)
88                  va(ji,jj,jk) = va(ji,jj,jk) + spgv(ji,jj)
89               END DO
90            END DO
91         END DO
92         !
93      ENDIF
94      !
95      IF( nn_timing == 1 )  CALL timing_stop('dyn_spg_exp')
96      !
97   END SUBROUTINE dyn_spg_exp
98
99   !!======================================================================
100END MODULE dynspg_exp
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