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dynspg_exp.F90 in NEMO/branches/2019/ENHANCE-02_ISF_nemo/src/OCE/DYN – NEMO

source: NEMO/branches/2019/ENHANCE-02_ISF_nemo/src/OCE/DYN/dynspg_exp.F90 @ 11987

Last change on this file since 11987 was 10068, checked in by nicolasmartin, 6 years ago

First part of modifications to have a common default header : fix typos and SVN keywords properties

  • Property svn:keywords set to Id
File size: 4.3 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
26   IMPLICIT NONE
27   PRIVATE
28
29   PUBLIC   dyn_spg_exp   ! called in dynspg.F90
30
31   !! * Substitutions
32#  include "vectopt_loop_substitute.h90"
33   !!----------------------------------------------------------------------
34   !! NEMO/OCE 4.0 , NEMO Consortium (2018)
35   !! $Id$
36   !! Software governed by the CeCILL license (see ./LICENSE)
37   !!----------------------------------------------------------------------
38CONTAINS
39
40   SUBROUTINE dyn_spg_exp( kt )
41      !!----------------------------------------------------------------------
42      !!                  ***  routine dyn_spg_exp  ***
43      !!
44      !! ** Purpose :   Compute the now trend due to the surface pressure
45      !!              gradient in case of explicit free surface formulation and
46      !!              add it to the general trend of momentum equation.
47      !!
48      !! ** Method  :   Explicit free surface formulation. Add to the general
49      !!              momentum trend the surface pressure gradient :
50      !!                      (ua,va) = (ua,va) + (spgu,spgv)
51      !!              where spgu = -1/rau0 d/dx(ps) = -g/e1u di( sshn )
52      !!                    spgv = -1/rau0 d/dy(ps) = -g/e2v dj( sshn )
53      !!
54      !! ** Action :   (ua,va)   trend of horizontal velocity increased by
55      !!                         the surf. pressure gradient trend
56      !!---------------------------------------------------------------------
57      INTEGER, INTENT(in)  ::   kt   ! ocean time-step index
58      !!
59      INTEGER ::   ji, jj, jk   ! dummy loop indices
60      !!----------------------------------------------------------------------
61      !
62      IF( kt == nit000 ) THEN
63         IF(lwp) WRITE(numout,*)
64         IF(lwp) WRITE(numout,*) 'dyn_spg_exp : surface pressure gradient trend'
65         IF(lwp) WRITE(numout,*) '~~~~~~~~~~~   (explicit free surface)'
66         !
67         spgu(:,:) = 0._wp   ;   spgv(:,:) = 0._wp
68         !
69         IF( .NOT.ln_linssh .AND. lwp ) WRITE(numout,*) '      non linear free surface: spg is included in dynhpg'
70      ENDIF
71
72      IF( ln_linssh ) THEN          !* linear free surface : add the surface pressure gradient trend
73         !
74         DO jj = 2, jpjm1                    ! now surface pressure gradient
75            DO ji = fs_2, fs_jpim1   ! vector opt.
76               spgu(ji,jj) = - grav * ( sshn(ji+1,jj) - sshn(ji,jj) ) * r1_e1u(ji,jj)
77               spgv(ji,jj) = - grav * ( sshn(ji,jj+1) - sshn(ji,jj) ) * r1_e2v(ji,jj)
78            END DO
79         END DO
80         !
81         DO jk = 1, jpkm1                    ! Add it to the general trend
82            DO jj = 2, jpjm1
83               DO ji = fs_2, fs_jpim1   ! vector opt.
84                  ua(ji,jj,jk) = ua(ji,jj,jk) + spgu(ji,jj)
85                  va(ji,jj,jk) = va(ji,jj,jk) + spgv(ji,jj)
86               END DO
87            END DO
88         END DO
89         !
90      ENDIF
91      !
92   END SUBROUTINE dyn_spg_exp
93
94   !!======================================================================
95END MODULE dynspg_exp
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