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bdytides.F90 in trunk/NEMO/OPA_SRC/BDY – NEMO

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source: trunk/NEMO/OPA_SRC/BDY/bdytides.F90 @ 1473

Last change on this file since 1473 was 1462, checked in by rblod, 15 years ago
Bugs in bdytides, see ticket #441
Property svn:executable set to ``* Property svn:keywords set to `Id`
File size: 29.2 KB

Rev	Line
[911]	1	MODULE bdytides
[1125]	2	!!======================================================================
[911]	3	!! * MODULE bdytides *
	4	!! Ocean dynamics: Tidal forcing at open boundaries
[1125]	5	!!======================================================================
	6	!! History : 2.0 ! 2007-01 (D.Storkey) Original code
	7	!! 2.3 ! 2008-01 (J.Holt) Add date correction. Origins POLCOMS v6.3 2007
	8	!! 3.0 ! 2008-04 (NEMO team) add in the reference version
	9	!!----------------------------------------------------------------------
	10	#if defined key_bdy
	11	!!----------------------------------------------------------------------
	12	!! 'key_bdy' Unstructured Open Boundary Condition
	13	!!----------------------------------------------------------------------
[911]	14	!! PUBLIC
[1125]	15	!! tide_init : read of namelist
	16	!! tide_data : read in and initialisation of tidal constituents at boundary
	17	!! tide_update : calculation of tidal forcing at each timestep
[911]	18	!! PRIVATE
[1125]	19	!! uvset :\
	20	!! vday : \| Routines to correct tidal harmonics forcing for
	21	!! shpen : \| start time of integration
	22	!! ufset : \|
	23	!! vset :/
	24	!!----------------------------------------------------------------------
[911]	25	USE oce ! ocean dynamics and tracers
	26	USE dom_oce ! ocean space and time domain
	27	USE iom
	28	USE in_out_manager ! I/O units
	29	USE phycst ! physical constants
	30	USE lbclnk ! ocean lateral boundary conditions (or mpp link)
	31	USE bdy_par ! Unstructured boundary parameters
	32	USE bdy_oce ! ocean open boundary conditions
	33	USE daymod ! calendar
[1125]	34
[911]	35	IMPLICIT NONE
	36	PRIVATE
	37
[1125]	38	PUBLIC tide_init ! routine called in bdyini
	39	PUBLIC tide_data ! routine called in bdyini
	40	PUBLIC tide_update ! routine called in bdydyn
[911]	41
[1125]	42	LOGICAL, PUBLIC :: ln_tide_date !: =T correct tide phases and amplitude for model start date
[911]	43
[1125]	44	INTEGER, PARAMETER :: jptides_max = 15 !: Max number of tidal contituents
	45	INTEGER :: ntide !: Actual number of tidal constituents
[911]	46
[1125]	47	CHARACTER(len=80), PUBLIC :: filtide !: Filename root for tidal input files
	48	CHARACTER(len= 4), PUBLIC, DIMENSION(jptides_max) :: tide_cpt !: Names of tidal components used.
[911]	49
[1125]	50	INTEGER , DIMENSION(jptides_max) :: nindx !: ???
	51	REAL(wp), DIMENSION(jptides_max) :: tide_speed !: Phase speed of tidal constituent (deg/hr)
[911]	52
[1125]	53	REAL(wp), DIMENSION(jpbdim,jptides_max) :: ssh1, ssh2 !: Tidal constituents : SSH
	54	REAL(wp), DIMENSION(jpbdim,jptides_max) :: u1 , u2 !: Tidal constituents : U
	55	REAL(wp), DIMENSION(jpbdim,jptides_max) :: v1 , v2 !: Tidal constituents : V
[911]	56
[1125]	57	!!----------------------------------------------------------------------
	58	!! NEMO/OPA 3.0 , LOCEAN-IPSL (2008)
[1146]	59	!! $Id$
[1125]	60	!! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt)
	61	!!----------------------------------------------------------------------
[911]	62
	63	CONTAINS
	64
	65	SUBROUTINE tide_init
[1125]	66	!!----------------------------------------------------------------------
	67	!! * SUBROUTINE tide_init *
	68	!!
[911]	69	!! ** Purpose : - Read in namelist for tides
	70	!!
	71	!!----------------------------------------------------------------------
[1125]	72	INTEGER :: itide ! dummy loop index
	73	!!
	74	NAMELIST/namtide/ln_tide_date, filtide, tide_cpt, tide_speed
	75	!!----------------------------------------------------------------------
[911]	76
	77	IF(lwp) WRITE(numout,*)
	78	IF(lwp) WRITE(numout,*) 'tide_init : initialization of tidal harmonic forcing at open boundaries'
	79	IF(lwp) WRITE(numout,*) '~~~~~~~~~'
	80
[1125]	81	! Namelist namtide : tidal harmonic forcing at open boundaries
	82	ln_tide_date = .false.
	83	filtide(:) = ''
	84	tide_speed(:) = 0.0
	85	tide_cpt(:) = ''
	86	REWIND( numnam ) ! Read namelist parameters
[911]	87	READ ( numnam, namtide )
[1125]	88	! ! Count number of components specified
	89	ntide = jptides_max
	90	itide = 1
	91	DO WHILE( tide_cpt(itide) /= '' )
	92	ntide = itide
	93	itide = itide + 1
	94	END DO
	95	! ! find constituents in standard list
	96	DO itide = 1, ntide
	97	nindx(itide) = 0
	98	IF( TRIM( tide_cpt(itide) ) == 'Q1' ) nindx(itide) = 1
	99	IF( TRIM( tide_cpt(itide) ) == 'O1' ) nindx(itide) = 2
	100	IF( TRIM( tide_cpt(itide) ) == 'P1' ) nindx(itide) = 3
	101	IF( TRIM( tide_cpt(itide) ) == 'S1' ) nindx(itide) = 4
	102	IF( TRIM( tide_cpt(itide) ) == 'K1' ) nindx(itide) = 5
	103	IF( TRIM( tide_cpt(itide) ) == '2N2' ) nindx(itide) = 6
	104	IF( TRIM( tide_cpt(itide) ) == 'MU2' ) nindx(itide) = 7
	105	IF( TRIM( tide_cpt(itide) ) == 'N2' ) nindx(itide) = 8
	106	IF( TRIM( tide_cpt(itide) ) == 'NU2' ) nindx(itide) = 9
	107	IF( TRIM( tide_cpt(itide) ) == 'M2' ) nindx(itide) = 10
	108	IF( TRIM( tide_cpt(itide) ) == 'L2' ) nindx(itide) = 11
	109	IF( TRIM( tide_cpt(itide) ) == 'T2' ) nindx(itide) = 12
	110	IF( TRIM( tide_cpt(itide) ) == 'S2' ) nindx(itide) = 13
	111	IF( TRIM( tide_cpt(itide) ) == 'K2' ) nindx(itide) = 14
	112	IF( TRIM( tide_cpt(itide) ) == 'M4' ) nindx(itide) = 15
	113	IF( nindx(itide) == 0 .AND. lwp ) THEN
	114	WRITE(ctmp1,*) 'constitunent', itide,':', tide_cpt(itide), 'not in standard list'
	115	CALL ctl_warn( ctmp1 )
	116	ENDIF
	117	END DO
	118	! ! Parameter control and print
	119	IF( ntide < 1 ) THEN
	120	CALL ctl_stop( ' Did not find any tidal components in namelist namtide' )
	121	ELSE
	122	IF(lwp) WRITE(numout,*) ' Namelist namtide : tidal harmonic forcing at open boundaries'
	123	IF(lwp) WRITE(numout,*) ' tidal components specified ', ntide
	124	IF(lwp) WRITE(numout,*) ' ', tide_cpt(1:ntide)
	125	IF(lwp) WRITE(numout,*) ' associated phase speeds (deg/hr) : '
	126	IF(lwp) WRITE(numout,*) ' ', tide_speed(1:ntide)
	127	ENDIF
[911]	128
	129	! Initialisation of tidal harmonics arrays
	130	sshtide(:) = 0.e0
[1125]	131	utide (:) = 0.e0
	132	vtide (:) = 0.e0
	133	!
[911]	134	END SUBROUTINE tide_init
	135
[1125]	136
[911]	137	SUBROUTINE tide_data
[1125]	138	!!----------------------------------------------------------------------
	139	!! * SUBROUTINE tide_data *
	140	!!
	141	!! ** Purpose : - Read in tidal harmonics data and adjust for the start
	142	!! time of the model run.
[911]	143	!!
[1125]	144	!!----------------------------------------------------------------------
	145	INTEGER :: itide, igrd, ib ! dummy loop indices
	146	CHARACTER(len=80) :: clfile ! full file name for tidal input file
[911]	147	INTEGER :: ipi, ipj, inum, idvar ! temporary integers (netcdf read)
[1462]	148	INTEGER, DIMENSION(3) :: lendta=0 ! length of data in the file (note may be different from nblendta!)
[1125]	149	REAL(wp) :: z_arg, z_atde, z_btde, z1t, z2t
	150	REAL(wp), DIMENSION(jpbdta,1) :: zdta ! temporary array for data fields
	151	REAL(wp), DIMENSION(jptides_max) :: z_vplu, z_ftc
[911]	152	!!------------------------------------------------------------------------------
	153
[1125]	154	! Open files and read in tidal forcing data
	155	! -----------------------------------------
[911]	156
	157	ipj = 1
	158
[1125]	159	DO itide = 1, ntide
	160	! ! SSH fields
	161	clfile = TRIM(filtide)//TRIM(tide_cpt(itide))//'_grid_T.nc'
	162	IF(lwp) WRITE(numout,*) 'Reading data from file ', clfile
	163	CALL iom_open( clfile, inum )
	164	igrd = 1
	165	IF( nblendta(igrd) <= 0 ) THEN
	166	idvar = iom_varid( inum,'z1' )
	167	IF(lwp) WRITE(numout,*) 'iom_file(1)%ndims(idvar) : ',iom_file%ndims(idvar)
	168	nblendta(igrd) = iom_file(inum)%dimsz(1,idvar)
	169	WRITE(numout,*) 'Dim size for z1 is ', nblendta(igrd)
[911]	170	ENDIF
[1125]	171	ipi = nblendta(igrd)
	172	CALL iom_get( inum, jpdom_unknown, 'z1', zdta(1:ipi,1:ipj) )
	173	DO ib = 1, nblenrim(igrd)
	174	ssh1(ib,itide) = zdta(nbmap(ib,igrd),1)
[911]	175	END DO
[1125]	176	CALL iom_get( inum, jpdom_unknown, 'z2', zdta(1:ipi,1:ipj) )
	177	DO ib = 1, nblenrim(igrd)
	178	ssh2(ib,itide) = zdta(nbmap(ib,igrd),1)
[911]	179	END DO
	180	CALL iom_close( inum )
[1125]	181	!
	182	! ! U fields
	183	clfile = TRIM(filtide)//TRIM(tide_cpt(itide))//'_grid_U.nc'
	184	IF(lwp) WRITE(numout,*) 'Reading data from file ', clfile
	185	CALL iom_open( clfile, inum )
	186	igrd = 2
	187	IF( lendta(igrd) <= 0 ) THEN
	188	idvar = iom_varid( inum,'u1' )
	189	lendta(igrd) = iom_file(inum)%dimsz(1,idvar)
	190	WRITE(numout,*) 'Dim size for u1 is ',lendta(igrd)
[911]	191	ENDIF
[1125]	192	ipi = lendta(igrd)
	193	CALL iom_get( inum, jpdom_unknown, 'u1', zdta(1:ipi,1:ipj) )
	194	DO ib = 1, nblenrim(igrd)
	195	u1(ib,itide) = zdta(nbmap(ib,igrd),1)
[911]	196	END DO
[1125]	197	CALL iom_get( inum, jpdom_unknown, 'u2', zdta(1:ipi,1:ipj) )
	198	DO ib = 1, nblenrim(igrd)
	199	u2(ib,itide) = zdta(nbmap(ib,igrd),1)
[911]	200	END DO
	201	CALL iom_close( inum )
[1125]	202	!
	203	! ! V fields
	204	clfile = TRIM(filtide)//TRIM(tide_cpt(itide))//'_grid_V.nc'
	205	if(lwp) write(numout,*) 'Reading data from file ', clfile
	206	CALL iom_open( clfile, inum )
	207	igrd = 3
	208	IF( lendta(igrd) <= 0 ) THEN
	209	idvar = iom_varid( inum,'v1' )
	210	lendta(igrd) = iom_file(inum)%dimsz(1,idvar)
	211	WRITE(numout,*) 'Dim size for v1 is ', lendta(igrd)
[911]	212	ENDIF
[1125]	213	ipi = lendta(igrd)
	214	CALL iom_get( inum, jpdom_unknown, 'v1', zdta(1:ipi,1:ipj) )
	215	DO ib = 1, nblenrim(igrd)
	216	v1(ib,itide) = zdta(nbmap(ib,igrd),1)
[911]	217	END DO
[1125]	218	CALL iom_get( inum, jpdom_unknown, 'v2', zdta(1:ipi,1:ipj) )
	219	DO ib=1, nblenrim(igrd)
	220	v2(ib,itide) = zdta(nbmap(ib,igrd),1)
[911]	221	END DO
	222	CALL iom_close( inum )
[1125]	223	!
	224	END DO ! end loop on tidal components
[911]	225
[1125]	226	IF( ln_tide_date ) THEN ! correct for date factors
[911]	227
[1125]	228	!! used nmonth, nyear and nday from daymod....
	229	! Calculate date corrects for 15 standard consituents
	230	! This is the initialisation step, so nday, nmonth, nyear are the
	231	! initial date/time of the integration.
[1462]	232	print *, nday,nmonth,nyear
	233	nyear = int(ndate0 / 10000 ) ! initial year
	234	nmonth = int((ndate0 - nyear * 10000 ) / 100 ) ! initial month
	235	nday = int(ndate0 - nyear * 10000 - nmonth * 100)
[911]	236
[1125]	237	CALL uvset( 0, nday, nmonth, nyear, z_ftc, z_vplu )
[911]	238
[1125]	239	IF(lwp) WRITE(numout,*) 'Correcting tide for date:', nday, nmonth, nyear
[911]	240
[1125]	241	DO itide = 1, ntide ! loop on tidal components
	242	!
	243	IF( nindx(itide) /= 0 ) THEN
	244	!!gm use rpi and rad global variable
	245	z_arg = 3.14159265d0 * z_vplu(nindx(itide)) / 180.0d0
	246	z_atde=z_ftc(nindx(itide))*cos(z_arg)
	247	z_btde=z_ftc(nindx(itide))*sin(z_arg)
	248	IF(lwp) WRITE(numout,'(2i5,8f10.6)') itide, nindx(itide), tide_speed(itide), &
	249	& z_ftc(nindx(itide)), z_vplu(nindx(itide))
	250	ELSE
	251	z_atde = 1.0_wp
	252	z_btde = 0.0_wp
	253	ENDIF
	254	! ! elevation
	255	igrd = 1
	256	DO ib = 1, nblenrim(igrd)
	257	z1t = z_atde * ssh1(ib,itide) + z_btde * ssh2(ib,itide)
	258	z2t = z_atde * ssh2(ib,itide) - z_btde * ssh1(ib,itide)
	259	ssh1(ib,itide) = z1t
	260	ssh2(ib,itide) = z2t
	261	END DO
	262	! ! u
	263	igrd = 2
	264	DO ib = 1, nblenrim(igrd)
	265	z1t = z_atde * u1(ib,itide) + z_btde * u2(ib,itide)
	266	z2t = z_atde * u2(ib,itide) - z_btde * u1(ib,itide)
	267	u1(ib,itide) = z1t
	268	u2(ib,itide) = z2t
	269	END DO
	270	! ! v
	271	igrd = 3
	272	DO ib = 1, nblenrim(igrd)
	273	z1t = z_atde * v1(ib,itide) + z_btde * v2(ib,itide)
	274	z2t = z_atde * v2(ib,itide) - z_btde * v1(ib,itide)
	275	v1(ib,itide) = z1t
	276	v2(ib,itide) = z2t
	277	END DO
	278	!
	279	END DO ! end loop on tidal components
	280	!
	281	ENDIF ! date correction
	282	!
[911]	283	END SUBROUTINE tide_data
	284
[1125]	285
[911]	286	SUBROUTINE tide_update ( kt, jit )
[1125]	287	!!----------------------------------------------------------------------
	288	!! * SUBROUTINE tide_update *
	289	!!
[911]	290	!! ** Purpose : - Add tidal forcing to sshbdy, ubtbdy and vbtbdy arrays.
	291	!!
[1125]	292	!!----------------------------------------------------------------------
[911]	293	INTEGER, INTENT( in ) :: kt ! Main timestep counter
[1125]	294	!!gm doctor jit ==> kit
[911]	295	INTEGER, INTENT( in ) :: jit ! Barotropic timestep counter (for timesplitting option)
[1125]	296	!!
	297	INTEGER :: itide, igrd, ib ! dummy loop indices
	298	REAL(wp) :: z_arg, z_sarg !
	299	REAL(wp), DIMENSION(jptides_max) :: z_sist, z_cost
	300	!!----------------------------------------------------------------------
[911]	301
	302	! Note tide phase speeds are in deg/hour, so we need to convert the
	303	! elapsed time in seconds to hours by dividing by 3600.0
[1125]	304	IF( jit == 0 ) THEN
	305	z_arg = kt * rdt * rad / 3600.0
	306	ELSE ! we are in a barotropic subcycle (for timesplitting option)
[1462]	307	! z_arg = ( (kt-1) * rdt + jit * rdt / REAL(nn_baro,lwp) ) * rad / 3600.0
	308	z_arg = ( (kt-1) * rdt + jit * rdt / REAL(nn_baro,wp) ) * rad / 3600.0
[1125]	309	ENDIF
[911]	310
[1125]	311	DO itide = 1, ntide
	312	z_sarg = z_arg * tide_speed(itide)
	313	z_cost(itide) = COS( z_sarg )
	314	z_sist(itide) = SIN( z_sarg )
	315	END DO
[911]	316
[1125]	317	! summing of tidal constituents into BDY arrays
[911]	318	sshtide(:) = 0.0
[1125]	319	utide (:) = 0.0
	320	vtide (:) = 0.0
	321	!
	322	DO itide = 1, ntide
	323	igrd=1 ! SSH on tracer grid.
	324	DO ib = 1, nblenrim(igrd)
	325	sshtide(ib) =sshtide(ib)+ ssh1(ib,itide)z_cost(itide) + ssh2(ib,itide)z_sist(itide)
	326	! if(lwp) write(numout,*) 'z',ib,itide,sshtide(ib), ssh1(ib,itide),ssh2(ib,itide)
	327	END DO
	328	igrd=2 ! U grid
	329	DO ib=1, nblenrim(igrd)
	330	utide(ib) = utide(ib)+ u1(ib,itide)z_cost(itide) + u2(ib,itide)z_sist(itide)
	331	! if(lwp) write(numout,*) 'u',ib,itide,utide(ib), u1(ib,itide),u2(ib,itide)
	332	END DO
	333	igrd=3 ! V grid
	334	DO ib=1, nblenrim(igrd)
	335	vtide(ib) = vtide(ib)+ v1(ib,itide)z_cost(itide) + v2(ib,itide)z_sist(itide)
	336	! if(lwp) write(numout,*) 'v',ib,itide,vtide(ib), v1(ib,itide),v2(ib,itide)
	337	END DO
	338	END DO
	339	!
	340	END SUBROUTINE tide_update
[911]	341
[1125]	342	!!gm doctor naming of dummy argument variables!!! and all local variables
[911]	343
[1125]	344	SUBROUTINE uvset( ihs, iday, imnth, iyr, f, z_vplu )
	345	!!----------------------------------------------------------------------
	346	!! * SUBROUTINE uvset *
	347	!!
[911]	348	!! ** Purpose : - adjust tidal forcing for date factors
	349	!!
[1125]	350	!!----------------------------------------------------------------------
[911]	351	implicit none
	352	INTEGER, INTENT( in ) :: ihs ! Start time hours
	353	INTEGER, INTENT( in ) :: iday ! start time days
[1125]	354	INTEGER, INTENT( in ) :: imnth ! start time month
	355	INTEGER, INTENT( in ) :: iyr ! start time year
	356	!!
	357	!!gm nc is jptides_max ????
	358	INTEGER , PARAMETER :: nc =15 ! maximum number of constituents
[911]	359	CHARACTER(len=8), DIMENSION(nc) :: cname
[1125]	360	INTEGER :: year, vd, ivdy, ndc, i, k
	361	REAL(wp) :: ss, h, p, en, p1, rtd
	362	REAL(wp), DIMENSION(nc) :: f ! nodal correction
	363	REAL(wp), DIMENSION(nc) :: z_vplu ! phase correction
	364	REAL(wp), DIMENSION(nc) :: u, v, zig
	365	!!
	366	DATA cname/ 'q1' , 'o1' , 'p1' , 's1' , 'k1' , &
	367	& '2n2' , 'mu2' , 'n2' , 'nu2' , 'm2' , &
	368	& 'l2' , 't2' , 's2' , 'k2' , 'm4' /
	369	DATA zig/ .2338507481, .2433518789, .2610826055, .2617993878, .2625161701, &
	370	& .4868657873, .4881373225, .4963669182, .4976384533, .5058680490, &
	371	& .5153691799, .5228820265, .5235987756, .5250323419, 1.011736098 /
	372	!!----------------------------------------------------------------------
[911]	373	!
	374	! ihs - start time gmt on ...
	375	! iday/imnth/iyr - date e.g. 12/10/87
	376	!
[1125]	377	CALL vday(iday,imnth,iyr,ivdy)
	378	vd = ivdy
[911]	379	!
	380	!rp note change of year number for d. blackman shpen
	381	!rp if(iyr.ge.1000) year=iyr-1900
	382	!rp if(iyr.lt.1000) year=iyr
	383	year = iyr
	384	!
	385	!.....year = year of required data
	386	!.....vd = day of required data..set up for 0000gmt day year
	387	ndc = nc
	388	!.....ndc = number of constituents allowed
[1125]	389	!!gm use rpi ?
	390	rtd = 360.0 / 6.2831852
	391	DO i = 1, ndc
	392	zig(i) = zig(i)*rtd
	393	! sigo(i)= zig(i)
	394	END DO
	395
	396	!!gm try to avoid RETURN in F90
	397	IF( year == 0 ) RETURN
[911]	398
[1125]	399	CALL shpen( year, vd, ss, h , p , en, p1 )
	400	CALL ufset( p , en, u , f )
	401	CALL vset ( ss , h , p , en, p1, v )
	402	!
	403	DO k = 1, nc
	404	z_vplu(k) = v(k) + u(k)
	405	z_vplu(k) = z_vplu(k) + dble(ihs) * zig(k)
	406	DO WHILE( z_vplu(k) < 0 )
	407	z_vplu(k) = z_vplu(k) + 360.0
	408	END DO
	409	DO WHILE( z_vplu(k) > 360. )
	410	z_vplu(k) = z_vplu(k) - 360.0
	411	END DO
	412	END DO
	413	!
[911]	414	END SUBROUTINE uvset
	415
	416
[1125]	417	SUBROUTINE vday( iday, imnth, iy, ivdy )
	418	!!----------------------------------------------------------------------
	419	!! * SUBROUTINE vday *
	420	!!
[911]	421	!! ** Purpose : - adjust tidal forcing for date factors
	422	!!
[1125]	423	!!----------------------------------------------------------------------
	424	INTEGER, INTENT(in ) :: iday, imnth, iy ! ????
	425	INTEGER, INTENT( out) :: ivdy ! ???
	426	!!
	427	INTEGER :: iyr
[911]	428	!!------------------------------------------------------------------------------
	429
[1125]	430	!!gm nday_year in day mode is the variable compiuted here, no?
	431	!!gm nday_year , & !: curent day counted from jan 1st of the current year
	432
	433	!calculate day number in year from day/month/year
[911]	434	if(imnth.eq.1) ivdy=iday
	435	if(imnth.eq.2) ivdy=iday+31
	436	if(imnth.eq.3) ivdy=iday+59
	437	if(imnth.eq.4) ivdy=iday+90
	438	if(imnth.eq.5) ivdy=iday+120
	439	if(imnth.eq.6) ivdy=iday+151
	440	if(imnth.eq.7) ivdy=iday+181
	441	if(imnth.eq.8) ivdy=iday+212
	442	if(imnth.eq.9) ivdy=iday+243
	443	if(imnth.eq.10) ivdy=iday+273
	444	if(imnth.eq.11) ivdy=iday+304
	445	if(imnth.eq.12) ivdy=iday+334
[1125]	446	iyr=iy
[911]	447	if(mod(iyr,4).eq.0.and.imnth.gt.2) ivdy=ivdy+1
	448	if(mod(iyr,100).eq.0.and.imnth.gt.2) ivdy=ivdy-1
	449	if(mod(iyr,400).eq.0.and.imnth.gt.2) ivdy=ivdy+1
[1125]	450	!
	451	END SUBROUTINE vday
[911]	452
[1125]	453	!!doctor norme for dummy arguments
[911]	454
[1125]	455	SUBROUTINE shpen( year, vd, s, h, p, en, p1 )
	456	!!----------------------------------------------------------------------
	457	!! * SUBROUTINE shpen *
	458	!!
[911]	459	!! ** Purpose : - calculate astronomical arguments for tides
	460	!! this version from d. blackman 30 nove 1990
	461	!!
[1125]	462	!!----------------------------------------------------------------------
	463	!!gm add INTENT in, out or inout.... DOCTOR name....
	464	!!gm please do not use variable name with a single letter: impossible to search in a code
	465	INTEGER :: year,vd
	466	REAL(wp) :: s,h,p,en,p1
	467	!!
	468	INTEGER :: yr,ilc,icent,it,iday,ild,ipos,nn,iyd
[911]	469	REAL(wp) :: cycle,t,td,delt(84),delta,deltat
[1125]	470	!!
	471	DATA delt /-5.04, -3.90, -2.87, -0.58, 0.71, 1.80, &
	472	& 3.08, 4.63, 5.86, 7.21, 8.58, 10.50, 12.10, &
	473	& 12.49, 14.41, 15.59, 15.81, 17.52, 19.01, 18.39, &
	474	& 19.55, 20.36, 21.01, 21.81, 21.76, 22.35, 22.68, &
	475	& 22.94, 22.93, 22.69, 22.94, 23.20, 23.31, 23.63, &
	476	& 23.47, 23.68, 23.62, 23.53, 23.59, 23.99, 23.80, &
	477	& 24.20, 24.99, 24.97, 25.72, 26.21, 26.37, 26.89, &
	478	& 27.68, 28.13, 28.94, 29.42, 29.66, 30.29, 30.96, &
	479	& 31.09, 31.59, 31.52, 31.92, 32.45, 32.91, 33.39, &
	480	& 33.80, 34.23, 34.73, 35.40, 36.14, 36.99, 37.87, &
	481	& 38.75, 39.70, 40.70, 41.68, 42.82, 43.96, 45.00, &
	482	& 45.98, 47.00, 48.03, 49.10, 50.10, 50.97, 51.81, &
	483	& 52.57 /
	484	!!----------------------------------------------------------------------
[911]	485
	486	cycle = 360.0
	487	ilc = 0
[1125]	488	icent = year / 100
	489	yr = year - icent * 100
[911]	490	t = icent - 20
	491	!
	492	! for the following equations
	493	! time origin is fixed at 00 hr of jan 1st,2000.
	494	! see notes by cartwright
	495	!
[1125]	496	!!gm old coding style, use CASE instead and avoid GOTO (obsolescence in fortran 90)
	497	!!gm obsol( 1): Arithmetic IF statement is used ===> remove this in Fortran 90
[911]	498	it = icent - 20
	499	if (it) 1,2,2
	500	1 iday = it/4 -it
	501	go to 3
	502	2 iday = (it+3)/4 - it
	503	!
	504	! t is in julian century
	505	! correction in gegorian calander where only century year divisible
	506	! by 4 is leap year.
	507	!
	508	3 continue
	509	!
	510	td = 0.0
	511	!
[1125]	512	!!gm obsol( 1): Arithmetic IF statement is used ===> remove this in Fortran 90
[911]	513	if (yr) 4,5,4
	514	!
	515	4 iyd = 365*yr
	516	ild = (yr-1)/4
	517	if((icent - (icent/4)*4) .eq. 0) ilc = 1
	518	td = iyd + ild + ilc
	519	!
	520	5 td = td + iday + vd -1.0 - 0.5
	521	t = t + (td/36525.0)
	522	!
	523	ipos=year-1899
	524	if (ipos .lt. 0) go to 7
	525	if (ipos .gt. 83) go to 6
	526	!
	527	delta = (delt(ipos+1)+delt(ipos))/2.0
	528	go to 7
	529	!
	530	6 delta= (65.0-50.5)/20.0*(year-1980)+50.5
	531	!
	532	7 deltat = delta * 1.0e-6
	533	!
[1125]	534	!!gm precision of the computation : example for s it should be replace by:
	535	!!gm s = 218.3165 + (481267.8813 - 0.0016t)t + 152.0*deltat ==> more precise modify the last digits results
[911]	536	s = 218.3165 + 481267.8813t - 0.0016tt + 152.0deltat
[1125]	537	h = 280.4661 + 36000.7698 t + 0.0003tt + 11.0deltat
	538	p = 83.3535 + 4069.0139 t - 0.0103t*t + deltat
	539	en = 234.9555 + 1934.1363 t - 0.0021t*t + deltat
	540	p1 = 282.9384 + 1.7195 t + 0.0005t*t
	541	!
	542	nn = s / cycle
	543	s = s - nn * cycle
	544	IF( s < 0.e0 ) s = s + cycle
	545	!
	546	nn = h / cycle
	547	h = h - cycle * nn
	548	IF( h < 0.e0 ) h = h + cycle
	549	!
	550	nn = p / cycle
	551	p = p - cycle * nn
	552	IF( p < 0.e0) p = p + cycle
	553	!
	554	nn = en / cycle
	555	en = en - cycle * nn
	556	IF( en < 0.e0 ) en = en + cycle
[911]	557	en = cycle - en
[1125]	558	!
	559	nn = p1 / cycle
	560	p1 = p1 - nn * cycle
	561	!
	562	END SUBROUTINE shpen
[911]	563
	564
[1125]	565	SUBROUTINE ufset( p, cn, b, a )
	566	!!----------------------------------------------------------------------
	567	!! * SUBROUTINE ufset *
	568	!!
[911]	569	!! ** Purpose : - calculate nodal parameters for the tides
	570	!!
[1125]	571	!!----------------------------------------------------------------------
	572	!!gm doctor naming of dummy argument variables!!! and all local variables
	573	!!gm nc is jptides_max ????
[911]	574	integer nc
	575	parameter (nc=15)
[1125]	576	REAL(wp) p,cn
	577	!!
	578
	579	!!gm rad is already a public variable defined in phycst.F90 .... ==> doctor norme local real start with "z"
	580	REAL(wp) :: w1, w2, w3, w4, w5, w6, w7, w8, nw, pw, rad
	581	REAL(wp) :: a(nc), b(nc)
	582	INTEGER :: ndc, k
	583	!!----------------------------------------------------------------------
[911]	584
[1125]	585	ndc = nc
	586
[911]	587	! a=f , b =u
	588	! t is zero as compared to tifa.
[1125]	589	!! use rad defined in phycst (i.e. add a USE phycst at the begining of the module
[911]	590	rad = 6.2831852d0/360.0
[1125]	591	pw = p * rad
	592	nw = cn * rad
	593	w1 = cos( nw )
	594	w2 = cos( 2*nw )
	595	w3 = cos( 3*nw )
	596	w4 = sin( nw )
	597	w5 = sin( 2*nw )
	598	w6 = sin( 3*nw )
	599	w7 = 1. - 0.2505 * COS( 2pw ) - 0.1102 COS(2*pw-nw ) &
	600	& - 0.156 * COS( 2pw-2nw ) - 0.037 * COS( nw )
	601	w8 = - 0.2505 * SIN( 2pw ) - 0.1102 SIN(2*pw-nw ) &
	602	& - 0.0156 * SIN( 2pw-2nw ) - 0.037 * SIN( nw )
	603	!
	604	a(1) = 1.0089 + 0.1871 * w1 - 0.0147 * w2 + 0.0014 * w3
	605	b(1) = 0.1885 * w4 - 0.0234 * w5 + 0.0033 * w6
	606	! q1
[911]	607	a(2) = a(1)
	608	b(2) = b(1)
[1125]	609	! o1
[911]	610	a(3) = 1.0
	611	b(3) = 0.0
[1125]	612	! p1
[911]	613	a(4) = 1.0
	614	b(4) = 0.0
[1125]	615	! s1
[911]	616	a(5) = 1.0060+0.1150w1- 0.0088w2 +0.0006*w3
	617	b(5) = -0.1546w4 + 0.0119w5 -0.0012*w6
[1125]	618	! k1
[911]	619	a(6) =1.0004 -0.0373w1+ 0.0002w2
	620	b(6) = -0.0374*w4
[1125]	621	! 2n2
[911]	622	a(7) = a(6)
	623	b(7) = b(6)
[1125]	624	! mu2
[911]	625	a(8) = a(6)
	626	b(8) = b(6)
[1125]	627	! n2
[911]	628	a(9) = a(6)
	629	b(9) = b(6)
[1125]	630	! nu2
[911]	631	a(10) = a(6)
	632	b(10) = b(6)
[1125]	633	! m2
	634	a(11) = SQRT( w7 * w7 + w8 * w8 )
	635	b(11) = ATAN( w8 / w7 )
	636	!!gmuse rpi instead of 3.141992 ??? true pi is rpi=3.141592653589793_wp ..... ????
	637	IF( w7 < 0.e0 ) b(11) = b(11) + 3.141992
	638	! l2
[911]	639	a(12) = 1.0
	640	b(12) = 0.0
[1125]	641	! t2
[911]	642	a(13)= a(12)
	643	b(13)= b(12)
[1125]	644	! s2
[911]	645	a(14) = 1.0241+0.2863w1+0.0083w2 -0.0015*w3
	646	b(14) = -0.3096w4 + 0.0119w5 - 0.0007*w6
[1125]	647	! k2
[911]	648	a(15) = a(6)*a(6)
	649	b(15) = 2*b(6)
[1125]	650	! m4
	651	!!gm old coding, remove GOTO and label of lines
	652	!!gm obsol( 1): Arithmetic IF statement is used ===> remove this in Fortran 90
	653	DO 40 k = 1,ndc
	654	b(k) = b(k)/rad
	655	32 if (b(k)) 34,35,35
	656	34 b(k) = b(k) + 360.0
	657	go to 32
	658	35 if (b(k)-360.0) 40,37,37
	659	37 b(k) = b(k)-360.0
	660	go to 35
[911]	661	40 continue
[1125]	662	!
	663	END SUBROUTINE ufset
	664
[911]	665
[1125]	666	SUBROUTINE vset( s,h,p,en,p1,v)
	667	!!----------------------------------------------------------------------
	668	!! * SUBROUTINE vset *
	669	!!
[911]	670	!! ** Purpose : - calculate tidal phases for 0000gmt on start day of run
	671	!!
[1125]	672	!!----------------------------------------------------------------------
	673	!!gm doctor naming of dummy argument variables!!! and all local variables
	674	!!gm nc is jptides_max ????
	675	!!gm en argument is not used: suppress it ?
[911]	676	integer nc
	677	parameter (nc=15)
	678	real(wp) s,h,p,en,p1
	679	real(wp) v(nc)
[1125]	680	!!
	681	integer ndc, k
	682	!!----------------------------------------------------------------------
[911]	683
	684	ndc = nc
[1125]	685	! v s are computed here.
	686	v(1) =-3*s +h +p +270 ! Q1
	687	v(2) =-2*s +h +270.0 ! O1
	688	v(3) =-h +270 ! P1
	689	v(4) =180 ! S1
	690	v(5) =h +90.0 ! K1
	691	v(6) =-4s +2h +2*p ! 2N2
	692	v(7) =-4*(s-h) ! MU2
	693	v(8) =-3s +2h +p ! N2
	694	v(9) =-3s +4h -p ! MU2
	695	v(10) =-2s +2h ! M2
	696	v(11) =-s +2*h -p +180 ! L2
	697	v(12) =-h +p1 ! T2
	698	v(13) =0 ! S2
	699	v(14) =h+h ! K2
	700	v(15) =2*v(10) ! M4
[911]	701	!
[1125]	702	!!gm old coding, remove GOTO and label of lines
	703	!!gm obsol( 1): Arithmetic IF statement is used ===> remove this in Fortran 90
[911]	704	do 72 k = 1, ndc
[1125]	705	69 if( v(k) ) 70,71,71
	706	70 v(k) = v(k)+360.0
	707	go to 69
	708	71 if( v(k) - 360.0 ) 72,73,73
	709	73 v(k) = v(k)-360.0
	710	go to 71
[911]	711	72 continue
[1125]	712	!
	713	END SUBROUTINE vset
[911]	714
	715	#else
[1125]	716	!!----------------------------------------------------------------------
	717	!! Dummy module NO Unstruct Open Boundary Conditions for tides
	718	!!----------------------------------------------------------------------
	719	!!gm are you sure we need to define filtide and tide_cpt ?
	720	CHARACTER(len=80), PUBLIC :: filtide !: Filename root for tidal input files
	721	CHARACTER(len=4 ), PUBLIC, DIMENSION(1) :: tide_cpt !: Names of tidal components used.
[911]	722
	723	CONTAINS
[1125]	724	SUBROUTINE tide_init ! Empty routine
[911]	725	END SUBROUTINE tide_init
[1125]	726	SUBROUTINE tide_data ! Empty routine
[911]	727	END SUBROUTINE tide_data
[1125]	728	SUBROUTINE tide_update( kt, kit ) ! Empty routine
	729	WRITE(,) 'tide_update: You should not have seen this print! error?', kt, kit
[911]	730	END SUBROUTINE tide_update
	731	#endif
	732
[1125]	733	!!======================================================================
[911]	734	END MODULE bdytides

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