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bdytides.F90 in branches/2011/dev_r2802_LOCEAN10_agrif_lim/NEMOGCM/NEMO/OPA_SRC/BDY – NEMO

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source: branches/2011/dev_r2802_LOCEAN10_agrif_lim/NEMOGCM/NEMO/OPA_SRC/BDY/bdytides.F90 @ 2815

Last change on this file since 2815 was 2815, checked in by rblod, 13 years ago
branch dev_r2802_LOCEAN10_agrif_lim2: avoid to recompile everything with key_agrif, allow parallel compilation with agrif etc
Property svn:keywords set to `Id`
File size: 29.4 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
[2528]	9	!! 3.3 ! 2010-09 (D.Storkey and E.O'Dea) bug fixes
[1125]	10	!!----------------------------------------------------------------------
[2815]	11	USE oce ! ocean dynamics and tracers
	12	USE dom_oce ! ocean space and time domain
	13	USE iom
	14	USE in_out_manager ! I/O units
	15	USE phycst ! physical constants
	16	USE lbclnk ! ocean lateral boundary conditions (or mpp link)
	17	USE bdy_par ! Unstructured boundary parameters
	18	USE bdy_oce ! ocean open boundary conditions
	19	USE daymod ! calendar
[1125]	20	#if defined key_bdy
	21	!!----------------------------------------------------------------------
	22	!! 'key_bdy' Unstructured Open Boundary Condition
	23	!!----------------------------------------------------------------------
[911]	24	!! PUBLIC
[1125]	25	!! tide_init : read of namelist
	26	!! tide_data : read in and initialisation of tidal constituents at boundary
	27	!! tide_update : calculation of tidal forcing at each timestep
[911]	28	!! PRIVATE
[1125]	29	!! uvset :\
	30	!! vday : \| Routines to correct tidal harmonics forcing for
	31	!! shpen : \| start time of integration
	32	!! ufset : \|
	33	!! vset :/
	34	!!----------------------------------------------------------------------
	35
[911]	36	IMPLICIT NONE
	37	PRIVATE
	38
[1125]	39	PUBLIC tide_init ! routine called in bdyini
	40	PUBLIC tide_data ! routine called in bdyini
	41	PUBLIC tide_update ! routine called in bdydyn
[911]	42
[2528]	43	LOGICAL, PUBLIC :: ln_tide_date !: =T correct tide phases and amplitude for model start date
	44	INTEGER, PUBLIC, PARAMETER :: jptides_max = 15 !: Max number of tidal contituents
	45	INTEGER, PUBLIC :: 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
[2528]	50	INTEGER , PUBLIC, DIMENSION(jptides_max) :: nindx !: ???
	51	REAL(wp), PUBLIC, DIMENSION(jptides_max) :: tide_speed !: Phase speed of tidal constituent (deg/hr)
[911]	52
[2528]	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	!!----------------------------------------------------------------------
[2528]	58	!! NEMO/OPA 3.3 , NEMO Consortium (2010)
[1146]	59	!! $Id$
[2528]	60	!! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt)
[1125]	61	!!----------------------------------------------------------------------
[911]	62	CONTAINS
	63
	64	SUBROUTINE tide_init
[1125]	65	!!----------------------------------------------------------------------
	66	!! * SUBROUTINE tide_init *
	67	!!
[911]	68	!! ** Purpose : - Read in namelist for tides
	69	!!
	70	!!----------------------------------------------------------------------
[1125]	71	INTEGER :: itide ! dummy loop index
	72	!!
[1601]	73	NAMELIST/nambdy_tide/ln_tide_date, filtide, tide_cpt, tide_speed
[1125]	74	!!----------------------------------------------------------------------
[911]	75
	76	IF(lwp) WRITE(numout,*)
	77	IF(lwp) WRITE(numout,*) 'tide_init : initialization of tidal harmonic forcing at open boundaries'
	78	IF(lwp) WRITE(numout,*) '~~~~~~~~~'
	79
[1601]	80	! Namelist nambdy_tide : tidal harmonic forcing at open boundaries
[1125]	81	ln_tide_date = .false.
	82	filtide(:) = ''
	83	tide_speed(:) = 0.0
	84	tide_cpt(:) = ''
	85	REWIND( numnam ) ! Read namelist parameters
[1601]	86	READ ( numnam, nambdy_tide )
[1125]	87	! ! Count number of components specified
	88	ntide = jptides_max
[2528]	89	DO itide = 1, jptides_max
	90	IF( tide_cpt(itide) == '' ) THEN
	91	ntide = itide-1
	92	exit
	93	ENDIF
[1125]	94	END DO
[2528]	95
[1125]	96	! ! find constituents in standard list
	97	DO itide = 1, ntide
	98	nindx(itide) = 0
	99	IF( TRIM( tide_cpt(itide) ) == 'Q1' ) nindx(itide) = 1
	100	IF( TRIM( tide_cpt(itide) ) == 'O1' ) nindx(itide) = 2
	101	IF( TRIM( tide_cpt(itide) ) == 'P1' ) nindx(itide) = 3
	102	IF( TRIM( tide_cpt(itide) ) == 'S1' ) nindx(itide) = 4
	103	IF( TRIM( tide_cpt(itide) ) == 'K1' ) nindx(itide) = 5
	104	IF( TRIM( tide_cpt(itide) ) == '2N2' ) nindx(itide) = 6
	105	IF( TRIM( tide_cpt(itide) ) == 'MU2' ) nindx(itide) = 7
	106	IF( TRIM( tide_cpt(itide) ) == 'N2' ) nindx(itide) = 8
	107	IF( TRIM( tide_cpt(itide) ) == 'NU2' ) nindx(itide) = 9
	108	IF( TRIM( tide_cpt(itide) ) == 'M2' ) nindx(itide) = 10
	109	IF( TRIM( tide_cpt(itide) ) == 'L2' ) nindx(itide) = 11
	110	IF( TRIM( tide_cpt(itide) ) == 'T2' ) nindx(itide) = 12
	111	IF( TRIM( tide_cpt(itide) ) == 'S2' ) nindx(itide) = 13
	112	IF( TRIM( tide_cpt(itide) ) == 'K2' ) nindx(itide) = 14
	113	IF( TRIM( tide_cpt(itide) ) == 'M4' ) nindx(itide) = 15
	114	IF( nindx(itide) == 0 .AND. lwp ) THEN
	115	WRITE(ctmp1,*) 'constitunent', itide,':', tide_cpt(itide), 'not in standard list'
	116	CALL ctl_warn( ctmp1 )
	117	ENDIF
	118	END DO
	119	! ! Parameter control and print
	120	IF( ntide < 1 ) THEN
[1601]	121	CALL ctl_stop( ' Did not find any tidal components in namelist nambdy_tide' )
[1125]	122	ELSE
[1601]	123	IF(lwp) WRITE(numout,*) ' Namelist nambdy_tide : tidal harmonic forcing at open boundaries'
[1125]	124	IF(lwp) WRITE(numout,*) ' tidal components specified ', ntide
	125	IF(lwp) WRITE(numout,*) ' ', tide_cpt(1:ntide)
	126	IF(lwp) WRITE(numout,*) ' associated phase speeds (deg/hr) : '
	127	IF(lwp) WRITE(numout,*) ' ', tide_speed(1:ntide)
	128	ENDIF
[911]	129
	130	! Initialisation of tidal harmonics arrays
	131	sshtide(:) = 0.e0
[1125]	132	utide (:) = 0.e0
	133	vtide (:) = 0.e0
	134	!
[911]	135	END SUBROUTINE tide_init
	136
[1125]	137
[911]	138	SUBROUTINE tide_data
[1125]	139	!!----------------------------------------------------------------------
	140	!! * SUBROUTINE tide_data *
	141	!!
	142	!! ** Purpose : - Read in tidal harmonics data and adjust for the start
	143	!! time of the model run.
[911]	144	!!
[1125]	145	!!----------------------------------------------------------------------
	146	INTEGER :: itide, igrd, ib ! dummy loop indices
	147	CHARACTER(len=80) :: clfile ! full file name for tidal input file
[911]	148	INTEGER :: ipi, ipj, inum, idvar ! temporary integers (netcdf read)
[2528]	149	INTEGER, DIMENSION(6) :: lendta=0 ! length of data in the file (note may be different from nblendta!)
[1125]	150	REAL(wp) :: z_arg, z_atde, z_btde, z1t, z2t
	151	REAL(wp), DIMENSION(jpbdta,1) :: zdta ! temporary array for data fields
	152	REAL(wp), DIMENSION(jptides_max) :: z_vplu, z_ftc
[911]	153	!!------------------------------------------------------------------------------
	154
[1125]	155	! Open files and read in tidal forcing data
	156	! -----------------------------------------
[911]	157
	158	ipj = 1
	159
[1125]	160	DO itide = 1, ntide
	161	! ! SSH fields
	162	clfile = TRIM(filtide)//TRIM(tide_cpt(itide))//'_grid_T.nc'
	163	IF(lwp) WRITE(numout,*) 'Reading data from file ', clfile
	164	CALL iom_open( clfile, inum )
[2528]	165	igrd = 4
[1125]	166	IF( nblendta(igrd) <= 0 ) THEN
	167	idvar = iom_varid( inum,'z1' )
	168	IF(lwp) WRITE(numout,*) 'iom_file(1)%ndims(idvar) : ',iom_file%ndims(idvar)
	169	nblendta(igrd) = iom_file(inum)%dimsz(1,idvar)
	170	WRITE(numout,*) 'Dim size for z1 is ', nblendta(igrd)
[911]	171	ENDIF
[1125]	172	ipi = nblendta(igrd)
	173	CALL iom_get( inum, jpdom_unknown, 'z1', zdta(1:ipi,1:ipj) )
	174	DO ib = 1, nblenrim(igrd)
	175	ssh1(ib,itide) = zdta(nbmap(ib,igrd),1)
[911]	176	END DO
[1125]	177	CALL iom_get( inum, jpdom_unknown, 'z2', zdta(1:ipi,1:ipj) )
	178	DO ib = 1, nblenrim(igrd)
	179	ssh2(ib,itide) = zdta(nbmap(ib,igrd),1)
[911]	180	END DO
	181	CALL iom_close( inum )
[1125]	182	!
	183	! ! U fields
	184	clfile = TRIM(filtide)//TRIM(tide_cpt(itide))//'_grid_U.nc'
	185	IF(lwp) WRITE(numout,*) 'Reading data from file ', clfile
	186	CALL iom_open( clfile, inum )
[2528]	187	igrd = 5
[1125]	188	IF( lendta(igrd) <= 0 ) THEN
	189	idvar = iom_varid( inum,'u1' )
	190	lendta(igrd) = iom_file(inum)%dimsz(1,idvar)
	191	WRITE(numout,*) 'Dim size for u1 is ',lendta(igrd)
[911]	192	ENDIF
[1125]	193	ipi = lendta(igrd)
	194	CALL iom_get( inum, jpdom_unknown, 'u1', zdta(1:ipi,1:ipj) )
	195	DO ib = 1, nblenrim(igrd)
	196	u1(ib,itide) = zdta(nbmap(ib,igrd),1)
[911]	197	END DO
[1125]	198	CALL iom_get( inum, jpdom_unknown, 'u2', zdta(1:ipi,1:ipj) )
	199	DO ib = 1, nblenrim(igrd)
	200	u2(ib,itide) = zdta(nbmap(ib,igrd),1)
[911]	201	END DO
	202	CALL iom_close( inum )
[1125]	203	!
	204	! ! V fields
	205	clfile = TRIM(filtide)//TRIM(tide_cpt(itide))//'_grid_V.nc'
	206	if(lwp) write(numout,*) 'Reading data from file ', clfile
	207	CALL iom_open( clfile, inum )
[2528]	208	igrd = 6
[1125]	209	IF( lendta(igrd) <= 0 ) THEN
	210	idvar = iom_varid( inum,'v1' )
	211	lendta(igrd) = iom_file(inum)%dimsz(1,idvar)
	212	WRITE(numout,*) 'Dim size for v1 is ', lendta(igrd)
[911]	213	ENDIF
[1125]	214	ipi = lendta(igrd)
	215	CALL iom_get( inum, jpdom_unknown, 'v1', zdta(1:ipi,1:ipj) )
	216	DO ib = 1, nblenrim(igrd)
	217	v1(ib,itide) = zdta(nbmap(ib,igrd),1)
[911]	218	END DO
[1125]	219	CALL iom_get( inum, jpdom_unknown, 'v2', zdta(1:ipi,1:ipj) )
	220	DO ib=1, nblenrim(igrd)
	221	v2(ib,itide) = zdta(nbmap(ib,igrd),1)
[911]	222	END DO
	223	CALL iom_close( inum )
[1125]	224	!
	225	END DO ! end loop on tidal components
[911]	226
[1125]	227	IF( ln_tide_date ) THEN ! correct for date factors
[911]	228
[1125]	229	!! used nmonth, nyear and nday from daymod....
	230	! Calculate date corrects for 15 standard consituents
	231	! This is the initialisation step, so nday, nmonth, nyear are the
	232	! initial date/time of the integration.
[1462]	233	print *, nday,nmonth,nyear
	234	nyear = int(ndate0 / 10000 ) ! initial year
	235	nmonth = int((ndate0 - nyear * 10000 ) / 100 ) ! initial month
	236	nday = int(ndate0 - nyear * 10000 - nmonth * 100)
[911]	237
[1125]	238	CALL uvset( 0, nday, nmonth, nyear, z_ftc, z_vplu )
[911]	239
[1125]	240	IF(lwp) WRITE(numout,*) 'Correcting tide for date:', nday, nmonth, nyear
[911]	241
[1125]	242	DO itide = 1, ntide ! loop on tidal components
	243	!
	244	IF( nindx(itide) /= 0 ) THEN
	245	!!gm use rpi and rad global variable
	246	z_arg = 3.14159265d0 * z_vplu(nindx(itide)) / 180.0d0
	247	z_atde=z_ftc(nindx(itide))*cos(z_arg)
	248	z_btde=z_ftc(nindx(itide))*sin(z_arg)
	249	IF(lwp) WRITE(numout,'(2i5,8f10.6)') itide, nindx(itide), tide_speed(itide), &
	250	& z_ftc(nindx(itide)), z_vplu(nindx(itide))
	251	ELSE
	252	z_atde = 1.0_wp
	253	z_btde = 0.0_wp
	254	ENDIF
	255	! ! elevation
[2528]	256	igrd = 4
[1125]	257	DO ib = 1, nblenrim(igrd)
	258	z1t = z_atde * ssh1(ib,itide) + z_btde * ssh2(ib,itide)
	259	z2t = z_atde * ssh2(ib,itide) - z_btde * ssh1(ib,itide)
	260	ssh1(ib,itide) = z1t
	261	ssh2(ib,itide) = z2t
	262	END DO
	263	! ! u
[2528]	264	igrd = 5
[1125]	265	DO ib = 1, nblenrim(igrd)
	266	z1t = z_atde * u1(ib,itide) + z_btde * u2(ib,itide)
	267	z2t = z_atde * u2(ib,itide) - z_btde * u1(ib,itide)
	268	u1(ib,itide) = z1t
	269	u2(ib,itide) = z2t
	270	END DO
	271	! ! v
[2528]	272	igrd = 6
[1125]	273	DO ib = 1, nblenrim(igrd)
	274	z1t = z_atde * v1(ib,itide) + z_btde * v2(ib,itide)
	275	z2t = z_atde * v2(ib,itide) - z_btde * v1(ib,itide)
	276	v1(ib,itide) = z1t
	277	v2(ib,itide) = z2t
	278	END DO
	279	!
	280	END DO ! end loop on tidal components
	281	!
	282	ENDIF ! date correction
	283	!
[911]	284	END SUBROUTINE tide_data
	285
[1125]	286
[911]	287	SUBROUTINE tide_update ( kt, jit )
[1125]	288	!!----------------------------------------------------------------------
	289	!! * SUBROUTINE tide_update *
	290	!!
[911]	291	!! ** Purpose : - Add tidal forcing to sshbdy, ubtbdy and vbtbdy arrays.
	292	!!
[1125]	293	!!----------------------------------------------------------------------
[911]	294	INTEGER, INTENT( in ) :: kt ! Main timestep counter
[1125]	295	!!gm doctor jit ==> kit
[911]	296	INTEGER, INTENT( in ) :: jit ! Barotropic timestep counter (for timesplitting option)
[1125]	297	!!
	298	INTEGER :: itide, igrd, ib ! dummy loop indices
	299	REAL(wp) :: z_arg, z_sarg !
	300	REAL(wp), DIMENSION(jptides_max) :: z_sist, z_cost
	301	!!----------------------------------------------------------------------
[911]	302
	303	! Note tide phase speeds are in deg/hour, so we need to convert the
	304	! elapsed time in seconds to hours by dividing by 3600.0
[1125]	305	IF( jit == 0 ) THEN
	306	z_arg = kt * rdt * rad / 3600.0
	307	ELSE ! we are in a barotropic subcycle (for timesplitting option)
[1462]	308	! z_arg = ( (kt-1) * rdt + jit * rdt / REAL(nn_baro,lwp) ) * rad / 3600.0
	309	z_arg = ( (kt-1) * rdt + jit * rdt / REAL(nn_baro,wp) ) * rad / 3600.0
[1125]	310	ENDIF
[911]	311
[1125]	312	DO itide = 1, ntide
	313	z_sarg = z_arg * tide_speed(itide)
	314	z_cost(itide) = COS( z_sarg )
	315	z_sist(itide) = SIN( z_sarg )
	316	END DO
[911]	317
[1125]	318	! summing of tidal constituents into BDY arrays
[911]	319	sshtide(:) = 0.0
[1125]	320	utide (:) = 0.0
	321	vtide (:) = 0.0
	322	!
	323	DO itide = 1, ntide
[2528]	324	igrd=4 ! SSH on tracer grid.
[1125]	325	DO ib = 1, nblenrim(igrd)
	326	sshtide(ib) =sshtide(ib)+ ssh1(ib,itide)z_cost(itide) + ssh2(ib,itide)z_sist(itide)
	327	! if(lwp) write(numout,*) 'z',ib,itide,sshtide(ib), ssh1(ib,itide),ssh2(ib,itide)
	328	END DO
[2528]	329	igrd=5 ! U grid
[1125]	330	DO ib=1, nblenrim(igrd)
	331	utide(ib) = utide(ib)+ u1(ib,itide)z_cost(itide) + u2(ib,itide)z_sist(itide)
	332	! if(lwp) write(numout,*) 'u',ib,itide,utide(ib), u1(ib,itide),u2(ib,itide)
	333	END DO
[2528]	334	igrd=6 ! V grid
[1125]	335	DO ib=1, nblenrim(igrd)
	336	vtide(ib) = vtide(ib)+ v1(ib,itide)z_cost(itide) + v2(ib,itide)z_sist(itide)
	337	! if(lwp) write(numout,*) 'v',ib,itide,vtide(ib), v1(ib,itide),v2(ib,itide)
	338	END DO
	339	END DO
	340	!
	341	END SUBROUTINE tide_update
[911]	342
[1125]	343	!!gm doctor naming of dummy argument variables!!! and all local variables
[911]	344
[1125]	345	SUBROUTINE uvset( ihs, iday, imnth, iyr, f, z_vplu )
	346	!!----------------------------------------------------------------------
	347	!! * SUBROUTINE uvset *
	348	!!
[911]	349	!! ** Purpose : - adjust tidal forcing for date factors
	350	!!
[1125]	351	!!----------------------------------------------------------------------
[911]	352	implicit none
	353	INTEGER, INTENT( in ) :: ihs ! Start time hours
	354	INTEGER, INTENT( in ) :: iday ! start time days
[1125]	355	INTEGER, INTENT( in ) :: imnth ! start time month
	356	INTEGER, INTENT( in ) :: iyr ! start time year
	357	!!
	358	!!gm nc is jptides_max ????
	359	INTEGER , PARAMETER :: nc =15 ! maximum number of constituents
[911]	360	CHARACTER(len=8), DIMENSION(nc) :: cname
[1125]	361	INTEGER :: year, vd, ivdy, ndc, i, k
	362	REAL(wp) :: ss, h, p, en, p1, rtd
	363	REAL(wp), DIMENSION(nc) :: f ! nodal correction
	364	REAL(wp), DIMENSION(nc) :: z_vplu ! phase correction
	365	REAL(wp), DIMENSION(nc) :: u, v, zig
	366	!!
	367	DATA cname/ 'q1' , 'o1' , 'p1' , 's1' , 'k1' , &
	368	& '2n2' , 'mu2' , 'n2' , 'nu2' , 'm2' , &
	369	& 'l2' , 't2' , 's2' , 'k2' , 'm4' /
	370	DATA zig/ .2338507481, .2433518789, .2610826055, .2617993878, .2625161701, &
	371	& .4868657873, .4881373225, .4963669182, .4976384533, .5058680490, &
	372	& .5153691799, .5228820265, .5235987756, .5250323419, 1.011736098 /
	373	!!----------------------------------------------------------------------
[911]	374	!
	375	! ihs - start time gmt on ...
	376	! iday/imnth/iyr - date e.g. 12/10/87
	377	!
[1125]	378	CALL vday(iday,imnth,iyr,ivdy)
	379	vd = ivdy
[911]	380	!
	381	!rp note change of year number for d. blackman shpen
	382	!rp if(iyr.ge.1000) year=iyr-1900
	383	!rp if(iyr.lt.1000) year=iyr
	384	year = iyr
	385	!
	386	!.....year = year of required data
	387	!.....vd = day of required data..set up for 0000gmt day year
	388	ndc = nc
	389	!.....ndc = number of constituents allowed
[1125]	390	!!gm use rpi ?
	391	rtd = 360.0 / 6.2831852
	392	DO i = 1, ndc
	393	zig(i) = zig(i)*rtd
	394	! sigo(i)= zig(i)
	395	END DO
	396
	397	!!gm try to avoid RETURN in F90
	398	IF( year == 0 ) RETURN
[911]	399
[1125]	400	CALL shpen( year, vd, ss, h , p , en, p1 )
	401	CALL ufset( p , en, u , f )
	402	CALL vset ( ss , h , p , en, p1, v )
	403	!
	404	DO k = 1, nc
	405	z_vplu(k) = v(k) + u(k)
	406	z_vplu(k) = z_vplu(k) + dble(ihs) * zig(k)
	407	DO WHILE( z_vplu(k) < 0 )
	408	z_vplu(k) = z_vplu(k) + 360.0
	409	END DO
	410	DO WHILE( z_vplu(k) > 360. )
	411	z_vplu(k) = z_vplu(k) - 360.0
	412	END DO
	413	END DO
	414	!
[911]	415	END SUBROUTINE uvset
	416
	417
[1125]	418	SUBROUTINE vday( iday, imnth, iy, ivdy )
	419	!!----------------------------------------------------------------------
	420	!! * SUBROUTINE vday *
	421	!!
[911]	422	!! ** Purpose : - adjust tidal forcing for date factors
	423	!!
[1125]	424	!!----------------------------------------------------------------------
	425	INTEGER, INTENT(in ) :: iday, imnth, iy ! ????
	426	INTEGER, INTENT( out) :: ivdy ! ???
	427	!!
	428	INTEGER :: iyr
[911]	429	!!------------------------------------------------------------------------------
	430
[1125]	431	!!gm nday_year in day mode is the variable compiuted here, no?
	432	!!gm nday_year , & !: curent day counted from jan 1st of the current year
	433
	434	!calculate day number in year from day/month/year
[911]	435	if(imnth.eq.1) ivdy=iday
	436	if(imnth.eq.2) ivdy=iday+31
	437	if(imnth.eq.3) ivdy=iday+59
	438	if(imnth.eq.4) ivdy=iday+90
	439	if(imnth.eq.5) ivdy=iday+120
	440	if(imnth.eq.6) ivdy=iday+151
	441	if(imnth.eq.7) ivdy=iday+181
	442	if(imnth.eq.8) ivdy=iday+212
	443	if(imnth.eq.9) ivdy=iday+243
	444	if(imnth.eq.10) ivdy=iday+273
	445	if(imnth.eq.11) ivdy=iday+304
	446	if(imnth.eq.12) ivdy=iday+334
[1125]	447	iyr=iy
[911]	448	if(mod(iyr,4).eq.0.and.imnth.gt.2) ivdy=ivdy+1
	449	if(mod(iyr,100).eq.0.and.imnth.gt.2) ivdy=ivdy-1
	450	if(mod(iyr,400).eq.0.and.imnth.gt.2) ivdy=ivdy+1
[1125]	451	!
	452	END SUBROUTINE vday
[911]	453
[1125]	454	!!doctor norme for dummy arguments
[911]	455
[1125]	456	SUBROUTINE shpen( year, vd, s, h, p, en, p1 )
	457	!!----------------------------------------------------------------------
	458	!! * SUBROUTINE shpen *
	459	!!
[911]	460	!! ** Purpose : - calculate astronomical arguments for tides
	461	!! this version from d. blackman 30 nove 1990
	462	!!
[1125]	463	!!----------------------------------------------------------------------
	464	!!gm add INTENT in, out or inout.... DOCTOR name....
	465	!!gm please do not use variable name with a single letter: impossible to search in a code
	466	INTEGER :: year,vd
	467	REAL(wp) :: s,h,p,en,p1
	468	!!
	469	INTEGER :: yr,ilc,icent,it,iday,ild,ipos,nn,iyd
[911]	470	REAL(wp) :: cycle,t,td,delt(84),delta,deltat
[1125]	471	!!
	472	DATA delt /-5.04, -3.90, -2.87, -0.58, 0.71, 1.80, &
	473	& 3.08, 4.63, 5.86, 7.21, 8.58, 10.50, 12.10, &
	474	& 12.49, 14.41, 15.59, 15.81, 17.52, 19.01, 18.39, &
	475	& 19.55, 20.36, 21.01, 21.81, 21.76, 22.35, 22.68, &
	476	& 22.94, 22.93, 22.69, 22.94, 23.20, 23.31, 23.63, &
	477	& 23.47, 23.68, 23.62, 23.53, 23.59, 23.99, 23.80, &
	478	& 24.20, 24.99, 24.97, 25.72, 26.21, 26.37, 26.89, &
	479	& 27.68, 28.13, 28.94, 29.42, 29.66, 30.29, 30.96, &
	480	& 31.09, 31.59, 31.52, 31.92, 32.45, 32.91, 33.39, &
	481	& 33.80, 34.23, 34.73, 35.40, 36.14, 36.99, 37.87, &
	482	& 38.75, 39.70, 40.70, 41.68, 42.82, 43.96, 45.00, &
	483	& 45.98, 47.00, 48.03, 49.10, 50.10, 50.97, 51.81, &
	484	& 52.57 /
	485	!!----------------------------------------------------------------------
[911]	486
	487	cycle = 360.0
	488	ilc = 0
[1125]	489	icent = year / 100
	490	yr = year - icent * 100
[911]	491	t = icent - 20
	492	!
	493	! for the following equations
	494	! time origin is fixed at 00 hr of jan 1st,2000.
	495	! see notes by cartwright
	496	!
[1125]	497	!!gm old coding style, use CASE instead and avoid GOTO (obsolescence in fortran 90)
	498	!!gm obsol( 1): Arithmetic IF statement is used ===> remove this in Fortran 90
[911]	499	it = icent - 20
	500	if (it) 1,2,2
	501	1 iday = it/4 -it
	502	go to 3
	503	2 iday = (it+3)/4 - it
	504	!
	505	! t is in julian century
	506	! correction in gegorian calander where only century year divisible
	507	! by 4 is leap year.
	508	!
	509	3 continue
	510	!
	511	td = 0.0
	512	!
[1125]	513	!!gm obsol( 1): Arithmetic IF statement is used ===> remove this in Fortran 90
[911]	514	if (yr) 4,5,4
	515	!
	516	4 iyd = 365*yr
	517	ild = (yr-1)/4
	518	if((icent - (icent/4)*4) .eq. 0) ilc = 1
	519	td = iyd + ild + ilc
	520	!
	521	5 td = td + iday + vd -1.0 - 0.5
	522	t = t + (td/36525.0)
	523	!
	524	ipos=year-1899
	525	if (ipos .lt. 0) go to 7
	526	if (ipos .gt. 83) go to 6
	527	!
	528	delta = (delt(ipos+1)+delt(ipos))/2.0
	529	go to 7
	530	!
	531	6 delta= (65.0-50.5)/20.0*(year-1980)+50.5
	532	!
	533	7 deltat = delta * 1.0e-6
	534	!
[1125]	535	!!gm precision of the computation : example for s it should be replace by:
	536	!!gm s = 218.3165 + (481267.8813 - 0.0016t)t + 152.0*deltat ==> more precise modify the last digits results
[911]	537	s = 218.3165 + 481267.8813t - 0.0016tt + 152.0deltat
[1125]	538	h = 280.4661 + 36000.7698 t + 0.0003tt + 11.0deltat
	539	p = 83.3535 + 4069.0139 t - 0.0103t*t + deltat
	540	en = 234.9555 + 1934.1363 t - 0.0021t*t + deltat
	541	p1 = 282.9384 + 1.7195 t + 0.0005t*t
	542	!
	543	nn = s / cycle
	544	s = s - nn * cycle
	545	IF( s < 0.e0 ) s = s + cycle
	546	!
	547	nn = h / cycle
	548	h = h - cycle * nn
	549	IF( h < 0.e0 ) h = h + cycle
	550	!
	551	nn = p / cycle
	552	p = p - cycle * nn
	553	IF( p < 0.e0) p = p + cycle
	554	!
	555	nn = en / cycle
	556	en = en - cycle * nn
	557	IF( en < 0.e0 ) en = en + cycle
[911]	558	en = cycle - en
[1125]	559	!
	560	nn = p1 / cycle
	561	p1 = p1 - nn * cycle
	562	!
	563	END SUBROUTINE shpen
[911]	564
	565
[1125]	566	SUBROUTINE ufset( p, cn, b, a )
	567	!!----------------------------------------------------------------------
	568	!! * SUBROUTINE ufset *
	569	!!
[911]	570	!! ** Purpose : - calculate nodal parameters for the tides
	571	!!
[1125]	572	!!----------------------------------------------------------------------
	573	!!gm doctor naming of dummy argument variables!!! and all local variables
	574	!!gm nc is jptides_max ????
[911]	575	integer nc
	576	parameter (nc=15)
[1125]	577	REAL(wp) p,cn
	578	!!
	579
	580	!!gm rad is already a public variable defined in phycst.F90 .... ==> doctor norme local real start with "z"
	581	REAL(wp) :: w1, w2, w3, w4, w5, w6, w7, w8, nw, pw, rad
	582	REAL(wp) :: a(nc), b(nc)
	583	INTEGER :: ndc, k
	584	!!----------------------------------------------------------------------
[911]	585
[1125]	586	ndc = nc
	587
[911]	588	! a=f , b =u
	589	! t is zero as compared to tifa.
[1125]	590	!! use rad defined in phycst (i.e. add a USE phycst at the begining of the module
[911]	591	rad = 6.2831852d0/360.0
[1125]	592	pw = p * rad
	593	nw = cn * rad
	594	w1 = cos( nw )
	595	w2 = cos( 2*nw )
	596	w3 = cos( 3*nw )
	597	w4 = sin( nw )
	598	w5 = sin( 2*nw )
	599	w6 = sin( 3*nw )
	600	w7 = 1. - 0.2505 * COS( 2pw ) - 0.1102 COS(2*pw-nw ) &
	601	& - 0.156 * COS( 2pw-2nw ) - 0.037 * COS( nw )
	602	w8 = - 0.2505 * SIN( 2pw ) - 0.1102 SIN(2*pw-nw ) &
	603	& - 0.0156 * SIN( 2pw-2nw ) - 0.037 * SIN( nw )
	604	!
	605	a(1) = 1.0089 + 0.1871 * w1 - 0.0147 * w2 + 0.0014 * w3
	606	b(1) = 0.1885 * w4 - 0.0234 * w5 + 0.0033 * w6
	607	! q1
[911]	608	a(2) = a(1)
	609	b(2) = b(1)
[1125]	610	! o1
[911]	611	a(3) = 1.0
	612	b(3) = 0.0
[1125]	613	! p1
[911]	614	a(4) = 1.0
	615	b(4) = 0.0
[1125]	616	! s1
[911]	617	a(5) = 1.0060+0.1150w1- 0.0088w2 +0.0006*w3
	618	b(5) = -0.1546w4 + 0.0119w5 -0.0012*w6
[1125]	619	! k1
[911]	620	a(6) =1.0004 -0.0373w1+ 0.0002w2
	621	b(6) = -0.0374*w4
[1125]	622	! 2n2
[911]	623	a(7) = a(6)
	624	b(7) = b(6)
[1125]	625	! mu2
[911]	626	a(8) = a(6)
	627	b(8) = b(6)
[1125]	628	! n2
[911]	629	a(9) = a(6)
	630	b(9) = b(6)
[1125]	631	! nu2
[911]	632	a(10) = a(6)
	633	b(10) = b(6)
[1125]	634	! m2
	635	a(11) = SQRT( w7 * w7 + w8 * w8 )
	636	b(11) = ATAN( w8 / w7 )
	637	!!gmuse rpi instead of 3.141992 ??? true pi is rpi=3.141592653589793_wp ..... ????
	638	IF( w7 < 0.e0 ) b(11) = b(11) + 3.141992
	639	! l2
[911]	640	a(12) = 1.0
	641	b(12) = 0.0
[1125]	642	! t2
[911]	643	a(13)= a(12)
	644	b(13)= b(12)
[1125]	645	! s2
[911]	646	a(14) = 1.0241+0.2863w1+0.0083w2 -0.0015*w3
	647	b(14) = -0.3096w4 + 0.0119w5 - 0.0007*w6
[1125]	648	! k2
[911]	649	a(15) = a(6)*a(6)
	650	b(15) = 2*b(6)
[1125]	651	! m4
	652	!!gm old coding, remove GOTO and label of lines
	653	!!gm obsol( 1): Arithmetic IF statement is used ===> remove this in Fortran 90
	654	DO 40 k = 1,ndc
	655	b(k) = b(k)/rad
	656	32 if (b(k)) 34,35,35
	657	34 b(k) = b(k) + 360.0
	658	go to 32
	659	35 if (b(k)-360.0) 40,37,37
	660	37 b(k) = b(k)-360.0
	661	go to 35
[911]	662	40 continue
[1125]	663	!
	664	END SUBROUTINE ufset
	665
[911]	666
[1125]	667	SUBROUTINE vset( s,h,p,en,p1,v)
	668	!!----------------------------------------------------------------------
	669	!! * SUBROUTINE vset *
	670	!!
[911]	671	!! ** Purpose : - calculate tidal phases for 0000gmt on start day of run
	672	!!
[1125]	673	!!----------------------------------------------------------------------
	674	!!gm doctor naming of dummy argument variables!!! and all local variables
	675	!!gm nc is jptides_max ????
	676	!!gm en argument is not used: suppress it ?
[911]	677	integer nc
	678	parameter (nc=15)
	679	real(wp) s,h,p,en,p1
	680	real(wp) v(nc)
[1125]	681	!!
	682	integer ndc, k
	683	!!----------------------------------------------------------------------
[911]	684
	685	ndc = nc
[1125]	686	! v s are computed here.
	687	v(1) =-3*s +h +p +270 ! Q1
	688	v(2) =-2*s +h +270.0 ! O1
	689	v(3) =-h +270 ! P1
	690	v(4) =180 ! S1
	691	v(5) =h +90.0 ! K1
	692	v(6) =-4s +2h +2*p ! 2N2
	693	v(7) =-4*(s-h) ! MU2
	694	v(8) =-3s +2h +p ! N2
	695	v(9) =-3s +4h -p ! MU2
	696	v(10) =-2s +2h ! M2
	697	v(11) =-s +2*h -p +180 ! L2
	698	v(12) =-h +p1 ! T2
	699	v(13) =0 ! S2
	700	v(14) =h+h ! K2
	701	v(15) =2*v(10) ! M4
[911]	702	!
[1125]	703	!!gm old coding, remove GOTO and label of lines
	704	!!gm obsol( 1): Arithmetic IF statement is used ===> remove this in Fortran 90
[911]	705	do 72 k = 1, ndc
[1125]	706	69 if( v(k) ) 70,71,71
	707	70 v(k) = v(k)+360.0
	708	go to 69
	709	71 if( v(k) - 360.0 ) 72,73,73
	710	73 v(k) = v(k)-360.0
	711	go to 71
[911]	712	72 continue
[1125]	713	!
	714	END SUBROUTINE vset
[911]	715
	716	#else
[1125]	717	!!----------------------------------------------------------------------
	718	!! Dummy module NO Unstruct Open Boundary Conditions for tides
	719	!!----------------------------------------------------------------------
	720	!!gm are you sure we need to define filtide and tide_cpt ?
	721	CHARACTER(len=80), PUBLIC :: filtide !: Filename root for tidal input files
	722	CHARACTER(len=4 ), PUBLIC, DIMENSION(1) :: tide_cpt !: Names of tidal components used.
[911]	723
	724	CONTAINS
[1125]	725	SUBROUTINE tide_init ! Empty routine
[911]	726	END SUBROUTINE tide_init
[1125]	727	SUBROUTINE tide_data ! Empty routine
[911]	728	END SUBROUTINE tide_data
[1125]	729	SUBROUTINE tide_update( kt, kit ) ! Empty routine
	730	WRITE(,) 'tide_update: You should not have seen this print! error?', kt, kit
[911]	731	END SUBROUTINE tide_update
	732	#endif
	733
[1125]	734	!!======================================================================
[911]	735	END MODULE bdytides

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