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bdytides.F90 in branches/DEV_r1986_BDY_updates/NEMO/OPA_SRC/BDY – NEMO

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source: branches/DEV_r1986_BDY_updates/NEMO/OPA_SRC/BDY/bdytides.F90 @ 2093

Last change on this file since 2093 was 2093, checked in by davestorkey, 14 years ago
Main change set.
Property svn:executable set to ``* 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
[2093]	9	!! 3.3 ! 2010-09 (D.Storkey and E.O'Dea) bug fixes
[1125]	10	!!----------------------------------------------------------------------
	11	#if defined key_bdy
	12	!!----------------------------------------------------------------------
	13	!! 'key_bdy' Unstructured Open Boundary Condition
	14	!!----------------------------------------------------------------------
[911]	15	!! PUBLIC
[1125]	16	!! tide_init : read of namelist
	17	!! tide_data : read in and initialisation of tidal constituents at boundary
	18	!! tide_update : calculation of tidal forcing at each timestep
[911]	19	!! PRIVATE
[1125]	20	!! uvset :\
	21	!! vday : \| Routines to correct tidal harmonics forcing for
	22	!! shpen : \| start time of integration
	23	!! ufset : \|
	24	!! vset :/
	25	!!----------------------------------------------------------------------
[911]	26	USE oce ! ocean dynamics and tracers
	27	USE dom_oce ! ocean space and time domain
	28	USE iom
	29	USE in_out_manager ! I/O units
	30	USE phycst ! physical constants
	31	USE lbclnk ! ocean lateral boundary conditions (or mpp link)
	32	USE bdy_par ! Unstructured boundary parameters
	33	USE bdy_oce ! ocean open boundary conditions
[2093]	34	USE daymod ! calendar
[1125]	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
[1125]	43	LOGICAL, PUBLIC :: ln_tide_date !: =T correct tide phases and amplitude for model start date
[911]	44
[2093]	45	INTEGER, PARAMETER,PUBLIC :: jptides_max = 15 !: Max number of tidal contituents
	46	INTEGER, PUBLIC :: ntide !: Actual number of tidal constituents
[911]	47
[1125]	48	CHARACTER(len=80), PUBLIC :: filtide !: Filename root for tidal input files
	49	CHARACTER(len= 4), PUBLIC, DIMENSION(jptides_max) :: tide_cpt !: Names of tidal components used.
[911]	50
[2093]	51	INTEGER , DIMENSION(jptides_max), PUBLIC :: nindx !: ???
	52	REAL(wp), DIMENSION(jptides_max), PUBLIC :: tide_speed !: Phase speed of tidal constituent (deg/hr)
[911]	53
[1125]	54	REAL(wp), DIMENSION(jpbdim,jptides_max) :: ssh1, ssh2 !: Tidal constituents : SSH
	55	REAL(wp), DIMENSION(jpbdim,jptides_max) :: u1 , u2 !: Tidal constituents : U
	56	REAL(wp), DIMENSION(jpbdim,jptides_max) :: v1 , v2 !: Tidal constituents : V
[911]	57
[1125]	58	!!----------------------------------------------------------------------
	59	!! NEMO/OPA 3.0 , LOCEAN-IPSL (2008)
[1146]	60	!! $Id$
[1125]	61	!! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt)
	62	!!----------------------------------------------------------------------
[911]	63
	64	CONTAINS
	65
	66	SUBROUTINE tide_init
[1125]	67	!!----------------------------------------------------------------------
	68	!! * SUBROUTINE tide_init *
	69	!!
[911]	70	!! ** Purpose : - Read in namelist for tides
	71	!!
	72	!!----------------------------------------------------------------------
[1125]	73	INTEGER :: itide ! dummy loop index
	74	!!
[1601]	75	NAMELIST/nambdy_tide/ln_tide_date, filtide, tide_cpt, tide_speed
[1125]	76	!!----------------------------------------------------------------------
[911]	77
	78	IF(lwp) WRITE(numout,*)
	79	IF(lwp) WRITE(numout,*) 'tide_init : initialization of tidal harmonic forcing at open boundaries'
	80	IF(lwp) WRITE(numout,*) '~~~~~~~~~'
	81
[1601]	82	! Namelist nambdy_tide : tidal harmonic forcing at open boundaries
[1125]	83	ln_tide_date = .false.
	84	filtide(:) = ''
	85	tide_speed(:) = 0.0
	86	tide_cpt(:) = ''
	87	REWIND( numnam ) ! Read namelist parameters
[1601]	88	READ ( numnam, nambdy_tide )
[1125]	89	! ! Count number of components specified
[2093]	90	ntide=jptides_max
	91	do itide = 1, jptides_max
	92	if ( tide_cpt(itide) == '' ) then
	93	ntide = itide-1
	94	exit
	95	endif
	96	enddo
	97
[1125]	98	! ! find constituents in standard list
	99	DO itide = 1, ntide
	100	nindx(itide) = 0
	101	IF( TRIM( tide_cpt(itide) ) == 'Q1' ) nindx(itide) = 1
	102	IF( TRIM( tide_cpt(itide) ) == 'O1' ) nindx(itide) = 2
	103	IF( TRIM( tide_cpt(itide) ) == 'P1' ) nindx(itide) = 3
	104	IF( TRIM( tide_cpt(itide) ) == 'S1' ) nindx(itide) = 4
	105	IF( TRIM( tide_cpt(itide) ) == 'K1' ) nindx(itide) = 5
	106	IF( TRIM( tide_cpt(itide) ) == '2N2' ) nindx(itide) = 6
	107	IF( TRIM( tide_cpt(itide) ) == 'MU2' ) nindx(itide) = 7
	108	IF( TRIM( tide_cpt(itide) ) == 'N2' ) nindx(itide) = 8
	109	IF( TRIM( tide_cpt(itide) ) == 'NU2' ) nindx(itide) = 9
	110	IF( TRIM( tide_cpt(itide) ) == 'M2' ) nindx(itide) = 10
	111	IF( TRIM( tide_cpt(itide) ) == 'L2' ) nindx(itide) = 11
	112	IF( TRIM( tide_cpt(itide) ) == 'T2' ) nindx(itide) = 12
	113	IF( TRIM( tide_cpt(itide) ) == 'S2' ) nindx(itide) = 13
	114	IF( TRIM( tide_cpt(itide) ) == 'K2' ) nindx(itide) = 14
	115	IF( TRIM( tide_cpt(itide) ) == 'M4' ) nindx(itide) = 15
	116	IF( nindx(itide) == 0 .AND. lwp ) THEN
	117	WRITE(ctmp1,*) 'constitunent', itide,':', tide_cpt(itide), 'not in standard list'
	118	CALL ctl_warn( ctmp1 )
	119	ENDIF
	120	END DO
	121	! ! Parameter control and print
	122	IF( ntide < 1 ) THEN
[1601]	123	CALL ctl_stop( ' Did not find any tidal components in namelist nambdy_tide' )
[1125]	124	ELSE
[1601]	125	IF(lwp) WRITE(numout,*) ' Namelist nambdy_tide : tidal harmonic forcing at open boundaries'
[1125]	126	IF(lwp) WRITE(numout,*) ' tidal components specified ', ntide
	127	IF(lwp) WRITE(numout,*) ' ', tide_cpt(1:ntide)
	128	IF(lwp) WRITE(numout,*) ' associated phase speeds (deg/hr) : '
	129	IF(lwp) WRITE(numout,*) ' ', tide_speed(1:ntide)
	130	ENDIF
[911]	131
	132	! Initialisation of tidal harmonics arrays
	133	sshtide(:) = 0.e0
[1125]	134	utide (:) = 0.e0
	135	vtide (:) = 0.e0
	136	!
[911]	137	END SUBROUTINE tide_init
	138
[1125]	139
[911]	140	SUBROUTINE tide_data
[1125]	141	!!----------------------------------------------------------------------
	142	!! * SUBROUTINE tide_data *
	143	!!
	144	!! ** Purpose : - Read in tidal harmonics data and adjust for the start
	145	!! time of the model run.
[911]	146	!!
[1125]	147	!!----------------------------------------------------------------------
	148	INTEGER :: itide, igrd, ib ! dummy loop indices
	149	CHARACTER(len=80) :: clfile ! full file name for tidal input file
[911]	150	INTEGER :: ipi, ipj, inum, idvar ! temporary integers (netcdf read)
[2093]	151	INTEGER, DIMENSION(6) :: lendta=0 ! length of data in the file (note may be different from nblendta!)
[1125]	152	REAL(wp) :: z_arg, z_atde, z_btde, z1t, z2t
	153	REAL(wp), DIMENSION(jpbdta,1) :: zdta ! temporary array for data fields
	154	REAL(wp), DIMENSION(jptides_max) :: z_vplu, z_ftc
[911]	155	!!------------------------------------------------------------------------------
	156
[1125]	157	! Open files and read in tidal forcing data
	158	! -----------------------------------------
[911]	159
	160	ipj = 1
	161
[1125]	162	DO itide = 1, ntide
	163	! ! SSH fields
	164	clfile = TRIM(filtide)//TRIM(tide_cpt(itide))//'_grid_T.nc'
	165	IF(lwp) WRITE(numout,*) 'Reading data from file ', clfile
	166	CALL iom_open( clfile, inum )
[2093]	167	igrd = 4
[1125]	168	IF( nblendta(igrd) <= 0 ) THEN
	169	idvar = iom_varid( inum,'z1' )
	170	IF(lwp) WRITE(numout,*) 'iom_file(1)%ndims(idvar) : ',iom_file%ndims(idvar)
	171	nblendta(igrd) = iom_file(inum)%dimsz(1,idvar)
	172	WRITE(numout,*) 'Dim size for z1 is ', nblendta(igrd)
[911]	173	ENDIF
[1125]	174	ipi = nblendta(igrd)
	175	CALL iom_get( inum, jpdom_unknown, 'z1', zdta(1:ipi,1:ipj) )
	176	DO ib = 1, nblenrim(igrd)
	177	ssh1(ib,itide) = zdta(nbmap(ib,igrd),1)
[911]	178	END DO
[1125]	179	CALL iom_get( inum, jpdom_unknown, 'z2', zdta(1:ipi,1:ipj) )
	180	DO ib = 1, nblenrim(igrd)
	181	ssh2(ib,itide) = zdta(nbmap(ib,igrd),1)
[911]	182	END DO
	183	CALL iom_close( inum )
[1125]	184	!
	185	! ! U fields
	186	clfile = TRIM(filtide)//TRIM(tide_cpt(itide))//'_grid_U.nc'
	187	IF(lwp) WRITE(numout,*) 'Reading data from file ', clfile
	188	CALL iom_open( clfile, inum )
[2093]	189	igrd = 5
[1125]	190	IF( lendta(igrd) <= 0 ) THEN
	191	idvar = iom_varid( inum,'u1' )
	192	lendta(igrd) = iom_file(inum)%dimsz(1,idvar)
	193	WRITE(numout,*) 'Dim size for u1 is ',lendta(igrd)
[911]	194	ENDIF
[1125]	195	ipi = lendta(igrd)
	196	CALL iom_get( inum, jpdom_unknown, 'u1', zdta(1:ipi,1:ipj) )
	197	DO ib = 1, nblenrim(igrd)
	198	u1(ib,itide) = zdta(nbmap(ib,igrd),1)
[911]	199	END DO
[1125]	200	CALL iom_get( inum, jpdom_unknown, 'u2', zdta(1:ipi,1:ipj) )
	201	DO ib = 1, nblenrim(igrd)
	202	u2(ib,itide) = zdta(nbmap(ib,igrd),1)
[911]	203	END DO
	204	CALL iom_close( inum )
[1125]	205	!
	206	! ! V fields
	207	clfile = TRIM(filtide)//TRIM(tide_cpt(itide))//'_grid_V.nc'
	208	if(lwp) write(numout,*) 'Reading data from file ', clfile
	209	CALL iom_open( clfile, inum )
[2093]	210	igrd = 6
[1125]	211	IF( lendta(igrd) <= 0 ) THEN
	212	idvar = iom_varid( inum,'v1' )
	213	lendta(igrd) = iom_file(inum)%dimsz(1,idvar)
	214	WRITE(numout,*) 'Dim size for v1 is ', lendta(igrd)
[911]	215	ENDIF
[1125]	216	ipi = lendta(igrd)
	217	CALL iom_get( inum, jpdom_unknown, 'v1', zdta(1:ipi,1:ipj) )
	218	DO ib = 1, nblenrim(igrd)
	219	v1(ib,itide) = zdta(nbmap(ib,igrd),1)
[911]	220	END DO
[1125]	221	CALL iom_get( inum, jpdom_unknown, 'v2', zdta(1:ipi,1:ipj) )
	222	DO ib=1, nblenrim(igrd)
	223	v2(ib,itide) = zdta(nbmap(ib,igrd),1)
[911]	224	END DO
	225	CALL iom_close( inum )
[1125]	226	!
	227	END DO ! end loop on tidal components
[911]	228
[1125]	229	IF( ln_tide_date ) THEN ! correct for date factors
[911]	230
[1125]	231	!! used nmonth, nyear and nday from daymod....
	232	! Calculate date corrects for 15 standard consituents
	233	! This is the initialisation step, so nday, nmonth, nyear are the
	234	! initial date/time of the integration.
[1462]	235	print *, nday,nmonth,nyear
	236	nyear = int(ndate0 / 10000 ) ! initial year
	237	nmonth = int((ndate0 - nyear * 10000 ) / 100 ) ! initial month
	238	nday = int(ndate0 - nyear * 10000 - nmonth * 100)
[911]	239
[1125]	240	CALL uvset( 0, nday, nmonth, nyear, z_ftc, z_vplu )
[911]	241
[1125]	242	IF(lwp) WRITE(numout,*) 'Correcting tide for date:', nday, nmonth, nyear
[911]	243
[1125]	244	DO itide = 1, ntide ! loop on tidal components
	245	!
	246	IF( nindx(itide) /= 0 ) THEN
	247	!!gm use rpi and rad global variable
	248	z_arg = 3.14159265d0 * z_vplu(nindx(itide)) / 180.0d0
	249	z_atde=z_ftc(nindx(itide))*cos(z_arg)
	250	z_btde=z_ftc(nindx(itide))*sin(z_arg)
	251	IF(lwp) WRITE(numout,'(2i5,8f10.6)') itide, nindx(itide), tide_speed(itide), &
	252	& z_ftc(nindx(itide)), z_vplu(nindx(itide))
	253	ELSE
	254	z_atde = 1.0_wp
	255	z_btde = 0.0_wp
	256	ENDIF
	257	! ! elevation
[2093]	258	igrd = 4
[1125]	259	DO ib = 1, nblenrim(igrd)
	260	z1t = z_atde * ssh1(ib,itide) + z_btde * ssh2(ib,itide)
	261	z2t = z_atde * ssh2(ib,itide) - z_btde * ssh1(ib,itide)
	262	ssh1(ib,itide) = z1t
	263	ssh2(ib,itide) = z2t
	264	END DO
	265	! ! u
[2093]	266	igrd = 5
[1125]	267	DO ib = 1, nblenrim(igrd)
	268	z1t = z_atde * u1(ib,itide) + z_btde * u2(ib,itide)
	269	z2t = z_atde * u2(ib,itide) - z_btde * u1(ib,itide)
	270	u1(ib,itide) = z1t
	271	u2(ib,itide) = z2t
	272	END DO
	273	! ! v
[2093]	274	igrd = 6
[1125]	275	DO ib = 1, nblenrim(igrd)
	276	z1t = z_atde * v1(ib,itide) + z_btde * v2(ib,itide)
	277	z2t = z_atde * v2(ib,itide) - z_btde * v1(ib,itide)
	278	v1(ib,itide) = z1t
	279	v2(ib,itide) = z2t
	280	END DO
	281	!
	282	END DO ! end loop on tidal components
	283	!
	284	ENDIF ! date correction
	285	!
[911]	286	END SUBROUTINE tide_data
	287
[1125]	288
[911]	289	SUBROUTINE tide_update ( kt, jit )
[1125]	290	!!----------------------------------------------------------------------
	291	!! * SUBROUTINE tide_update *
	292	!!
[911]	293	!! ** Purpose : - Add tidal forcing to sshbdy, ubtbdy and vbtbdy arrays.
	294	!!
[1125]	295	!!----------------------------------------------------------------------
[911]	296	INTEGER, INTENT( in ) :: kt ! Main timestep counter
[1125]	297	!!gm doctor jit ==> kit
[911]	298	INTEGER, INTENT( in ) :: jit ! Barotropic timestep counter (for timesplitting option)
[1125]	299	!!
	300	INTEGER :: itide, igrd, ib ! dummy loop indices
	301	REAL(wp) :: z_arg, z_sarg !
	302	REAL(wp), DIMENSION(jptides_max) :: z_sist, z_cost
	303	!!----------------------------------------------------------------------
[911]	304
	305	! Note tide phase speeds are in deg/hour, so we need to convert the
	306	! elapsed time in seconds to hours by dividing by 3600.0
[1125]	307	IF( jit == 0 ) THEN
	308	z_arg = kt * rdt * rad / 3600.0
	309	ELSE ! we are in a barotropic subcycle (for timesplitting option)
[1462]	310	! z_arg = ( (kt-1) * rdt + jit * rdt / REAL(nn_baro,lwp) ) * rad / 3600.0
	311	z_arg = ( (kt-1) * rdt + jit * rdt / REAL(nn_baro,wp) ) * rad / 3600.0
[1125]	312	ENDIF
[911]	313
[1125]	314	DO itide = 1, ntide
	315	z_sarg = z_arg * tide_speed(itide)
	316	z_cost(itide) = COS( z_sarg )
	317	z_sist(itide) = SIN( z_sarg )
	318	END DO
[911]	319
[1125]	320	! summing of tidal constituents into BDY arrays
[911]	321	sshtide(:) = 0.0
[1125]	322	utide (:) = 0.0
	323	vtide (:) = 0.0
	324	!
	325	DO itide = 1, ntide
[2093]	326	igrd=4 ! SSH on tracer grid.
[1125]	327	DO ib = 1, nblenrim(igrd)
	328	sshtide(ib) =sshtide(ib)+ ssh1(ib,itide)z_cost(itide) + ssh2(ib,itide)z_sist(itide)
	329	! if(lwp) write(numout,*) 'z',ib,itide,sshtide(ib), ssh1(ib,itide),ssh2(ib,itide)
	330	END DO
[2093]	331	igrd=5 ! U grid
[1125]	332	DO ib=1, nblenrim(igrd)
	333	utide(ib) = utide(ib)+ u1(ib,itide)z_cost(itide) + u2(ib,itide)z_sist(itide)
	334	! if(lwp) write(numout,*) 'u',ib,itide,utide(ib), u1(ib,itide),u2(ib,itide)
	335	END DO
[2093]	336	igrd=6 ! V grid
[1125]	337	DO ib=1, nblenrim(igrd)
	338	vtide(ib) = vtide(ib)+ v1(ib,itide)z_cost(itide) + v2(ib,itide)z_sist(itide)
	339	! if(lwp) write(numout,*) 'v',ib,itide,vtide(ib), v1(ib,itide),v2(ib,itide)
	340	END DO
	341	END DO
	342	!
	343	END SUBROUTINE tide_update
[911]	344
[1125]	345	!!gm doctor naming of dummy argument variables!!! and all local variables
[911]	346
[1125]	347	SUBROUTINE uvset( ihs, iday, imnth, iyr, f, z_vplu )
	348	!!----------------------------------------------------------------------
	349	!! * SUBROUTINE uvset *
	350	!!
[911]	351	!! ** Purpose : - adjust tidal forcing for date factors
	352	!!
[1125]	353	!!----------------------------------------------------------------------
[911]	354	implicit none
	355	INTEGER, INTENT( in ) :: ihs ! Start time hours
	356	INTEGER, INTENT( in ) :: iday ! start time days
[1125]	357	INTEGER, INTENT( in ) :: imnth ! start time month
	358	INTEGER, INTENT( in ) :: iyr ! start time year
	359	!!
	360	!!gm nc is jptides_max ????
	361	INTEGER , PARAMETER :: nc =15 ! maximum number of constituents
[911]	362	CHARACTER(len=8), DIMENSION(nc) :: cname
[1125]	363	INTEGER :: year, vd, ivdy, ndc, i, k
	364	REAL(wp) :: ss, h, p, en, p1, rtd
	365	REAL(wp), DIMENSION(nc) :: f ! nodal correction
	366	REAL(wp), DIMENSION(nc) :: z_vplu ! phase correction
	367	REAL(wp), DIMENSION(nc) :: u, v, zig
	368	!!
	369	DATA cname/ 'q1' , 'o1' , 'p1' , 's1' , 'k1' , &
	370	& '2n2' , 'mu2' , 'n2' , 'nu2' , 'm2' , &
	371	& 'l2' , 't2' , 's2' , 'k2' , 'm4' /
	372	DATA zig/ .2338507481, .2433518789, .2610826055, .2617993878, .2625161701, &
	373	& .4868657873, .4881373225, .4963669182, .4976384533, .5058680490, &
	374	& .5153691799, .5228820265, .5235987756, .5250323419, 1.011736098 /
	375	!!----------------------------------------------------------------------
[911]	376	!
	377	! ihs - start time gmt on ...
	378	! iday/imnth/iyr - date e.g. 12/10/87
	379	!
[1125]	380	CALL vday(iday,imnth,iyr,ivdy)
	381	vd = ivdy
[911]	382	!
	383	!rp note change of year number for d. blackman shpen
	384	!rp if(iyr.ge.1000) year=iyr-1900
	385	!rp if(iyr.lt.1000) year=iyr
	386	year = iyr
	387	!
	388	!.....year = year of required data
	389	!.....vd = day of required data..set up for 0000gmt day year
	390	ndc = nc
	391	!.....ndc = number of constituents allowed
[1125]	392	!!gm use rpi ?
	393	rtd = 360.0 / 6.2831852
	394	DO i = 1, ndc
	395	zig(i) = zig(i)*rtd
	396	! sigo(i)= zig(i)
	397	END DO
	398
	399	!!gm try to avoid RETURN in F90
	400	IF( year == 0 ) RETURN
[911]	401
[1125]	402	CALL shpen( year, vd, ss, h , p , en, p1 )
	403	CALL ufset( p , en, u , f )
	404	CALL vset ( ss , h , p , en, p1, v )
	405	!
	406	DO k = 1, nc
	407	z_vplu(k) = v(k) + u(k)
	408	z_vplu(k) = z_vplu(k) + dble(ihs) * zig(k)
	409	DO WHILE( z_vplu(k) < 0 )
	410	z_vplu(k) = z_vplu(k) + 360.0
	411	END DO
	412	DO WHILE( z_vplu(k) > 360. )
	413	z_vplu(k) = z_vplu(k) - 360.0
	414	END DO
	415	END DO
	416	!
[911]	417	END SUBROUTINE uvset
	418
	419
[1125]	420	SUBROUTINE vday( iday, imnth, iy, ivdy )
	421	!!----------------------------------------------------------------------
	422	!! * SUBROUTINE vday *
	423	!!
[911]	424	!! ** Purpose : - adjust tidal forcing for date factors
	425	!!
[1125]	426	!!----------------------------------------------------------------------
	427	INTEGER, INTENT(in ) :: iday, imnth, iy ! ????
	428	INTEGER, INTENT( out) :: ivdy ! ???
	429	!!
	430	INTEGER :: iyr
[911]	431	!!------------------------------------------------------------------------------
	432
[1125]	433	!!gm nday_year in day mode is the variable compiuted here, no?
	434	!!gm nday_year , & !: curent day counted from jan 1st of the current year
	435
	436	!calculate day number in year from day/month/year
[911]	437	if(imnth.eq.1) ivdy=iday
	438	if(imnth.eq.2) ivdy=iday+31
	439	if(imnth.eq.3) ivdy=iday+59
	440	if(imnth.eq.4) ivdy=iday+90
	441	if(imnth.eq.5) ivdy=iday+120
	442	if(imnth.eq.6) ivdy=iday+151
	443	if(imnth.eq.7) ivdy=iday+181
	444	if(imnth.eq.8) ivdy=iday+212
	445	if(imnth.eq.9) ivdy=iday+243
	446	if(imnth.eq.10) ivdy=iday+273
	447	if(imnth.eq.11) ivdy=iday+304
	448	if(imnth.eq.12) ivdy=iday+334
[1125]	449	iyr=iy
[911]	450	if(mod(iyr,4).eq.0.and.imnth.gt.2) ivdy=ivdy+1
	451	if(mod(iyr,100).eq.0.and.imnth.gt.2) ivdy=ivdy-1
	452	if(mod(iyr,400).eq.0.and.imnth.gt.2) ivdy=ivdy+1
[1125]	453	!
	454	END SUBROUTINE vday
[911]	455
[1125]	456	!!doctor norme for dummy arguments
[911]	457
[1125]	458	SUBROUTINE shpen( year, vd, s, h, p, en, p1 )
	459	!!----------------------------------------------------------------------
	460	!! * SUBROUTINE shpen *
	461	!!
[911]	462	!! ** Purpose : - calculate astronomical arguments for tides
	463	!! this version from d. blackman 30 nove 1990
	464	!!
[1125]	465	!!----------------------------------------------------------------------
	466	!!gm add INTENT in, out or inout.... DOCTOR name....
	467	!!gm please do not use variable name with a single letter: impossible to search in a code
	468	INTEGER :: year,vd
	469	REAL(wp) :: s,h,p,en,p1
	470	!!
	471	INTEGER :: yr,ilc,icent,it,iday,ild,ipos,nn,iyd
[911]	472	REAL(wp) :: cycle,t,td,delt(84),delta,deltat
[1125]	473	!!
	474	DATA delt /-5.04, -3.90, -2.87, -0.58, 0.71, 1.80, &
	475	& 3.08, 4.63, 5.86, 7.21, 8.58, 10.50, 12.10, &
	476	& 12.49, 14.41, 15.59, 15.81, 17.52, 19.01, 18.39, &
	477	& 19.55, 20.36, 21.01, 21.81, 21.76, 22.35, 22.68, &
	478	& 22.94, 22.93, 22.69, 22.94, 23.20, 23.31, 23.63, &
	479	& 23.47, 23.68, 23.62, 23.53, 23.59, 23.99, 23.80, &
	480	& 24.20, 24.99, 24.97, 25.72, 26.21, 26.37, 26.89, &
	481	& 27.68, 28.13, 28.94, 29.42, 29.66, 30.29, 30.96, &
	482	& 31.09, 31.59, 31.52, 31.92, 32.45, 32.91, 33.39, &
	483	& 33.80, 34.23, 34.73, 35.40, 36.14, 36.99, 37.87, &
	484	& 38.75, 39.70, 40.70, 41.68, 42.82, 43.96, 45.00, &
	485	& 45.98, 47.00, 48.03, 49.10, 50.10, 50.97, 51.81, &
	486	& 52.57 /
	487	!!----------------------------------------------------------------------
[911]	488
	489	cycle = 360.0
	490	ilc = 0
[1125]	491	icent = year / 100
	492	yr = year - icent * 100
[911]	493	t = icent - 20
	494	!
	495	! for the following equations
	496	! time origin is fixed at 00 hr of jan 1st,2000.
	497	! see notes by cartwright
	498	!
[1125]	499	!!gm old coding style, use CASE instead and avoid GOTO (obsolescence in fortran 90)
	500	!!gm obsol( 1): Arithmetic IF statement is used ===> remove this in Fortran 90
[911]	501	it = icent - 20
	502	if (it) 1,2,2
	503	1 iday = it/4 -it
	504	go to 3
	505	2 iday = (it+3)/4 - it
	506	!
	507	! t is in julian century
	508	! correction in gegorian calander where only century year divisible
	509	! by 4 is leap year.
	510	!
	511	3 continue
	512	!
	513	td = 0.0
	514	!
[1125]	515	!!gm obsol( 1): Arithmetic IF statement is used ===> remove this in Fortran 90
[911]	516	if (yr) 4,5,4
	517	!
	518	4 iyd = 365*yr
	519	ild = (yr-1)/4
	520	if((icent - (icent/4)*4) .eq. 0) ilc = 1
	521	td = iyd + ild + ilc
	522	!
	523	5 td = td + iday + vd -1.0 - 0.5
	524	t = t + (td/36525.0)
	525	!
	526	ipos=year-1899
	527	if (ipos .lt. 0) go to 7
	528	if (ipos .gt. 83) go to 6
	529	!
	530	delta = (delt(ipos+1)+delt(ipos))/2.0
	531	go to 7
	532	!
	533	6 delta= (65.0-50.5)/20.0*(year-1980)+50.5
	534	!
	535	7 deltat = delta * 1.0e-6
	536	!
[1125]	537	!!gm precision of the computation : example for s it should be replace by:
	538	!!gm s = 218.3165 + (481267.8813 - 0.0016t)t + 152.0*deltat ==> more precise modify the last digits results
[911]	539	s = 218.3165 + 481267.8813t - 0.0016tt + 152.0deltat
[1125]	540	h = 280.4661 + 36000.7698 t + 0.0003tt + 11.0deltat
	541	p = 83.3535 + 4069.0139 t - 0.0103t*t + deltat
	542	en = 234.9555 + 1934.1363 t - 0.0021t*t + deltat
	543	p1 = 282.9384 + 1.7195 t + 0.0005t*t
	544	!
	545	nn = s / cycle
	546	s = s - nn * cycle
	547	IF( s < 0.e0 ) s = s + cycle
	548	!
	549	nn = h / cycle
	550	h = h - cycle * nn
	551	IF( h < 0.e0 ) h = h + cycle
	552	!
	553	nn = p / cycle
	554	p = p - cycle * nn
	555	IF( p < 0.e0) p = p + cycle
	556	!
	557	nn = en / cycle
	558	en = en - cycle * nn
	559	IF( en < 0.e0 ) en = en + cycle
[911]	560	en = cycle - en
[1125]	561	!
	562	nn = p1 / cycle
	563	p1 = p1 - nn * cycle
	564	!
	565	END SUBROUTINE shpen
[911]	566
	567
[1125]	568	SUBROUTINE ufset( p, cn, b, a )
	569	!!----------------------------------------------------------------------
	570	!! * SUBROUTINE ufset *
	571	!!
[911]	572	!! ** Purpose : - calculate nodal parameters for the tides
	573	!!
[1125]	574	!!----------------------------------------------------------------------
	575	!!gm doctor naming of dummy argument variables!!! and all local variables
	576	!!gm nc is jptides_max ????
[911]	577	integer nc
	578	parameter (nc=15)
[1125]	579	REAL(wp) p,cn
	580	!!
	581
	582	!!gm rad is already a public variable defined in phycst.F90 .... ==> doctor norme local real start with "z"
	583	REAL(wp) :: w1, w2, w3, w4, w5, w6, w7, w8, nw, pw, rad
	584	REAL(wp) :: a(nc), b(nc)
	585	INTEGER :: ndc, k
	586	!!----------------------------------------------------------------------
[911]	587
[1125]	588	ndc = nc
	589
[911]	590	! a=f , b =u
	591	! t is zero as compared to tifa.
[1125]	592	!! use rad defined in phycst (i.e. add a USE phycst at the begining of the module
[911]	593	rad = 6.2831852d0/360.0
[1125]	594	pw = p * rad
	595	nw = cn * rad
	596	w1 = cos( nw )
	597	w2 = cos( 2*nw )
	598	w3 = cos( 3*nw )
	599	w4 = sin( nw )
	600	w5 = sin( 2*nw )
	601	w6 = sin( 3*nw )
	602	w7 = 1. - 0.2505 * COS( 2pw ) - 0.1102 COS(2*pw-nw ) &
	603	& - 0.156 * COS( 2pw-2nw ) - 0.037 * COS( nw )
	604	w8 = - 0.2505 * SIN( 2pw ) - 0.1102 SIN(2*pw-nw ) &
	605	& - 0.0156 * SIN( 2pw-2nw ) - 0.037 * SIN( nw )
	606	!
	607	a(1) = 1.0089 + 0.1871 * w1 - 0.0147 * w2 + 0.0014 * w3
	608	b(1) = 0.1885 * w4 - 0.0234 * w5 + 0.0033 * w6
	609	! q1
[911]	610	a(2) = a(1)
	611	b(2) = b(1)
[1125]	612	! o1
[911]	613	a(3) = 1.0
	614	b(3) = 0.0
[1125]	615	! p1
[911]	616	a(4) = 1.0
	617	b(4) = 0.0
[1125]	618	! s1
[911]	619	a(5) = 1.0060+0.1150w1- 0.0088w2 +0.0006*w3
	620	b(5) = -0.1546w4 + 0.0119w5 -0.0012*w6
[1125]	621	! k1
[911]	622	a(6) =1.0004 -0.0373w1+ 0.0002w2
	623	b(6) = -0.0374*w4
[1125]	624	! 2n2
[911]	625	a(7) = a(6)
	626	b(7) = b(6)
[1125]	627	! mu2
[911]	628	a(8) = a(6)
	629	b(8) = b(6)
[1125]	630	! n2
[911]	631	a(9) = a(6)
	632	b(9) = b(6)
[1125]	633	! nu2
[911]	634	a(10) = a(6)
	635	b(10) = b(6)
[1125]	636	! m2
	637	a(11) = SQRT( w7 * w7 + w8 * w8 )
	638	b(11) = ATAN( w8 / w7 )
	639	!!gmuse rpi instead of 3.141992 ??? true pi is rpi=3.141592653589793_wp ..... ????
	640	IF( w7 < 0.e0 ) b(11) = b(11) + 3.141992
	641	! l2
[911]	642	a(12) = 1.0
	643	b(12) = 0.0
[1125]	644	! t2
[911]	645	a(13)= a(12)
	646	b(13)= b(12)
[1125]	647	! s2
[911]	648	a(14) = 1.0241+0.2863w1+0.0083w2 -0.0015*w3
	649	b(14) = -0.3096w4 + 0.0119w5 - 0.0007*w6
[1125]	650	! k2
[911]	651	a(15) = a(6)*a(6)
	652	b(15) = 2*b(6)
[1125]	653	! m4
	654	!!gm old coding, remove GOTO and label of lines
	655	!!gm obsol( 1): Arithmetic IF statement is used ===> remove this in Fortran 90
	656	DO 40 k = 1,ndc
	657	b(k) = b(k)/rad
	658	32 if (b(k)) 34,35,35
	659	34 b(k) = b(k) + 360.0
	660	go to 32
	661	35 if (b(k)-360.0) 40,37,37
	662	37 b(k) = b(k)-360.0
	663	go to 35
[911]	664	40 continue
[1125]	665	!
	666	END SUBROUTINE ufset
	667
[911]	668
[1125]	669	SUBROUTINE vset( s,h,p,en,p1,v)
	670	!!----------------------------------------------------------------------
	671	!! * SUBROUTINE vset *
	672	!!
[911]	673	!! ** Purpose : - calculate tidal phases for 0000gmt on start day of run
	674	!!
[1125]	675	!!----------------------------------------------------------------------
	676	!!gm doctor naming of dummy argument variables!!! and all local variables
	677	!!gm nc is jptides_max ????
	678	!!gm en argument is not used: suppress it ?
[911]	679	integer nc
	680	parameter (nc=15)
	681	real(wp) s,h,p,en,p1
	682	real(wp) v(nc)
[1125]	683	!!
	684	integer ndc, k
	685	!!----------------------------------------------------------------------
[911]	686
	687	ndc = nc
[1125]	688	! v s are computed here.
	689	v(1) =-3*s +h +p +270 ! Q1
	690	v(2) =-2*s +h +270.0 ! O1
	691	v(3) =-h +270 ! P1
	692	v(4) =180 ! S1
	693	v(5) =h +90.0 ! K1
	694	v(6) =-4s +2h +2*p ! 2N2
	695	v(7) =-4*(s-h) ! MU2
	696	v(8) =-3s +2h +p ! N2
	697	v(9) =-3s +4h -p ! MU2
	698	v(10) =-2s +2h ! M2
	699	v(11) =-s +2*h -p +180 ! L2
	700	v(12) =-h +p1 ! T2
	701	v(13) =0 ! S2
	702	v(14) =h+h ! K2
	703	v(15) =2*v(10) ! M4
[911]	704	!
[1125]	705	!!gm old coding, remove GOTO and label of lines
	706	!!gm obsol( 1): Arithmetic IF statement is used ===> remove this in Fortran 90
[911]	707	do 72 k = 1, ndc
[1125]	708	69 if( v(k) ) 70,71,71
	709	70 v(k) = v(k)+360.0
	710	go to 69
	711	71 if( v(k) - 360.0 ) 72,73,73
	712	73 v(k) = v(k)-360.0
	713	go to 71
[911]	714	72 continue
[1125]	715	!
	716	END SUBROUTINE vset
[911]	717
	718	#else
[1125]	719	!!----------------------------------------------------------------------
	720	!! Dummy module NO Unstruct Open Boundary Conditions for tides
	721	!!----------------------------------------------------------------------
	722	!!gm are you sure we need to define filtide and tide_cpt ?
	723	CHARACTER(len=80), PUBLIC :: filtide !: Filename root for tidal input files
	724	CHARACTER(len=4 ), PUBLIC, DIMENSION(1) :: tide_cpt !: Names of tidal components used.
[911]	725
	726	CONTAINS
[1125]	727	SUBROUTINE tide_init ! Empty routine
[911]	728	END SUBROUTINE tide_init
[1125]	729	SUBROUTINE tide_data ! Empty routine
[911]	730	END SUBROUTINE tide_data
[1125]	731	SUBROUTINE tide_update( kt, kit ) ! Empty routine
	732	WRITE(,) 'tide_update: You should not have seen this print! error?', kt, kit
[911]	733	END SUBROUTINE tide_update
	734	#endif
	735
[1125]	736	!!======================================================================
[911]	737	END MODULE bdytides

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