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source: palm/trunk/SOURCE/virtual_flight_mod.f90 @ 2974

Last change on this file since 2974 was 2932, checked in by maronga, 7 years ago
renamed all Fortran NAMELISTS
Property svn:keywords set to `Id`
File size: 38.9 KB

Rev	Line
[1957]	1	!> @file virtual_flights_mod.f90
[2000]	2	!------------------------------------------------------------------------------!
[2696]	3	! This file is part of the PALM model system.
[1957]	4	!
[2000]	5	! PALM is free software: you can redistribute it and/or modify it under the
	6	! terms of the GNU General Public License as published by the Free Software
	7	! Foundation, either version 3 of the License, or (at your option) any later
	8	! version.
[1957]	9	!
	10	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
	11	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
	12	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
	13	!
	14	! You should have received a copy of the GNU General Public License along with
	15	! PALM. If not, see <http://www.gnu.org/licenses/>.
	16	!
[2718]	17	! Copyright 1997-2018 Leibniz Universitaet Hannover
[2000]	18	!------------------------------------------------------------------------------!
[1957]	19	!
	20	! Current revisions:
	21	! ------------------
	22	!
[2001]	23	!
[1957]	24	! Former revisions:
	25	! -----------------
	26	! $Id: virtual_flight_mod.f90 2932 2018-03-26 09:39:22Z gronemeier $
[2932]	27	! renamed flight_par to virtual_flight_parameters
	28	!
	29	! 2894 2018-03-15 09:17:58Z Giersch
[2894]	30	! variable named found has been introduced for checking if restart data was
	31	! found, reading of restart strings has been moved completely to
	32	! read_restart_data_mod, virtual_flight_prerun flag has been removed, redundant
	33	! skipping function has been removed, flight_read/write_restart_data
	34	! have been renamed to flight_r/wrd_global, flight_rrd_global is called in
	35	! read_restart_data_mod now, marker * end flight * was removed, strings and
	36	! their respective lengths are written out and read now in case of restart runs
	37	! to get rid of prescribed character lengths, CASE DEFAULT was added if restart
	38	! data is read
	39	!
	40	! 2872 2018-03-12 10:05:47Z Giersch
[2776]	41	! virutal_flight_prerun flag is used to define if module
	42	! related parameters were outputted as restart data
	43	!
	44	! 2718 2018-01-02 08:49:38Z maronga
[2716]	45	! Corrected "Former revisions" section
	46	!
	47	! 2696 2017-12-14 17:12:51Z kanani
	48	! Change in file header (GPL part)
	49	!
	50	! 2576 2017-10-24 13:49:46Z Giersch
[2576]	51	! Definition of a new function called flight_skip_var_list to skip module
	52	! parameters during reading restart data
	53	!
	54	! 2563 2017-10-19 15:36:10Z Giersch
[2563]	55	! flight_read_restart_data is called in flight_parin in the case of a restart
	56	! run. flight_skip_var_list is not necessary anymore due to marker changes in
	57	! restart files.
	58	!
	59	! 2271 2017-06-09 12:34:55Z sward
[2271]	60	! Todo added
	61	!
	62	! 2101 2017-01-05 16:42:31Z suehring
[1957]	63	!
[2001]	64	! 2000 2016-08-20 18:09:15Z knoop
	65	! Forced header and separation lines into 80 columns
	66	!
[1961]	67	! 1960 2016-07-12 16:34:24Z suehring
	68	! Separate humidity and passive scalar.
	69	! Bugfix concerning labeling of timeseries.
	70	!
[1958]	71	! 1957 2016-07-07 10:43:48Z suehring
[1957]	72	! Initial revision
	73	!
	74	! Description:
	75	! ------------
	76	!> Module for virtual flight measurements.
[2271]	77	!> @todo Err msg PA0438: flight can be inside topography -> extra check?
[1957]	78	!--------------------------------------------------------------------------------!
	79	MODULE flight_mod
	80
	81	USE control_parameters, &
[2894]	82	ONLY: fl_max, num_leg, num_var_fl, num_var_fl_user, virtual_flight
[1957]	83
	84	USE kinds
	85
	86	CHARACTER(LEN=6), DIMENSION(fl_max) :: leg_mode = 'cyclic' !< flight mode through the model domain, either 'cyclic' or 'return'
	87
	88	INTEGER(iwp) :: l !< index for flight leg
	89	INTEGER(iwp) :: var_index !< index for measured variable
	90
	91	LOGICAL, DIMENSION(:), ALLOCATABLE :: cyclic_leg !< flag to identify fly mode
	92
	93	REAL(wp) :: flight_end = 9999999.9_wp !< end time of virtual flight
	94	REAL(wp) :: flight_begin = 0.0_wp !< end time of virtual flight
	95
	96	REAL(wp), DIMENSION(fl_max) :: flight_angle = 45.0_wp !< angle determining the horizontal flight direction
	97	REAL(wp), DIMENSION(fl_max) :: flight_level = 100.0_wp !< flight level
	98	REAL(wp), DIMENSION(fl_max) :: max_elev_change = 0.0_wp !< maximum elevation change for the respective flight leg
	99	REAL(wp), DIMENSION(fl_max) :: rate_of_climb = 0.0_wp !< rate of climb or descent
	100	REAL(wp), DIMENSION(fl_max) :: speed_agl = 25.0_wp !< absolute horizontal flight speed above ground level (agl)
	101	REAL(wp), DIMENSION(fl_max) :: x_start = 999999999.0_wp !< start x position
	102	REAL(wp), DIMENSION(fl_max) :: x_end = 999999999.0_wp !< end x position
	103	REAL(wp), DIMENSION(fl_max) :: y_start = 999999999.0_wp !< start y position
	104	REAL(wp), DIMENSION(fl_max) :: y_end = 999999999.0_wp !< end y position
	105
	106	REAL(wp), DIMENSION(:), ALLOCATABLE :: u_agl !< u-component of flight speed
	107	REAL(wp), DIMENSION(:), ALLOCATABLE :: v_agl !< v-component of flight speed
	108	REAL(wp), DIMENSION(:), ALLOCATABLE :: w_agl !< w-component of flight speed
	109	REAL(wp), DIMENSION(:), ALLOCATABLE :: x_pos !< aircraft x-position
	110	REAL(wp), DIMENSION(:), ALLOCATABLE :: y_pos !< aircraft y-position
	111	REAL(wp), DIMENSION(:), ALLOCATABLE :: z_pos !< aircraft z-position
	112
	113	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: sensor_l !< measured data on local PE
	114	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: sensor !< measured data
	115
	116	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: var_u !< dummy array for possibly user-defined quantities
	117
	118	SAVE
	119
	120	PRIVATE
	121
	122	INTERFACE flight_header
	123	MODULE PROCEDURE flight_header
	124	END INTERFACE flight_header
	125
	126	INTERFACE flight_init
	127	MODULE PROCEDURE flight_init
	128	END INTERFACE flight_init
	129
	130	INTERFACE flight_init_output
	131	MODULE PROCEDURE flight_init_output
	132	END INTERFACE flight_init_output
	133
	134	INTERFACE flight_check_parameters
	135	MODULE PROCEDURE flight_check_parameters
	136	END INTERFACE flight_check_parameters
	137
	138	INTERFACE flight_parin
	139	MODULE PROCEDURE flight_parin
	140	END INTERFACE flight_parin
	141
	142	INTERFACE interpolate_xyz
	143	MODULE PROCEDURE interpolate_xyz
	144	END INTERFACE interpolate_xyz
	145
	146	INTERFACE flight_measurement
	147	MODULE PROCEDURE flight_measurement
	148	END INTERFACE flight_measurement
	149
[2894]	150	INTERFACE flight_rrd_global
	151	MODULE PROCEDURE flight_rrd_global
	152	END INTERFACE flight_rrd_global
[1957]	153
[2894]	154	INTERFACE flight_wrd_global
	155	MODULE PROCEDURE flight_wrd_global
	156	END INTERFACE flight_wrd_global
[1957]	157
	158	!
	159	!-- Private interfaces
	160	PRIVATE flight_check_parameters, flight_init_output, interpolate_xyz
	161	!
	162	!-- Public interfaces
	163	PUBLIC flight_init, flight_header, flight_parin, flight_measurement, &
[2894]	164	flight_wrd_global, flight_rrd_global
[1957]	165	!
	166	!-- Public variables
	167	PUBLIC fl_max, sensor, x_pos, y_pos, z_pos
	168
	169	CONTAINS
	170
	171	!------------------------------------------------------------------------------!
	172	! Description:
	173	! ------------
	174	!> Header output for flight module.
	175	!------------------------------------------------------------------------------!
	176	SUBROUTINE flight_header ( io )
	177
	178
	179	IMPLICIT NONE
	180
	181	INTEGER(iwp), INTENT(IN) :: io !< Unit of the output file
	182
	183	WRITE ( io, 1 )
	184	WRITE ( io, 2 )
	185	WRITE ( io, 3 ) num_leg
	186	WRITE ( io, 4 ) flight_begin
	187	WRITE ( io, 5 ) flight_end
	188
	189	DO l=1, num_leg
	190	WRITE ( io, 6 ) l
	191	WRITE ( io, 7 ) speed_agl(l)
	192	WRITE ( io, 8 ) flight_level(l)
	193	WRITE ( io, 9 ) max_elev_change(l)
	194	WRITE ( io, 10 ) rate_of_climb(l)
	195	WRITE ( io, 11 ) leg_mode(l)
	196	ENDDO
	197
	198
	199	1 FORMAT (' Virtual flights:'/ &
	200	' ----------------')
	201	2 FORMAT (' Output every timestep')
	202	3 FORMAT (' Number of flight legs:', I3 )
	203	4 FORMAT (' Begin of measurements:', F10.1 , ' s' )
	204	5 FORMAT (' End of measurements:', F10.1 , ' s' )
	205	6 FORMAT (' Leg', I3/, &
	206	' ------' )
	207	7 FORMAT (' Flight speed : ', F5.1, ' m/s' )
	208	8 FORMAT (' Flight level : ', F5.1, ' m' )
	209	9 FORMAT (' Maximum elevation change: ', F5.1, ' m/s' )
	210	10 FORMAT (' Rate of climb / descent : ', F5.1, ' m/s' )
	211	11 FORMAT (' Leg mode : ', A/ )
	212
	213	END SUBROUTINE flight_header
	214
	215	!------------------------------------------------------------------------------!
	216	! Description:
	217	! ------------
	218	!> Reads the namelist flight_par.
	219	!------------------------------------------------------------------------------!
	220	SUBROUTINE flight_parin
	221
[2563]	222	USE control_parameters, &
[2932]	223	ONLY: initializing_actions, message_string
[2563]	224
[1957]	225	IMPLICIT NONE
	226
	227	CHARACTER (LEN=80) :: line !< dummy string that contains the current line of the parameter file
	228
	229	NAMELIST /flight_par/ flight_angle, flight_end, flight_begin, leg_mode,&
	230	flight_level, max_elev_change, rate_of_climb, &
	231	speed_agl, x_end, x_start, y_end, y_start
[2932]	232
	233
	234	NAMELIST /virtual_flight_parameters/ &
	235	flight_angle, flight_end, flight_begin, leg_mode,&
	236	flight_level, max_elev_change, rate_of_climb, &
	237	speed_agl, x_end, x_start, y_end, y_start
[1957]	238	!
	239	!-- Try to find the namelist flight_par
	240	REWIND ( 11 )
	241	line = ' '
[2932]	242	DO WHILE ( INDEX( line, '&virtual_flight_parameters' ) == 0 )
[1957]	243	READ ( 11, '(A)', END=10 ) line
	244	ENDDO
	245	BACKSPACE ( 11 )
	246
	247	!
	248	!-- Read namelist
[2932]	249	READ ( 11, virtual_flight_parameters )
	250	!
	251	!-- Set switch that virtual flights shall be carried out
	252	virtual_flight = .TRUE.
	253
	254	GOTO 12
	255	!
	256	!-- Try to find the old namelist
	257	10 REWIND ( 11 )
	258	line = ' '
	259	DO WHILE ( INDEX( line, '&flight_par' ) == 0 )
	260	READ ( 11, '(A)', END=12 ) line
	261	ENDDO
	262	BACKSPACE ( 11 )
	263
	264	!
	265	!-- Read namelist
[1957]	266	READ ( 11, flight_par )
[2932]	267
	268	message_string = 'namelist flight_par is deprecated and will be ' // &
	269	'removed in near future. Please &use namelist ' // &
	270	'virtual_flight_parameters instead'
	271	CALL message( 'flight_parin', 'PA0487', 0, 1, 0, 6, 0 )
[1957]	272	!
	273	!-- Set switch that virtual flights shall be carried out
	274	virtual_flight = .TRUE.
	275
[2932]	276	12 CONTINUE
[2563]	277
[1957]	278	END SUBROUTINE flight_parin
	279
	280	!------------------------------------------------------------------------------!
	281	! Description:
	282	! ------------
	283	!> Inititalization of required arrays, number of legs and flags. Moreover,
	284	!> initialize flight speed and -direction, as well as start positions.
	285	!------------------------------------------------------------------------------!
	286	SUBROUTINE flight_init
	287
	288	USE constants, &
	289	ONLY: pi
	290
	291	USE control_parameters, &
	292	ONLY: initializing_actions
	293
	294	USE indices, &
	295	ONLY: nxlg, nxrg, nysg, nyng, nzb, nzt
	296
	297	IMPLICIT NONE
	298
	299	REAL(wp) :: distance !< distance between start and end position of a flight leg
	300	!
	301	!-- Determine the number of flight legs
	302	l = 1
	303	DO WHILE ( x_start(l) /= 999999999.0_wp .AND. l <= SIZE(x_start) )
	304	l = l + 1
	305	ENDDO
	306	num_leg = l-1
	307	!
	308	!-- Check for proper parameter settings
	309	CALL flight_check_parameters
	310	!
	311	!-- Allocate and initialize logical array for flight pattern
	312	ALLOCATE( cyclic_leg(1:num_leg) )
	313	!
	314	!-- Initialize flags for cyclic/return legs
	315	DO l = 1, num_leg
	316	cyclic_leg(l) = MERGE( .TRUE., .FALSE., &
	317	TRIM( leg_mode(l) ) == 'cyclic' &
	318	)
	319	ENDDO
	320	!
	321	!-- Allocate and initialize arraxs for flight position and speed. In case of
	322	!-- restart runs these data are read by the routine read_flight_restart_data
	323	!-- instead.
	324	IF ( TRIM( initializing_actions ) /= 'read_restart_data' ) THEN
	325
	326	ALLOCATE( x_pos(1:num_leg), y_pos(1:num_leg ), z_pos(1:num_leg) )
	327	!
	328	!-- Inititalize x-, y-, and z-positions with initial start position
	329	x_pos(1:num_leg) = x_start(1:num_leg)
	330	y_pos(1:num_leg) = y_start(1:num_leg)
	331	z_pos(1:num_leg) = flight_level(1:num_leg)
	332	!
	333	!-- Allocate arrays for flight-speed components
	334	ALLOCATE( u_agl(1:num_leg), &
	335	v_agl(1:num_leg), &
	336	w_agl(1:num_leg) )
	337	!
	338	!-- Inititalize u-, v- and w-component.
	339	DO l = 1, num_leg
	340	!
	341	!-- In case of return-legs, the flight direction, i.e. the horizontal
	342	!-- flight-speed components, are derived from the given start/end
	343	!-- positions.
	344	IF ( .NOT. cyclic_leg(l) ) THEN
	345	distance = SQRT( ( x_end(l) - x_start(l) )**2 &
	346	+ ( y_end(l) - y_start(l) )**2 )
	347	u_agl(l) = speed_agl(l) * ( x_end(l) - x_start(l) ) / distance
	348	v_agl(l) = speed_agl(l) * ( y_end(l) - y_start(l) ) / distance
	349	w_agl(l) = rate_of_climb(l)
	350	!
	351	!-- In case of cyclic-legs, flight direction is directly derived from
	352	!-- the given flight angle.
	353	ELSE
	354	u_agl(l) = speed_agl(l) * COS( flight_angle(l) * pi / 180.0_wp )
	355	v_agl(l) = speed_agl(l) * SIN( flight_angle(l) * pi / 180.0_wp )
	356	w_agl(l) = rate_of_climb(l)
	357	ENDIF
	358
	359	ENDDO
	360
	361	ENDIF
	362	!
	363	!-- Initialized data output
	364	CALL flight_init_output
	365	!
	366	!-- Allocate array required for user-defined quantities if necessary.
	367	IF ( num_var_fl_user > 0 ) &
	368	ALLOCATE( var_u(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
	369	!
	370	!-- Allocate and initialize arrays containing the measured data
	371	ALLOCATE( sensor_l(1:num_var_fl,1:num_leg) )
	372	ALLOCATE( sensor(1:num_var_fl,1:num_leg) )
	373	sensor_l = 0.0_wp
	374	sensor = 0.0_wp
	375
	376	END SUBROUTINE flight_init
	377
	378
	379	!------------------------------------------------------------------------------!
	380	! Description:
	381	! ------------
	382	!> Initialization of output-variable names and units.
	383	!------------------------------------------------------------------------------!
	384	SUBROUTINE flight_init_output
	385
	386	USE control_parameters, &
	387	ONLY: cloud_droplets, cloud_physics, humidity, neutral, &
	388	passive_scalar
	389
	390	USE netcdf_interface
	391
	392	IMPLICIT NONE
	393
	394	CHARACTER(LEN=10) :: label_leg !< dummy argument to convert integer to string
	395
	396	INTEGER(iwp) :: i !< loop variable
[1960]	397	INTEGER(iwp) :: id_pt !< identifyer for labeling
	398	INTEGER(iwp) :: id_q !< identifyer for labeling
	399	INTEGER(iwp) :: id_ql !< identifyer for labeling
	400	INTEGER(iwp) :: id_s !< identifyer for labeling
	401	INTEGER(iwp) :: id_u = 1 !< identifyer for labeling
	402	INTEGER(iwp) :: id_v = 2 !< identifyer for labeling
	403	INTEGER(iwp) :: id_w = 3 !< identifyer for labeling
[1957]	404	INTEGER(iwp) :: k !< index variable
	405
	406	LOGICAL :: init = .TRUE. !< flag to distiquish calls of user_init_flight
	407	!
	408	!-- Define output quanities, at least three variables are measured (u,v,w)
	409	num_var_fl = 3
[1960]	410	IF ( .NOT. neutral ) THEN
	411	num_var_fl = num_var_fl + 1
	412	id_pt = num_var_fl
	413	ENDIF
	414	IF ( humidity ) THEN
	415	num_var_fl = num_var_fl + 1
	416	id_q = num_var_fl
	417	ENDIF
	418	IF ( cloud_physics .OR. cloud_droplets ) THEN
	419	num_var_fl = num_var_fl + 1
	420	id_ql = num_var_fl
	421	ENDIF
	422	IF ( passive_scalar ) THEN
	423	num_var_fl = num_var_fl + 1
	424	id_s = num_var_fl
	425	ENDIF
[1957]	426	!
	427	!-- Write output strings for dimensions x, y, z
	428	DO l=1, num_leg
	429
	430	IF ( l < 10 ) WRITE( label_leg, '(I1)') l
	431	IF ( l >= 10 .AND. l < 100 ) WRITE( label_leg, '(I2)') l
	432	IF ( l >= 100 .AND. l < 1000 ) WRITE( label_leg, '(I3)') l
	433
	434	dofl_dim_label_x(l) = 'x_' // TRIM( label_leg )
	435	dofl_dim_label_y(l) = 'y_' // TRIM( label_leg )
	436	dofl_dim_label_z(l) = 'z_' // TRIM( label_leg )
	437
	438	ENDDO
	439
	440	!
	441	!-- Call user routine to initialize further variables
	442	CALL user_init_flight( init )
	443	!
	444	!-- Write output labels and units for the quanities
	445	k = 1
	446	DO l=1, num_leg
	447
	448	IF ( l < 10 ) WRITE( label_leg, '(I1)') l
	449	IF ( l >= 10 .AND. l < 100 ) WRITE( label_leg, '(I2)') l
	450	IF ( l >= 100 .AND. l < 1000 ) WRITE( label_leg, '(I3)') l
	451
	452	label_leg = 'leg_' // TRIM(label_leg)
	453	DO i=1, num_var_fl
	454
[1960]	455	IF ( i == id_u ) THEN
	456	dofl_label(k) = TRIM( label_leg ) // '_u'
	457	dofl_unit(k) = 'm/s'
	458	k = k + 1
	459	ELSEIF ( i == id_v ) THEN
	460	dofl_label(k) = TRIM( label_leg ) // '_v'
	461	dofl_unit(k) = 'm/s'
	462	k = k + 1
	463	ELSEIF ( i == id_w ) THEN
	464	dofl_label(k) = TRIM( label_leg ) // '_w'
	465	dofl_unit(k) = 'm/s'
	466	k = k + 1
	467	ELSEIF ( i == id_pt ) THEN
	468	dofl_label(k) = TRIM( label_leg ) // '_pt'
	469	dofl_unit(k) = 'K'
	470	k = k + 1
	471	ELSEIF ( i == id_q ) THEN
	472	dofl_label(k) = TRIM( label_leg ) // '_q'
	473	dofl_unit(k) = 'kg/kg'
	474	k = k + 1
	475	ELSEIF ( i == id_ql ) THEN
	476	dofl_label(k) = TRIM( label_leg ) // '_ql'
	477	dofl_unit(k) = 'kg/kg'
	478	k = k + 1
	479	ELSEIF ( i == id_s ) THEN
	480	dofl_label(k) = TRIM( label_leg ) // '_s'
	481	dofl_unit(k) = 'kg/kg'
	482	k = k + 1
	483	ENDIF
[1957]	484	ENDDO
	485
	486	DO i=1, num_var_fl_user
	487	CALL user_init_flight( init, k, i, label_leg )
	488	ENDDO
	489
	490	ENDDO
	491	!
	492	!-- Finally, set the total number of flight-output quantities.
	493	num_var_fl = num_var_fl + num_var_fl_user
	494
	495	END SUBROUTINE flight_init_output
	496
	497	!------------------------------------------------------------------------------!
	498	! Description:
	499	! ------------
	500	!> This routine calculates the current flight positions and calls the
	501	!> respective interpolation routine to measures the data at the current
	502	!> flight position.
	503	!------------------------------------------------------------------------------!
	504	SUBROUTINE flight_measurement
	505
	506	USE arrays_3d, &
[1960]	507	ONLY: ddzu, ddzw, pt, q, ql, s, u, v, w, zu, zw
[1957]	508
	509	USE control_parameters, &
	510	ONLY: cloud_droplets, cloud_physics, dz, dz_stretch_level, dt_3d, &
	511	humidity, neutral, passive_scalar, simulated_time
	512
	513	USE cpulog, &
	514	ONLY: cpu_log, log_point
	515
	516	USE grid_variables, &
	517	ONLY: ddx, ddy, dx, dy
	518
	519	USE indices, &
	520	ONLY: nx, nxl, nxlg, nxr, nxrg, ny, nys, nysg, nyn, nyng, nzb, nzt
	521
	522	USE pegrid
	523
	524	IMPLICIT NONE
	525
	526	LOGICAL :: on_pe !< flag to check if current flight position is on current PE
	527
	528	REAL(wp) :: x !< distance between left edge of current grid box and flight position
	529	REAL(wp) :: y !< distance between south edge of current grid box and flight position
	530
	531	INTEGER(iwp) :: i !< index of current grid box along x
	532	INTEGER(iwp) :: j !< index of current grid box along y
	533	INTEGER(iwp) :: n !< loop variable for number of user-defined output quantities
	534
	535	CALL cpu_log( log_point(65), 'flight_measurement', 'start' )
	536	!
	537	!-- Perform flight measurement if start time is reached.
	538	IF ( simulated_time >= flight_begin .AND. &
	539	simulated_time <= flight_end ) THEN
	540
	541	sensor_l = 0.0_wp
	542	sensor = 0.0_wp
	543	!
	544	!-- Loop over all flight legs
	545	DO l=1, num_leg
	546	!
	547	!-- Update location for each leg
	548	x_pos(l) = x_pos(l) + u_agl(l) * dt_3d
	549	y_pos(l) = y_pos(l) + v_agl(l) * dt_3d
	550	z_pos(l) = z_pos(l) + w_agl(l) * dt_3d
	551	!
	552	!-- Check if location must be modified for return legs.
	553	!-- Carry out horizontal reflection if required.
	554	IF ( .NOT. cyclic_leg(l) ) THEN
	555	!
	556	!-- Outward flight, i.e. from start to end
	557	IF ( u_agl(l) >= 0.0_wp .AND. x_pos(l) > x_end(l) ) THEN
	558	x_pos(l) = 2.0_wp * x_end(l) - x_pos(l)
	559	u_agl(l) = - u_agl(l)
	560	!
	561	!-- Return flight, i.e. from end to start
	562	ELSEIF ( u_agl(l) < 0.0_wp .AND. x_pos(l) < x_start(l) ) THEN
	563	x_pos(l) = 2.0_wp * x_start(l) - x_pos(l)
	564	u_agl(l) = - u_agl(l)
	565	ENDIF
	566	!
	567	!-- Outward flight, i.e. from start to end
	568	IF ( v_agl(l) >= 0.0_wp .AND. y_pos(l) > y_end(l) ) THEN
	569	y_pos(l) = 2.0_wp * y_end(l) - y_pos(l)
	570	v_agl(l) = - v_agl(l)
	571	!
	572	!-- Return flight, i.e. from end to start
	573	ELSEIF ( v_agl(l) < 0.0_wp .AND. y_pos(l) < y_start(l) ) THEN
	574	y_pos(l) = 2.0_wp * y_start(l) - y_pos(l)
	575	v_agl(l) = - v_agl(l)
	576	ENDIF
	577	!
	578	!-- Check if flight position is out of the model domain and apply
	579	!-- cyclic conditions if required
	580	ELSEIF ( cyclic_leg(l) ) THEN
	581	!
	582	!-- Check if aircraft leaves the model domain at the right boundary
	583	IF ( ( flight_angle(l) >= 0.0_wp .AND. &
	584	flight_angle(l) <= 90.0_wp ) .OR. &
	585	( flight_angle(l) >= 270.0_wp .AND. &
	586	flight_angle(l) <= 360.0_wp ) ) THEN
	587	IF ( x_pos(l) >= ( nx + 0.5_wp ) * dx ) &
	588	x_pos(l) = x_pos(l) - ( nx + 1 ) * dx
	589	!
	590	!-- Check if aircraft leaves the model domain at the left boundary
	591	ELSEIF ( flight_angle(l) > 90.0_wp .AND. &
	592	flight_angle(l) < 270.0_wp ) THEN
	593	IF ( x_pos(l) < -0.5_wp * dx ) &
	594	x_pos(l) = ( nx + 1 ) * dx + x_pos(l)
	595	ENDIF
	596	!
	597	!-- Check if aircraft leaves the model domain at the north boundary
	598	IF ( flight_angle(l) >= 0.0_wp .AND. &
	599	flight_angle(l) <= 180.0_wp ) THEN
	600	IF ( y_pos(l) >= ( ny + 0.5_wp ) * dy ) &
	601	y_pos(l) = y_pos(l) - ( ny + 1 ) * dy
	602	!
	603	!-- Check if aircraft leaves the model domain at the south boundary
	604	ELSEIF ( flight_angle(l) > 180.0_wp .AND. &
	605	flight_angle(l) < 360.0_wp ) THEN
	606	IF ( y_pos(l) < -0.5_wp * dy ) &
	607	y_pos(l) = ( ny + 1 ) * dy + y_pos(l)
	608	ENDIF
	609
	610	ENDIF
	611	!
	612	!-- Check if maximum elevation change is already reached. If required
	613	!-- reflect vertically.
	614	IF ( rate_of_climb(l) /= 0.0_wp ) THEN
	615	!
	616	!-- First check if aircraft is too high
	617	IF ( w_agl(l) > 0.0_wp .AND. &
	618	z_pos(l) - flight_level(l) > max_elev_change(l) ) THEN
	619	z_pos(l) = 2.0_wp * ( flight_level(l) + max_elev_change(l) )&
	620	- z_pos(l)
	621	w_agl(l) = - w_agl(l)
	622	!
	623	!-- Check if aircraft is too low
	624	ELSEIF ( w_agl(l) < 0.0_wp .AND. z_pos(l) < flight_level(l) ) THEN
	625	z_pos(l) = 2.0_wp * flight_level(l) - z_pos(l)
	626	w_agl(l) = - w_agl(l)
	627	ENDIF
	628
	629	ENDIF
	630	!
	631	!-- Determine grid indices for flight position along x- and y-direction.
	632	!-- Please note, there is a special treatment for the index
	633	!-- along z-direction, which is due to vertical grid stretching.
	634	i = ( x_pos(l) + 0.5_wp * dx ) * ddx
	635	j = ( y_pos(l) + 0.5_wp * dy ) * ddy
	636	!
	637	!-- Check if indices are on current PE
	638	on_pe = ( i >= nxl .AND. i <= nxr .AND. &
	639	j >= nys .AND. j <= nyn )
	640
	641	IF ( on_pe ) THEN
	642
	643	var_index = 1
	644	!
	645	!-- Recalculate indices, as u is shifted by -0.5*dx.
	646	i = x_pos(l) * ddx
	647	j = ( y_pos(l) + 0.5_wp * dy ) * ddy
	648	!
	649	!-- Calculate distance from left and south grid-box edges.
	650	x = x_pos(l) - ( 0.5_wp - i ) * dx
	651	y = y_pos(l) - j * dy
	652	!
	653	!-- Interpolate u-component onto current flight position.
	654	CALL interpolate_xyz( u, zu, ddzu, 1.0_wp, x, y, var_index, j, i )
	655	var_index = var_index + 1
	656	!
	657	!-- Recalculate indices, as v is shifted by -0.5*dy.
	658	i = ( x_pos(l) + 0.5_wp * dx ) * ddx
	659	j = y_pos(l) * ddy
	660
	661	x = x_pos(l) - i * dx
	662	y = y_pos(l) - ( 0.5_wp - j ) * dy
	663	CALL interpolate_xyz( v, zu, ddzu, 1.0_wp, x, y, var_index, j, i )
	664	var_index = var_index + 1
	665	!
	666	!-- Interpolate w and scalar quantities. Recalculate indices.
	667	i = ( x_pos(l) + 0.5_wp * dx ) * ddx
	668	j = ( y_pos(l) + 0.5_wp * dy ) * ddy
	669	x = x_pos(l) - i * dx
	670	y = y_pos(l) - j * dy
	671	!
	672	!-- Interpolate w-velocity component.
	673	CALL interpolate_xyz( w, zw, ddzw, 0.0_wp, x, y, var_index, j, i )
	674	var_index = var_index + 1
	675	!
	676	!-- Potential temerature
	677	IF ( .NOT. neutral ) THEN
	678	CALL interpolate_xyz( pt, zu, ddzu, 1.0_wp, x, y, var_index, j, i )
	679	var_index = var_index + 1
	680	ENDIF
	681	!
[1960]	682	!-- Humidity
	683	IF ( humidity ) THEN
[1957]	684	CALL interpolate_xyz( q, zu, ddzu, 1.0_wp, x, y, var_index, j, i )
	685	var_index = var_index + 1
	686	ENDIF
	687	!
	688	!-- Liquid water content
	689	IF ( cloud_physics .OR. cloud_droplets ) THEN
	690	CALL interpolate_xyz( ql, zu, ddzu, 1.0_wp, x, y, var_index, j, i )
	691	var_index = var_index + 1
	692	ENDIF
	693	!
[1960]	694	!-- Passive scalar
	695	IF ( passive_scalar ) THEN
	696	CALL interpolate_xyz( s, zu, ddzu, 1.0_wp, x, y, var_index, j, i )
	697	var_index = var_index + 1
	698	ENDIF
	699	!
[1957]	700	!-- Treat user-defined variables if required
	701	DO n = 1, num_var_fl_user
	702	CALL user_flight( var_u, n )
	703	CALL interpolate_xyz( var_u, zu, ddzu, 1.0_wp, x, y, var_index, j, i )
	704	var_index = var_index + 1
	705	ENDDO
	706	ENDIF
	707
	708	ENDDO
	709	!
	710	!-- Write local data on global array.
	711	#if defined( __parallel )
	712	CALL MPI_ALLREDUCE(sensor_l(1,1), sensor(1,1), &
	713	num_var_fl*num_leg, MPI_REAL, MPI_SUM, &
	714	comm2d, ierr )
	715	#else
	716	sensor = sensor_l
	717	#endif
	718	ENDIF
	719
	720	CALL cpu_log( log_point(65), 'flight_measurement', 'stop' )
	721
	722	END SUBROUTINE flight_measurement
	723
	724	!------------------------------------------------------------------------------!
	725	! Description:
	726	! ------------
	727	!> This subroutine bi-linearly interpolates the respective data onto the current
	728	!> flight position.
	729	!------------------------------------------------------------------------------!
	730	SUBROUTINE interpolate_xyz( var, z_uw, ddz_uw, fac, x, y, var_ind, j, i )
	731
	732	USE control_parameters, &
	733	ONLY: dz, dz_stretch_level
	734
	735	USE grid_variables, &
	736	ONLY: dx, dy
	737
	738	USE indices, &
	739	ONLY: nzb, nzt, nxlg, nxrg, nysg, nyng
	740
	741	IMPLICIT NONE
	742
	743	INTEGER(iwp) :: i !< index along x
	744	INTEGER(iwp) :: j !< index along y
	745	INTEGER(iwp) :: k !< index along z
	746	INTEGER(iwp) :: k1 !< dummy variable
	747	INTEGER(iwp) :: var_ind !< index variable for output quantity
	748
	749	REAL(wp) :: aa !< dummy argument for horizontal interpolation
	750	REAL(wp) :: bb !< dummy argument for horizontal interpolation
	751	REAL(wp) :: cc !< dummy argument for horizontal interpolation
	752	REAL(wp) :: dd !< dummy argument for horizontal interpolation
	753	REAL(wp) :: gg !< dummy argument for horizontal interpolation
	754	REAL(wp) :: fac !< flag to indentify if quantity is on zu or zw level
	755	REAL(wp) :: var_int !< horizontal interpolated variable at current position
	756	REAL(wp) :: var_int_l !< horizontal interpolated variable at k-level
	757	REAL(wp) :: var_int_u !< horizontal interpolated variable at (k+1)-level
	758	REAL(wp) :: x !< distance between left edge of current grid box and flight position
	759	REAL(wp) :: y !< distance between south edge of current grid box and flight position
	760
	761	REAL(wp), DIMENSION(1:nzt+1) :: ddz_uw !< inverse vertical grid spacing
	762	REAL(wp), DIMENSION(nzb:nzt+1) :: z_uw !< height level
	763
	764	REAL(wp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: var !< treted quantity
	765	!
	766	!-- Calculate interpolation coefficients
	767	aa = x2 + y2
	768	bb = ( dx - x )2 + y2
	769	cc = x2 + ( dy - y )2
	770	dd = ( dx - x )2 + ( dy - y )2
	771	gg = aa + bb + cc + dd
	772	!
	773	!-- Obtain vertical index. Special treatment for grid index along z-direction
	774	!-- if flight position is above the vertical grid-stretching level.
	775	!-- fac=1 if variable is on scalar grid level, fac=0 for w-component.
	776	IF ( z_pos(l) < dz_stretch_level ) THEN
	777	k = ( z_pos(l) + fac * 0.5_wp * dz ) / dz
	778	ELSE
	779	!
	780	!-- Search for k-index
	781	DO k1=nzb, nzt
	782	IF ( z_pos(l) >= z_uw(k1) .AND. z_pos(l) < z_uw(k1+1) ) THEN
	783	k = k1
	784	EXIT
	785	ENDIF
	786	ENDDO
	787	ENDIF
	788	!
	789	!-- (x,y)-interpolation at k-level
	790	var_int_l = ( ( gg - aa ) * var(k,j,i) + &
	791	( gg - bb ) * var(k,j,i+1) + &
	792	( gg - cc ) * var(k,j+1,i) + &
	793	( gg - dd ) * var(k,j+1,i+1) &
	794	) / ( 3.0_wp * gg )
	795	!
	796	!-- (x,y)-interpolation on (k+1)-level
	797	var_int_u = ( ( gg - aa ) * var(k+1,j,i) + &
	798	( gg - bb ) * var(k+1,j,i+1) + &
	799	( gg - cc ) * var(k+1,j+1,i) + &
	800	( gg - dd ) * var(k+1,j+1,i+1) &
	801	) / ( 3.0_wp * gg )
	802	!
	803	!-- z-interpolation onto current flight postion
	804	var_int = var_int_l &
	805	+ ( z_pos(l) - z_uw(k) ) * ddz_uw(k+1) &
	806	* (var_int_u - var_int_l )
	807	!
	808	!-- Store on local data array
	809	sensor_l(var_ind,l) = var_int
	810
	811	END SUBROUTINE interpolate_xyz
	812
	813	!------------------------------------------------------------------------------!
	814	! Description:
	815	! ------------
	816	!> Perform parameter checks.
	817	!------------------------------------------------------------------------------!
	818	SUBROUTINE flight_check_parameters
	819
	820	USE arrays_3d, &
	821	ONLY: zu
	822
	823	USE control_parameters, &
	824	ONLY: bc_lr_cyc, bc_ns_cyc, dz, message_string
	825
	826	USE grid_variables, &
	827	ONLY: dx, dy
	828
	829	USE indices, &
	830	ONLY: nx, ny, nz
	831
	832	USE netcdf_interface, &
	833	ONLY: netcdf_data_format
	834
	835	IMPLICIT NONE
	836
	837	!
	838	!-- Check if start positions are properly set.
	839	DO l=1, num_leg
	840	IF ( x_start(l) < 0.0_wp .OR. x_start(l) > ( nx + 1 ) * dx ) THEN
	841	message_string = 'Start x position is outside the model domain'
	842	CALL message( 'flight_check_parameters', 'PA0431', 1, 2, 0, 6, 0 )
	843	ENDIF
	844	IF ( y_start(l) < 0.0_wp .OR. y_start(l) > ( ny + 1 ) * dy ) THEN
	845	message_string = 'Start y position is outside the model domain'
	846	CALL message( 'flight_check_parameters', 'PA0432', 1, 2, 0, 6, 0 )
	847	ENDIF
	848
	849	ENDDO
	850	!
	851	!-- Check for leg mode
	852	DO l=1, num_leg
	853	!
	854	!-- Check if leg mode matches the overall lateral model boundary
	855	!-- conditions.
	856	IF ( TRIM( leg_mode(l) ) == 'cyclic' ) THEN
	857	IF ( .NOT. bc_lr_cyc .OR. .NOT. bc_ns_cyc ) THEN
	858	message_string = 'Cyclic flight leg does not match ' // &
	859	'lateral boundary condition'
	860	CALL message( 'flight_check_parameters', 'PA0433', 1, 2, 0, 6, 0 )
	861	ENDIF
	862	!
	863	!-- Check if end-positions are inside the model domain in case of
	864	!.. return-legs.
	865	ELSEIF ( TRIM( leg_mode(l) ) == 'return' ) THEN
	866	IF ( x_end(l) > ( nx + 1 ) * dx .OR. &
	867	y_end(l) > ( ny + 1 ) * dx ) THEN
	868	message_string = 'Flight leg or parts of it are outside ' // &
	869	'the model domain'
	870	CALL message( 'flight_check_parameters', 'PA0434', 1, 2, 0, 6, 0 )
	871	ENDIF
	872	ELSE
	873	message_string = 'Unknown flight mode'
	874	CALL message( 'flight_check_parameters', 'PA0435', 1, 2, 0, 6, 0 )
	875	ENDIF
	876
	877	ENDDO
	878	!
	879	!-- Check if start and end positions are properly set in case of return legs.
	880	DO l=1, num_leg
	881
	882	IF ( x_start(l) > x_end(l) .AND. leg_mode(l) == 'return' ) THEN
	883	message_string = 'x_start position must be <= x_end ' // &
	884	'position for return legs'
	885	CALL message( 'flight_check_parameters', 'PA0436', 1, 2, 0, 6, 0 )
	886	ENDIF
	887	IF ( y_start(l) > y_end(l) .AND. leg_mode(l) == 'return' ) THEN
	888	message_string = 'y_start position must be <= y_end ' // &
	889	'position for return legs'
	890	CALL message( 'flight_check_parameters', 'PA0437', 1, 2, 0, 6, 0 )
	891	ENDIF
	892	ENDDO
	893	!
	894	!-- Check if given flight object remains inside model domain if a rate of
	895	!-- climb / descent is prescribed.
	896	DO l=1, num_leg
	897	IF ( flight_level(l) + max_elev_change(l) > zu(nz) .OR. &
	898	flight_level(l) + max_elev_change(l) <= 0.0_wp ) THEN
	899	message_string = 'Flight level is outside the model domain '
	900	CALL message( 'flight_check_parameters', 'PA0438', 1, 2, 0, 6, 0 )
	901	ENDIF
	902	ENDDO
	903	!
	904	!-- Check for appropriate NetCDF format. Definition of more than one
	905	!-- unlimited dimension is unfortunately only possible with NetCDF4/HDF5.
	906	IF ( netcdf_data_format <= 2 ) THEN
	907	message_string = 'netcdf_data_format must be > 2'
	908	CALL message( 'flight_check_parameters', 'PA0439', 1, 2, 0, 6, 0 )
	909	ENDIF
	910
	911
	912	END SUBROUTINE flight_check_parameters
[2894]	913
[2576]	914
	915	!------------------------------------------------------------------------------!
	916	! Description:
	917	! ------------
[2894]	918	!> This routine reads the respective restart data.
[2576]	919	!------------------------------------------------------------------------------!
[2894]	920	SUBROUTINE flight_rrd_global( found )
[2576]	921
	922
[2894]	923	USE control_parameters, &
	924	ONLY: length, restart_string
[2576]	925
[1957]	926
	927	IMPLICIT NONE
	928
[2894]	929	LOGICAL, INTENT(OUT) :: found
[1957]	930
[2894]	931
	932	found = .TRUE.
	933
	934
	935	SELECT CASE ( restart_string(1:length) )
[1957]	936
[2894]	937	CASE ( 'u_agl' )
	938	IF ( .NOT. ALLOCATED( u_agl ) ) ALLOCATE( u_agl(1:num_leg) )
	939	READ ( 13 ) u_agl
	940	CASE ( 'v_agl' )
	941	IF ( .NOT. ALLOCATED( v_agl ) ) ALLOCATE( v_agl(1:num_leg) )
	942	READ ( 13 ) v_agl
	943	CASE ( 'w_agl' )
	944	IF ( .NOT. ALLOCATED( w_agl ) ) ALLOCATE( w_agl(1:num_leg) )
	945	READ ( 13 ) w_agl
	946	CASE ( 'x_pos' )
	947	IF ( .NOT. ALLOCATED( x_pos ) ) ALLOCATE( x_pos(1:num_leg) )
	948	READ ( 13 ) x_pos
	949	CASE ( 'y_pos' )
	950	IF ( .NOT. ALLOCATED( y_pos ) ) ALLOCATE( y_pos(1:num_leg) )
	951	READ ( 13 ) y_pos
	952	CASE ( 'z_pos' )
	953	IF ( .NOT. ALLOCATED( z_pos ) ) ALLOCATE( z_pos(1:num_leg) )
	954	READ ( 13 ) z_pos
	955
	956	CASE DEFAULT
	957
	958	found = .FALSE.
[1957]	959
[2894]	960	END SELECT
[1957]	961
[2894]	962
	963	END SUBROUTINE flight_rrd_global
[1957]	964
	965	!------------------------------------------------------------------------------!
	966	! Description:
	967	! ------------
	968	!> This routine writes the respective restart data.
	969	!------------------------------------------------------------------------------!
[2894]	970	SUBROUTINE flight_wrd_global
[1957]	971
[2894]	972
[1957]	973	IMPLICIT NONE
[2776]	974
[2894]	975
	976	CALL wrd_write_string( 'u_agl' )
	977	WRITE ( 14 ) u_agl
	978
	979	CALL wrd_write_string( 'v_agl' )
[1957]	980	WRITE ( 14 ) v_agl
[2894]	981
	982	CALL wrd_write_string( 'w_agl' )
[1957]	983	WRITE ( 14 ) w_agl
[2894]	984
	985	CALL wrd_write_string( 'x_pos' )
[1957]	986	WRITE ( 14 ) x_pos
[2894]	987
	988	CALL wrd_write_string( 'y_pos' )
[1957]	989	WRITE ( 14 ) y_pos
[2894]	990
	991	CALL wrd_write_string( 'z_pos' )
[1957]	992	WRITE ( 14 ) z_pos
[2894]	993
[1957]	994
[2894]	995	END SUBROUTINE flight_wrd_global
[1957]	996
	997
	998	END MODULE flight_mod

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