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source: palm/trunk/SOURCE/virtual_flight_mod.f90 @ 2128

Last change on this file since 2128 was 2101, checked in by suehring, 8 years ago
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[1957]	1	!> @file virtual_flights_mod.f90
[2000]	2	!------------------------------------------------------------------------------!
[1957]	3	! This file is part of PALM.
	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	!
[2101]	17	! Copyright 1997-2017 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 2101 2017-01-05 16:42:31Z suehring $
	27	!
[2001]	28	! 2000 2016-08-20 18:09:15Z knoop
	29	! Forced header and separation lines into 80 columns
	30	!
[1961]	31	! 1960 2016-07-12 16:34:24Z suehring
	32	! Separate humidity and passive scalar.
	33	! Bugfix concerning labeling of timeseries.
	34	!
[1958]	35	! 1957 2016-07-07 10:43:48Z suehring
[1957]	36	! Initial revision
	37	!
	38	! Description:
	39	! ------------
	40	!> Module for virtual flight measurements.
	41	!--------------------------------------------------------------------------------!
	42	MODULE flight_mod
	43
	44	USE control_parameters, &
	45	ONLY: fl_max, num_leg, num_var_fl, num_var_fl_user, virtual_flight
	46
	47	USE kinds
	48
	49	CHARACTER(LEN=6), DIMENSION(fl_max) :: leg_mode = 'cyclic' !< flight mode through the model domain, either 'cyclic' or 'return'
	50
	51	INTEGER(iwp) :: l !< index for flight leg
	52	INTEGER(iwp) :: var_index !< index for measured variable
	53
	54	LOGICAL, DIMENSION(:), ALLOCATABLE :: cyclic_leg !< flag to identify fly mode
	55
	56	REAL(wp) :: flight_end = 9999999.9_wp !< end time of virtual flight
	57	REAL(wp) :: flight_begin = 0.0_wp !< end time of virtual flight
	58
	59	REAL(wp), DIMENSION(fl_max) :: flight_angle = 45.0_wp !< angle determining the horizontal flight direction
	60	REAL(wp), DIMENSION(fl_max) :: flight_level = 100.0_wp !< flight level
	61	REAL(wp), DIMENSION(fl_max) :: max_elev_change = 0.0_wp !< maximum elevation change for the respective flight leg
	62	REAL(wp), DIMENSION(fl_max) :: rate_of_climb = 0.0_wp !< rate of climb or descent
	63	REAL(wp), DIMENSION(fl_max) :: speed_agl = 25.0_wp !< absolute horizontal flight speed above ground level (agl)
	64	REAL(wp), DIMENSION(fl_max) :: x_start = 999999999.0_wp !< start x position
	65	REAL(wp), DIMENSION(fl_max) :: x_end = 999999999.0_wp !< end x position
	66	REAL(wp), DIMENSION(fl_max) :: y_start = 999999999.0_wp !< start y position
	67	REAL(wp), DIMENSION(fl_max) :: y_end = 999999999.0_wp !< end y position
	68
	69	REAL(wp), DIMENSION(:), ALLOCATABLE :: u_agl !< u-component of flight speed
	70	REAL(wp), DIMENSION(:), ALLOCATABLE :: v_agl !< v-component of flight speed
	71	REAL(wp), DIMENSION(:), ALLOCATABLE :: w_agl !< w-component of flight speed
	72	REAL(wp), DIMENSION(:), ALLOCATABLE :: x_pos !< aircraft x-position
	73	REAL(wp), DIMENSION(:), ALLOCATABLE :: y_pos !< aircraft y-position
	74	REAL(wp), DIMENSION(:), ALLOCATABLE :: z_pos !< aircraft z-position
	75
	76	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: sensor_l !< measured data on local PE
	77	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: sensor !< measured data
	78
	79	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: var_u !< dummy array for possibly user-defined quantities
	80
	81	SAVE
	82
	83	PRIVATE
	84
	85	INTERFACE flight_header
	86	MODULE PROCEDURE flight_header
	87	END INTERFACE flight_header
	88
	89	INTERFACE flight_init
	90	MODULE PROCEDURE flight_init
	91	END INTERFACE flight_init
	92
	93	INTERFACE flight_init_output
	94	MODULE PROCEDURE flight_init_output
	95	END INTERFACE flight_init_output
	96
	97	INTERFACE flight_check_parameters
	98	MODULE PROCEDURE flight_check_parameters
	99	END INTERFACE flight_check_parameters
	100
	101	INTERFACE flight_parin
	102	MODULE PROCEDURE flight_parin
	103	END INTERFACE flight_parin
	104
	105	INTERFACE interpolate_xyz
	106	MODULE PROCEDURE interpolate_xyz
	107	END INTERFACE interpolate_xyz
	108
	109	INTERFACE flight_measurement
	110	MODULE PROCEDURE flight_measurement
	111	END INTERFACE flight_measurement
	112
	113	INTERFACE flight_skip_var_list
	114	MODULE PROCEDURE flight_skip_var_list
	115	END INTERFACE flight_skip_var_list
	116
	117	INTERFACE flight_read_restart_data
	118	MODULE PROCEDURE flight_read_restart_data
	119	END INTERFACE flight_read_restart_data
	120
	121	INTERFACE flight_write_restart_data
	122	MODULE PROCEDURE flight_write_restart_data
	123	END INTERFACE flight_write_restart_data
	124
	125	!
	126	!-- Private interfaces
	127	PRIVATE flight_check_parameters, flight_init_output, interpolate_xyz
	128	!
	129	!-- Public interfaces
	130	PUBLIC flight_init, flight_header, flight_parin, flight_measurement, &
	131	flight_skip_var_list, flight_read_restart_data, &
	132	flight_write_restart_data
	133	!
	134	!-- Public variables
	135	PUBLIC fl_max, sensor, x_pos, y_pos, z_pos
	136
	137	CONTAINS
	138
	139	!------------------------------------------------------------------------------!
	140	! Description:
	141	! ------------
	142	!> Header output for flight module.
	143	!------------------------------------------------------------------------------!
	144	SUBROUTINE flight_header ( io )
	145
	146
	147	IMPLICIT NONE
	148
	149	INTEGER(iwp), INTENT(IN) :: io !< Unit of the output file
	150
	151	WRITE ( io, 1 )
	152	WRITE ( io, 2 )
	153	WRITE ( io, 3 ) num_leg
	154	WRITE ( io, 4 ) flight_begin
	155	WRITE ( io, 5 ) flight_end
	156
	157	DO l=1, num_leg
	158	WRITE ( io, 6 ) l
	159	WRITE ( io, 7 ) speed_agl(l)
	160	WRITE ( io, 8 ) flight_level(l)
	161	WRITE ( io, 9 ) max_elev_change(l)
	162	WRITE ( io, 10 ) rate_of_climb(l)
	163	WRITE ( io, 11 ) leg_mode(l)
	164	ENDDO
	165
	166
	167	1 FORMAT (' Virtual flights:'/ &
	168	' ----------------')
	169	2 FORMAT (' Output every timestep')
	170	3 FORMAT (' Number of flight legs:', I3 )
	171	4 FORMAT (' Begin of measurements:', F10.1 , ' s' )
	172	5 FORMAT (' End of measurements:', F10.1 , ' s' )
	173	6 FORMAT (' Leg', I3/, &
	174	' ------' )
	175	7 FORMAT (' Flight speed : ', F5.1, ' m/s' )
	176	8 FORMAT (' Flight level : ', F5.1, ' m' )
	177	9 FORMAT (' Maximum elevation change: ', F5.1, ' m/s' )
	178	10 FORMAT (' Rate of climb / descent : ', F5.1, ' m/s' )
	179	11 FORMAT (' Leg mode : ', A/ )
	180
	181	END SUBROUTINE flight_header
	182
	183	!------------------------------------------------------------------------------!
	184	! Description:
	185	! ------------
	186	!> Reads the namelist flight_par.
	187	!------------------------------------------------------------------------------!
	188	SUBROUTINE flight_parin
	189
	190
	191	IMPLICIT NONE
	192
	193	CHARACTER (LEN=80) :: line !< dummy string that contains the current line of the parameter file
	194
	195	NAMELIST /flight_par/ flight_angle, flight_end, flight_begin, leg_mode,&
	196	flight_level, max_elev_change, rate_of_climb, &
	197	speed_agl, x_end, x_start, y_end, y_start
	198
	199	!
	200	!-- Try to find the namelist flight_par
	201	REWIND ( 11 )
	202	line = ' '
	203	DO WHILE ( INDEX( line, '&flight_par' ) == 0 )
	204	READ ( 11, '(A)', END=10 ) line
	205	ENDDO
	206	BACKSPACE ( 11 )
	207
	208	!
	209	!-- Read namelist
	210	READ ( 11, flight_par )
	211	!
	212	!-- Set switch that virtual flights shall be carried out
	213	virtual_flight = .TRUE.
	214
	215	10 CONTINUE
	216
	217	END SUBROUTINE flight_parin
	218
	219	!------------------------------------------------------------------------------!
	220	! Description:
	221	! ------------
	222	!> Inititalization of required arrays, number of legs and flags. Moreover,
	223	!> initialize flight speed and -direction, as well as start positions.
	224	!------------------------------------------------------------------------------!
	225	SUBROUTINE flight_init
	226
	227	USE constants, &
	228	ONLY: pi
	229
	230	USE control_parameters, &
	231	ONLY: initializing_actions
	232
	233	USE indices, &
	234	ONLY: nxlg, nxrg, nysg, nyng, nzb, nzt
	235
	236	IMPLICIT NONE
	237
	238	REAL(wp) :: distance !< distance between start and end position of a flight leg
	239	!
	240	!-- Determine the number of flight legs
	241	l = 1
	242	DO WHILE ( x_start(l) /= 999999999.0_wp .AND. l <= SIZE(x_start) )
	243	l = l + 1
	244	ENDDO
	245	num_leg = l-1
	246	!
	247	!-- Check for proper parameter settings
	248	CALL flight_check_parameters
	249	!
	250	!-- Allocate and initialize logical array for flight pattern
	251	ALLOCATE( cyclic_leg(1:num_leg) )
	252	!
	253	!-- Initialize flags for cyclic/return legs
	254	DO l = 1, num_leg
	255	cyclic_leg(l) = MERGE( .TRUE., .FALSE., &
	256	TRIM( leg_mode(l) ) == 'cyclic' &
	257	)
	258	ENDDO
	259	!
	260	!-- Allocate and initialize arraxs for flight position and speed. In case of
	261	!-- restart runs these data are read by the routine read_flight_restart_data
	262	!-- instead.
	263	IF ( TRIM( initializing_actions ) /= 'read_restart_data' ) THEN
	264
	265	ALLOCATE( x_pos(1:num_leg), y_pos(1:num_leg ), z_pos(1:num_leg) )
	266	!
	267	!-- Inititalize x-, y-, and z-positions with initial start position
	268	x_pos(1:num_leg) = x_start(1:num_leg)
	269	y_pos(1:num_leg) = y_start(1:num_leg)
	270	z_pos(1:num_leg) = flight_level(1:num_leg)
	271	!
	272	!-- Allocate arrays for flight-speed components
	273	ALLOCATE( u_agl(1:num_leg), &
	274	v_agl(1:num_leg), &
	275	w_agl(1:num_leg) )
	276	!
	277	!-- Inititalize u-, v- and w-component.
	278	DO l = 1, num_leg
	279	!
	280	!-- In case of return-legs, the flight direction, i.e. the horizontal
	281	!-- flight-speed components, are derived from the given start/end
	282	!-- positions.
	283	IF ( .NOT. cyclic_leg(l) ) THEN
	284	distance = SQRT( ( x_end(l) - x_start(l) )**2 &
	285	+ ( y_end(l) - y_start(l) )**2 )
	286	u_agl(l) = speed_agl(l) * ( x_end(l) - x_start(l) ) / distance
	287	v_agl(l) = speed_agl(l) * ( y_end(l) - y_start(l) ) / distance
	288	w_agl(l) = rate_of_climb(l)
	289	!
	290	!-- In case of cyclic-legs, flight direction is directly derived from
	291	!-- the given flight angle.
	292	ELSE
	293	u_agl(l) = speed_agl(l) * COS( flight_angle(l) * pi / 180.0_wp )
	294	v_agl(l) = speed_agl(l) * SIN( flight_angle(l) * pi / 180.0_wp )
	295	w_agl(l) = rate_of_climb(l)
	296	ENDIF
	297
	298	ENDDO
	299
	300	ENDIF
	301	!
	302	!-- Initialized data output
	303	CALL flight_init_output
	304	!
	305	!-- Allocate array required for user-defined quantities if necessary.
	306	IF ( num_var_fl_user > 0 ) &
	307	ALLOCATE( var_u(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
	308	!
	309	!-- Allocate and initialize arrays containing the measured data
	310	ALLOCATE( sensor_l(1:num_var_fl,1:num_leg) )
	311	ALLOCATE( sensor(1:num_var_fl,1:num_leg) )
	312	sensor_l = 0.0_wp
	313	sensor = 0.0_wp
	314
	315	END SUBROUTINE flight_init
	316
	317
	318	!------------------------------------------------------------------------------!
	319	! Description:
	320	! ------------
	321	!> Initialization of output-variable names and units.
	322	!------------------------------------------------------------------------------!
	323	SUBROUTINE flight_init_output
	324
	325	USE control_parameters, &
	326	ONLY: cloud_droplets, cloud_physics, humidity, neutral, &
	327	passive_scalar
	328
	329	USE netcdf_interface
	330
	331	IMPLICIT NONE
	332
	333	CHARACTER(LEN=10) :: label_leg !< dummy argument to convert integer to string
	334
	335	INTEGER(iwp) :: i !< loop variable
[1960]	336	INTEGER(iwp) :: id_pt !< identifyer for labeling
	337	INTEGER(iwp) :: id_q !< identifyer for labeling
	338	INTEGER(iwp) :: id_ql !< identifyer for labeling
	339	INTEGER(iwp) :: id_s !< identifyer for labeling
	340	INTEGER(iwp) :: id_u = 1 !< identifyer for labeling
	341	INTEGER(iwp) :: id_v = 2 !< identifyer for labeling
	342	INTEGER(iwp) :: id_w = 3 !< identifyer for labeling
[1957]	343	INTEGER(iwp) :: k !< index variable
	344
	345	LOGICAL :: init = .TRUE. !< flag to distiquish calls of user_init_flight
	346	!
	347	!-- Define output quanities, at least three variables are measured (u,v,w)
	348	num_var_fl = 3
[1960]	349	IF ( .NOT. neutral ) THEN
	350	num_var_fl = num_var_fl + 1
	351	id_pt = num_var_fl
	352	ENDIF
	353	IF ( humidity ) THEN
	354	num_var_fl = num_var_fl + 1
	355	id_q = num_var_fl
	356	ENDIF
	357	IF ( cloud_physics .OR. cloud_droplets ) THEN
	358	num_var_fl = num_var_fl + 1
	359	id_ql = num_var_fl
	360	ENDIF
	361	IF ( passive_scalar ) THEN
	362	num_var_fl = num_var_fl + 1
	363	id_s = num_var_fl
	364	ENDIF
[1957]	365	!
	366	!-- Write output strings for dimensions x, y, z
	367	DO l=1, num_leg
	368
	369	IF ( l < 10 ) WRITE( label_leg, '(I1)') l
	370	IF ( l >= 10 .AND. l < 100 ) WRITE( label_leg, '(I2)') l
	371	IF ( l >= 100 .AND. l < 1000 ) WRITE( label_leg, '(I3)') l
	372
	373	dofl_dim_label_x(l) = 'x_' // TRIM( label_leg )
	374	dofl_dim_label_y(l) = 'y_' // TRIM( label_leg )
	375	dofl_dim_label_z(l) = 'z_' // TRIM( label_leg )
	376
	377	ENDDO
	378
	379	!
	380	!-- Call user routine to initialize further variables
	381	CALL user_init_flight( init )
	382	!
	383	!-- Write output labels and units for the quanities
	384	k = 1
	385	DO l=1, num_leg
	386
	387	IF ( l < 10 ) WRITE( label_leg, '(I1)') l
	388	IF ( l >= 10 .AND. l < 100 ) WRITE( label_leg, '(I2)') l
	389	IF ( l >= 100 .AND. l < 1000 ) WRITE( label_leg, '(I3)') l
	390
	391	label_leg = 'leg_' // TRIM(label_leg)
	392	DO i=1, num_var_fl
	393
[1960]	394	IF ( i == id_u ) THEN
	395	dofl_label(k) = TRIM( label_leg ) // '_u'
	396	dofl_unit(k) = 'm/s'
	397	k = k + 1
	398	ELSEIF ( i == id_v ) THEN
	399	dofl_label(k) = TRIM( label_leg ) // '_v'
	400	dofl_unit(k) = 'm/s'
	401	k = k + 1
	402	ELSEIF ( i == id_w ) THEN
	403	dofl_label(k) = TRIM( label_leg ) // '_w'
	404	dofl_unit(k) = 'm/s'
	405	k = k + 1
	406	ELSEIF ( i == id_pt ) THEN
	407	dofl_label(k) = TRIM( label_leg ) // '_pt'
	408	dofl_unit(k) = 'K'
	409	k = k + 1
	410	ELSEIF ( i == id_q ) THEN
	411	dofl_label(k) = TRIM( label_leg ) // '_q'
	412	dofl_unit(k) = 'kg/kg'
	413	k = k + 1
	414	ELSEIF ( i == id_ql ) THEN
	415	dofl_label(k) = TRIM( label_leg ) // '_ql'
	416	dofl_unit(k) = 'kg/kg'
	417	k = k + 1
	418	ELSEIF ( i == id_s ) THEN
	419	dofl_label(k) = TRIM( label_leg ) // '_s'
	420	dofl_unit(k) = 'kg/kg'
	421	k = k + 1
	422	ENDIF
[1957]	423	ENDDO
	424
	425	DO i=1, num_var_fl_user
	426	CALL user_init_flight( init, k, i, label_leg )
	427	ENDDO
	428
	429	ENDDO
	430	!
	431	!-- Finally, set the total number of flight-output quantities.
	432	num_var_fl = num_var_fl + num_var_fl_user
	433
	434	END SUBROUTINE flight_init_output
	435
	436	!------------------------------------------------------------------------------!
	437	! Description:
	438	! ------------
	439	!> This routine calculates the current flight positions and calls the
	440	!> respective interpolation routine to measures the data at the current
	441	!> flight position.
	442	!------------------------------------------------------------------------------!
	443	SUBROUTINE flight_measurement
	444
	445	USE arrays_3d, &
[1960]	446	ONLY: ddzu, ddzw, pt, q, ql, s, u, v, w, zu, zw
[1957]	447
	448	USE control_parameters, &
	449	ONLY: cloud_droplets, cloud_physics, dz, dz_stretch_level, dt_3d, &
	450	humidity, neutral, passive_scalar, simulated_time
	451
	452	USE cpulog, &
	453	ONLY: cpu_log, log_point
	454
	455	USE grid_variables, &
	456	ONLY: ddx, ddy, dx, dy
	457
	458	USE indices, &
	459	ONLY: nx, nxl, nxlg, nxr, nxrg, ny, nys, nysg, nyn, nyng, nzb, nzt
	460
	461	USE pegrid
	462
	463	IMPLICIT NONE
	464
	465	LOGICAL :: on_pe !< flag to check if current flight position is on current PE
	466
	467	REAL(wp) :: x !< distance between left edge of current grid box and flight position
	468	REAL(wp) :: y !< distance between south edge of current grid box and flight position
	469
	470	INTEGER(iwp) :: i !< index of current grid box along x
	471	INTEGER(iwp) :: j !< index of current grid box along y
	472	INTEGER(iwp) :: n !< loop variable for number of user-defined output quantities
	473
	474	CALL cpu_log( log_point(65), 'flight_measurement', 'start' )
	475	!
	476	!-- Perform flight measurement if start time is reached.
	477	IF ( simulated_time >= flight_begin .AND. &
	478	simulated_time <= flight_end ) THEN
	479
	480	sensor_l = 0.0_wp
	481	sensor = 0.0_wp
	482	!
	483	!-- Loop over all flight legs
	484	DO l=1, num_leg
	485	!
	486	!-- Update location for each leg
	487	x_pos(l) = x_pos(l) + u_agl(l) * dt_3d
	488	y_pos(l) = y_pos(l) + v_agl(l) * dt_3d
	489	z_pos(l) = z_pos(l) + w_agl(l) * dt_3d
	490	!
	491	!-- Check if location must be modified for return legs.
	492	!-- Carry out horizontal reflection if required.
	493	IF ( .NOT. cyclic_leg(l) ) THEN
	494	!
	495	!-- Outward flight, i.e. from start to end
	496	IF ( u_agl(l) >= 0.0_wp .AND. x_pos(l) > x_end(l) ) THEN
	497	x_pos(l) = 2.0_wp * x_end(l) - x_pos(l)
	498	u_agl(l) = - u_agl(l)
	499	!
	500	!-- Return flight, i.e. from end to start
	501	ELSEIF ( u_agl(l) < 0.0_wp .AND. x_pos(l) < x_start(l) ) THEN
	502	x_pos(l) = 2.0_wp * x_start(l) - x_pos(l)
	503	u_agl(l) = - u_agl(l)
	504	ENDIF
	505	!
	506	!-- Outward flight, i.e. from start to end
	507	IF ( v_agl(l) >= 0.0_wp .AND. y_pos(l) > y_end(l) ) THEN
	508	y_pos(l) = 2.0_wp * y_end(l) - y_pos(l)
	509	v_agl(l) = - v_agl(l)
	510	!
	511	!-- Return flight, i.e. from end to start
	512	ELSEIF ( v_agl(l) < 0.0_wp .AND. y_pos(l) < y_start(l) ) THEN
	513	y_pos(l) = 2.0_wp * y_start(l) - y_pos(l)
	514	v_agl(l) = - v_agl(l)
	515	ENDIF
	516	!
	517	!-- Check if flight position is out of the model domain and apply
	518	!-- cyclic conditions if required
	519	ELSEIF ( cyclic_leg(l) ) THEN
	520	!
	521	!-- Check if aircraft leaves the model domain at the right boundary
	522	IF ( ( flight_angle(l) >= 0.0_wp .AND. &
	523	flight_angle(l) <= 90.0_wp ) .OR. &
	524	( flight_angle(l) >= 270.0_wp .AND. &
	525	flight_angle(l) <= 360.0_wp ) ) THEN
	526	IF ( x_pos(l) >= ( nx + 0.5_wp ) * dx ) &
	527	x_pos(l) = x_pos(l) - ( nx + 1 ) * dx
	528	!
	529	!-- Check if aircraft leaves the model domain at the left boundary
	530	ELSEIF ( flight_angle(l) > 90.0_wp .AND. &
	531	flight_angle(l) < 270.0_wp ) THEN
	532	IF ( x_pos(l) < -0.5_wp * dx ) &
	533	x_pos(l) = ( nx + 1 ) * dx + x_pos(l)
	534	ENDIF
	535	!
	536	!-- Check if aircraft leaves the model domain at the north boundary
	537	IF ( flight_angle(l) >= 0.0_wp .AND. &
	538	flight_angle(l) <= 180.0_wp ) THEN
	539	IF ( y_pos(l) >= ( ny + 0.5_wp ) * dy ) &
	540	y_pos(l) = y_pos(l) - ( ny + 1 ) * dy
	541	!
	542	!-- Check if aircraft leaves the model domain at the south boundary
	543	ELSEIF ( flight_angle(l) > 180.0_wp .AND. &
	544	flight_angle(l) < 360.0_wp ) THEN
	545	IF ( y_pos(l) < -0.5_wp * dy ) &
	546	y_pos(l) = ( ny + 1 ) * dy + y_pos(l)
	547	ENDIF
	548
	549	ENDIF
	550	!
	551	!-- Check if maximum elevation change is already reached. If required
	552	!-- reflect vertically.
	553	IF ( rate_of_climb(l) /= 0.0_wp ) THEN
	554	!
	555	!-- First check if aircraft is too high
	556	IF ( w_agl(l) > 0.0_wp .AND. &
	557	z_pos(l) - flight_level(l) > max_elev_change(l) ) THEN
	558	z_pos(l) = 2.0_wp * ( flight_level(l) + max_elev_change(l) )&
	559	- z_pos(l)
	560	w_agl(l) = - w_agl(l)
	561	!
	562	!-- Check if aircraft is too low
	563	ELSEIF ( w_agl(l) < 0.0_wp .AND. z_pos(l) < flight_level(l) ) THEN
	564	z_pos(l) = 2.0_wp * flight_level(l) - z_pos(l)
	565	w_agl(l) = - w_agl(l)
	566	ENDIF
	567
	568	ENDIF
	569	!
	570	!-- Determine grid indices for flight position along x- and y-direction.
	571	!-- Please note, there is a special treatment for the index
	572	!-- along z-direction, which is due to vertical grid stretching.
	573	i = ( x_pos(l) + 0.5_wp * dx ) * ddx
	574	j = ( y_pos(l) + 0.5_wp * dy ) * ddy
	575	!
	576	!-- Check if indices are on current PE
	577	on_pe = ( i >= nxl .AND. i <= nxr .AND. &
	578	j >= nys .AND. j <= nyn )
	579
	580	IF ( on_pe ) THEN
	581
	582	var_index = 1
	583	!
	584	!-- Recalculate indices, as u is shifted by -0.5*dx.
	585	i = x_pos(l) * ddx
	586	j = ( y_pos(l) + 0.5_wp * dy ) * ddy
	587	!
	588	!-- Calculate distance from left and south grid-box edges.
	589	x = x_pos(l) - ( 0.5_wp - i ) * dx
	590	y = y_pos(l) - j * dy
	591	!
	592	!-- Interpolate u-component onto current flight position.
	593	CALL interpolate_xyz( u, zu, ddzu, 1.0_wp, x, y, var_index, j, i )
	594	var_index = var_index + 1
	595	!
	596	!-- Recalculate indices, as v is shifted by -0.5*dy.
	597	i = ( x_pos(l) + 0.5_wp * dx ) * ddx
	598	j = y_pos(l) * ddy
	599
	600	x = x_pos(l) - i * dx
	601	y = y_pos(l) - ( 0.5_wp - j ) * dy
	602	CALL interpolate_xyz( v, zu, ddzu, 1.0_wp, x, y, var_index, j, i )
	603	var_index = var_index + 1
	604	!
	605	!-- Interpolate w and scalar quantities. Recalculate indices.
	606	i = ( x_pos(l) + 0.5_wp * dx ) * ddx
	607	j = ( y_pos(l) + 0.5_wp * dy ) * ddy
	608	x = x_pos(l) - i * dx
	609	y = y_pos(l) - j * dy
	610	!
	611	!-- Interpolate w-velocity component.
	612	CALL interpolate_xyz( w, zw, ddzw, 0.0_wp, x, y, var_index, j, i )
	613	var_index = var_index + 1
	614	!
	615	!-- Potential temerature
	616	IF ( .NOT. neutral ) THEN
	617	CALL interpolate_xyz( pt, zu, ddzu, 1.0_wp, x, y, var_index, j, i )
	618	var_index = var_index + 1
	619	ENDIF
	620	!
[1960]	621	!-- Humidity
	622	IF ( humidity ) THEN
[1957]	623	CALL interpolate_xyz( q, zu, ddzu, 1.0_wp, x, y, var_index, j, i )
	624	var_index = var_index + 1
	625	ENDIF
	626	!
	627	!-- Liquid water content
	628	IF ( cloud_physics .OR. cloud_droplets ) THEN
	629	CALL interpolate_xyz( ql, zu, ddzu, 1.0_wp, x, y, var_index, j, i )
	630	var_index = var_index + 1
	631	ENDIF
	632	!
[1960]	633	!-- Passive scalar
	634	IF ( passive_scalar ) THEN
	635	CALL interpolate_xyz( s, zu, ddzu, 1.0_wp, x, y, var_index, j, i )
	636	var_index = var_index + 1
	637	ENDIF
	638	!
[1957]	639	!-- Treat user-defined variables if required
	640	DO n = 1, num_var_fl_user
	641	CALL user_flight( var_u, n )
	642	CALL interpolate_xyz( var_u, zu, ddzu, 1.0_wp, x, y, var_index, j, i )
	643	var_index = var_index + 1
	644	ENDDO
	645	ENDIF
	646
	647	ENDDO
	648	!
	649	!-- Write local data on global array.
	650	#if defined( __parallel )
	651	CALL MPI_ALLREDUCE(sensor_l(1,1), sensor(1,1), &
	652	num_var_fl*num_leg, MPI_REAL, MPI_SUM, &
	653	comm2d, ierr )
	654	#else
	655	sensor = sensor_l
	656	#endif
	657	ENDIF
	658
	659	CALL cpu_log( log_point(65), 'flight_measurement', 'stop' )
	660
	661	END SUBROUTINE flight_measurement
	662
	663	!------------------------------------------------------------------------------!
	664	! Description:
	665	! ------------
	666	!> This subroutine bi-linearly interpolates the respective data onto the current
	667	!> flight position.
	668	!------------------------------------------------------------------------------!
	669	SUBROUTINE interpolate_xyz( var, z_uw, ddz_uw, fac, x, y, var_ind, j, i )
	670
	671	USE control_parameters, &
	672	ONLY: dz, dz_stretch_level
	673
	674	USE grid_variables, &
	675	ONLY: dx, dy
	676
	677	USE indices, &
	678	ONLY: nzb, nzt, nxlg, nxrg, nysg, nyng
	679
	680	IMPLICIT NONE
	681
	682	INTEGER(iwp) :: i !< index along x
	683	INTEGER(iwp) :: j !< index along y
	684	INTEGER(iwp) :: k !< index along z
	685	INTEGER(iwp) :: k1 !< dummy variable
	686	INTEGER(iwp) :: var_ind !< index variable for output quantity
	687
	688	REAL(wp) :: aa !< dummy argument for horizontal interpolation
	689	REAL(wp) :: bb !< dummy argument for horizontal interpolation
	690	REAL(wp) :: cc !< dummy argument for horizontal interpolation
	691	REAL(wp) :: dd !< dummy argument for horizontal interpolation
	692	REAL(wp) :: gg !< dummy argument for horizontal interpolation
	693	REAL(wp) :: fac !< flag to indentify if quantity is on zu or zw level
	694	REAL(wp) :: var_int !< horizontal interpolated variable at current position
	695	REAL(wp) :: var_int_l !< horizontal interpolated variable at k-level
	696	REAL(wp) :: var_int_u !< horizontal interpolated variable at (k+1)-level
	697	REAL(wp) :: x !< distance between left edge of current grid box and flight position
	698	REAL(wp) :: y !< distance between south edge of current grid box and flight position
	699
	700	REAL(wp), DIMENSION(1:nzt+1) :: ddz_uw !< inverse vertical grid spacing
	701	REAL(wp), DIMENSION(nzb:nzt+1) :: z_uw !< height level
	702
	703	REAL(wp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: var !< treted quantity
	704	!
	705	!-- Calculate interpolation coefficients
	706	aa = x2 + y2
	707	bb = ( dx - x )2 + y2
	708	cc = x2 + ( dy - y )2
	709	dd = ( dx - x )2 + ( dy - y )2
	710	gg = aa + bb + cc + dd
	711	!
	712	!-- Obtain vertical index. Special treatment for grid index along z-direction
	713	!-- if flight position is above the vertical grid-stretching level.
	714	!-- fac=1 if variable is on scalar grid level, fac=0 for w-component.
	715	IF ( z_pos(l) < dz_stretch_level ) THEN
	716	k = ( z_pos(l) + fac * 0.5_wp * dz ) / dz
	717	ELSE
	718	!
	719	!-- Search for k-index
	720	DO k1=nzb, nzt
	721	IF ( z_pos(l) >= z_uw(k1) .AND. z_pos(l) < z_uw(k1+1) ) THEN
	722	k = k1
	723	EXIT
	724	ENDIF
	725	ENDDO
	726	ENDIF
	727	!
	728	!-- (x,y)-interpolation at k-level
	729	var_int_l = ( ( gg - aa ) * var(k,j,i) + &
	730	( gg - bb ) * var(k,j,i+1) + &
	731	( gg - cc ) * var(k,j+1,i) + &
	732	( gg - dd ) * var(k,j+1,i+1) &
	733	) / ( 3.0_wp * gg )
	734	!
	735	!-- (x,y)-interpolation on (k+1)-level
	736	var_int_u = ( ( gg - aa ) * var(k+1,j,i) + &
	737	( gg - bb ) * var(k+1,j,i+1) + &
	738	( gg - cc ) * var(k+1,j+1,i) + &
	739	( gg - dd ) * var(k+1,j+1,i+1) &
	740	) / ( 3.0_wp * gg )
	741	!
	742	!-- z-interpolation onto current flight postion
	743	var_int = var_int_l &
	744	+ ( z_pos(l) - z_uw(k) ) * ddz_uw(k+1) &
	745	* (var_int_u - var_int_l )
	746	!
	747	!-- Store on local data array
	748	sensor_l(var_ind,l) = var_int
	749
	750	END SUBROUTINE interpolate_xyz
	751
	752	!------------------------------------------------------------------------------!
	753	! Description:
	754	! ------------
	755	!> Perform parameter checks.
	756	!------------------------------------------------------------------------------!
	757	SUBROUTINE flight_check_parameters
	758
	759	USE arrays_3d, &
	760	ONLY: zu
	761
	762	USE control_parameters, &
	763	ONLY: bc_lr_cyc, bc_ns_cyc, dz, message_string
	764
	765	USE grid_variables, &
	766	ONLY: dx, dy
	767
	768	USE indices, &
	769	ONLY: nx, ny, nz
	770
	771	USE netcdf_interface, &
	772	ONLY: netcdf_data_format
	773
	774	IMPLICIT NONE
	775
	776	!
	777	!-- Check if start positions are properly set.
	778	DO l=1, num_leg
	779	IF ( x_start(l) < 0.0_wp .OR. x_start(l) > ( nx + 1 ) * dx ) THEN
	780	message_string = 'Start x position is outside the model domain'
	781	CALL message( 'flight_check_parameters', 'PA0431', 1, 2, 0, 6, 0 )
	782	ENDIF
	783	IF ( y_start(l) < 0.0_wp .OR. y_start(l) > ( ny + 1 ) * dy ) THEN
	784	message_string = 'Start y position is outside the model domain'
	785	CALL message( 'flight_check_parameters', 'PA0432', 1, 2, 0, 6, 0 )
	786	ENDIF
	787
	788	ENDDO
	789	!
	790	!-- Check for leg mode
	791	DO l=1, num_leg
	792	!
	793	!-- Check if leg mode matches the overall lateral model boundary
	794	!-- conditions.
	795	IF ( TRIM( leg_mode(l) ) == 'cyclic' ) THEN
	796	IF ( .NOT. bc_lr_cyc .OR. .NOT. bc_ns_cyc ) THEN
	797	message_string = 'Cyclic flight leg does not match ' // &
	798	'lateral boundary condition'
	799	CALL message( 'flight_check_parameters', 'PA0433', 1, 2, 0, 6, 0 )
	800	ENDIF
	801	!
	802	!-- Check if end-positions are inside the model domain in case of
	803	!.. return-legs.
	804	ELSEIF ( TRIM( leg_mode(l) ) == 'return' ) THEN
	805	IF ( x_end(l) > ( nx + 1 ) * dx .OR. &
	806	y_end(l) > ( ny + 1 ) * dx ) THEN
	807	message_string = 'Flight leg or parts of it are outside ' // &
	808	'the model domain'
	809	CALL message( 'flight_check_parameters', 'PA0434', 1, 2, 0, 6, 0 )
	810	ENDIF
	811	ELSE
	812	message_string = 'Unknown flight mode'
	813	CALL message( 'flight_check_parameters', 'PA0435', 1, 2, 0, 6, 0 )
	814	ENDIF
	815
	816	ENDDO
	817	!
	818	!-- Check if start and end positions are properly set in case of return legs.
	819	DO l=1, num_leg
	820
	821	IF ( x_start(l) > x_end(l) .AND. leg_mode(l) == 'return' ) THEN
	822	message_string = 'x_start position must be <= x_end ' // &
	823	'position for return legs'
	824	CALL message( 'flight_check_parameters', 'PA0436', 1, 2, 0, 6, 0 )
	825	ENDIF
	826	IF ( y_start(l) > y_end(l) .AND. leg_mode(l) == 'return' ) THEN
	827	message_string = 'y_start position must be <= y_end ' // &
	828	'position for return legs'
	829	CALL message( 'flight_check_parameters', 'PA0437', 1, 2, 0, 6, 0 )
	830	ENDIF
	831	ENDDO
	832	!
	833	!-- Check if given flight object remains inside model domain if a rate of
	834	!-- climb / descent is prescribed.
	835	DO l=1, num_leg
	836	IF ( flight_level(l) + max_elev_change(l) > zu(nz) .OR. &
	837	flight_level(l) + max_elev_change(l) <= 0.0_wp ) THEN
	838	message_string = 'Flight level is outside the model domain '
	839	CALL message( 'flight_check_parameters', 'PA0438', 1, 2, 0, 6, 0 )
	840	ENDIF
	841	ENDDO
	842	!
	843	!-- Check for appropriate NetCDF format. Definition of more than one
	844	!-- unlimited dimension is unfortunately only possible with NetCDF4/HDF5.
	845	IF ( netcdf_data_format <= 2 ) THEN
	846	message_string = 'netcdf_data_format must be > 2'
	847	CALL message( 'flight_check_parameters', 'PA0439', 1, 2, 0, 6, 0 )
	848	ENDIF
	849
	850
	851	END SUBROUTINE flight_check_parameters
	852
	853	!------------------------------------------------------------------------------!
	854	! Description:
	855	! ------------
	856	!> Skipping the flight-module variables from restart-file (binary format).
	857	!------------------------------------------------------------------------------!
	858	SUBROUTINE flight_skip_var_list
	859
	860	IMPLICIT NONE
	861
	862	CHARACTER (LEN=1) :: cdum
	863	CHARACTER (LEN=30) :: variable_chr
	864
	865	READ ( 13 ) variable_chr
	866	DO WHILE ( TRIM( variable_chr ) /= '* end flight *' )
	867	READ ( 13 ) cdum
	868	READ ( 13 ) variable_chr
	869	ENDDO
	870
	871	END SUBROUTINE flight_skip_var_list
	872
	873	!------------------------------------------------------------------------------!
	874	! Description:
	875	! ------------
	876	!> This routine reads the respective restart data.
	877	!------------------------------------------------------------------------------!
	878	SUBROUTINE flight_read_restart_data
	879
	880
	881	IMPLICIT NONE
	882
	883	CHARACTER (LEN=30) :: variable_chr !< dummy variable to read string
	884
	885
	886	READ ( 13 ) variable_chr
	887	DO WHILE ( TRIM( variable_chr ) /= '* end flight *' )
	888
	889	SELECT CASE ( TRIM( variable_chr ) )
	890
	891	CASE ( 'u_agl' )
	892	IF ( .NOT. ALLOCATED( u_agl ) ) ALLOCATE( u_agl(1:num_leg) )
	893	READ ( 13 ) u_agl
	894	CASE ( 'v_agl' )
	895	IF ( .NOT. ALLOCATED( v_agl ) ) ALLOCATE( v_agl(1:num_leg) )
	896	READ ( 13 ) v_agl
	897	CASE ( 'w_agl' )
	898	IF ( .NOT. ALLOCATED( w_agl ) ) ALLOCATE( w_agl(1:num_leg) )
	899	READ ( 13 ) w_agl
	900	CASE ( 'x_pos' )
	901	IF ( .NOT. ALLOCATED( x_pos ) ) ALLOCATE( x_pos(1:num_leg) )
	902	READ ( 13 ) x_pos
	903	CASE ( 'y_pos' )
	904	IF ( .NOT. ALLOCATED( y_pos ) ) ALLOCATE( y_pos(1:num_leg) )
	905	READ ( 13 ) y_pos
	906	CASE ( 'z_pos' )
	907	IF ( .NOT. ALLOCATED( z_pos ) ) ALLOCATE( z_pos(1:num_leg) )
	908	READ ( 13 ) z_pos
	909
	910	END SELECT
	911
	912	READ ( 13 ) variable_chr
	913
	914	ENDDO
	915
	916	END SUBROUTINE flight_read_restart_data
	917
	918	!------------------------------------------------------------------------------!
	919	! Description:
	920	! ------------
	921	!> This routine writes the respective restart data.
	922	!------------------------------------------------------------------------------!
	923	SUBROUTINE flight_write_restart_data
	924
	925	IMPLICIT NONE
	926
	927	WRITE ( 14 ) 'u_agl '
	928	WRITE ( 14 ) u_agl
	929	WRITE ( 14 ) 'v_agl '
	930	WRITE ( 14 ) v_agl
	931	WRITE ( 14 ) 'w_agl '
	932	WRITE ( 14 ) w_agl
	933	WRITE ( 14 ) 'x_pos '
	934	WRITE ( 14 ) x_pos
	935	WRITE ( 14 ) 'y_pos '
	936	WRITE ( 14 ) y_pos
	937	WRITE ( 14 ) 'z_pos '
	938	WRITE ( 14 ) z_pos
	939
	940	WRITE ( 14 ) '* end flight * '
	941
	942	END SUBROUTINE flight_write_restart_data
	943
	944
	945	END MODULE flight_mod

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