source: palm/trunk/SOURCE/disturb_heatflux.f90 @ 4598

Last change on this file since 4598 was 4360, checked in by suehring, 16 months ago

Bugfix in output of time-averaged plant-canopy quanities; Output of plant-canopy data only where tall canopy is defined; land-surface model: fix wrong location strings; tests: update urban test case; all source code files: copyright update

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1!> @file disturb_heatflux.f90
2!------------------------------------------------------------------------------!
3! This file is part of the PALM model system.
4!
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.
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!
17! Copyright 1997-2020 Leibniz Universitaet Hannover
18!------------------------------------------------------------------------------!
19!
20! Current revisions:
21! ------------------
22!
23!
24! Former revisions:
25! -----------------
26! $Id: disturb_heatflux.f90 4360 2020-01-07 11:25:50Z suehring $
27! Corrected "Former revisions" section
28!
29! 3761 2019-02-25 15:31:42Z raasch
30! unsed variables removed
31!
32! 3719 2019-02-06 13:10:18Z kanani
33! Moved log_points out of subroutine into time_integration for better overview.
34!
35! 3655 2019-01-07 16:51:22Z knoop
36! unused variable removed
37!
38! Revision 1.1  1998/03/25 20:03:47  raasch
39! Initial revision
40!
41!
42! Description:
43! ------------
44!> Generate random, normally distributed heatflux values and store them as the
45!> near-surface heatflux.
46!------------------------------------------------------------------------------!
47 SUBROUTINE disturb_heatflux( surf )
48 
49
50    USE arrays_3d,                                                             &
51        ONLY:  heatflux_input_conversion
52       
53    USE control_parameters,                                                    &
54        ONLY:  iran, surface_heatflux, random_generator, wall_heatflux
55       
56    USE kinds
57   
58    USE indices,                                                               &
59        ONLY:  nzb
60
61    USE random_generator_parallel,                                             &
62        ONLY:  random_number_parallel, random_seed_parallel, random_dummy,     &
63               seq_random_array
64
65    USE surface_mod,                                                           &
66        ONLY:  surf_type
67
68    IMPLICIT NONE
69
70    INTEGER(iwp) ::  i  !< grid index, x direction
71    INTEGER(iwp) ::  j  !< grid index, y direction
72    INTEGER(iwp) ::  k  !< grid index, z direction
73    INTEGER(iwp) ::  m  !< loop variables over surface elements
74   
75    REAL(wp) ::  random_gauss  !<
76    REAL(wp) ::  randomnumber  !<
77
78    TYPE(surf_type) ::  surf   !< surface-type variable
79
80
81!
82!-- Generate random disturbances and store them. Note, if
83!-- random_generator /= 'random-parallel' it is not guaranteed to obtain 
84!-- the same random distribution if the number of processors is changed.
85    IF ( random_generator /= 'random-parallel' )  THEN
86
87       DO  m = 1, surf%ns
88
89          k = surf%k(m)
90
91          randomnumber = random_gauss( iran, 5.0_wp )     
92!
93!--       k-1 is topography top index. If this is 0, set surface heatflux. Over
94!--       topography surface_heatflux is replaced by wall_heatflux(0).
95          IF ( k-1 == 0 )  THEN
96             surf%shf(m) = randomnumber * surface_heatflux                     &
97                              * heatflux_input_conversion(nzb)
98          ELSE
99             surf%shf(m) = randomnumber * wall_heatflux(0)                     &
100                              * heatflux_input_conversion(k-1)
101          ENDIF
102       ENDDO
103    ELSE
104
105       DO  m = 1, surf%ns
106
107          i = surf%i(m)
108          j = surf%j(m)
109          k = surf%k(m)
110
111          CALL random_seed_parallel( put=seq_random_array(:, j, i) )
112          CALL random_number_parallel( random_dummy )   
113!
114!--       k-1 is topography top index. If this is 0, set surface heatflux. Over
115!--       topography surface_heatflux is replaced by wall_heatflux(0).
116          IF ( k-1 == 0 )  THEN
117             surf%shf(m) = ( random_dummy - 0.5_wp ) * surface_heatflux        &
118                              * heatflux_input_conversion(nzb)
119          ELSE
120             surf%shf(m) = ( random_dummy - 0.5_wp ) * wall_heatflux(0)        &
121                              * heatflux_input_conversion(k-1)
122          ENDIF
123
124          CALL random_seed_parallel( get=seq_random_array(:, j, i) )
125
126       ENDDO
127
128    ENDIF
129
130
131 END SUBROUTINE disturb_heatflux
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