1 | ! SPDX-FileCopyrightText: FLEXPART 1998-2019, see flexpart_license.txt |
---|
2 | ! SPDX-License-Identifier: GPL-3.0-or-later |
---|
3 | |
---|
4 | subroutine initialize_cbl_vel(idum,zp,ust,wst,h,sigmaw,wp, ol) |
---|
5 | ! i/o i i i i i o i |
---|
6 | |
---|
7 | use par_mod, only:pi |
---|
8 | use com_mod, only:ldirect |
---|
9 | use random_mod, only: gasdev, ran3 |
---|
10 | |
---|
11 | implicit none |
---|
12 | |
---|
13 | !=============================================================================== |
---|
14 | ! CBL skewed vertical profiles and formulation of LHH 1996 with profile of w3 |
---|
15 | ! from LHB 2000 |
---|
16 | ! LHH formulation has been modified to account for variable density profiles and |
---|
17 | ! backward in time or forward in time simulations |
---|
18 | ! see Cassiani et al. BLM 2014 doi for explanations and references |
---|
19 | !=============================================================================== |
---|
20 | |
---|
21 | |
---|
22 | real :: usurad2,usurad2p,C0,costluar4,eps |
---|
23 | parameter (usurad2=0.7071067812,usurad2p=0.3989422804,C0=2,costluar4=0.66667,eps=0.000001) |
---|
24 | |
---|
25 | integer idum |
---|
26 | real :: wp,zp,ust,wst,h,dens,ddens,sigmaw,dsigmawdz,tlw,dcas,dcas1!,ran3,gasdev |
---|
27 | real :: w3,w2 |
---|
28 | real :: z, & |
---|
29 | skew, & |
---|
30 | skew2, & |
---|
31 | radw2, & |
---|
32 | fluarw,fluarw2, & |
---|
33 | rluarw, & |
---|
34 | xluarw, & |
---|
35 | aluarw, & |
---|
36 | bluarw, & |
---|
37 | sigmawa, & |
---|
38 | sigmawb, & |
---|
39 | ath, & |
---|
40 | bth, & |
---|
41 | wb,wa |
---|
42 | real timedir |
---|
43 | real ol, transition |
---|
44 | |
---|
45 | !--------------------------------------------------------------------------- |
---|
46 | timedir=ldirect !direction of time forward (1) or backward(-1) |
---|
47 | z=zp/h |
---|
48 | |
---|
49 | |
---|
50 | transition=1. |
---|
51 | if (-h/ol.lt.15) transition=((sin((((-h/ol)+10.)/10.)*pi)))/2.+0.5 !see also in cbl.f90 |
---|
52 | |
---|
53 | w2=sigmaw*sigmaw |
---|
54 | w3=(((1.2*z*((1.-z)**(3./2.)))+eps)*wst**3) *transition |
---|
55 | |
---|
56 | skew=w3/(w2**1.5) |
---|
57 | skew2=skew*skew |
---|
58 | |
---|
59 | radw2=sqrt(w2) !sigmaw |
---|
60 | |
---|
61 | fluarw=costluar4*skew**0.333333333333333 |
---|
62 | fluarw2=fluarw*fluarw |
---|
63 | rluarw=(1.+fluarw2)**3.*skew2/((3.+fluarw2)**2.*fluarw2) !-> r |
---|
64 | xluarw=rluarw**0.5 !----> r^1/2 |
---|
65 | |
---|
66 | aluarw=0.5*(1.-xluarw/(4.+rluarw)**0.5) |
---|
67 | bluarw=1.-aluarw |
---|
68 | |
---|
69 | sigmawa=radw2*(bluarw/(aluarw*(1.+fluarw2)))**0.5 |
---|
70 | sigmawb=radw2*(aluarw/(bluarw*(1.+fluarw2)))**0.5 |
---|
71 | |
---|
72 | wa=(fluarw*sigmawa) |
---|
73 | wb=(fluarw*sigmawb) |
---|
74 | |
---|
75 | dcas=ran3(idum) |
---|
76 | |
---|
77 | if (dcas.le.aluarw) then |
---|
78 | dcas1=gasdev(idum) |
---|
79 | wp=timedir*(dcas1*sigmawa+wa) |
---|
80 | else |
---|
81 | dcas1=gasdev(idum) |
---|
82 | wp=timedir*(dcas1*sigmawb-wb) |
---|
83 | end if |
---|
84 | |
---|
85 | return |
---|
86 | end subroutine initialize_cbl_vel |
---|
87 | |
---|