1 | !*********************************************************************** |
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2 | !* Copyright 2012,2013 * |
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3 | !* Jerome Brioude, Delia Arnold, Andreas Stohl, Wayne Angevine, * |
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4 | !* John Burkhart, Massimo Cassiani, Adam Dingwell, Richard C Easter, Sabine Eckhardt,* |
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5 | !* Stephanie Evan, Jerome D Fast, Don Morton, Ignacio Pisso, * |
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6 | !* Petra Seibert, Gerard Wotawa, Caroline Forster, Harald Sodemann, * |
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7 | !* This file is part of FLEXPART WRF * |
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8 | !* * |
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9 | !* FLEXPART is free software: you can redistribute it and/or modify * |
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10 | !* it under the terms of the GNU General Public License as published by* |
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11 | !* the Free Software Foundation, either version 3 of the License, or * |
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12 | !* (at your option) any later version. * |
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13 | !* * |
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14 | !* FLEXPART is distributed in the hope that it will be useful, * |
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15 | !* but WITHOUT ANY WARRANTY; without even the implied warranty of * |
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16 | !* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
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17 | !* GNU General Public License for more details. * |
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18 | !* * |
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19 | !* You should have received a copy of the GNU General Public License * |
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20 | !* along with FLEXPART. If not, see <http://www.gnu.org/licenses/>. * |
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21 | !*********************************************************************** |
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22 | |
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23 | |
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24 | subroutine initialize_cbl_vel(idum,zp,ust,wst,h,sigmaw,wp,dcas,dcas1,ol) |
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25 | ! i/o i i i i i o i i i |
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26 | ! idum: for random number but not usednot used |
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27 | ! zp: particle psition |
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28 | ! ust: velocity scale, not used |
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29 | ! wst: ocnvective velcotiy scale |
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30 | ! sigmaW: standard deviaiton of vertical velocity |
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31 | ! wp: particle velocity |
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32 | ! dcas: for random number |
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33 | ! dcas1: for random number |
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34 | ! ol: Obukhov lenght |
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35 | !=============== initilization of particle velcoity based on CBL skewed vertical profiles and formulation of LHH 1996 with profile of w3 from lHB 2000 ================== |
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36 | !=============== by Massimo Cassiani ( mc ), NILU, 2012-2013, reference to Cassiani et al. 2013.. ================== |
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37 | !================================================================================================================================================================================ |
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38 | use par_mod, only:pi |
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39 | use com_mod, only:ldirect |
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40 | ! use ieee_arithmetic |
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41 | |
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42 | implicit none |
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43 | |
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44 | |
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45 | real :: usurad2,usurad2p,C0,costluar4,eps |
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46 | parameter (usurad2=0.7071067812,usurad2p=0.3989422804,C0=2,costluar4=0.66667,eps=0.000001) |
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47 | |
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48 | integer idum |
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49 | real :: wp,zp,ust,wst,h,dens,ddens,sigmaw,dsigmawdz,tlw,dcas,dcas1,ran3,gasdev |
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50 | real :: w3,w2 |
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51 | real :: z, & |
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52 | skew, & |
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53 | skew2, & |
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54 | radw2, & |
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55 | fluarw,fluarw2, & |
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56 | rluarw, & |
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57 | xluarw, & |
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58 | aluarw, & |
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59 | bluarw, & |
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60 | sigmawa, & |
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61 | sigmawb, & |
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62 | ath, & |
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63 | bth, & |
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64 | wb,wa |
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65 | real timedir |
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66 | real ol, transition |
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67 | |
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68 | !--------------------------------------------------------------------------- |
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69 | !timedir=dble(ldirect) !direction of time forward (1) or backward(-1) |
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70 | timedir=ldirect !time direction forward (1) or backward(-1) |
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71 | z=zp/h !hn is the boundarylayer top |
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72 | |
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73 | transition=1. |
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74 | if (-h/ol.lt.15) transition=((sin((((-h/ol)+10.)/10.)*pi)))/2.+0.5 !transtion from near neutral to unstable |
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75 | |
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76 | |
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77 | !w2=(1.7*(z*(1.-0.7*z)*(1.-z))**(2./3.))*(wst**2) |
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78 | w2=sigmaw*sigmaw |
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79 | !w3=(((1.2*z*((1.-z)**(3./2.)))+eps)*wst**3) *1.5 !the 1.5 is to test with increased skeweness see also cbl.f90 |
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80 | w3=(((1.2*z*((1.-z)**(3./2.)))+eps)*wst**3)*transition |
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81 | skew=w3/(w2**1.5) |
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82 | skew2=skew*skew |
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83 | radw2=sqrt(w2) !sigmaw |
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84 | |
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85 | if (skew.ne.0) then |
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86 | fluarw=costluar4*skew**0.333333333333333 |
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87 | fluarw2=fluarw*fluarw |
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88 | rluarw=(1.+fluarw2)**3.*skew2/((3.+fluarw2)**2.*fluarw2) !-> r |
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89 | xluarw=rluarw**0.5 !(1.+fluarw2)**1.5*skew/((3.+fluarw2)*fluarw) !----> r^1/2 |
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90 | else |
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91 | fluarw=0. |
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92 | fluarw2=0. |
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93 | rluarw=0. |
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94 | xluarw=0. |
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95 | end if |
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96 | |
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97 | aluarw=0.5*(1.-xluarw/(4.+rluarw)**0.5) |
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98 | bluarw=1.-aluarw |
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99 | |
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100 | sigmawa=radw2*(bluarw/(aluarw*(1.+fluarw2)))**0.5 |
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101 | sigmawb=radw2*(aluarw/(bluarw*(1.+fluarw2)))**0.5 |
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102 | |
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103 | wa=(fluarw*sigmawa) |
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104 | wb=(fluarw*sigmawb) |
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105 | |
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106 | !dcas=ran3(idum) !pass from outside |
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107 | |
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108 | if (dcas.le.aluarw) then |
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109 | !dcas1=gasdev(idum) !pass from outside |
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110 | wp=timedir*(dcas1*sigmawa+wa) |
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111 | else |
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112 | !dcas1=gasdev(idum) !pass from outside |
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113 | wp=timedir*(dcas1*sigmawb-wb) |
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114 | end if |
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115 | ! if (ieee_is_nan(wp)) print*,'PROBLEM INIT',wp,timedir, & |
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116 | ! dcas1,sigmawa,wa,sigmawb,wb,idum,zp,ust,wst,h,sigmaw,wp,dcas,dcas1,ol |
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117 | return |
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118 | end |
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119 | |
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