[e200b7a] | 1 | !********************************************************************** |
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| 2 | ! Copyright 1998,1999,2000,2001,2002,2005,2007,2008,2009,2010 * |
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| 3 | ! Andreas Stohl, Petra Seibert, A. Frank, Gerhard Wotawa, * |
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| 4 | ! Caroline Forster, Sabine Eckhardt, John Burkhart, Harald Sodemann * |
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| 5 | ! * |
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| 6 | ! This file is part of FLEXPART. * |
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| 7 | ! * |
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| 8 | ! FLEXPART is free software: you can redistribute it and/or modify * |
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| 9 | ! it under the terms of the GNU General Public License as published by* |
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| 10 | ! the Free Software Foundation, either version 3 of the License, or * |
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| 11 | ! (at your option) any later version. * |
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| 12 | ! * |
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| 13 | ! FLEXPART is distributed in the hope that it will be useful, * |
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| 14 | ! but WITHOUT ANY WARRANTY; without even the implied warranty of * |
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| 15 | ! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
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| 16 | ! GNU General Public License for more details. * |
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| 17 | ! * |
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| 18 | ! You should have received a copy of the GNU General Public License * |
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| 19 | ! along with FLEXPART. If not, see <http://www.gnu.org/licenses/>. * |
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| 20 | !********************************************************************** |
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| 21 | |
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| 22 | subroutine windalign(u,v,ffap,ffcp,ux,vy) |
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| 23 | ! i i i i o o |
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| 24 | !***************************************************************************** |
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| 25 | ! * |
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| 26 | ! Transformation from along- and cross-wind components to u and v * |
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| 27 | ! components. * |
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| 28 | ! * |
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| 29 | ! Author: A. Stohl * |
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| 30 | ! * |
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| 31 | ! 3 June 1996 * |
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| 32 | ! * |
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| 33 | !***************************************************************************** |
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| 34 | ! * |
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| 35 | ! Variables: * |
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| 36 | ! ffap turbulent wind in along wind direction * |
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| 37 | ! ffcp turbulent wind in cross wind direction * |
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| 38 | ! u main wind component in x direction * |
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| 39 | ! ux turbulent wind in x direction * |
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| 40 | ! v main wind component in y direction * |
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| 41 | ! vy turbulent wind in y direction * |
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| 42 | ! * |
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| 43 | !***************************************************************************** |
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| 44 | |
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| 45 | implicit none |
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| 46 | |
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| 47 | real :: u,v,ffap,ffcp,ux,vy,ffinv,ux1,ux2,vy1,vy2,sinphi,cosphi |
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| 48 | real,parameter :: eps=1.e-30 |
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| 49 | |
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| 50 | |
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| 51 | ! Transform along wind components |
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| 52 | !******************************** |
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| 53 | |
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| 54 | ffinv=1./max(sqrt(u*u+v*v),eps) |
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| 55 | sinphi=v*ffinv |
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| 56 | vy1=sinphi*ffap |
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| 57 | cosphi=u*ffinv |
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| 58 | ux1=cosphi*ffap |
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| 59 | |
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| 60 | |
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| 61 | ! Transform cross wind components |
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| 62 | !******************************** |
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| 63 | |
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| 64 | ux2=-sinphi*ffcp |
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| 65 | vy2=cosphi*ffcp |
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| 66 | |
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| 67 | |
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| 68 | ! Add contributions from along and cross wind components |
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| 69 | !******************************************************* |
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| 70 | |
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| 71 | ux=ux1+ux2 |
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| 72 | vy=vy1+vy2 |
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| 73 | |
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| 74 | end subroutine windalign |
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