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!**********************************************************************
! Copyright 1998,1999,2000,2001,2002,2005,2007,2008,2009,2010 *
! Andreas Stohl, Petra Seibert, A. Frank, Gerhard Wotawa, *
! Caroline Forster, Sabine Eckhardt, John Burkhart, Harald Sodemann *
! *
! This file is part of FLEXPART. *
! *
! FLEXPART is free software: you can redistribute it and/or modify *
! it under the terms of the GNU General Public License as published by*
! the Free Software Foundation, either version 3 of the License, or *
! (at your option) any later version. *
! *
! FLEXPART is distributed in the hope that it will be useful, *
! but WITHOUT ANY WARRANTY; without even the implied warranty of *
! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
! GNU General Public License for more details. *
! *
! You should have received a copy of the GNU General Public License *
! along with FLEXPART. If not, see <http://www.gnu.org/licenses/>. *
!**********************************************************************
subroutine windalign(u,v,ffap,ffcp,ux,vy)
! i i i i o o
!*****************************************************************************
! *
! Transformation from along- and cross-wind components to u and v *
! components. *
! *
! Author: A. Stohl *
! *
! 3 June 1996 *
! *
!*****************************************************************************
! *
! Variables: *
! ffap turbulent wind in along wind direction *
! ffcp turbulent wind in cross wind direction *
! u main wind component in x direction *
! ux turbulent wind in x direction *
! v main wind component in y direction *
! vy turbulent wind in y direction *
! *
!*****************************************************************************
implicit none
real :: u,v,ffap,ffcp,ux,vy,ffinv,ux1,ux2,vy1,vy2,sinphi,cosphi
real,parameter :: eps=1.e-30
! Transform along wind components
!********************************
ffinv=1./max(sqrt(u*u+v*v),eps)
sinphi=v*ffinv
vy1=sinphi*ffap
cosphi=u*ffinv
ux1=cosphi*ffap
! Transform cross wind components
!********************************
ux2=-sinphi*ffcp
vy2=cosphi*ffcp
! Add contributions from along and cross wind components
!*******************************************************
ux=ux1+ux2
vy=vy1+vy2
end subroutine windalign
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