10.4.1_peseiGFS_025bugfixes+enhancementsdevrelease-10release-10.4.1scaling-bug
Last change
on this file since 3d7eebf was
92fab65,
checked in by Ignacio Pisso <ip@…>, 5 years ago
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add SPDX-License-Identifier to all .f90 files
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Property mode set to
100644
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File size:
948 bytes
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1 | ! SPDX-FileCopyrightText: FLEXPART 1998-2019, see flexpart_license.txt |
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2 | ! SPDX-License-Identifier: GPL-3.0-or-later |
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3 | |
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4 | real function psim(z,al) |
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5 | |
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6 | !********************************************************************** |
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7 | ! * |
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8 | ! DESCRIPTION: CALCULATION OF THE STABILITY CORRECTION FUNCTION FOR * |
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9 | ! MOMENTUM AS FUNCTION OF HEIGHT Z AND OBUKHOV SCALE * |
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10 | ! HEIGHT L * |
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11 | ! * |
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12 | !********************************************************************** |
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13 | |
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14 | use par_mod |
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15 | |
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16 | implicit none |
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17 | |
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18 | real :: z,al,zeta,x,a1,a2 |
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19 | |
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20 | zeta=z/al |
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21 | if(zeta.le.0.) then |
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22 | ! UNSTABLE CASE |
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23 | x=(1.-15.*zeta)**0.25 |
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24 | a1=((1.+x)/2.)**2 |
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25 | a2=(1.+x**2)/2. |
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26 | psim=log(a1*a2)-2.*atan(x)+pi/2. |
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27 | else |
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28 | ! STABLE CASE |
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29 | psim=-4.7*zeta |
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30 | endif |
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31 | |
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32 | end function psim |
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