author | A.M. Thurnherr <athurnherr@yahoo.com> |
Thu, 05 Mar 2015 12:51:48 +0000 | |
changeset 10 | 3dfa16523886 |
parent 4 | ff72b00b4342 |
child 20 | 7ea1fd9d64e6 |
permissions | -rw-r--r-- |
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#====================================================================== |
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# L I B L A D C P . P L |
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# doc: Wed Jun 1 20:38:19 2011 |
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# dlm: Wed Jun 26 11:47:45 2013 |
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# (c) 2011 A.M. Thurnherr |
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# uE-Info: 211 0 NIL 0 0 70 2 2 4 NIL ofnI |
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#====================================================================== |
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# HISTORY: |
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# Jun 1, 2011: - created |
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# Jul 29, 2011: - improved |
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# Aug 10, 2011: - made correct |
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# Aug 11, 2011: - added "convenient combinations" |
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# Aug 18, 2011: - made buoyancy frequency non-constant in S() |
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# Jan 4, 2012: - improved T_VI to allow correcting even without superensembles |
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# Jan 5, 2012: - removed S(), which is just pwrdens/N^2 (rather than |
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# pwrdens/N^2/(2pi) as I erroneously thought) |
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# Jan 18, 2012: - added T_VI_alt() to allow assessment of tilt correction extrema |
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# Aug 22, 2012: - added documentation |
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# - added T_w() |
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# Sep 24, 2012: - made "k" argument default in T_w() |
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parents:
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# Oct 25, 2012: - renamed T_SM() to T_ASM() |
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parents:
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# Jun 26. 2013: - added T_w_z() |
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# - added parameter checks to processing-specific corrections |
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require "$ANTS/libvec.pl"; |
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require "$ANTS/libfuns.pl"; |
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#------------------------------------------------------------------------------ |
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# Spectral corrections for LADCP data |
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# |
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# NOTES: |
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# - see Polzin et al. (JAOT 2002), Thurnherr (JAOT 2012) |
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# - to correct, multiply power densities (or power, I think) with corrections |
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# - apply to down-/up-cast data only |
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#------------------------------------------------------------------------------ |
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#---------------------------------------------------------------------- |
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# 1. Corrections for individual data acquisition and processing steps |
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#---------------------------------------------------------------------- |
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#------------------------------------------------------------------------------ |
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# T_ravg(k,blen) |
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# - correct for range averaging due to finite pulse and finite receive window |
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# - this version assumes bin-length == pulse-length |
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#------------------------------------------------------------------------------ |
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sub T_ravg($$) |
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{ |
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my($k,$blen) = |
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&antsFunUsage(2,'ff','<vertical wavenumber[rad/s]> <pulse/bin-length[m]>',@_); |
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return 1 / sinc($k*$blen/2/$PI)**4; |
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} |
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#------------------------------------------------------------- |
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# T_fdiff(k,dz) |
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# - correct for first differencing on a grid with dz spacing |
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#------------------------------------------------------------- |
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sub T_fdiff($$) |
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{ |
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my($k,$dz) = |
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&antsFunUsage(2,'ff','<vertical wavenumber[rad/s]> <differencing interval[m]>',@_); |
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return 1 / sinc($k*$dz/2/$PI)**2; |
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} |
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#------------------------------------------------------------ |
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# T_interp(k,blen,dz) |
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# - correct for CODAS gridding-with-interpolation algorithm |
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# - ONLY USED IN UH SOFTWARE |
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#------------------------------------------------------------ |
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sub T_interp($$$) |
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{ |
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my($k,$blen,$dz) = |
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&antsFunUsage(3,'fff','<vertical wavenumber[rad/s]> <bin length[m]> <grid resolution[m]>',@_); |
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return 1 / sinc($k*$blen/2/$PI)**4 / sinc($k*$dz/2/$PI)**2; |
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} |
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#------------------------------------------------------------------------- |
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# T_binavg(k,dz) |
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# - correct for simple bin averaging |
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# - Polzin et al. suggest to use blen instead of dz; this must be a typo |
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#------------------------------------------------------------------------- |
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sub T_binavg($$) |
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{ |
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my($k,$dz) = |
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&antsFunUsage(2,'ff','<vertical wavenumber[rad/s]> <grid resolution[m]>',@_); |
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return 1 / sinc($k*$dz/2/$PI)**2; |
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} |
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#-------------------------------------------------------------------------------- |
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# T_tilt(k,d') |
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# - d' is a length scale that depends on tilt stats and range max |
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# - on d' == 0, T_tilt() == 1, i.e. the correction is disabled |
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# - d' = dprime(range_max) |
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# - is from a quadratic fit to three data points given by Polzin et al. |
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# - see Thurnherr (J. Tech. 2012) for notes |
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# - on range_max == 0, d' == 0, i.e. the correction is disabled |
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#-------------------------------------------------------------------------------- |
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sub T_tilt($$) |
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{ |
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my($k,$dprime) = |
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&antsFunUsage(2,'ff','<vertical wavenumber[rad/s]> <d-prime[m]>',@_); |
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return $dprime ? 1 / sinc($k*$dprime/2/$PI)**2 : 1; |
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} |
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sub dprime($) |
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{ |
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return $_[0] ? -1.2 + 0.0857 * $_[0] - 0.000136 * $_[0]**2 : 0; |
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} |
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#====================================================================== |
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# 2. Processing-Specific Corrections |
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#====================================================================== |
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#---------------------------------------------------------------------- |
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# T_UH(k,blen,dz,range_max) |
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# - UH implementation of the shear method (WOCE standard) |
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# - range_max == 0 disables tilt correction |
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#---------------------------------------------------------------------- |
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sub T_UH($$$$) |
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{ |
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my($k,$blen,$dz,$range_max) = |
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&antsFunUsage(4,'ffff','<vertical wavenumber[rad/s]> <ADCP bin size[m]> <shear grid resolution[m]> <range max[m]>',@_); |
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croak("T_UH($k,$blen,$dz,$range_max): bad parameters\n") |
ff72b00b4342
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A.M. Thurnherr <athurnherr@yahoo.com>
parents:
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unless ($k>=0 && $blen>0 && $dz>0 && $range_max>=0); |
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return T_ravg($k,$blen) * T_fdiff($k,$blen) * T_interp($k,$blen,$dz) * T_tilt($k,dprime($range_max)); |
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} |
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#---------------------------------------------------------------------- |
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# T_ASM(k,blen,dz,range_max) |
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# - re-implemented shear method with simple depth binning |
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# - range_max == 0 disables tilt correction |
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#---------------------------------------------------------------------- |
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sub T_ASM($$$$) |
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{ |
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my($k,$blen,$dz,$range_max) = |
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&antsFunUsage(4,'ffff','<vertical wavenumber[rad/s]> <ADCP bin size[m]> <shear grid resolution[m]> <range max[m]>',@_); |
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croak("T_ASM($k,$blen,$dz,$range_max): bad parameters\n") |
ff72b00b4342
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parents:
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unless ($k>=0 && $blen>0 && $dz>0 && $range_max>=0); |
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return T_ravg($k,$blen) * T_fdiff($k,$blen) * T_binavg($k,$dz) * T_tilt($k,dprime($range_max)); |
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} |
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#------------------------------------------------------------ |
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# T_VI(k,blen,preavg_dz,grid_dz,range_max) |
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# T_VI_alt(k,blen,preavg_dz,grid_dz,dprime) |
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# - velocity inversion method of Visbeck (J. Tech., 2002) |
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# - only valid if pre-averaging into superensembles is used |
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# - range_max == 0 disables tilt correction |
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# - sel == nan disables pre-averaging correction |
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#------------------------------------------------------------ |
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sub T_VI($$$$$) |
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{ |
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my($k,$blen,$sel,$dz,$range_max) = |
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&antsFunUsage(5,'ff.ff','<vertical wavenumber[rad/s]> <ADCP bin size[m]> <superensemble size[m]|nan> <shear grid resolution[m]> <range max[m]>',@_); |
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return T_VI_alt($k,$blen,$sel,$dz,dprime($range_max)); |
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} |
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sub T_VI_alt($$$$$) |
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{ |
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my($k,$blen,$sel,$dz,$dprime) = |
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&antsFunUsage(5,'ff.ff','<vertical wavenumber[rad/s]> <ADCP bin size[m]> <superensemble size[m]|nan> <shear grid resolution[m]> <tilt d-prime[m]>',@_); |
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croak("T_VI_alt($k,$blen,$sel,$dz,$range_max): bad parameters\n") |
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parents:
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unless ($k>=0 && $blen>0 && $sel ne '' && $dz>0 && $range_max>=0); |
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croak("$0: tilt-dprime outside range [0..$blen]\n") |
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unless ($dprime>=0 && $dprime<=$blen); |
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return ($sel>0) ? T_ravg($k,$blen) * T_binavg($k,$sel) * T_binavg($k,$dz) * T_tilt($k,$dprime) |
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: T_ravg($k,$blen) * T_binavg($k,$dz) * T_tilt($k,$dprime); |
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} |
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#---------------------------------------------------------------------- |
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# T_w(k,blen,dz,range_max) |
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# - vertical-velocity method of Thurnherr (IEEE 2011) |
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# - range_max == 0 disables tilt correction |
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#---------------------------------------------------------------------- |
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{ my(@fc); |
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sub T_w(@) |
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{ |
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my($k,$blen,$dz,$range_max) = |
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&antsFunUsage(4,'ffff', |
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'[vertical wavenumber[rad/s]] <ADCP bin size[m]> <output grid resolution[m]> <range max[m]>', |
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\@fc,'k',undef,undef,undef,@_); |
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croak("T_w($k,$blen,$dz,$range_max): bad parameters\n") |
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parents:
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unless ($k>=0 && $blen>0 && $dz>0 && $range_max>=0); |
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return T_ravg($k,$blen) * T_binavg($k,$dz) * T_tilt($k,dprime($range_max)); |
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} |
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} |
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#---------------------------------------------------------------------- |
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# T_w_z(k,blen,dz,range_max) |
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# - vertical-velocity method of Thurnherr (IEEE 2011) |
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# - first differencing of gridded shear to calculate dw/dz |
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# - NB: grid-scale differentiation assumed |
ff72b00b4342
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parents:
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# - range_max == 0 disables tilt correction |
ff72b00b4342
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parents:
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#---------------------------------------------------------------------- |
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parents:
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{ my(@fc); |
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A.M. Thurnherr <athurnherr@yahoo.com>
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sub T_w_z(@) |
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{ |
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my($k,$blen,$dz,$range_max) = |
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parents:
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&antsFunUsage(4,'ffff', |
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'[vertical wavenumber[rad/s]] <ADCP bin size[m]> <output grid resolution[m]> <range max[m]>', |
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parents:
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\@fc,'k',undef,undef,undef,@_); |
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parents:
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croak("T_w_z($k,$blen,$dz,$range_max): bad parameters\n") |
ff72b00b4342
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parents:
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unless ($k>=0 && $blen>0 && $dz>0 && $range_max>=0); |
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return T_ravg($k,$blen) * T_binavg($k,$dz) * T_tilt($k,dprime($range_max)) * T_fdiff($k,$dz); |
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} |
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} |
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1; |