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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 Jan 18 18:46:33 2012
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# (c) 2011 A.M. Thurnherr
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# uE-Info: 103 19 NIL 0 0 72 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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require "$ANTS/libvec.pl";
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require "$ANTS/libfuns.pl";
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#----------------------------------------------------------------------
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# Polzin et al., JAOT 2002 LADCP shear corrections
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#----------------------------------------------------------------------
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# NOTES:
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# - apply to downcast data only
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#----------------------------------------------------------------------
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# individual corrections
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#----------------------------------------------------------------------
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# NB: Dzb = (Dzt == Dzr) assumed
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sub T_ravg($$)
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{
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my($kz,$Dzb) =
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&antsFunUsage(2,'ff','<vertical wavenumber[rad/s]> <pulse/bin-length[m]>',@_);
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return 1 / sinc($kz*$Dzb/2/$PI)**4;
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}
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sub T_fdiff($$)
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{
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my($kz,$Dzd) =
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&antsFunUsage(2,'ff','<vertical wavenumber[rad/s]> <differencing interval[m]>',@_);
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return 1 / sinc($kz*$Dzd/2/$PI)**2;
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}
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sub T_interp($$$)
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{
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my($kz,$Dzb,$Dzg) =
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&antsFunUsage(3,'fff','<vertical wavenumber[rad/s]> <bin length[m]> <grid resolution[m]>',@_);
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return 1 / sinc($kz*$Dzb/2/$PI)**4 / sinc($kz*$Dzg/2/$PI)**2;
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}
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# NB: Polzin et al claim that Dz should be ADCP bin size, which does not seem to make sense
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sub T_binavg($$)
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{
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my($kz,$Dzg) =
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&antsFunUsage(2,'ff','<vertical wavenumber[rad/s]> <grid resolution[m]>',@_);
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return 1 / sinc($kz*$Dzg/2/$PI)**2;
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}
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sub T_tilt($$)
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{
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my($kz,$dprime) =
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&antsFunUsage(2,'ff','<vertical wavenumber[rad/s]> <d-prime[m]>',@_);
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return 1 / sinc($kz*$dprime/2/$PI)**2;
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}
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#----------------------------------------------------------------------
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# convenient combinations
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#----------------------------------------------------------------------
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sub LADCP_tilt_dprime($)
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{
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return -1.2 + 0.0857 * $_[0] - 0.000136 * $_[0]**2;
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}
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sub T_UH($$$$)
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{
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my($kz,$blen,$grez,$maxrange) =
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&antsFunUsage(4,'ffff','<vertical wavenumber[rad/s]> <ADCP bin size[m]> <shear grid resolution[m]> <max range[m]>',@_);
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return T_ravg($kz,$blen) * T_fdiff($kz,$blen) * T_interp($kz,$blen,$grez) * T_tilt($kz,LADCP_tilt_dprime($maxrange));
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}
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sub T_SM($$$$)
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{
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my($kz,$blen,$grez,$maxrange) =
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&antsFunUsage(4,'ffff','<vertical wavenumber[rad/s]> <ADCP bin size[m]> <shear grid resolution[m]> <max range[m]>',@_);
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return T_ravg($kz,$blen) * T_fdiff($kz,$blen) * T_binavg($kz,$grez) * T_tilt($kz,LADCP_tilt_dprime($maxrange));
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}
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sub T_VI($$$$$)
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{
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my($kz,$blen,$sel,$grez,$maxrange) =
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&antsFunUsage(5,'ff.ff','<vertical wavenumber[rad/s]> <ADCP bin size[m]> <superensemble size[m]|nan> <shear grid resolution[m]> <max range[m]>',@_);
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return T_VI_alt($kz,$blen,$sel,$grez,LADCP_tilt_dprime($maxrange));
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}
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sub T_VI_alt($$$$$)
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{
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my($kz,$blen,$sel,$grez,$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("$0: tilt-dprime outside range [0..$blen]\n")
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unless ($dprime>=0 && $dprime<=$blen);
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return ($sel>0) ? T_ravg($kz,$blen) * T_binavg($kz,$sel) * T_binavg($kz,$grez) * T_tilt($kz,$dprime)
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: T_ravg($kz,$blen) * T_binavg($kz,$grez) * T_tilt($kz,$dprime);
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}
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1;
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