Decomposing velocity measurements - Revision history

CynthiaBluteau: /* References */

2022-07-05T19:08:32Z

References

← Older revision		Revision as of 19:08, 5 July 2022
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	~~==References==~~
	~~<references/>~~

	----		----
	Return to [[Preparing quality-controlled velocities]]		Return to [[Preparing quality-controlled velocities]]

CynthiaBluteau: /* Notes */

2022-07-05T19:08:17Z

Notes

← Older revision		Revision as of 19:08, 5 July 2022
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	==~~Notes~~==		==References==
	<references/>		<references/>

	----		----
	Return to [[Preparing quality-controlled velocities]]		Return to [[Preparing quality-controlled velocities]]

CynthiaBluteau at 19:08, 5 July 2022

2022-07-05T19:08:01Z

← Older revision		Revision as of 19:08, 5 July 2022
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	----		----
	Return to [[~~Velocity_point~~-~~measurements\|Velocity point-measurements' welcome page~~]]		Return to [[Preparing quality-controlled velocities]]

CynthiaBluteau at 02:10, 5 July 2022

2022-07-05T02:10:16Z

← Older revision		Revision as of 02:10, 5 July 2022
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	The quality-controlled velocities can be [[Detrending time series\|detrended]] before being further analysed to determine [[Velocity past the sensor\|mean flow past the sensor]] and [[Surface wave statistics\|surface wave statistics]]. These quantities are necessary for later choosing the appropriate [[Velocity inertial subrange model\| inertial subrange model]] for [[Spectral fitting\|spectral fitting]].		The quality-controlled velocities can be [[Detrending time series\|detrended]] before being further analysed to determine [[Velocity past the sensor\|mean flow past the sensor]] and [[Surface wave statistics\|surface wave statistics]]. These quantities are necessary for later choosing the appropriate [[Velocity inertial subrange model\| inertial subrange model]] for [[Spectral fitting\|spectral fitting]].
	Quality-controlled velocities may also need to be detrended before applying various [[Velocity despiking\|despiking]]. Because estimating <math>\varepsilon</math> is done from the spectral observations, the analysis is insensitive to this step provided that the scales shorter than the segment length ~~are retained~~.		Quality-controlled velocities may also need to be detrended before applying various [[Velocity despiking\|despiking]]. Because estimating <math>\varepsilon</math> is done from the spectral observations, the analysis is insensitive to this step provided that we don’t filter out the scales shorter than the [[Segmenting datasets\| segment length]].

	<div><ul>		<div><ul>
	<li style="display: inline-block; vertical-align: top;"> [[File:Short timeseries.png\|thumb\|none\|350px\|512 s segment of the measured velocities after applying different [[Detrending time series\|detrending methods]]]]		<li style="display: inline-block; vertical-align: top;"> [[File:Short timeseries.png\|thumb\|none\|350px\|512 s segment of the measured velocities after applying different [[Detrending time series\|detrending methods]]]]

CynthiaBluteau at 02:08, 5 July 2022

2022-07-05T02:08:49Z

← Older revision		Revision as of 02:08, 5 July 2022
Line 5:		Line 5:

	The quality-controlled velocities can be [[Detrending time series\|detrended]] before being further analysed to determine [[Velocity past the sensor\|mean flow past the sensor]] and [[Surface wave statistics\|surface wave statistics]]. These quantities are necessary for later choosing the appropriate [[Velocity inertial subrange model\| inertial subrange model]] for [[Spectral fitting\|spectral fitting]].		The quality-controlled velocities can be [[Detrending time series\|detrended]] before being further analysed to determine [[Velocity past the sensor\|mean flow past the sensor]] and [[Surface wave statistics\|surface wave statistics]]. These quantities are necessary for later choosing the appropriate [[Velocity inertial subrange model\| inertial subrange model]] for [[Spectral fitting\|spectral fitting]].
	Quality-controlled velocities may also need to be detrended before applying various [[Velocity despiking\|despiking]]. Because estimating <math>\varepsilon<\math> is done from the spectral observations, the analysis is insensitive to this step provided that the scales shorter than the segment length are retained.		Quality-controlled velocities may also need to be detrended before applying various [[Velocity despiking\|despiking]]. Because estimating <math>\varepsilon</math> is done from the spectral observations, the analysis is insensitive to this step provided that the scales shorter than the segment length are retained.

	<div><ul>		<div><ul>

CynthiaBluteau at 02:07, 5 July 2022

2022-07-05T02:07:53Z

← Older revision		Revision as of 02:07, 5 July 2022
Line 5:		Line 5:

	The quality-controlled velocities can be [[Detrending time series\|detrended]] before being further analysed to determine [[Velocity past the sensor\|mean flow past the sensor]] and [[Surface wave statistics\|surface wave statistics]]. These quantities are necessary for later choosing the appropriate [[Velocity inertial subrange model\| inertial subrange model]] for [[Spectral fitting\|spectral fitting]].		The quality-controlled velocities can be [[Detrending time series\|detrended]] before being further analysed to determine [[Velocity past the sensor\|mean flow past the sensor]] and [[Surface wave statistics\|surface wave statistics]]. These quantities are necessary for later choosing the appropriate [[Velocity inertial subrange model\| inertial subrange model]] for [[Spectral fitting\|spectral fitting]].
	Quality-controlled velocities may also need to be detrended before applying various [[Velocity despiking\|despiking]].		Quality-controlled velocities may also need to be detrended before applying various [[Velocity despiking\|despiking]]. Because estimating <math>\varepsilon<\math> is done from the spectral observations, the analysis is insensitive to this step provided that the scales shorter than the segment length are retained.

			<div><ul>
			<li style="display: inline-block; vertical-align: top;"> [[File:Short timeseries.png\|thumb\|none\|350px\|512 s segment of the measured velocities after applying different [[Detrending time series\|detrending methods]]]]
			</li>
			<li style="display: inline-block; vertical-align: top;"> [[File:Short_spectra.png\|thumb\|none\|350px\|Example velocity spectra of the short 512 s of records before and after different detrending techniques applied to the original 6h time series. The impact of the detrending method can be seen at the lowest frequencies only]] </li>
			</ul></div>

CynthiaBluteau at 14:22, 30 November 2021

2021-11-30T14:22:34Z

← Older revision		Revision as of 14:22, 30 November 2021
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	~~==Application to measured velocities==~~
	~~Measurements are typically collected in the following two ways:~~
	* continuously, or in such long bursts that they can be considered continuous
	* short bursts that are typically at most 2-3x the expected largest [[Time and length scales of turbulence\|turbulence time scales]] (e.g., 10 min in ocean environments)

CynthiaBluteau: moving up excess stuff elsewhere

2021-11-30T14:13:56Z

moving up excess stuff elsewhere

@@ Line 4: / Line 4: @@
 }}
-The quality-controlled velocities can be [[Detrending time series|detrended]] before being further analysed to determine [[Velocity past the sensor|mean flow past the sensor]] and [[Surface wave statistics|surface wave statistics]]. These quantities  are necessary for later choosing the appropriate [[Velocity inertial subrange model| inertial subrange model]] for [[Spectral fitting|spectral fitting]].
+The quality-controlled velocities can be [[Detrending time series|detrended]] before being further analysed to determine [[Velocity past the sensor|mean flow past the sensor]] and [[Surface wave statistics|surface wave statistics]]. These quantities are necessary for later choosing the appropriate [[Velocity inertial subrange model| inertial subrange model]] for [[Spectral fitting|spectral fitting]].
-Quality-controlled velocities may also need detrended before applying various [[Velocity despiking|despiking]].
+Quality-controlled velocities may also need to be detrended before applying various [[Velocity despiking|despiking]].
@@ Line 30: / Line 14: @@
 * short bursts that are typically  at most 2-3x the expected largest [[Time and length scales of turbulence|turbulence time scales]] (e.g., 10 min in ocean environments)
 ==Notes==

CynthiaBluteau: /* Application to measured velocities */

2021-11-29T21:17:46Z

Application to measured velocities

← Older revision		Revision as of 21:17, 29 November 2021
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	Measurements are typically collected in the following two ways:		Measurements are typically collected in the following two ways:
	* continuously, or in such long bursts that they can be considered continuous		* continuously, or in such long bursts that they can be considered continuous
	* short bursts that are typically at most 2-3x the expected largest [[Time and length scales of turbulence\|turbulence time scales]].		* short bursts that are typically at most 2-3x the expected largest [[Time and length scales of turbulence\|turbulence time scales]] (e.g., 10 min in ocean environments)

	~~As a rule of thumb~~, ~~turbulence estimates from the inertial subrange of velocity rely on 5 to 15~~ min ~~long [[Segmenting datasets\|segments]].~~

	==Segmenting==		==Segmenting==

CynthiaBluteau: /* Application to measured velocities */

2021-11-29T21:15:39Z

Application to measured velocities

← Older revision		Revision as of 21:15, 29 November 2021
Line 28:		Line 28:
	Measurements are typically collected in the following two ways:		Measurements are typically collected in the following two ways:
	* continuously, or in such long bursts that they can be considered continuous		* continuously, or in such long bursts that they can be considered continuous
	* short bursts that are typically at most 2-3x the expected largest turbulence time scales.		* short bursts that are typically at most 2-3x the expected largest [[Time and length scales of turbulence\|turbulence time scales]].

	As a rule of thumb, turbulence estimates from the inertial subrange of velocity rely on 5 to 15 min long [[Segmenting datasets\|segments]].		As a rule of thumb, turbulence estimates from the inertial subrange of velocity rely on 5 to 15 min long [[Segmenting datasets\|segments]].

	==Segmenting==		==Segmenting==