User:Aleboyer: Difference between revisions
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Created page with "== Flow chart for dissipation estimates using shear probes == The processing of shear-probe data can be divided into the following five major steps and these steps apply to d..." |
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== | == Dissipation rate estimation == | ||
The processing of shear-probe data can be divided into the following five major steps and these steps apply to data collected with any platform or vehicle. There are many sub-steps to these major steps. The major steps are; | The processing of shear-probe data can be divided into the following five major steps and these steps apply to data collected with any platform or vehicle. There are many sub-steps to these major steps. The major steps are; | ||
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#:* Convert the shear-probe data samples into physical units | #:* Convert the shear-probe data samples into physical units | ||
#:* Convert all other signals per the recommendations of the manufacturer of the sensor or instruments that produce these signals. | #:* Convert all other signals per the recommendations of the manufacturer of the sensor or instruments that produce these signals. | ||
# Extract the profile defined in step 2. | |||
# High-pass filter the shear-probe and (optionally) the vibration data. | |||
# Identify each diss-length segment in the profile. | |||
# De-spike the shear-probe data, and track the fraction of data affected by de-spiking within each diss-length segment. This will become a quality-control metric. | |||
# Calculate the frequency spectra and cross-spectra of shear and vibrations for each diss-length segment using the method described here. | |||
# Extract the original and the vibration-coherent clean shear-probe frequency spectra. | |||
# Correct shear and vibration frequency spectra for the high-pass filter. | |||
# Correct the cleaned frequency spectra for the bias induced by the Goodman algorithm. | |||
# Convert the frequency spectra into wavenumber spectra using the mean speed for each diss-length segment. | |||
# Correct the spectra of shear for the wavenumber response of the shear probe. | |||
# Apply an iterative spectral integration algorithm to estimate the variance of shear, which is described here. | |||
# Calculate the rate of dissipation by multiplying the shear variance by | |||
Revision as of 11:43, 25 June 2021
Dissipation rate estimation
The processing of shear-probe data can be divided into the following five major steps and these steps apply to data collected with any platform or vehicle. There are many sub-steps to these major steps. The major steps are;
- Conversion to physical units.
- Determine the speed of profiling of the shear-probe through the water.
- Determine the temperature of the water.
- Convert the shear-probe data samples into physical units
- Convert all other signals per the recommendations of the manufacturer of the sensor or instruments that produce these signals.
- Extract the profile defined in step 2.
- High-pass filter the shear-probe and (optionally) the vibration data.
- Identify each diss-length segment in the profile.
- De-spike the shear-probe data, and track the fraction of data affected by de-spiking within each diss-length segment. This will become a quality-control metric.
- Calculate the frequency spectra and cross-spectra of shear and vibrations for each diss-length segment using the method described here.
- Extract the original and the vibration-coherent clean shear-probe frequency spectra.
- Correct shear and vibration frequency spectra for the high-pass filter.
- Correct the cleaned frequency spectra for the bias induced by the Goodman algorithm.
- Convert the frequency spectra into wavenumber spectra using the mean speed for each diss-length segment.
- Correct the spectra of shear for the wavenumber response of the shear probe.
- Apply an iterative spectral integration algorithm to estimate the variance of shear, which is described here.
- Calculate the rate of dissipation by multiplying the shear variance by
