Denoising and despiking ADV velocity and salinity concentration data in turbulent stratified flows

Hejazi, Kourosh; Falconer, Roger Alexander; Seifi, Ehsan

doi:10.1016/j.flowmeasinst.2016.09.010

Cited by 4 publications

(1 citation statement)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Durgesh et al () proposed two methods, including the noise auto‐correlation approach and the proper orthogonal decomposition approach, to attenuate Doppler noise and improve the velocity spectrum. Hejazi et al () used a linear correlation algorithm to lower the noise level and remove the spikes. There have also noise‐reduction methods requiring two independent and simultaneous measurements of the same vertical velocity component (Hurther and Lemmin ; Doroudian et al ), which apply to four beam Doppler systems.…”

Section: Discussionmentioning

confidence: 99%

Calculation of turbulent dissipation rate with acoustic Doppler velocimeter

Huang

Guo

et al. 2018

Limnology & Ocean Methods

View full text Add to dashboard Cite

Turbulent dissipation rates are calculated from an acoustic Doppler velocimeter by fitting the measured wavenumber spectrum to a universal turbulence spectrum. A combination of the Butterworth filter and empirical model decomposition is employed to reduce Doppler noise and high‐frequency fluctuations. Different from the classical inertial subrange dissipation method fitting to the Kolmogorov − 5/3 slope, we propose the method here which can make longer available spectrum bands. We analyzed 408 bursts with turbulent dissipation rates ranging from 10−8 to 10−5 W kg−1 as measured in the coastal ocean of the South China Sea and found for all of these bursts, features of the clean spectrum can be resolved to the dissipation range of turbulence, in which about 15% bursts can be resolved to the Kolmogorov wavenumber, and 51% to 1/2 Kolmogorov wavenumber. Comparisons of this method with the inertial subrange method indicated that its estimated turbulent dissipation rates were somewhat smaller than those from the inertial subrange method in most of the bursts. Their ratios had a mean value of 0.77, which is typical for oceanic turbulence measurements.

show abstract

Section: Discussionmentioning

confidence: 99%