Turbulence measurements from moving platforms

Thomson, Jim; Talbert, Joe; Klerk, Alex de; Zippel, Seth; Guerra, Maricarmen; Kilcher, Levi

doi:10.1109/cwtm.2015.7098107

Cited by 8 publications

(6 citation statements)

References 13 publications

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“…The addition of the new generation ADCPs to the float demonstrates the ability to autonomously make detailed velocity observations of both the overall upperocean boundary layer velocity structure and the smaller-scale turbulence. We anticipate that additional processing will allow these fine-scale velocity measurements to be quantitatively interpreted (Thomson et al, 2015). Numerical large-eddy simulations provide invaluable dynamical context for interpretation of the observed phenomenology of upper-ocean boundary layer evolution.…”

Section: Discussionmentioning

confidence: 99%

Rain and Sun Create Slippery Layers in the Eastern Pacific Fresh Pool

Shcherbina

D’Asaro

Harcourt

2019

Oceanog

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Section: Discussionmentioning

confidence: 99%

Rain and Sun Create Slippery Layers in the Eastern Pacific Fresh Pool

Shcherbina

D’Asaro

Harcourt

2019

Oceanog

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“…ADV and CTD data, both acquired at 16 Hz, were resampled at 15 Hz (HOLOCAM sampling frequency) and time‐stamp matched with the holograms to ensure accurate data synchronization. The customized ADV has an in‐built inertial motion unit (IMU), which enabled us to filter out the system motions from the recorded velocity (e.g., Thomson et al ). The motion correction routines applied were provided by the open source Dolfyn package.…”

Section: Data Analysis Methodsmentioning

confidence: 99%

Evidence for ubiquitous preferential particle orientation in representative oceanic shear flows

Nayak

McFarland

Sullivan

et al. 2017

Limnology & Oceanography

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In situ measurements were undertaken to characterize particle fields in undisturbed oceanic environments. Simultaneous, co‐located depth profiles of particle fields and flow characteristics were recorded using a submersible holographic imaging system and an acoustic Doppler velocimeter, under different flow conditions and varying particle concentration loads, typical of those found in coastal oceans and lakes. Nearly one million particles with major axis lengths ranging from ∼14 μm to 11.6 mm, representing diverse shapes, sizes, and aspect ratios were characterized as part of this study. The particle field consisted of marine snow, detrital matter, and phytoplankton, including colonial diatoms, which sometimes formed “thin layers” of high particle abundance. Clear evidence of preferential alignment of particles was seen at all sampling stations, where the orientation probability density function (PDF) peaked at near horizontal angles and coincided with regions of low velocity shear and weak turbulent dissipation rates. Furthermore, PDF values increased with increasing particle aspect ratios, in excellent agreement with models of spheroidal particle motion in simple shear flows. To the best of our knowledge, although preferential particle orientation in the ocean has been reported in two prior cases, our findings represent the first comprehensive field study examining this phenomenon. Evidence of nonrandom particle alignment in aquatic systems has significant consequences to aquatic optics theory and remote sensing, where perfectly random particle orientation and thus isotropic symmetry in optical parameters is assumed. Ecologically, chain‐forming phytoplankton may have evolved to form large aspect ratio chains as a strategy to optimize light harvesting.

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“…Accounting for flow induced motion of the ADV on the velocity measurements is an ongoing research topic. Several researchers have suggested correction methods and performed limited testing using the methods (Thomson et al, 2015, Durgesh et al, 2014. Readers interested in learning more about these correction methods are advised to review these references.…”

Section: Acoustic Doppler Velocimetermentioning

confidence: 99%