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- W4238017712 abstract "<p>The Reynolds stress tensor (RST) is the key characteristic of turbulence describing the paths of turbulent kinetic energy transfer and its anisotropy. Despite recent technical advances in application of multi-beam acoustic Doppler current profilers (ADCPs) to in situ acquiring of the RST components, derivation of the full Reynolds tensor from raw flow measurements remains a challenging problem. We present a method for derivation of the full set of turbulent stresses, based on combined use of two ADCPs with two beams from adjacent devices crossing at some point. &#160;In the proposed framework, two 3-beam ADCPs with vertically aligned axes constitute the minimum configuration sufficient to derive 6 equations for all 6 RST components.&#160;<br>The method was applied to studying turbulence in a convectively mixed layer in ice-covered Lake Kilpisj&#228;rvi. The calculated dynamics of all six stress components revealed diurnal periodicity along with the variations with the periods of a few hours. The pulsations intensities (diagonal components of RST) remained positive except short outliers; less than 5% of cases did not meet the so-called realizability requirements (positive definiteness of the stress matrix). The off-diagonal stresses demonstrated sign-changing dynamics, mirroring the inter-component energy transfer.<br>The ratio of pulsation intensities along vertical and horizontal axes varied in the range from 0.02 to 0.25. The r.m.s. values of horizontal and vertical pulsations reached diurnal maximums of 4 and 1 mm/s correspondingly, the latter being close to 1/3 of the convective velocity w*, in accordance with the previous studies on free convection.&#160;<br>The new approach provides an immediate insight into the internal structure of the turbulent boundary mixing, especially relevant to anisotropic non-stationary flows, like buoyancy-driven convection. The preliminary results on under-ice convection elucidate strong anisotropy of the convective flow &#8212; a key to understanding the heat and mass transport in ice-covered waters.</p>" @default.
- W4238017712 created "2022-05-12" @default.
- W4238017712 creator A5041013168 @default.
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- W4238017712 date "2021-03-04" @default.
- W4238017712 modified "2023-10-17" @default.
- W4238017712 title "Deriving the full turbulent stress tensor from paired ADCP measurements: application to under-ice convection" @default.
- W4238017712 doi "https://doi.org/10.5194/egusphere-egu21-5304" @default.
- W4238017712 hasPublicationYear "2021" @default.
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