The influence of stable stratification on the transition to turbulence in a temporal mixing layer

Martinez, Denise Maria Varella; Schettini, Edith Beatriz Camaño; Silvestrini, Jorge Hugo

doi:10.1590/s1678-58782006000200014

Cited by 2 publications

(2 citation statements)

References 25 publications

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“…The chance for turbulence to occur is smaller in conditions of strong water stratification so that a greater turbulent energy is needed to counter the large vertical gradient of density (Fer et al, 2004). The dynamics of water mass mixing in a stably stratified layer is regulated by vertical current shear as the basis of the buoyant flow (Martinez et al 2006).…”

Section: 𝑇𝑑 = 𝑧𝑎 − 𝑧𝑏mentioning

confidence: 99%

Analysis of Characteristics and Turbulent Mixing of Seawater Mass in Lombok Strait

et al. 2021

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The Lombok Strait, as one of the outlet straits, is part of the ITF route, which is directly adjacent to the Indian Ocean. There is a sill in the Lombok Strait, which is a place for internal wave generation. Leg-1 data from the Japan Agency for Marine-Earth Science and Technology in collaboration with the Agency for the Assessment and Application of Technology which is part of the Tropical Ocean Climate Study Expedition including CTD Yoyo and ADCP taken using ship vehicles R/V Kaiyo. CTD Snapshot from PUSHIDROSAL using the KRI Spica 934 vehicle part of the Opssurta Baruna Jaya 2 Expedition. Determination of seawater mass stratification with the criteria for the thermocline layer is ≥ 0.05 °C.m-1. Four types of water masses were identified, Java Sea, mixed seawater mass (Java Sea - ITF) which occurred diapycnal mixing, North Pacific Subtropical Water (NPSW) and North Pacific Intermediate Water (NPIW). The seawater mass stratification in the Lombok Strait based on temperature, salinity and density which are seen to follow the internal tidal pattern. The average values for energy dissipation and vertical diffusivity for each layer and replication were 5.73 x 10-7 W.Kg-1 and 3.67 x 10-2 m2.s-1 for CTD Yoyo and 2.25 x 10-6 W.Kg-1 and 7.38 x 10-2 m2.s-1 for CTD Snapshot. The value obtained is greater than the open ocean and straits in other studies. The high shear value confirms this in the thermocline layer. The Richardson gradient value> 0.25 is relatively constant in the thermocline layer.

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Section: 𝑇𝑑 = 𝑧𝑎 − 𝑧𝑏mentioning

confidence: 99%

Analysis of Characteristics and Turbulent Mixing of Seawater Mass in Lombok Strait

et al. 2021

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“…Recently, Martinez et al (2006) numerically studied the influence of stable stratification on turbulence in a mixing layer, concluding that high stratification weakens vertical motions and streamwise vortices, which should induce lateral motions, and decreases the thickness of the mixing layer. All of these theoretical predictions support our discussion given above.…”

Section: Estimates Based On the Recent Conceptmentioning

confidence: 99%

Stability Dependence of Canopy Flows over a Flat Larch Forest

Kobayashi

Hiyama

2011

Boundary-Layer Meteorol

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The dependence on atmospheric stability of flow characteristics adjacent to a very rough surface was investigated in a larch forest in Japan. Micrometeorological measurements of three-dimensional wind velocity and air temperature were taken at two heights above the forest, namely 1.7 and 1.2 times the mean canopy height h. Under near-neutral and stable conditions, the observed turbulence statistics suggest that the flow was likely to be that of the atmospheric surface layer (ASL) at 1.7h, and of the roughness sublayer (RSL) at 1.2h. However, in turbulence spectra, canopy-induced large coherent motions appeared clearly at both heights. Even under strongly stable conditions, the large-scale motions were retained at 1.2h, whereas they were overwhelmed by small-scale motions at 1.7h. This phenomenon was probably due to the enhanced contribution of the ASL turbulence associated with nocturnal decay of the RSL depth, because the small-scale motions appeared at frequencies close to the peak frequencies of well-known ASL spectra. This result supports the relatively recent concept that canopy flow is a superimposition of coherent motions and the ASL turbulence. The large-scale motions were retained in temperature spectra over a wider region of stability compared to streamwise wind spectra, suggesting that a canopy effect extended higher up for temperature than wind. The streamwise spacing of dominant eddies according to the plane mixing-layer analogy was only valid in a narrow range at near neutral, and it was stabilised at nearly half its value under stable conditions.

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The influence of stable stratification on the transition to turbulence in a temporal mixing layer

Cited by 2 publications

References 25 publications

Analysis of Characteristics and Turbulent Mixing of Seawater Mass in Lombok Strait

Analysis of Characteristics and Turbulent Mixing of Seawater Mass in Lombok Strait

Stability Dependence of Canopy Flows over a Flat Larch Forest

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