Coastal Langmuir circulations induce phase-locked modulation of bathymetric stress

Shrestha, Kalyan; Anderson, William

doi:10.1007/s10652-019-09727-4

Cited by 6 publications

(19 citation statements)

References 44 publications

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“…The LC content energy production is correlated to the vertical gradient of u L . In the D-region and U-region, the value of ∂u L /∂y is positive and negative, respectively, consistent with the phase-locked bottom shear stress found by Shrestha & Anderson (2019). As a result, the LC content energy production acts as an additional energy source and sink of u T u T xt , respectively.…”

Section: Discussionsupporting

confidence: 80%

Localizing effect of Langmuir circulations on small-scale turbulence in shallow water

et al. 2020

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Section: Discussionsupporting

confidence: 80%

Localizing effect of Langmuir circulations on small-scale turbulence in shallow water

et al. 2020

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“…2010; Van Roekel et al. 2012; Shrestha & Anderson 2019). Based on the preconception of the form of cell structure, we identify the Langmuir cells by searching for the strong downwelling motion.…”

Section: Langmuir Turbulence In the Presence Of A Canopymentioning

confidence: 99%

Generation of attached Langmuir circulations by a suspended macroalgal farm

2021

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“…Based on the above review on the previous studies of LSMs and full-depth LCs, it is expected that research on the impacts of full-depth LCs on bottom wall shear stress fluctuations in shallow-water Langmuir turbulence would be useful for improving the wall-layer model and sediment resuspension model in coastal flows. Recently, Shrestha & Anderson (2020) studied the bottom wall shear stresses in shallow-water Langmuir turbulence using wall-modelled LES based on the Craik-Leibovich (CL) equations (Craik & Leibovich 1976;Craik 1977). The significant impacts of full-depth LCs on wall shear stress fluctuations are evident from the comparison of the instantaneous fields between shallow-water Langmuir turbulence (Shrestha & Anderson 2020) and canonical wall turbulence (Abe et al 2004;Mathis et al 2013).…”

Section: Introductionmentioning

confidence: 99%

“…Recently, Shrestha & Anderson (2020) studied the bottom wall shear stresses in shallow-water Langmuir turbulence using wall-modelled LES based on the Craik-Leibovich (CL) equations (Craik & Leibovich 1976;Craik 1977). The significant impacts of full-depth LCs on wall shear stress fluctuations are evident from the comparison of the instantaneous fields between shallow-water Langmuir turbulence (Shrestha & Anderson 2020) and canonical wall turbulence (Abe et al 2004;Mathis et al 2013). Specifically, Shrestha & Anderson (2020) found that almost all of the streamwise wall shear stress fluctuations have the same signs as the streamwise velocity induced by full-depth LCs, while the correlation in canonical wall turbulence is lower, approximately 0.3 (Mathis et al 2013).…”

Section: Introductionmentioning

confidence: 99%

“…The significant impacts of full-depth LCs on wall shear stress fluctuations are evident from the comparison of the instantaneous fields between shallow-water Langmuir turbulence (Shrestha & Anderson 2020) and canonical wall turbulence (Abe et al 2004;Mathis et al 2013). Specifically, Shrestha & Anderson (2020) found that almost all of the streamwise wall shear stress fluctuations have the same signs as the streamwise velocity induced by full-depth LCs, while the correlation in canonical wall turbulence is lower, approximately 0.3 (Mathis et al 2013). Motivated by the pioneering work of Shrestha & Anderson (2020), systematic studies of the impacts of full-depth LCs on wall shear stress fluctuations in shallow-water Langmuir turbulence are called for.…”

Section: Introductionmentioning

confidence: 99%

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Bottom wall shear stress fluctuations in shallow-water Langmuir turbulence

2022

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In neutrally stratified shallow water, full-depth Langmuir cells (LCs) can interact with the turbulent benthic boundary layer and, thus, influence bottom wall shear stresses. In this paper the impacts of full-depth LCs on the streamwise and spanwise wall shear stresses are systematically studied using the database obtained from wall-resolved large-eddy simulation of shallow-water Langmuir turbulence. Analyses focus on the instantaneous wall shear stress fluctuations and the joint probability density functions between the stress fluctuations and the LCs parts of the velocity fluctuations, which show that the linear superimposition effect and nonlinear modulation effect of LCs are responsible for the spanwise organized distribution of wall shear stress fluctuations. Compared with the statistics in pure shear-driven turbulence without LCs, the mean square values of wall shear stress fluctuations in shallow-water Langmuir turbulence are enhanced by the strong linear superimposition effect of LCs, while the skewness and kurtosis are reduced by the combination of the linear superimposition effect and nonlinear modulation effect of LCs. Based on the scalings of these effects, a new predictive model of wall shear stress fluctuations is proposed for shallow-water Langmuir turbulence. The proposed model can predict the spatial distribution and statistics of wall shear stress fluctuations using the LCs parts of velocity fluctuations measured above the water bottom. Owing to the persistence of the spanwise inhomogeneity of wall shear stresses induced by full-depth LCs, the new predictive model will be useful for improving the wall-layer modelling for shallow-water Langmuir turbulent flows.

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Coastal Langmuir circulations induce phase-locked modulation of bathymetric stress

Cited by 6 publications

References 44 publications

Localizing effect of Langmuir circulations on small-scale turbulence in shallow water

Localizing effect of Langmuir circulations on small-scale turbulence in shallow water

Generation of attached Langmuir circulations by a suspended macroalgal farm

Bottom wall shear stress fluctuations in shallow-water Langmuir turbulence

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