Internal seiche climatology in a small lake where transversal and second vertical modes are usually observed

Roget, Elena; Salvadè, G.; Zamboni, F.

doi:10.4319/lo.1997.42.4.0663

Cited by 35 publications

(45 citation statements)

References 12 publications

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“…So, in general, the horizontal modes in 2013 were higher. The development of nodal lines at locations where the transversal section is relatively small in comparison to the mean transversal area of the lake is well known (Roget et al, 1997;Imam et al, 2013). According to our results, the decrease of 3.2 m in the surface level between 2006 and 2013 seems to have favored the development of a nodal line at a seal near the entrance to Chernyshev Bay, where the depth was less than 5 m in 2013.…”

Section: Horizontal Structure Of the Internal Seichesmentioning

confidence: 58%

“…In 2006, however, the longitudinal mode of 11 h also had a transversal structure at the southern part of the lake and in 2013 the longitudinal mode of 7 h had a crosswise nodal line encompassing 0.4 • of latitude. The importance of the wind pattern in determining the standing waves that become excited from the spectrum of possibilities has been illustrated by different authors (Valerio et al, 2012) and the excitement of longitudinal seiches with a transversal structure at the wider and deeper lobe has also been documented in a small lake as the standard response to an oblique or transversal wind forcing (Roget et al, 1997).…”

Section: Horizontal Structure Of the Internal Seichesmentioning

confidence: 99%

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The internal seiche field in the changing South Aral Sea (2006–2013)

Roget

Khimchenko

Forcat

et al. 2017

Hydrol. Earth Syst. Sci.

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Abstract. Internal standing waves (seiches) in the South Aral Sea are studied for the first time. The study, based on numerical simulations and field data, focuses on two different campaigns: the first in autumn 2006, when the stratification was weak and there was a mild prevailing northeasterly wind, and the second in autumn 2013, when the stratification was strong and there was a mild easterly wind. Between these two campaigns, the sea surface level decreased by 3.2 m. The periods of the fundamental modes were identified as 36 and 14 h, respectively. In both years, either second or third vertical modes were found. In general, the vertical modes in 2013 were higher because of the broad and strong pycnocline. For both years, it was found that the deep quasi-homogeneous mixed upper layer could sustain internal waves under mild wind conditions. The observed first and second vertical modes in 2006 are the first and second horizontal modes and the second and third vertical modes in 2013 are the second and third horizontal modes. The results suggest that, due to sea level variations, the neck connecting the Chernyshev Bay to the main body of the lake can become a critical location for the development of a nodal line for all principal oscillation modes. Rotation effects on waves were not analyzed in this study.

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Section: Horizontal Structure Of the Internal Seichesmentioning

confidence: 58%

Section: Horizontal Structure Of the Internal Seichesmentioning

confidence: 99%

The internal seiche field in the changing South Aral Sea (2006–2013)

Roget

Khimchenko

Forcat

et al. 2017

Hydrol. Earth Syst. Sci.

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“…The PK69 model has been widely accepted within the oceanographic community (Gregg 1999), which also uses the very similar Nasmyth (1970, hereafter N70) model obtained experimentally. Regarding microstructure temperature, the spectral model proposed by Batchelor (1959, hereafter B59) is widely accepted and extensively used in oceanic and limnic waters to obtain « (Wü est et al 1996;Saggio and Imberger 2001), but lately proposals have been made (Nash and Moum 2002;Roget et al 2006;Sanchez and Roget 2007) to consider the alternative model given by Kraichnan (1968, hereafter K68).…”

Section: Introductionmentioning

confidence: 99%

Small-Scale Spectrum of a Scalar Field in Water: The Batchelor and Kraichnan Models

Sanchez

Roget

Planella

et al. 2011

Journal of Physical Oceanography

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The theoretical models of Batchelor and Kraichnan, which account for the smallest scales of a scalar field passively advected by a turbulent fluid (Prandtl . 1), have been validated using shear and temperature profiles measured with a microstructure profiler in a lake. The value of the rate of dissipation of turbulent kinetic energy « has been computed by fitting the shear spectra to the Panchev and Kesich theoretical model and the one-dimensional spectra of the temperature gradient, once « is known, to the Batchelor and Kraichnan models and from it determining the value of the turbulent parameter q. The goodness of the fit between the spectra corresponding to these models and the measured data shows a very clear dependence on the degree of isotropy, which is estimated by the Cox number. The Kraichnan model adjusts better to the measured data than the Batchelor model, and the values of the turbulent parameter that better fit the experimental data are q B 5 4.4 6 0.8 and q K 5 7.9 6 2.5 for Batchelor and Kraichnan, respectively, when Cox $ 50. Once the turbulent parameter is fixed, a comparison of the value of « determined from fitting the thermal gradient spectra to the value obtained after fitting the shear spectra shows that the Kraichnan model gives a very good estimate of the dissipation, which the Batchelor model underestimates.

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“…Observations of high-vertical mode internal waves are seldom reported because these modes have been traditionally deemed rare in nature (e.g., Stevens and Lawrence 1997). Second vertical modes, for example, have been reported by LaZerte (1980), Wiegan and Chamberlain (1987), and Roget et al (1997), among others. Mü nnich et al (1992) showed that the second vertical mode V2H1 is dominant in the internal wave field of Alpnacher See, a side basin of Lake Lucerne.…”

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confidence: 99%

The seasonal evolution of high vertical‐mode internal waves in a deep reservoir

Vidal

Rueda

Casamitjana

2007

Limnology & Oceanography

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The causal mechanism and seasonal evolution of the internal wave field in a deep, warm, monomictic reservoir are examined through the analysis of field observations and numerical techniques. The study period extends from the onset of thermal stratification in the spring until midsummer in 2005. During this time, wind forcing was periodic, with a period of 24 h (typical of land-sea breezes), and the thermal structure in the lake was characterized by the presence of a shallow surface layer overlying a thick metalimnion, typical of small to medium sized reservoirs with deep outtakes. Basin-scale internal seiches of high vertical mode (ranging from mode V3 to V5) were observed in the metalimnion. The structure of the dominant modes of oscillation changed as stratification evolved on seasonal timescales, but in all cases, their periods were close to that of the local wind forcing (i.e., 24 h), suggesting a resonant response. Nonresonant oscillatory modes of type V1 and V2 became dominant after large frontal events, which disrupted the diurnal periodicity of the wind forcing.

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Internal seiche climatology in a small lake where transversal and second vertical modes are usually observed

Cited by 35 publications

References 12 publications

The internal seiche field in the changing South Aral Sea (2006–2013)

The internal seiche field in the changing South Aral Sea (2006–2013)

Small-Scale Spectrum of a Scalar Field in Water: The Batchelor and Kraichnan Models

The seasonal evolution of high vertical‐mode internal waves in a deep reservoir

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