Characteristics of shear stratifies flows in the conditions of the sea of Japan shelf based on in-situ measurements in 2022

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Аннотация

The article presents some analysis results of in situ data of shear stratified flow measurements on the shelf of the Sea of Japan. The study of critical zones and layers is performed in terms of dimensionless Froude and Richardson parameters. It is shown that during the passage of high-intensity internal bores, sufficiently long (up to several hours) time intervals exist, which are characterized by a supercritical Froude regime, when active generation of short-period internal waves of large amplitude is predicted and occurs. The statistics of the Richardson number shows that with the lower probability estimate in the near-bottom layers during the observation period, the occurrence of shear instability is possible in 15% of cases, and its preservation is possible in 44% of cases.

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Авторлар туралы

O. Kurkina

R.E. Alekseev Nizhny Novgorod State Technical University

Email: aakurkin@nntu.ru
Ресей, Nizhny Novgorod

I. Yaroshchuk

V.I. Il’ichev Pacific Oceanological Institute, Far Eastern Branch, Russian Academy of Sciences

Email: aakurkin@nntu.ru
Ресей, Vladivostok

A. Kosheleva

V.I. Il’ichev Pacific Oceanological Institute, Far Eastern Branch, Russian Academy of Sciences

Email: aakurkin@nntu.ru
Ресей, Vladivostok

G. Dolgikh

V.I. Il’ichev Pacific Oceanological Institute, Far Eastern Branch, Russian Academy of Sciences

Email: aakurkin@nntu.ru

Academician of the RAS

Ресей, Vladivostok

E. Pelinovsky

V.I. Il’ichev Pacific Oceanological Institute, Far Eastern Branch, Russian Academy of Sciences; A.V. Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences

Email: aakurkin@nntu.ru
Ресей, Vladivostok; Nizhny Novgorod

A. Kurkin

R.E. Alekseev Nizhny Novgorod State Technical University; V.I. Il’ichev Pacific Oceanological Institute, Far Eastern Branch, Russian Academy of Sciences

Хат алмасуға жауапты Автор.
Email: aakurkin@nntu.ru
Ресей, Nizhny Novgorod; Vladivostok

Әдебиет тізімі

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2. Fig. 1. Map of the measurement area indicating the stations of the hydrophysical testing ground of the Pacific Oceanological Institute of the Far Eastern Branch of the Russian Academy of Sciences

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3. Fig. 2. Zonal and meridional velocity components measured at the INF station

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4. Fig. 3. From top to bottom: phase velocity of long linear internal waves of the first mode, maximum velocity of stratified flow and Froude number for observation data at stations S06 and INF. The critical value of the Froude number Fr = 1 is shown in red dotted line in the lower panel.

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5. Fig. 4. Gradient Richardson number Ri based on observations at stations S06 and INF. Critical values ​​Ri = 0.25 and Ri = 1 are shown by the red dotted line.

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6. Fig. 5. Scatter diagram of N2 – Sh2 calculated from observations at stations S06 and INF. Critical values ​​Ri = 0.25 and Ri = 1 are shown by the red dotted and dashed-dotted lines, respectively.

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