hydrophysicsФундаментальная и прикладная гидрофизикаFundamental and Applied Hydrophysics2073-66732782-5221St. Petersburg Research Center of the Russian Academy of Sciences10.59887/2073-6673.2023.16(2)-6hydrophysics-1216Research ArticleГИДРОФИЗИЧЕСКИЕ И БИОГЕОХИМИЧЕСКИЕ ПОЛЯ И ПРОЦЕССЫHYDROPHYSICAL AND BIOGEOCHEMICAL FIELDS AND PROCESSESОценка эффективности перемешивания небольшого димиктического озера при поверхностном выхолаживанииEstimation of mixing efficiency of a small dimictic lake due to surface coolinghttps://orcid.org/0000-0003-4150-2712БогдановС. Р.BogdanovS. R.

БОГДАНОВ Сергей Рэмович

РИНЦ Author ID: 147395, Scopus Author ID: 22950031500, WoS ResearcherID: Y-5047–2019

185030, Республика Карелия, г. Петрозаводск, пр. Александра Невского, 50

185030, Aleksander Nevsky st., 50 Petrozavodsk, Republic of Karelia

Sergey.R.Bogdanov@mail.ruhttps://orcid.org/0000-0003-1540-3788ПальшинН. И.PalshinN. I.

ПАЛЬШИН Николай Иннокентьевич

РИНЦ Author ID: 69931, Scopus Author ID: 6701733667, WoS ResearcherID: L-8634–2013

185030, Республика Карелия, г. Петрозаводск, пр. Александра Невского, 50

185030, Aleksander Nevsky st., 50 Petrozavodsk, Republic of Karelia

npalshin@mail.ruhttps://orcid.org/0000-0003-1695-4872ЗдоровенновР. Э.ZdorovennovR. E.

ЗДОРОВЕННОВ Роман Эдуардович

РИНЦ Author ID: 135760, Scopus Author ID: 8847365600, WoS ResearcherID: L-8294–2013

185030, Республика Карелия, г. Петрозаводск, пр. Александра Невского, 50

185030, Aleksander Nevsky st., 50 Petrozavodsk, Republic of Karelia

romga74@gmail.comМитроховА. В.MitrokhovA. V.

МИТРОХОВ Андрей Васильевич

РИНЦ Author ID: 599520, Scopus Author ID: 35103038600

185030, Республика Карелия, г. Петрозаводск, пр. Александра Невского, 50

185030, Aleksander Nevsky st., 50 Petrozavodsk, Republic of Karelia

a.mitrokhov@list.ruhttps://orcid.org/0009-0001-5737-1588КузнецовП. С.KuznetsovP. S.

КУЗНЕЦОВ Павел Сергеевич

185030, Республика Карелия, г. Петрозаводск, пр. Александра Невского, 50

185030, Aleksander Nevsky st., 50 Petrozavodsk, Republic of Karelia

kuznetsov.pavel04200@gmail.comhttps://orcid.org/0000-0002-3330-6861НовиковаЮ. С.NovikovaJ. S.

НОВИКОВА Юлия Сергеевна

185030, Республика Карелия, г. Петрозаводск, пр. Александра Невского, 50

185030, Aleksander Nevsky st., 50 Petrozavodsk, Republic of Karelia

NovYuliana@gmail.comhttps://orcid.org/0000-0003-2726-0104ЗдоровенноваГ. Э.ZdorovennovaG. E.

ЗДОРОВЕННОВА Галина Эдуардовна

РИНЦ Author ID: 184542, Scopus Author ID: 8847365700, WoS ResearcherID: L-8214–2013

185030, Республика Карелия, г. Петрозаводск, пр. Александра Невского, 50

185030, Aleksander Nevsky st., 50 Petrozavodsk, Republic of Karelia

zdorovennova@gmail.comИнститут водных проблем Севера Карельского научного центра РАНРоссияNorthern Water Problems Institute of the Karelian Research Centre of RASRussian Federation2023260720231627388Copyright © Богданов С.Р., Пальшин Н.И., Здоровеннов Р.Э., Митрохов А.В., Кузнецов П.С., Новикова Ю.С., Здоровеннова Г.Э., 20232023Богданов С.Р., Пальшин Н.И., Здоровеннов Р.Э., Митрохов А.В., Кузнецов П.С., Новикова Ю.С., Здоровеннова Г.Э.Bogdanov S.R., Palshin N.I., Zdorovennov R.E., Mitrokhov A.V., Kuznetsov P.S., Novikova J.S., Zdorovennova G.E.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://hydrophysics.spbrc.ru/jour/article/view/1216

Представлены результаты изучения перемешивания водной массы небольшого лесного димиктического озера на этапе летнего нагревания. Ветровое воздействие ограничено малой площадью зеркала (80–110 на 400 м) и залесенностью берегов, поэтому летом превалирует конвективный механизм перемешивания при охлаждении поверхности озера в ночные часы. Оценка эффективности перемешивания η осуществлялась интегральным энергетическим методом, на основе вычислений потока плавучести и изменения базовой потенциальной энергии по трансформации температурного профиля. Для этой цели использовалась температурная коса с 13 высокочувствительными датчиками; измерения проводились в середине лета 2022 г. в течение 35 дней с дискретностью в одну минуту. По данным акустических профилографов рассчитана скорость диссипации энергии, что позволило произвести альтернативную оценку эффективности перемешивания. Для величины η получена оценка ~0,4, которая существенно превышает «каноническое» значение 0,17 для случая ветрового перемешивания.

 

 

 

 

The paper presents the results of studying the mixing of the water mass of a small forest dimictic lake at the stage of summer heating. The wind effect is limited by the small area of the mirror (the size of the lake is 80–110 by 400 m) and the forested shores, so in summer the convective mixing mechanism prevails when the lake surface cools at night. Evaluation of the mixing efficiency η was carried out by the integral energy method, based on the calculations of energy pumping and changes in the background potential energy according to the temperature profile transformation. For this purpose, a chain with 13 highly sensitive temperature sensors was used; the measurements were carried out in the middle of summer 2022 for 35 days with a time interval of one minute. Acoustic current profiler’s data were used to estimate turbulent velocity fluctuations and calculate the energy dissipation rate, which made it possible to make an alternative assessment of the mixing efficiency. The value of η ~0,4 was obtained, which significantly exceeds the “canonical” value of 0,17 for the case of wind mixing.

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The authors declare that there are no conflicts of interest present.