Effects of thermal inertia and the thermally active layer of a small lake
https://doi.org/10.59887/2073-6673.2025.18(4)-5
EDN: JHTCVW
Abstract
The dynamics and structure of the epilimnion largely determine the features of heat balance, gas emissions, turbulent mass transfer, chemical and biological processes occurring in the lake during the period of open water. This structure is formed under the influence of various external factors, which, as a rule, are periodic in nature. The response of the water column to such impacts occurs with some delay, and in some cases the thermal inertia of the water column leads to the occurrence of hysteresis effects. Along with seasonal and synoptic factors, external influences characterized by a daily period play an important role, in particular, night-time surface cooling and daily fluctuations in air temperature.
Using a thermocouple with highly sensitive sensors, an analysis of the temperature response at different depths to such influences was carried out. This response can, to a first approximation, be characterized as a temperature wave, the calculation of the parameters of which allows us to estimate the thickness of the thermally active layer, as well as the coefficient of turbulent diffusion. One of the advantages of this method is that these assessments can be carried out using a minimum number of temperature sensors.
Keywords
epilimnion,
turbulent diffusion,
thermal inertia,
temperature wave,
thermally active layer,
small lake,
thermal structure
Supporting agencies: This study was carried out within the framework of the State task (FMEN 2021-0019) of the Northern water problems Institute, Karelian Research Center of the Russian Academy of Sciences.
About the Authors
S. R. Bogdanov
Northern Water Problems Institute of the Karelian Research Centre of the Russian Academy of Sciences
Russian Federation
Russian Federation
WoS ResearcherID: Y-5047-2019, Scopus AuthorID: 22950031500
50 A. Nevsky Prosp., Petrozavodsk, 185030
N. I. Palshin
Northern Water Problems Institute of the Karelian Research Centre of the Russian Academy of Sciences
Russian Federation
Russian Federation
WoS ResearcherID: L-8634-2013, Scopus AuthorID: 67001733667
50 A. Nevsky Prosp., Petrozavodsk, 185030
T. V. Efremova
Northern Water Problems Institute of the Karelian Research Centre of the Russian Academy of Sciences
Russian Federation
Russian Federation
WoS ResearcherID: M-1943-2013, Scopus AuthorID: 7006375780
50 A. Nevsky Prosp., Petrozavodsk, 185030
G. E. Zdorovennova
Northern Water Problems Institute of the Karelian Research Centre of the Russian Academy of Sciences
Russian Federation
Russian Federation
WoS ResearcherID: L-8294-2013, Scopus AuthorID: 8847365600
50 A. Nevsky Prosp., Petrozavodsk, 185030
R. E. Zdorovennov
Northern Water Problems Institute of the Karelian Research Centre of the Russian Academy of Sciences
Russian Federation
Russian Federation
WoS ResearcherID: L-8214-2013, Scopus AuthorID: 8847365700
50 A. Nevsky Prosp., Petrozavodsk, 185030
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Review
For citations:
Bogdanov S.R., Palshin N.I., Efremova T.V., Zdorovennova G.E., Zdorovennov R.E. Effects of thermal inertia and the thermally active layer of a small lake. Fundamental and Applied Hydrophysics. 2025;18(4):66-79. (In Russ.) https://doi.org/10.59887/2073-6673.2025.18(4)-5. EDN: JHTCVW
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