Evaluation of Water Suspension Effect on Spectral Light Attenuation in Lake Water

535.8:556.5:574.5

  • Olga B. Akulova Institute for Water and Environmental Problems SB RAS, Barnaul, Russia Email: akulova8282@mail.ru
  • Vladimir I. Bukaty Institute for Water and Environmental Problems SB RAS, Barnaul, Russia Email: v.bukaty@mail.ru
  • Konstantin V. Laptev Altai State University, Barnaul, Russia Email: laptevkonstantin2001@mail.ru
  • Konstantin V. Marusin Institute for Water and Environmental Problems SB RAS, Barnaul, Russia Email: kat@iwep.ru
DOI_disc_logo https://doi.org/10.14258/izvasu(2024)4-02
Keywords: optical microscopy method, spectral light attenuation, suspended matter concentration, particle radius, particle size distribution, Junge functi

Abstract

The paper presents the results of experimental data studies of many years on the spectral transparency of lake water (using the example of the surface layer of Lake Krasilovskoye) obtained in various 2012-2023 hydrological seasons. The calculated Napierian values of light attenuation coefficient in the 400-800 nm spectral range vary from 3.5 to 35.0 m-1 during the studied period, and the values of yellow substance absorption coefficients vary from 2.5 to 26.1 m-1. The values of chlorophyll-a concentration over an 11-year period lies within the range of 0.5-55.9 mg/m3, and yellow substance concentration — 4.4-60.1 g/m3. To assess the effect of water suspension on light attenuation, the percentage of its relative spectral contribution is calculated along with the other essential optically active components of lake water, like chlorophyll, yellow substance, and pure water. The spectral contribution of the suspension to the light attenuation at λ=430 nm is within the range of 4.4-71.3 %, 11.7-76.3 % at λ=550 nm, and 0.5-59.5 % at λ=670 nm. The optical microscopy method is used to determine the particle size distribution and number concentration of suspension particles. According to the conducted measurements (2013-2023), the weighted average radius of particles in water samples in the surface layer of the lake varies within the range of 0.5÷2.5 μm, while concentrations vary from 1.0∙106 cm-3 to 26.0∙106 cm-3. Particle size distributions are approximated by the Junge function with determination coefficient values from 0.89 up to 0.99.

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Author Biographies

Olga B. Akulova, Institute for Water and Environmental Problems SB RAS, Barnaul, Russia

Candidate of Sciences in Technology, Researcher at the Laboratory of Hydrology and Geoinformatics

Vladimir I. Bukaty, Institute for Water and Environmental Problems SB RAS, Barnaul, Russia

Doctor of Sciences in Physics and Mathematics, Professor, Chief Researcher at the Laboratory of Hydrology and Geoinformatics

Konstantin V. Laptev, Altai State University, Barnaul, Russia

Master Student of the Department of General and Experimental Physics

Konstantin V. Marusin, Institute for Water and Environmental Problems SB RAS, Barnaul, Russia

Researcher at the Laboratory of Hydrology and Geoinformatics

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Published
2024-10-07
How to Cite
Akulova O. B., Bukaty V. I., Laptev K. V., Marusin K. V. Evaluation of Water Suspension Effect on Spectral Light Attenuation in Lake Water // Izvestiya of Altai State University, 2024, № 4(138). P. 17-26 DOI: 10.14258/izvasu(2024)4-02. URL: https://izvestiya.asu.ru/article/view/%282024%294-02.
Issue
No 4(138) (2024): Известия Алтайского государственного университета
Section
Физика

Copyright (c) 2024 Ольга Борисовна Акулова, Владимир Иванович Букатый, Константин Владимирович Лаптев, Константин Валерьевич Марусин

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