KEYWORDS: Ice, Attenuation, Air temperature, Temperature metrology, Transparency, Time metrology, Spectrophotometry, Meteorology, Biological samples, Water quality
The spectral index of light attenuation (SILA) by water of natural reservoirs is a sensitive indicator reacting to the content of suspensions and dissolved absorbing substances in water, which to a certain extent can serve as a characteristic of ongoing biotic and abiotic processes. The results of expedition measurements of SILA in the range of 400-800 nm at different depths in the lake-like part of the Novosibirsk reservoir during the period of snow and ice cover and open water are presented. Quantitative data on changes in the SILA at different depths for several stations in the research area are discussed.
KEYWORDS: Signal attenuation, Transparency, Temperature metrology, Pollution, Calibration, Visibility, Time metrology, Temperature sensors, Spectrophotometry, Sensors
After carrying out bottom cleaning works on a part of Lake Manzherokskoye in 2017-2018, the quality of lake water did not significantly improve, and its transparency even significantly decreased. As our studies have shown, the reasons lay in the fact that after the bottom cleaning works, powerful bottom springs were opened, which began to intensively erode the remaining silt layer. To assess the geoecological state of the lake during the period of freeze-up and summer warming up, expeditionary hydrophysical studies of such parameters as horizontal and vertical velocities of water movement, integral and spectral transparency, temperature from surface to bottom were carried out. The results of these studies are presented in this article.
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