Spectral Water Transparency of Novosibirsk Reservoir in Summer 2017
The results of measurement of the spectral attenuation coefficient of water at different depths and at wavelength 400–800 nm carried out at the Novosibirsk reservoir during August 14–18, 2017 are presented. The route of water sampling along the reservoir measured 200 km in length and consisted of ten sections from the town of Kamen-na-Obi to the dam area of hydropower station and the Berdsk Gulf. The hydrooptical measurements involved the evaluation of the depth of Secchi disk visibility. It is found that the largest spectral attenuation coefficient of water at wavelength 400–800 nm for the surface layer in the upper part of the reservoir reached 30 m-1. This is due to the high average flow rate reaching 1–15 m/s, shallow depth, turbulent mixing of water masses that leads to the increase of the concentration of suspensions and dissolved substances in water. In the middle part of the reservoir, where the average flow rate in the surface layer is reduced to 0.3–0.5 m/s, the highest spectral attenuation of water is observed at 8 m-1. At the bottom and dam parts of the reservoir, where the average flow rate is 0.11-0.20 m/s, the spectral attenuation of water does not exceed 6 m-1. The two sites of the Berdsk Gulf show the maximum spectral attenuation at 5.5–8 m-1. In general, the results of field investigations quantify the variations in the spectral attenuation of summer water at different depths for 10 sites of the three main parts of the Novosibirsk reservoir and the Berdsk Gulf. The obtained data provide a basis for the modeling of hydrophysical processes and the integrated assessment of the ecological state of the water body under study.
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