Результаты оценки эффективности донной плотины, построенной для повышения минимальных зимних уровней на реке Сухоне и озере Кубенском

Lake Kubenskoye is one of the largest lakes in the Vologda region, has long been an object of various economic uses, including a source of water supply for the city of Vologda. Sometimes it is classified as a reservoir of seasonal regulation, since for the needs of navigation on the Sukhona River, since 1827, a hydroelectric complex with a lock chamber and a retaining dam was built 7 km from its source.

In 2011, a blind bottom dam was built 300 m above the Znamenity lockin accordance with the project “Increasing the winter level of the Kubensky reservoir to ensure the operation of the Vologda city water intake”.

This is due to the fact that during the winter low-water period, water intake from the lake should serve as a guarantor of uninterrupted water supply to the city of Vologda. When an extremely low winter low water is formed, an emergency situation arises, because due to low levels in the supply channel, the pumping station stops its work. At the same time, wintering conditions for commercial fish in Lake Kubenskoye are critically deteriorating. In essence, a dangerous hydroecological phenomenon is being formed.

The results of a study of the minimum winter levels on the Upper Sukhona and Lake Kubenskoye, which are in the backwater regime after the construction of a bottom backwater dam, are obtained. Field and office work were carried out, as well as an assessment of the minimum winter levels of design probabilities. The insufficiency of the regulating effect of the bottom dam and the preservation of the indicated dangerous hydroecological phenomenon are shown.