IDENTIFICATION OF THE CHARACTER AND NATURE OF BYPASS FILTRATION AT HYDRAULIC STRUCTURES IN WESTERN YAKUTIA USING GEOPHYSICAL METHODS
S.A. Velikin1, R.V. Zhang2
1Melnikov Permafrost Institute, Vilyuiskaya Research Permafrost Station, Chernyshevsky, Russia
2Melnikov Permafrost Institute, Yakutsk, Russia
Keywords: cryolithozone, permafrost, engineering and geocryological conditions, filtration, geophysical method, hydraulic unit, hydraulic engineering structure
Abstract
The problem of the development of bypass filtration and static stability of waterworks in the permafrost zone continues to be relevant, especially in the current period of climate change on Earth. In conditions of western Yakutia, the main reason for the loss of filtration stability of hydraulic structures has been identified: the presence of ancient aeration zones in their base; these zones formed during the Holocene optimum and then were frozen under conditions of incomplete water saturation with the formation of ice jams and air cavities. Geophysical methods have been applied to study filtration processes. As a result, we have identified geocryological conditions favoring the development of bypass filtration processes and suggested a set of methods to detect and control them, which is an important challenge of permafrost engineering.
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