Abstract
paper deals with high ecological risk situation caused by the hydraulic structures state in the Tyrnyauz tailings dam (Gizhgit River valley mouth part), conditions of the water and debris flow discharges passing. Using publications and multi-temporal satellite images analysis authors provide data on the Fundão and Córrego do Feijão (Minas Gerais, Brazil) tailings dam disasters with human losses in 2015 and 2019. Based on this background, it’s described specific features of the situation developing around the Tyrnyauz tailings dam, which has not been functioning since 1997 and contains finely dispersed and toxic products of tungstenmolybdenum ore processing. It’s characterized possible, but not previously taken into account results of the impact of Gizhgit River debris flow and suspended flow on the tailings dam. Analysis of 2002 and 2014 critical situations is conducted. State of hydraulic structures not adapted to the current situation is assessed. It’s noted that there is a high degree of general risk. There are recommendations for preventing an unforeseen but real ecological catastrophe danger. Possibility of dam and banking stability loss during seismic impact is shown. Authors noted that inflow of seepage toxic waters into the Baksan River cannot be allowed. It’s concluded that there is the necessity to develop the comprehensive project for solving the problem and priority measures for its implementation. Authors emphasize the possibility of more significant consequences for the population and infrastructure in the Baksan River valley, downstream the Gizhgit River mouth (Bylym village) in comparison with the Brazilian events of 2015 and 2019.
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