TY JOUR TI JUSTIFICATION OF SAFE TECHNOLOGY FOR THE EXPLOITATION OF MOUNTAIN RIVER RESOURCES KW floodplains of mountain rivers KW gully formation KW emergencies KW debris accumulation zone KW solid flow content KW gravel-boulder component KW solid filtration zone JO Problems of risk management in the technosphere AU Karpova, Z.V. AU Yakheev, V.V. AU Akterskiy, Y.E. PY 2026 IS 2026 PB Saint-Petersburg University of State Fire Service of Emercom of Russia