TY JOUR TI Building Digital Model of Riverbed Pur in Upper Reaches to Ensure Technosphere Safety on Inland Waterways KW Technosphere safety KW inland waterways KW digital model of riverbed KW water regime KW river Pur JO Proceedings of Petersburg Transport University AU Sanockaya, N.A. AU Belikov, I.A. PY 2022 IS 19 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"