Analysis of the possible consequences of large-scale production of sand and gravel mixture in the downstream of large hydroelectric facilities based on hydrodynamic modeling (the V... by Anatoliy V. Lepikhin, Yuri S. Lyakhin, Alexey A. Tiunov, Anna A. Wozniak, Anton I. Luchnikov, Dmitiy V. Perepelitsa, Andrey V. Bogomolov