Hydrological site transverse profiles and their bottom line (1), measured SSC (2), isolines of equal SSC (3), based on SSC echograms, and surface water temperature curve (4). Transverse profiles: a -Main channel (L-9), б -Tumatskaya branch (L-3), в -Bulkurskaya branch (L-12), г -Olenekskaya branch (L-13), д -Arynskaya branch (L-16), e -Tumatskaya branch (L-22)