Impact of Snowmelt Conditions on the Isotopic Composition of the Surface Waters of the Upper Ob River during the Flood Period

For many of the Siberian rivers, and Upper Ob in particular, 70–80% volume annual water runoff is formed during spring flood. Thus, factors influencing formation flood are paramount. We explain changes isotopic composition surface waters by changing different components’ contribution to discharge over period. suggest estimating time meltwater flow from watershed outlet section using difference between date complete melting snow cover catchment area maximum light isotope section. show that a sharp short-term weighting river at end first phase may be associated with influx autumn soil moisture, displaced soils snowmelt waters.