Ridge relief of the river channel and its impact on seasonal deformations of shallows

Abstract

Seasonal deformations of the shallows in the Chulym channel within the segment under study depend on the regime of movement of sandy and sandy-gravel ridges, the height of the ridges – 0.2 to 0.4 m - controls amplitudes of the shallows' crest fluctuations. Ridges of that order exist under velocities (averaged over the stream cross-section) from 0.4 m/s (the 1st threshold velocity) to 0.6 m/s (the 2nd threshold velocity).

The shallows are subdivided into three groups on the basis of average flow velocity (at different discharges) as related to the 2nd threshold velocity; the groups differ in the character of seasonal deformations of the channel.