Recent channel alluvium and its distribution according channel types - a case study of the Lower Vilyui

Abstract

Channel-forming deposits composition and distribution at the lower Vilyui River are controlled by geological and hydrological factors, mostly by local supply of material from eroded terraces scarps and by dynamical properties of -the stream. Though both composition and size of the channel alluvium reflect channel-forming discharge, channel alluvium at the lower reaches of the Vilyui indicates noticeable re-distribution taking place during high water in summer. Channel alluvium distribution according to channel types reveals certain regular-ties: particles size increases along with the stream's concentration, larger size is characteristic of zones of the stream acceleration; smallest particles are deposited within zones of deceleration.