Secondary branching of many-channeled stream and mechanism of its formation

Abstract

The paper introduces a technique of flow pattern calculation for the case of many channeled stream based on calculation of discharge distribution between the branches, the «frag1nents» method being applied to individual branches, The calculation was made for the case of the channel-forming discharge. The analysis of flow pattern of the middle reaches of the Lena River constructed on the basis of the suggested technique allowed to investigate the secondary branching of the main channel and to find the cause of new islands formation. Main flow circulation schemes in a wide channel are given which accounts for secondary branching of main channels.