CHANNEL FORMATION UNDER LOW DISCHARGE ON BARS CREATED UNDER HIGH DISCHARGE AND FORMATION OF VALLEY FLATS

Abstract

Since channel shapes change to accommodate water discharge, complicated river terrains are formed as a summation of the morphological processes with flow fluctuations. Flood stream behavior, which occurs frequently and at any location, is a phenomenon dominated by such complicated terrain conditions. When drawing up flood control and disaster mitigation measures, it is necessary to clarify land-forming processes and mechanisms both at flood-flow and low-flow conditions. This research aims to report how the river-bed morphology formed at high flow will change into a meandering channel at low-flow water conduction, using study results in comparison with hydraulic experiments on free meandering.