Author(s): Yi Xiao; Shengfa Yang; Xuejun Shao
Linked Author(s): Shengfa Yang
Keywords: Fluvial processes; Transformation of channel patterns; Control factors; 2-D numerical model
Abstract: This paper investigates the controls on the transformation mechanism among different channel patterns. A 2D depth-averaged numerical model is applied to produce the evolutions of channel pattern with complex interaction among water flow, sediment transport, and bank erosion. Variables as discharge, sediment supply, and vegetation are taken account in the numerical experiment, leading to changes from braided pattern to another one. What controls the transformation is discussed with the numerical results: Vegetation helps stabilize cut bank and bar surface, but not a key in the transition; a decrease in discharge and sediment supply could make a braided pattern to a meandering one. The conclusion is in agreement with the previous field work, confirming the two dimensional model’s potential in predicting the transition between different rivers and improving understanding of patterning processes.
Year: 2013