Author(s): Toyokatsu Yuuki; Takeshi Okabe
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Abstract: Influences of vegetation developed on alternating bars upon their hydrogeomorphic processes are investigated based on the results of flume experiments performed by the authors. Construction of each experimental run consists of two stages; firstly, alternating bars are generated in the flume, secondly, vegetation models are planted on the bars, and the subsequent hydrogeomorphic process is observed. Four patterns of vegetation planting are examined. It is confirmed that the bars cease advancement or fixed in the cases of high vegetation density. Fixed bars increase their height either due to degradation in the low-stream region or aggradation in the region of vegetation. Some results of numerical simulations of flows on alternating bars with and without vegetation are presented with reference to the discussion made on the mechanisms of this kind of hydrogeomorphic processes.
Year: 1997