河床の上昇・低下を伴う砂州の線形安定解析(移動境界・移動床,一般講演)

概要

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The effects of river bed aggradation and degradation on bar instability is analytically studied in terms of linear stability analysis. Weakly non-equilibrium processes are taken into account by the use of the WKBJ method. In the analysis, aggradation or degradation is assumed to be sufficiently slow compared with the bed evolution due to instability, and its non-dimensional speed is used as a small parameter. It is found that river beds become stable and sand bars tend not to be formed under degradation, and that river beds become unstable under aggradation.
2010-09-09