A234 巨礫散在河道における砂州の形成(A-23 河川における移動床流れ(3),一般講演)

概要

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The river environments have been changed because of recent human impacts. In order to clarify the transformation of physical environment in river, we need more information on transformation process of bar, which is representative river morphology. In mountainous rivers, bar formation is degenerated by the existence of cobbles. In streams with sparsely distributed cobbles as observed in mountainous rivers, we rarely observe appreciable bars. In order to explain the fact that bars rarely appear in such a stream, the flume experiments and numerical simulations have been conducted. We could see that comparatively dense distribution of the surface cobbles disturbs bar formation because the cobbles distort the flow direction in both the numerical simulation and experiments. We showed the condition that no bars appear depends on the number density and the diameter of cobbles.
日本流体力学会の論文
2004-08-09