2020 Volume 76 Issue 2 Pages I_469-I_480
Alternate bars are regarded as wave phenomenon from its geometrical feature and propagation characteristics. The occurrence condition and development process of alternate bars was made clear in preceding study. However, its propagation which is important feature as wave phenomenon is often unclear. Especially, Alternate bars’s celerity is unclear whether they have spatial distribution and its temporal variation. In this study, in order to confirm the spatial distribution of alternate bars’s celerity and its temporal variation, we conducted firstly flume experiment, and measured the shapes of the water surface and the bottom. Secondly, we have qualified them with combination of measured values and estimation formula. As a result, we clarified that alternate bars ’s celerity has a spatial distribution, and that spatial distribution expands with time.
