河床高データの解像度と計算格子サイズが河床変動解析に及ぼす影響に関する検討

抄録

Recently, Airborne Laser Bathymetry (ALB) survey that can obtain high-resolution riverbed elevation data including underwater has attracted attention as an alternative technique for cross-sectional survey. In this study, we evaluated the effect of variations of computational mesh size and bed elevation data resolution on the numerical results. As a result, it is clear that the reproducibility for riverbed deformation characteristics can be improved by using finer mesh size, only when ALB data was used. Especially, in order to reproduce the characteristics of riverbed deformation in the curved compound channel, it is necessary to improve the local flow velocity and direction by using a mesh size of 10 m or less.