網状流路を有する大井川を例とした移動床河道の維持管理に向けた課題と展望

抄録

Physical environment should base on bar morphology which depends on river physical conditions. Complicated river morphology provides variation in hydraulics condition to river eco systems. In the downstream of the Oi River, braided channels give some problems to river management. For example, it is difficult to estimate how channels shift and where bank erosion occur. The characteristics of transformation of braided channels are important for river management because they are concerned with the problems of river management. Therefore, I grasped the change of braided channel after both big and small floods. Consequently, we realize that small flood also let channel shift cross-sectionally. And also I realized that the phenomena that channels frequently move keep riparian vegetation less, and so on. Additionally, in order to improve accuracy of sediment transport analysis, particle size distribution of bed material were investigated with field observation and image analysis.