土砂動態観測に基づいた交互砂州の形状・土砂移動特性と川幅水深比によるその違い

抄録

This study aims to clarify the relationships between the sediment load on the alternative bar and width- depth ratio of the bar. Four alternative bars in the Asa and Tone rivers were selected as field measurement sites. In each sites, several sticks and metal rings were installed to observe sediment load. In addition, 35 alternative bars from 7 rivers are investigated to check the relationships between bar morphology and width- depth ratio. As a result, at the area where dense vegetation are grown, the sediment load were less active. Thus, the width that determine the characteristics of alternative bar should be bare land and water surface areas. The width-depth ratio with bare land and water surface areas can represent the characteristics of sediment load on the bar and its shape, which was also confirmed by the two cases of experiments.