サイクリックステップの発生に伴う粒度偏析(河川・湖沼・沿岸環境(2),一般講演)

概要

論文の詳細を見る
Cyclic steps are spatially periodic bedforms where each wavelength is delineated by an upstream and downstream hydraulic jump. They migrate upstream keeping the same wavelength. Recently cyclic steps have been reported from various environments, and in various bed materials. In spite of this universal existence of cyclic steps, sediment transport processes through the cyclic steps have not yet been examined enough experimentally. In this study, cyclic steps were developed in the mixed-grain-size sediments, i.e., D_<50> are 0.2mm and 0.06mm respectively, and the resultant grain size distributions were examined. The grain size distributions can be divided into 4 groups, i.e., (a) bimodal 1 (fine grains dominated), (b) bimodal 2 (coarse grains dominated), (c) uni-modal 1 (fine grains dominated), and (d) uni-modal 2 (coarse grains dominated). These groups are arranged to result in the upward and downstream-fining trends.
日本流体力学会の論文
2010-09-09