New bedform phase diagram for combined flow, aiming for the accurate interpretation of sedimentary structures.

点击翻译按钮获取中文摘要

We newly performed a series of flume-experiments to investigate the relationship between hydraulic conditions and bedform morphology and internal sedimentary structures generated by combined flow, i.e., combined waves and currents, with 4-sec and 6-sec oscillation periods. The results were compiled with previous experimental results, and we found that there is dependence on oscillation periods and grain size in changing morphology of bedforms. In addition, PIV analyses were conducted to investigate the characteristic water movement and distribution of the vorticity around the combined-flow ripples.