2025 Volume 81 Issue 16 Article ID: 24-16143
Flows containing fine sediment such as wash roads occur not only in high-sand rivers such as the Yellow River, but also as mudflows and debris flows that occur as landslide disasters during heavy rains. It is important to understand the flow characteristics of such high-concentration sediment flow in order to know the actual flood behavior and the impact on bridge piers, houses, etc. In this study, high-concentration sediment flow was reproduced in an open channel with columnar objects of various shapes using polymeric agents to experimentally investigate the differences in flow structure and shape resistance characteristics between a highly viscous flow corresponding to a sediment concentration of 7% by volume and a fresh water flow. As a result, it was clarified that the scale of detouring flow and wake vortex generated around a columnar object is suppressed in a highly viscous fluid compared to that in a fresh water flow. In addition, the relationship between the resistance coefficients of each shape and the shape resistance characteristics of highly viscous fluid was clarified.
