JpGU-AGU Joint Meeting 2017

講演情報

[EE] ポスター発表

セッション記号 H (地球人間圏科学) » H-DS 防災地球科学

[H-DS09] [EE] Landslides and related phenomena

2017年5月24日(水) 15:30 〜 17:00 ポスター会場 (国際展示場 7ホール)

コンビーナ:千木良 雅弘(京都大学防災研究所)、王 功輝(京都大学防災研究所)、今泉 文寿(静岡大学農学部)

[HDS09-P06] Granular flow in a varying width rotating drum

*I-Hsuan Wang1Chi-Yao Hung1 (1.National Chung Hsing University)

キーワード:granular flow, rotating drum, three dimensional velocity field, volumetric solid fraction

A landslide is a form of mass move abruptly, and that is prone to be triggered by an earthquake or high intense rainfall. Rapid flows of granular materials on inclined surfaces are often encountered in engineering applications, and also found in geophysical situations.
In this study, we focused on the variation of three-dimensional fluid velocity and the volumetric solid fraction in varying width channel. We have conducted experiments with a 40-cm-diameter grainflow-generating rotating drum designed to simulate simplified landslide. The rotating drum was half filled with 2 mm-diameter grains, which formed a thin grain-avalanching layer. The channel width was varied along the flow direction from 4 cm to 8 cm. The motion of moving particles was recorded by a high-speed camera with 1920x1080 resolution. A parallel laser system was used to reconstruct the position of particles, and particle tracking velocimetry (PTV) method was applied to construct three-dimensional velocity field. Also, by using the same laser system, the volumetric solid fraction was measured. (fig.1). In the end, we verified our results with granular flow theory prediction.