日本地球惑星科学連合2019年大会

講演情報

[E] 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] 地すべりおよび関連現象

2019年5月28日(火) 15:30 〜 17:00 ポスター会場 (幕張メッセ国際展示場 8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-P09] A depth-integrated model for granular flows on the transition of different bed conditions

*Ling-Yi Hsu1Chi-Yao Hung1 (1.National Chung Hsing University)

The different basal boundary conditions profoundly affected the flow behavior of debris flow. However, it is hard to have a general and straightforward model to describe the flow profile switching from different bed conditions. In this study, we purpose a new depth-averaged model to simulate the dense granular flow transition between the rigid and mobile bed. The model is based on mass conservation, momentum conservation, and kinetic energy conservation. We apply the linearized mu(I) rheology to describe granular deformation and assume Coulomb friction along the sidewalls. By incorporating the basal shear rate term into the equations, the theory can balance the extra force from rigid bed friction force. To check the model approach, we conducted an equilibrium and non-equilibrium heap flow experiments using the narrow see-saw channel, which can be tilted to different angles between runs or during flows. To compare the experimental results with the theory, the flow fields are monitored using high-speed video and particle-tracking velocimetry.