TY - JOUR
T1 - Debris flows with pore pressure and intergranular friction on rugged topography
AU - Heß, Julian
AU - Tai, Yih Chin
AU - Wang, Yongqi
N1 - Funding Information:
The authors want to acknowledge the financial support of the Deutsche Forschungsgemeinschaft (DFG) for this work within the project number WA 2610/3-1, and Y.C. Tai would like to thank the Ministry of Science and Technology, Taiwan, for the financial support (Project: MOST 107-2221-E-006-032).
Funding Information:
The authors want to acknowledge the financial support of the Deutsche Forschungsgemeinschaft (DFG) for this work within the project number WA 2610/3-1 , and Y.C. Tai would like to thank the Ministry of Science and Technology, Taiwan , for the financial support (Project: MOST 107-2221-E-006-032 ).
Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2019/8/15
Y1 - 2019/8/15
N2 - The dynamic behavior of debris flows features the interplay of a non-hydrostatic pore-fluid pressure with the non-linear deformational behavior of the granular skeleton and the internal contact stress between grains. This complex physical background is considered by amending the classical depth-integrated modeling for granular-fluid flows by two additional fields, an extra pore-fluid pressure and a hypoplastic intergranular stress. A scaled and depth-integrated model is developed and transferred into a system of terrain-following coordinates, enabling the application on rugged topography. With this model, numerical investigations are carried out, using a non-oscillatory, shock-capturing central-upwind scheme. Parameter studies show the general impact of the additional fields, completed by comparison to the experimental results of a dam break scenario. Furthermore, application to the landslide event at the village of Hsiaolin in Taiwan, 2009, show the capability of the model to cope with large scale scenarios. The results show that the model and its implementation provide insights in the flow dynamics and the possibility to application on complex topography, considering an enhanced approach to the physics of debris flows.
AB - The dynamic behavior of debris flows features the interplay of a non-hydrostatic pore-fluid pressure with the non-linear deformational behavior of the granular skeleton and the internal contact stress between grains. This complex physical background is considered by amending the classical depth-integrated modeling for granular-fluid flows by two additional fields, an extra pore-fluid pressure and a hypoplastic intergranular stress. A scaled and depth-integrated model is developed and transferred into a system of terrain-following coordinates, enabling the application on rugged topography. With this model, numerical investigations are carried out, using a non-oscillatory, shock-capturing central-upwind scheme. Parameter studies show the general impact of the additional fields, completed by comparison to the experimental results of a dam break scenario. Furthermore, application to the landslide event at the village of Hsiaolin in Taiwan, 2009, show the capability of the model to cope with large scale scenarios. The results show that the model and its implementation provide insights in the flow dynamics and the possibility to application on complex topography, considering an enhanced approach to the physics of debris flows.
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U2 - 10.1016/j.compfluid.2019.06.015
DO - 10.1016/j.compfluid.2019.06.015
M3 - Article
AN - SCOPUS:85067496809
VL - 190
SP - 139
EP - 155
JO - Computers and Fluids
JF - Computers and Fluids
SN - 0045-7930
ER -