Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 139-155 |
| Number of pages | 17 |
| Journal | Computers and Fluids |
| Volume | 190 |
| DOIs | |
| Publication status | Published - 2019 Aug 15 |
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All Science Journal Classification (ASJC) codes
- Computer Science(all)
- Engineering(all)
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Debris flows with pore pressure and intergranular friction on rugged topography. / Heß, Julian; Tai, Yih-Chin; Wang, Yongqi.
In: Computers and Fluids, Vol. 190, 15.08.2019, p. 139-155.Research output: Contribution to journal › Article
TY - JOUR
T1 - Debris flows with pore pressure and intergranular friction on rugged topography
AU - Heß, Julian
AU - Tai, Yih-Chin
AU - Wang, Yongqi
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
VL - 190
SP - 139
EP - 155
JO - Computers and Fluids
JF - Computers and Fluids
SN - 0045-7930
ER -