Debris flows with pore pressure and intergranular friction on rugged topography

Julian Heß, Yih-Chin Tai, Yongqi Wang

Research output: Contribution to journalArticle

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 languageEnglish
Pages (from-to)139-155
Number of pages17
JournalComputers and Fluids
Volume190
DOIs
Publication statusPublished - 2019 Aug 15

Fingerprint

Pore pressure
Debris
Topography
Friction
Fluids
Landslides
Dams
Flow of fluids
Physics

All Science Journal Classification (ASJC) codes

  • Computer Science(all)
  • Engineering(all)

Cite this

@article{fb9c6e6e96b741278c3b051e0afbea9a,
title = "Debris flows with pore pressure and intergranular friction on rugged topography",
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.",
author = "Julian He{\ss} and Yih-Chin Tai and Yongqi Wang",
year = "2019",
month = "8",
day = "15",
doi = "10.1016/j.compfluid.2019.06.015",
language = "English",
volume = "190",
pages = "139--155",
journal = "Computers and Fluids",
issn = "0045-7930",
publisher = "Elsevier Limited",

}

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 journalArticle

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.

UR - http://www.scopus.com/inward/record.url?scp=85067496809&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85067496809&partnerID=8YFLogxK

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 -