A Physics-Based Emulator for the Simulation of Geophysical Mass Flows

2015 ◽  
Vol 3 (1) ◽  
pp. 562-585
Author(s):  
Asif Mahmood ◽  
Robert L. Wolpert ◽  
E. Bruce Pitman
Keyword(s):  
Mass Flows ◽  
Geophysical Mass Flows

A two-fluid model for avalanche and debris flows

2005 ◽  
Vol 363 (1832) ◽  
pp. 1573-1601 ◽  
Author(s):  
E. Bruce Pitman ◽  
Long Le
Keyword(s):  
Debris Flows ◽  
Fluid Model ◽  
Solid Material ◽  
Fluid Inertia ◽  
Two Phase ◽  
Engineering Research ◽  
Mass Flows ◽  
Two Fluid Model ◽  
Two Fluid ◽  
Geophysical Mass Flows

Geophysical mass flows—debris flows, avalanches, landslides—can contain O (10 6 –10 10 ) m 3 or more of material, often a mixture of soil and rocks with a significant quantity of interstitial fluid. These flows can be tens of meters in depth and hundreds of meters in length. The range of scales and the rheology of this mixture presents significant modelling and computational challenges. This paper describes a depth-averaged ‘thin layer’ model of geophysical mass flows containing a mixture of solid material and fluid. The model is derived from a ‘two-phase’ or ‘two-fluid’ system of equations commonly used in engineering research. Phenomenological modelling and depth averaging combine to yield a tractable set of equations, a hyperbolic system that describes the motion of the two constituent phases. If the fluid inertia is small, a reduced model system that is easier to solve may be derived.

scholarly journals r.avaflow & r.randomwalk: two complementary and comprehensive open source GIS simulation tools for the propagation of rapid geophysical mass flows

2016 ◽  
Author(s):  
Martin Mergili ◽  
Matthias Benedikt ◽  
Julia Krenn ◽  
Jan-Thomas Fischer ◽  
Shiva P Pudasaini
Keyword(s):  
Open Source ◽  
Open Source Software ◽  
Flow Model ◽  
Rock Avalanche ◽  
Two Phase ◽  
Simulation Tools ◽  
Physically Based ◽  
Open Source Gis ◽  
Mass Flows ◽  
Geophysical Mass Flows

We present two GIS model applications for simulating the propagation of rapid geophysical mass flows: r.avaflow employs an advanced physically-based two phase flow model intended for in-detail case studies, r.randomwalk a conceptual model suitable for studies at various scales. Both tools are implemented in open source software environments serving for the needs of both research and practice. They offer a range of visualization, validation, parameter sensitivity analysis and parameter optimization functions. Some of the key functionalities of both tools are demonstrated for the Acheron rock avalanche in New Zealand.

scholarly journals r.avaflow & r.randomwalk: two complementary and comprehensive open source GIS simulation tools for the propagation of rapid geophysical mass flows

2016 ◽  
Author(s):  
Martin Mergili ◽  
Matthias Benedikt ◽  
Julia Krenn ◽  
Jan-Thomas Fischer ◽  
Shiva P Pudasaini
Keyword(s):  
Open Source ◽  
Open Source Software ◽  
Flow Model ◽  
Rock Avalanche ◽  
Two Phase ◽  
Simulation Tools ◽  
Physically Based ◽  
Open Source Gis ◽  
Mass Flows ◽  
Geophysical Mass Flows

We present two GIS model applications for simulating the propagation of rapid geophysical mass flows: r.avaflow employs an advanced physically-based two phase flow model intended for in-detail case studies, r.randomwalk a conceptual model suitable for studies at various scales. Both tools are implemented in open source software environments serving for the needs of both research and practice. They offer a range of visualization, validation, parameter sensitivity analysis and parameter optimization functions. Some of the key functionalities of both tools are demonstrated for the Acheron rock avalanche in New Zealand.

scholarly journals TITAN2F: a pseudo-3-D model of 2-phase debris flows

2015 ◽  
Vol 3 (6) ◽  
pp. 3789-3822 ◽  
Author(s):  
G. Córdoba ◽  
M. F. Sheridan ◽  
E. B. Pitman
Keyword(s):  
Debris Flows ◽  
Volume Fraction ◽  
Dynamic Pressure ◽  
Solid Volume Fraction ◽  
Solid Material ◽  
Fluid Forces ◽  
Interaction Terms ◽  
Wide Range ◽  
Mass Flows ◽  
Geophysical Mass Flows

Abstract. Debris flows, avalanches, landslides, and other geophysical mass flows can contain O(106–1010) m3 or more of material. These flows commonly consist of mixture of soil and rocks with a significant quantity of interstitial fluid. They can be tens of meters deep, and their runouts can extend many kilometers. The complicated rheology of such a mixture challenges every constitutive model that can reasonably be applied; the range of length and timescales involved in such mass flows challenges the computational capabilities of existing systems.This paper extends recent efforts to develop a depth averaged "thin layer" model for geophysical mass flows that contain a mixture of solid material and fluid. Concepts from the engineering community are integrated with phenomenological findings in geo-science, resulting in a theory that accounts for the principal solid and fluid forces as well as interactions between the phases, across a wide range of solid volume fraction. A principal contribution here is to present drag and phase interaction terms that comport with the literature in geo-sciences. The program predicts the evolution of the concentration and dynamic pressure. The theory is validated with with data from one dimensional dam break solutions and it is verified with data from artificial channel experiments.

scholarly journals r.avaflow & r.randomwalk: two complementary and comprehensive open source GIS simulation tools for the propagation of rapid geophysical mass flows

2016 ◽  
Author(s):  
Martin Mergili ◽  
Matthias Benedikt ◽  
Julia Krenn ◽  
Jan-Thomas Fischer ◽  
Shiva P Pudasaini
Keyword(s):  
Open Source ◽  
Open Source Software ◽  
Flow Model ◽  
Rock Avalanche ◽  
Two Phase ◽  
Simulation Tools ◽  
Physically Based ◽  
Open Source Gis ◽  
Mass Flows ◽  
Geophysical Mass Flows

We present two GIS model applications for simulating the propagation of rapid geophysical mass flows: r.avaflow employs an advanced physically-based two phase flow model intended for in-detail case studies, r.randomwalk a conceptual model suitable for studies at various scales. Both tools are implemented in open source software environments serving for the needs of both research and practice. They offer a range of visualization, validation, parameter sensitivity analysis and parameter optimization functions. Some of the key functionalities of both tools are demonstrated for the Acheron rock avalanche in New Zealand.

scholarly journals Grain-size segregation and levee formation in geophysical mass flows

2012 ◽  
Vol 117 (F1) ◽  
pp. n/a-n/a ◽  
Author(s):  
C. G. Johnson ◽  
B. P. Kokelaar ◽  
R. M. Iverson ◽  
M. Logan ◽  
R. G. LaHusen ◽  
...  
Keyword(s):  
Grain Size ◽  
Size Segregation ◽  
Mass Flows ◽  
Geophysical Mass Flows
Sign in / Sign up

Export Citation Format

Share Document