setisi 2015
TRANSCRIPT
Numerical Simulation of Debris Avalanche Problems
Sudi MungkasiDepartment of Mathematics,
Sanata Dharma University, YogyakartaEmail: [email protected]
Outline of presentation
• Introduction of the problem• Method to solve the problem• Research results• Conclusion
Introduction: Motivation
Flood at bundaran air mancur near Patung Arjuna Wiwaha Jalan MH Thamrin Jakarta Monday 9/2/2015 Source: http://megapolitan.kompas.com/read/2015/02/09/22452411/FOTO.Ibu.Kota.yang.Pasti.Tenggelam
Introduction: Motivation
Landslide in Sukabumi in March 2015. At least 12 people died. http://news.okezone.com/read/2015/03/29/340/1126082/longsor-di-sukabumi-12-
orang-dilaporkan-tewas
Introduction: Goal
• Our goal is to promote doing a numerical simulation of disasters before they occur.
• In this work, we focus on avalanche problems, such as landslides, debris avalanche, snow avalanche, etc.
• We will use ANUGA software to do simulations and assess its performance.
Outline of presentation
• Introduction of the problem• Method to solve the problem• Research results• Conclusion
Method
• The shallow water equations to model water flows are in the following form:
where q is the quantity vector, f and g are the flux vectors, and s is the source.
Numerical Method: Finite Volume Method for 1 Dimension
Numerical Method: Finite Volume Method for 1 Dimension
Numerical Method: Finite Volume Method for 2 Dimensions
Numerical Method: Finite Volume Method for 2 Dimensions
Metode volume hingga untuk dua dimensi dengan diskritisasi segitiga mempunyai skema:
atau
Numerical Method
• Finite volume method with triangular grids is used to solve the shallow water equations:
• This method has been programmed in ANUGA package. ANUGA is a free and open source software developed by Australian National University (ANU) and Geoscience Australia (GA).
Outline of presentation
• Introduction of the problem• Method to solve the problem• Research results• Conclusion
Example of ANUGA simulation
ANUGA tsunami simulation for Wollongong east coast by SG Roberts
Wet/dry avalanche
Avalanche problems: initial condition
Wet/wet avalanche
Avalanche problems: numerical results
Wet/dry avalanche Wet/wet avalanche
Avalanche problems: numerical results
Wet/dry avalanche Wet/wet avalanche
Conclusion
• We have tested the performance of ANUGA software to solve debris avalanche problems.
• It is also robust, as it can deal with dry areas and shock waves with relatively coarse discretization of the topography.
• For future research direction, case studies can be conducted, such as snow avalanche and landslide.
References• A. Mangeney, P. Heinrich, & R. Roche, "Analytical solution for testing debris avalanche
numerical models," Pure and Applied Geophysics, vol. 157, pp. 1081-1096, 2000.• S. Mungkasi & S. G. Roberts, "A new analytical solution for testing debris avalanche numerical
models," ANZIAM Journal, vol. 52, pp. C349-C363, 2011.• S. Mungkasi & S. G. Roberts, "Analytical solutions involving shock waves for testing debris
avalanche numerical models," Pure and Applied Geophysics, vol. 169, pp. 1847-1858, 2012.• M. Naaim, S. Vial, & R. Couture, "Saint Venant approach for rock avalanches modelling," In
Proc. Saint Venant Symposium: Multiple Scale Analyses and Coupled Physical Systems, Presses de l'Ecole Nationale des Ponts et Chausees Paris (1997), pp. 61-69.
• A. Ritter, "Die fortpflanzung der wasserwellen," Zeitschrift des Vereines Deutscher Ingenieure, vol. 36, pp. 947-954, 1892.
• S. Roberts, O. Nielsen, D. Gray, & J. Sexton, ANUGA User Manual, Canberra: Commonwealth of Australia (Geoscience Australia) and The Australian National University, 2010.
• J. J. Stoker, Water Waves: The Mathematical Theory with Applications, New York: Interscience, 1957.
Thank you