Cellular automata for modeling and simulating complex phenomena : lahars
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Machado Sotomayor, Guillermo Edvin
Salvatore Di Gregori, Salvatore
Lupiano, Valeria
Leone, Nicola
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Dottorato di Ricerca in Matematica ed Informatica, XXVII Ciclo SSD INF/01a.a. 2015-2016; Lahars represent one of the most destructive natural disasters regarding the loss of human
lives and property damage in their path. Lahars are very complex surface flows of two
types: primary lahars originated directly from eruptive volcanic activity, and secondary lahars
originated in post-eruptive events or quiescent periods.
Lahars are a complex combination of many interrelated processes besides the process of
surface flow: rainwater percolation in the soil (secondary lahars), volcanic stratum erosion,
water inclusion and extrusion in lahar, ice melting and mixing with volcanic emissions
(primary lahars). Evaluating the hazard posed by lahars constitutes a significant challenge
within the framework of modeling and simulation of complex systems for reducing hazard in
many, sometimes very populous, inhabited areas next some dangerous volcanoes.
A variety of approaches has been taken to modeling the behaviors of lahars and the
hazards posed to downstream communities: empirical models based on smart correlations of
phenomenon observables, simple rheological and hydrological models and Partial Differential
Equations (approximating numerical methods of fluid dynamics).
Cellular Automata (CA) represent an alternative approach for modeling and simulating
complex systems evolving on the base of local interactions of their elementary components.
Lahars may be classified as such a type of phenomenon. Moreover, a CA modeling
methodology has been developed for simulating surface flows.
CA are a parallel computational paradigm for modeling complex systems by defining
‘simple’ laws at a local level that generate a global ‘complex’ evolution. The research,
reported in this thesis, adopts a Multicomponent (or Macroscopic) Cellular Automata (MCA)
approach that was applied to other complex surface flows. The model LLUNPIY has been
developed in this frame, and successful simulations of real events were performed.
The goal of this thesis has been to develop a CA model, LLUNPIY (Lahar modeling
by Local rules based on an UNderlying PIck of Yoked processes, from the Kichwa word
llunp’iy meaning flood), which is based on the CA semi-empirical approach to macroscopic
phenomena of Di Gregorio and Serra, in order to simulate the complex dynamics of lahars,
taking into account experience of models like SCIDDICA, SCIARA, PYR, VALANCA and
SCAVATU.; Università della CalabriaSoggetto
Cellular automata; Lahars; Natural hazard
Relazione
INF/01;