A Modeling Approach for Lahar Hazard Assessment: the Case of Tamasagra Sector in the City of Pasto, Colombia

The computational program Titan2F, a two phase flow modeling program, is used to model several hypothetical scenarios of volcanic origin mud flows (lahars) in order to estimate the spacial and temporary evolution of this potentially destructive natural phenomena at its entrance of the city of Pasto,...

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Autores:
Guerrero, Alejandra
Criollo, Ruby Alicia
Cordoba, Gustavo A.
Rodríguez, Diana
Tipo de recurso:
Fecha de publicación:
2019
Institución:
Universidad EAFIT
Repositorio:
Repositorio EAFIT
Idioma:
eng
OAI Identifier:
oai:repository.eafit.edu.co:10784/17654
Acceso en línea:
http://hdl.handle.net/10784/17654
Palabra clave:
Two phase flows
Deep averaged model
Lahars
Mud flows
Lahar flow hazard
Hazard assessment
Flujos bifásicos
Modelo de profundidad media
Lahares
Flujos de lodo
Amenaza por lahares
Estimación de la amenaza
Rights
License
Copyright © 2019 Alejandra Guerrero, Ruby Alicia Criollo, Gustavo A Cordoba, Diana Rodríguez
Description
Summary:The computational program Titan2F, a two phase flow modeling program, is used to model several hypothetical scenarios of volcanic origin mud flows (lahars) in order to estimate the spacial and temporary evolution of this potentially destructive natural phenomena at its entrance of the city of Pasto, Colombia through the Mijitayo river basin. The predictions of the program suggest that extremely high and destructive dynamic pressures at the entrance to the city can be expected. In addition, our simulations show that half of the Tamasagra and El Bosque neighbors can be inundated with lahar depths of about 1 meter thickness. The program shows to be capable to deal with the modeling of the effect of the streets and buildings on the flow behavior, showing how the streets channelizes the flow governing the path of it. In addition, our results allow to identify regions where the flow loss most of its energy, where mitigation of risk can be suggested.