Abstract
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.
Highlights
The city of Pasto is located at the South of Colombia, at 1o, 13′, 16“ North Latitude and 77o, 17′, 2“ West longitude
The Mijitayo river catchment settles over Jenoy Stage of Galeras volcano complex, whereas the superficial geology of the Mijitayo river basin consist mainly of lahar deposits [41],[1] and the 1866
In this paper we have studied the lahar hazard that could occur in Mijitayo creek towards the city of Pasto
Summary
The city of Pasto is located at the South of Colombia, at 1o, 13′, 16“ North Latitude and 77o, 17′, 2“ West longitude. The center of the city is placed almost at 9 km distance to the crater of Galeras volcano, which poses several kind of hazards among which lahar is one of the most important. According to [1], in our research area several basins around Galeras volcano are identified as prone to lahar generation. From the engineering point of view, prediction of the dynamics of such a flows is done through modeling. If the dynamics of the flow behavior is to be investigated or predicted, the later ones are to be used. This study uses the computational program Titan2F [8] to investigate the path, the predicted flow depth and dynamic pressures that can be expected when typical lahar flows from Mijitayo creek reaches the city of Pasto. The environment of the place where the research is done is explained, followed by how the digital elevation model was adjusted for the needs and the results are presented
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