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| Titel |
Secondary lahar hazard assessment for Villa la Angostura, Argentina, using Two-Phase-Titan modelling code during 2011 Cordón Caulle eruption |
| VerfasserIn |
G. Cordoba, G. Villarosa, M. F. Sheridan, J. G. Viramonte, D. Beigt, G. Salmuni |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Sciences ; 15, no. 4 ; Nr. 15, no. 4 (2015-04-08), S.757-766 |
| Datensatznummer |
250119416
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| Publikation (Nr.) |
 copernicus.org/nhess-15-757-2015.pdf |
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| Zusammenfassung |
| This paper presents the results of lahar modelling in the town of Villa La
Angostura (Neuquén-Argentina) based on the Two-Phase-Titan modelling
computer code. The purpose of this exercise is to provide decision makers
with a useful tool to assess lahar hazard during the 2011 Puyehue-Cordón
Caulle Volcanic Complex eruption. The possible occurrence of lahars mobilized
from recent ash falls that could reach the city was analysed. The performance
of the Two-Phase-Titan model using 15 m resolution digital elevation models (DEMs) developed from
optical satellite images and from radar satellite images was evaluated. The
output of these modellings showed inconsistencies that, based on field
observations, were attributed to bad adjustment of the DEMs to real topography.
Further testing of results using more accurate radar-based 10 m DEM, provided
more realistic predictions. This procedure allowed us to simulate the path of
flows from Florencia, Las Piedritas and Colorado creeks, which are the most
hazardous streams for debris flows in Villa La Angostura. The output of the
modelling is a valuable tool for city planning and risk management especially
considering the glacial geomorphic features of the region, the strong urban
development growth and the land occupation that has occurred in the last decade in
Villa La Angostura and its surroundings. |
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