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| Titel |
The use of FLO2D numerical code in lahar hazard evaluation at Popocatépetl volcano: a 2001 lahar scenario |
| VerfasserIn |
L. Caballero, L. Capra |
| 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 ; 14, no. 12 ; Nr. 14, no. 12 (2014-12-20), S.3345-3355 |
| Datensatznummer |
250118807
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| Publikation (Nr.) |
 copernicus.org/nhess-14-3345-2014.pdf |
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| Zusammenfassung |
Lahar modeling represents an excellent tool for designing hazard maps. It
allows the definition of potential inundation zones for different lahar
magnitude scenarios and sediment concentrations. Here, we present the results
obtained for the 2001 syneruptive lahar at Popocatépetl volcano, based on
simulations performed with FLO2D software. An accurate delineation of this
event is needed, since it is one of the possible scenarios considered if
magmatic activity increases its magnitude.
One of the main issues for lahar simulation using FLO2D is the calibration of
the input hydrograph and rheological flow properties. Here, we verified that
geophone data can be properly calibrated by means of peak discharge
calculations obtained by the superelevation method. Digital elevation model
resolution also resulted as an important factor in defining the reliability
of the simulated flows.
Simulation results clearly show the influence of sediment concentrations and
rheological properties on lahar depth and distribution. Modifying rheological
properties during lahar simulation strongly affects lahar distribution. More
viscous lahars have a more restricted aerial distribution and thicker depths,
and resulting velocities are noticeably smaller.
FLO2D proved to be a very successful tool for delimitating lahar inundation
zones as well as generating different lahar scenarios not only related to
lahar volume or magnitude, but also taking into account different sediment
concentrations and rheologies widely documented as influencing lahar-prone
areas. |
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