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| Titel |
The importance of entrainment and bulking on debris flow runout modeling: examples from the Swiss Alps |
| VerfasserIn |
F. Frank, B. W. McArdell, C. Huggel, A. Vieli |
| 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. 11 ; Nr. 15, no. 11 (2015-11-30), S.2569-2583 |
| Datensatznummer |
250119779
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| Publikation (Nr.) |
 copernicus.org/nhess-15-2569-2015.pdf |
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| Zusammenfassung |
| This study describes an investigation of channel-bed entrainment of sediment
by debris flows. An entrainment model, developed using field data from
debris flows at the Illgraben catchment, Switzerland, was incorporated into
the existing RAMMS debris-flow model, which solves the 2-D shallow-water
equations for granular flows. In the entrainment model, an empirical
relationship between maximum shear stress and measured erosion is used to
determine the maximum potential erosion depth. Additionally, the average
rate of erosion, measured at the same field site, is used to constrain the
erosion rate. The model predicts plausible erosion values in comparison with
field data from highly erosive debris flow events at the Spreitgraben
torrent channel, Switzerland in 2010, without any adjustment to the
coefficients in the entrainment model. We find that by including bulking due
to entrainment (e.g., by channel erosion) in runout models a more realistic
flow pattern is produced than in simulations where entrainment is not
included. In detail, simulations without entrainment show more lateral
outflow from the channel where it has not been observed in the field.
Therefore the entrainment model may be especially useful for practical
applications such as hazard analysis and mapping, as well as scientific case
studies of erosive debris flows. |
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