Modeling debris-flow runout patterns on two alpine fans with different dynamic simulation models
Predicting potential deposition areas of future debris-flow events is important for engineering hazard assessment in alpine regions. To this end, numerical simulation models are commonly used tools. However, knowledge of appropriate model parameters is essential but often not available. In this stud...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2015-07-01
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| Series: | Natural Hazards and Earth System Sciences |
| Online Access: | http://www.nat-hazards-earth-syst-sci.net/15/1483/2015/nhess-15-1483-2015.pdf |
| Summary: | Predicting potential deposition areas of future debris-flow events is
important for engineering hazard assessment in alpine regions. To this end,
numerical simulation models are commonly used tools. However, knowledge of
appropriate model parameters is essential but often not available. In this
study we use two numerical simulation models, RAMMS–DF (rapid mass movement
system–debris-flow) and DAN3D (dynamic analysis of landslides in three
dimensions), to back-calculate two well-documented debris-flow events in
Austria and to compare the range and sensitivity of input parameters for the
Voellmy flow model. All simulations are based on the same digital elevation
models and similar boundary conditions. Our results show that observed
deposition patterns are best matched with a parameter set of μ [–] and
ξ [m s<sup>-2</sup>], ranging between 0.07 to 0.11 and
200 to 300 m s<sup>-2</sup>, respectively, for RAMMS–DF, and between 0.07 to 0.08 and
300 to 400 m s<sup>-2</sup>, respectively, for DAN3D. Sensitivity analysis
shows a higher sensitivity of model parameters for the DAN3D model than for
the RAMMS–DF model. This contributes to the evaluation of realistic model
parameters for simulation of debris-flows in steep mountain catchments and
highlights the sensitivity of the models. |
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| ISSN: | 1561-8633 1684-9981 |