Debris flows in the Swiss National Park: the influence of different flow models and varying DEM grid size on modeling results |
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| Authors: | Adrian Stolz Christian Huggel |
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| Institution: | 1.MeteoSwiss,Zürich,Switzerland;2.Department of Geography,University of Zurich,Zürich,Switzerland |
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| Abstract: | In the Swiss National Park, debris flows are a frequent phenomenon and have repeatedly affected highways and hiking structures.
In this study, we first investigated the main characteristics and dimensions of current debris flows by field work and empirical
parameterization schemes. Additionally, we evaluated a topography-based flow-trajectory geographic information system model
(MSF) and a flow-routing model (FLO-2D) in terms of debris flow-affected areas. Three generically different digital elevation
models (DEM) with grid spacing of 25, 4, and 1 m were used in conjunction with the flow models. The evaluation of the DEM
grid spacing shows that for both flow models the 25-m DEM can give an approximate estimation of the potential hazard zone.
Four- and one-meter DEMs mostly confine the simulated debris flow to existing channels and are in accordance with observations
of recent debris-flow events. The study shows that DEM quality and grid resolution are crucial for the resulting delineation
of potentially affected areas and thus for hazard assessment and mapping. |
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| Keywords: | Debris flow Flow models High-resolution DEM Swiss National Park |
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