Debris-flow activity in five adjacent gullies in a limestone mountain range

Schraml, Klaus; Oismüller, Markus; Stoffel, Markus; Hübl, Johannes; Kaitna, Roland

doi:10.1515/geochr-2015-0007

Cited by 20 publications

(8 citation statements)

References 42 publications

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“…A rain gauge in the village of Gstatterboden, opposite the fan, recorded a mean annual precipitation between 1000 and 1700 mm. Schraml et al (2015) reconstructed debris-flow events on several gullies of the steep Planspitze north face through dendro-geomorphic techniques, including an event chronology of the Festeticgraben debris fan, as well as information on the geology and forest stand of the northern Planspitze area. In this study we focus on the most recent event, for which material deposited on the forested fan widely spread on both sides of the channel.…”

Section: Study Sitesmentioning

confidence: 99%

Modeling debris-flow runout patterns on two alpine fans with different dynamic simulation models

Schraml

Thomschitz

McArdell

et al. 2015

Nat. Hazards Earth Syst. Sci.

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Abstract. 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 −2 ], ranging between 0.07 to 0.11 and 200 to 300 m s −2 , respectively, for RAMMS-DF, and between 0.07 to 0.08 and 300 to 400 m s −2 , 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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Section: Study Sitesmentioning

confidence: 99%

Modeling debris-flow runout patterns on two alpine fans with different dynamic simulation models

Schraml

Thomschitz

McArdell

et al. 2015

Nat. Hazards Earth Syst. Sci.

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show abstract

“…Contrary to RAMMS, DAN3D is based on smoothed particle hydrodynamics (SPH) (Lucy, 1977;Gingold and Monaghan, 1977) to solve the governing equations resulting in flow depths, velocities and erosion thickness. Here the equations are solved in the center of reference columns and these mass particles are in the flow and progressed to a new position for each time step individually (Monaghan, 1989;Benz, 1990;Sosio et al, 2008). The SPH method uses the Langrangian reference frame and does not need a computational grid.…”

Section: Simulation Tools and Friction Relationmentioning

confidence: 99%

“…Comparative studies indicate that the Voellmy model (detailed in Sect. 2), which was originally developed for modeling bulk flow propagation of snow avalanches, is also suitable for modeling other geomorphic processes, including rock avalanches and debris-flows (e.g., Hungr, 1995;Revellino et al, 2004;Naef et al, 2006;Sosio et al, 2008;Deline et al, 2011). For snow avalanches, a reasonable database of model parameters for different types of snow and land cover is available (e.g., Bartelt et al, 2013a).…”

Section: Introductionmentioning

confidence: 99%

Modeling debris-flow runout patterns on two alpine fans with different dynamic simulation models

Schraml¹,

Thomschitz²,

McArdell³

et al. 2015

Preprint

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Abstract. Predicting potential deposition areas of future debris-flow events is important for engineering hazard assessment in alpine regions. For this, 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 model with a 1 m resolution and similar initial conditions. Our results show that both simulation tools are capable of matching observed deposition patterns. The best fit parameter set of μ [–] and ξ [m s−2] range between 0.07–0.11 and 200–300 m s−2, respectively, for RAMMS-DF, and 0.07–0.08 and 300–400 m s−2, respectively, for DAN3D. Sensitivity analyses show a higher sensitivity of model parameters for the DAN3D model than for the RAMMS-DF model. This study shall contribute 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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“…George and Nielsen, 2003;Zielonka et al, 2008), and have, with only a few exceptions, looked at the regional scale (i.e. Ballesteros-Cánovas et al, 2015c, in press;Bollschweiler and Stoffel, 2010;Procter et al, 2011;Schraml et al, 2015;Šilhan et al, 2015;Stoffel et al, 2014b). However, according to Procter et al (2011), the regional assessment of past hydro-climate related processes could be of substantial help in terms of reducing lack of data and maximizing the information available in a given area.…”

Section: Introductionmentioning

confidence: 99%

Regional reconstruction of flash flood history in the Guadarrama range (Central System, Spain)

Rodríguez-Morata

Ballesteros‐Cánovas

Trappmann³

et al. 2016

Science of The Total Environment

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• Flash floods represent a regional natural hazard in Guadarrama range.• Dendrochronology allows fill the lack of systematic data in mountain environments.• Regional studies and quality samples allow reducing the number of collected samples.• We complement existing records with 8 events covering the last~200 years.• Forest management could limit the amount of proxy evidence of flash flood events. Flash floods are a common natural hazard in Mediterranean mountain environments and responsible for serious economic and human disasters. The study of flash flood dynamics and their triggers is a key issue; however, the retrieval of historical data is often limited in mountain regions as a result of short time series and the systematic lack of historical data. In this study, we attempt to overcome data deficiency by supplementing existing records with dendrogeomorphic techniques which were employed in seven mountain streams along the northern slopes of the Guadarrama Mountain range. Here we present results derived from the tree-ring analysis of 117 samples from 63 Pinus sylvestris L. trees injured by flash floods, to complement existing flash flood records covering the last~200 years and comment on their hydro-meteorological triggers. To understand the varying number of reconstructed flash flood events in each of the catchments, we also performed a comparative analysis of geomorphic catchment characteristics, land use evolution and forest management. Furthermore, we discuss the limitations of dendrogeomorphic techniques applied in managed forests. G R A P H I C A L A B S T R A C T a b s t r a c t a r t i c l e i n f o

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Debris-flow activity in five adjacent gullies in a limestone mountain range

Cited by 20 publications

References 42 publications

Modeling debris-flow runout patterns on two alpine fans with different dynamic simulation models

Modeling debris-flow runout patterns on two alpine fans with different dynamic simulation models

Modeling debris-flow runout patterns on two alpine fans with different dynamic simulation models

Regional reconstruction of flash flood history in the Guadarrama range (Central System, Spain)

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