Naturgefahrenprozesse und -szenarien

Rudolf‐Miklau, Florian; Hübl, Johannes; Fiebig, Markus; Formayer, Herbert; Jaritz, Wolfgang; Mölk, Michael; Kleemayr, Karl

doi:10.1007/978-3-7091-0681-5_2

Cited by 2 publications

(3 citation statements)

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“…Typically, both the hazard potential and the potential losses increase with an increasing sediment ratio. The history of torrential events in the Alpine region entirely confirms and emphasizes this statement (Bezzola et al, 2007;Rudolf-Miklau et al, 2006.…”

Section: Introductionmentioning

confidence: 59%

“…Material, which is activated during floods, further transported along the trunk torrent and partially deposited on the debris cone, is smallgrained and shows a comparatively uniform grain size distribution. These characteristics are specific features of torrent catchments in the Austrian Limestone Alps and significantly differ from crystalline Central Alps conditions and debrisflood/flow torrents, respectively (Hübl et al, 2003;Luzian et al, 2002;Rudolf-Miklau et al, 2006;Sommer and Lauffer, 1982).…”

Section: Catchment Characteristicsmentioning

confidence: 99%

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Experimental and numerical study on the design of a deposition basin outlet structure at a mountain debris cone

Gems

Wörndl

Gabl

et al. 2014

Nat. Hazards Earth Syst. Sci.

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Abstract. Mountain debris cones in the Alpine region often provide space for dense population and cultivation. Hence, a great number of buildings are exposed to torrential hazards. In order to protect the settlement areas against flooding and overbank sedimentation, torrent defence structures are implemented at various locations within catchments. Directly at the debris cones, these protection measures often include a deposition basin at the fan apex and/or a confined channel that passes through the settlement.The work presented within this paper deals with the effect of specific outlet structure layouts, situated at the lower end of a selected deposition basin, on bed-load transport processes and flood protection. A case study analysis was accomplished comprising a 3-D numerical model (FLOW-3D) and a physical scale model test (1 : 30). The subject of investigation was the deposition basin of the Larsennbach torrent in the Austrian Northern Limestone Alps. The basin is situated on a large debris cone and opens out into a paved channel. Since the basin is undersized and the accumulation of sediment in the outlet section reduces the available cross section during floods, adjoining settlements are considerably endangered of lateral overtopping of both clear water and sediment. Aiming for an upgrade in flood protection, certain layouts for a "closing-off structure" at the outlet were tested within this project. For the most efficient design layout, its effect on flood protection, a continuous bed-load output from the basin and the best possible use of the retention volume are pointed out. The simple design of the structure and the key aspects that have to be taken into consideration for implementation are highlighted.

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Section: Introductionmentioning

confidence: 59%

Section: Catchment Characteristicsmentioning

confidence: 99%

Experimental and numerical study on the design of a deposition basin outlet structure at a mountain debris cone

Gems

Wörndl

Gabl

et al. 2014

Nat. Hazards Earth Syst. Sci.

View full text Add to dashboard Cite

show abstract

“…The design of the paved channel and the junction to the receiving water course must not encourage regressive accumulation along the channel due to a backwater effect caused by the receiving water course. Both the design of the deposition basin and the constructional requirements of the paved channel, including the junction into the receiving water course, represent topics for currently ongoing and future challenging research (Hübl et al, 2002(Hübl et al, , 2012Hunzinger and Zarn, 1996;Kaitna et al, 2011;Kerschbaumer, 2008).…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical study on the design of a deposition basin outlet structure at a mountain debris cone

Gems¹,

Wörndl²,

Gabl³

et al. 2013

Preprint

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Abstract. Mountain debris cones in the Alpine region often provide space for dense population and cultivation. Hence, a great number of buildings are exposed to torrential hazards. In order to protect the settlement areas against flooding and overbank sedimentation, torrent defence structures are implemented directly at the debris cones. In many cases, these protection measures include a deposition basin at the head of the debris cone and/or a confined channel that passes or tracks through the settlement. The work presented within this paper deals with the effect of specific outlet structure layouts, situated at the lower end of a selected deposition basin, on bed-load transport processes and flood protection. A case study analysis was accomplished comprising of a 3-D-numerical model (FLOW-3D) and a physical scale model test (1:30). The subject of investigation was the deposition basin of the Larsennbach torrent in the Austrian Northern Limestone Alps. The basin is situated on a large debris cone and opens out into a paved channel. Since the basin is undersized and the accumulation of sediment in the outlet section reduces the available cross section during floods, adjoining settlements are considerably endangered of lateral overtopping of both clear water and sediment. Aiming for an upgrade in flood protection, certain layouts for a "closing-off structure" at the outlet were tested within this project. For the most efficient design layout, its effect on flood protection, a continuous bed-load output from the basin and the best possible use of the retention volume are pointed out. The simple design of the structure and the key aspects, that have to be taken into consideration for implementation, are highlighted.

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Naturgefahrenprozesse und -szenarien

Cited by 2 publications

References 0 publications

Experimental and numerical study on the design of a deposition basin outlet structure at a mountain debris cone

Experimental and numerical study on the design of a deposition basin outlet structure at a mountain debris cone

Experimental and numerical study on the design of a deposition basin outlet structure at a mountain debris cone

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