Process type identification in torrential catchments in the eastern Alps

Heiser, Micha; Scheidl, Christian; Eisl, Julia; Spangl, Bernhard; Hübl, Johannes

doi:10.1016/j.geomorph.2015.01.007

Cited by 38 publications

(36 citation statements)

References 40 publications

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“…5). Therein, solely impacts of pure water floods (WFL according Heiser et al, 2015) are analysed. Any expected influence of sediments, substantially (i) loss of flow capacity in the torrent channel due to the transport of bed load (Gems et al, 2014a, b;Hübl et al, 2002;Hunzinger and Zarn, 1996), (ii) intrusion of sediments into the element at risk and (iii) a significant increase of impacting forces compared to clear water conditions (Mazzorana et al, 2014), are not considered.…”

Section: Introduction and Modelling Assumptionsmentioning

confidence: 99%

“…Modelling of building flooding (discharge) and intrusion (sediment) processes is a topic of current basic research and not yet explicitly considered within flood risk management, at least in the Alpine space. Reflecting capabilities and limits of numerical models, the simulation of torrential floods with intense sediment loads (WST and DBF according Heiser et al, 2015) is cur- rently restricted to 2-D numerical codes (e.g. Vetsch et al, 2014;Rosatti and Begnudelli, 2013).…”

Section: Introduction and Modelling Assumptionsmentioning

confidence: 99%

“…Further, impacts on load-bearing walls of the building are evaluated discretely in space and time. present case study analysis is a priori-constrained to pure water floods (WFL according to Heiser et al, 2015) and aimed mainly at the following research questions.…”

mentioning

confidence: 99%

“…-If constraining to pure water floods (WFL) with no involvement of bed load (Heiser et al, 2015), is there a relevant dynamic impact of the entraining water on the building structure and a noticeable influence on the flow field on the surrounding flood plain?…”

mentioning

confidence: 99%

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3-D hydrodynamic modelling of flood impacts on a building and indoor flooding processes

Gems

Mazzorana

Hofer³

et al. 2016

Nat. Hazards Earth Syst. Sci.

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Abstract. Given the current challenges in flood risk management and vulnerability assessment of buildings exposed to flood hazards, this study presents three-dimensional numerical modelling of torrential floods and its interaction with buildings. By means of a case study application, the FLOW-3D software is applied to the lower reach of the Rio Vallarsa torrent in the village of Laives (Italy). A single-family house on the flood plain is therefore considered in detail. It is exposed to a 300-year flood hydrograph. Different building representation scenarios, including an entire impervious building envelope and the assumption of fully permeable doors, light shafts and windows, are analysed. The modelling results give insight into the flooding process of the building's interior, the impacting hydrodynamic forces on the exterior and interior walls, and further, they quantify the impact of the flooding of a building on the flow field on the surrounding flood plain. The presented study contributes to the development of a comprehensive physics-based vulnerability assessment framework. For pure water floods, this study presents the possibilities and limits of advanced numerical modelling techniques within flood risk management and, thereby, the planning of local structural protection measures.

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Section: Introduction and Modelling Assumptionsmentioning

confidence: 99%

Section: Introduction and Modelling Assumptionsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

3-D hydrodynamic modelling of flood impacts on a building and indoor flooding processes

Gems

Mazzorana

Hofer³

et al. 2016

Nat. Hazards Earth Syst. Sci.

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“…Flash flood is usually understand as a high-intensity rainfall event [intensive rainfall up to 12 h (Gaume et al 2009)] leading to high peak discharges (IAHS-UNESCO-WMO 1974), where the size of the catchment area is in most of the cases less than 1000 km 2 ; with rather low runoff coefficients (Marchi et al 2010). Additionally, the catchment shape includes a mean channel slope of less than 5-10 % (Rickenmann et al 2008;Scheidl and Rickenmann 2010;Heiser et al 2015). The timeliness of flood anticipation (relationship between catchment size and flood response time) is (depending on the catchment size) most of the time less than 6 h (Creutin et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Micro-sized enterprises: vulnerability to flash floods

et al. 2016

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In the framework of risk assessment for flash floods, vulnerability is a key concept to assess the susceptibility of elements at risk. Vulnerability is defined as expected degree of loss for an element at risk due to a hazard impact of a defined magnitude and frequency. Besides the increasing number of studies on flash floods available, in-depth information on vulnerability was missing so far. In order to close this gap, a vulnerability model was created for micro-sized enterprises exposed to flash floods in Greece. This model was based on a nonlinear regression approach using data from four different events. By means of bootstrapping, different functions were fitted to the data, and a modified Weibull distribution was found to represent the relationship between process magnitude and degree of loss best. Moreover, there is no need to distinguish between different business sectors when computing vulnerability for buildings exposed. The model can be applied on a local scale and may serve as a basis for flash flood risk management.

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Water yield and sediment export in small, partially glaciated Alpine watersheds in a warming climate

Micheletti

Lane

2016

Water Resources Research

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Climate change is expected to modify the hydrological and geomorphological dynamics of mountain watersheds significantly, so impacting on downstream water yield and sediment supply. However, such watersheds are often poorly instrumented, making it difficult to link recent and rapid climate change to landscape response. Here we combine unique records of river flow and sediment export, with historical archival imagery to test the hypothesis that climate warming has substantially increased both water yield and sediment export from small Alpine watersheds (<3 km2) characterized by small (<0.5 km2 surface) glaciers. To examine ice and landform response to climate change, we apply archival digital photogrammetry to historical aerial imagery available from 1967 to present. We use the resulting data on ice loss, in combination with reliable records of stream flow from hydroelectric power intakes and climate data to approximate a water budget and to determine the evolution of different contributions to river flow. We use the stream flow records to estimate volumetric sediment transport capacity and compare this with the volumes of sand and gravel exported from the watersheds, quantified from records of intake flushing. The data show clearly that climate forcing since the early 1980s has been accompanied by a net increase in both water yield and sediment transport capacity, and we attribute these as signals of reduced snow accumulation and glacier recession. However, sediment export has not responded in the same way and we attribute this to limits on sediment delivery to streams because of poor rockwall‐hillslope‐channel connectivity. However, we do find that extreme climate conditions can be seen in sediment export data suggesting that these, rather than mean climate warming, may dominate watershed response.

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Process type identification in torrential catchments in the eastern Alps

Cited by 38 publications

References 40 publications

3-D hydrodynamic modelling of flood impacts on a building and indoor flooding processes

3-D hydrodynamic modelling of flood impacts on a building and indoor flooding processes

Micro-sized enterprises: vulnerability to flash floods

Water yield and sediment export in small, partially glaciated Alpine watersheds in a warming climate

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