Hangwassermodellierungen und deren Möglichkeit zur Abschätzung von potenziellen Gefährdungen für Gebäude

Starl, Hans

doi:10.1002/bate.201900028

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…Integrated 1D/2D models are often used to identify potential flood areas [14] and couple 2D overland flow and 1D sewer flow [15]. The question of whether the sewer system should be included [16,17], simplified, or discarded [18,19] in urban flood models is still under discussion. However, the current trend is to include sewer networks [20][21][22], especially in urban catchments, as the main cause of urban flooding is often the limited capacity of the sewerage system to interact with overland flow [23].…”

Section: Introductionmentioning

confidence: 99%

The Impact of Underground Structures on Urban Flood Models

Hauser,

Reinstaller,

Oberascher

et al. 2024

Water

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Owing to climate change, heavy rainfall events have increased in recent years, often resulting in urban flooding. Urban flood models usually consider buildings to be closed obstacles, which is not the case in reality. To address this research gap, an existing 1D/2D model was extended with underground structures. The underground structures were located using site visits, Google Earth, and information provided by the city administration. Control strategies were used to represent partially open doors or tilted windows. The model was simulated with three measured rainfall events in three different scenarios. Scenarios with underground structures resulted in small storage volumes in the structures and a slightly less flooded area on the surface. The assumptions made were analysed using sensitivity analysis. Varying the number and location of underground structures resulted in small variations in the stored volume and surface flood volume. The sensitivity analysis also showed that the thresholds for height and velocity had a large impact, whereas the opening percentage did not influence the number of buildings affected. The conclusion of the study is that the inclusion of underground structures has little effect on the predicted flooded areas but can be useful in quantifying the water depth in potentially vulnerable buildings.

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Section: Introductionmentioning

confidence: 99%

The Impact of Underground Structures on Urban Flood Models

Hauser,

Reinstaller,

Oberascher

et al. 2024

Water

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“…The required level of model accuracy is one of the most discussed topics in the field of urban flooding. Despite numerous studies published in recent years, there is no clear answer to the question whether the urban drainage system must be included in an urban flood model [38][39][40], if it can be discarded or simplified with source and sink terms [41][42][43]. However, a trend in literature can be identified, leaning towards considering drainage systems in urban flood assessment [44].…”

Section: Introductionmentioning

confidence: 99%

Identification of High-Impact Uncertainty Sources for Urban Flood Models in Hillside Peri-Urban Catchments

Reinstaller

Krebs

Pichler

et al. 2022

Water

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Climate change, as well as increasing urbanization, lead to an increase in urban flooding events around the world. Accurate urban flood models are an established tool to predict flooding areas in urban as well as peri-urban catchments, to derive suitable measures to increase resilience against urban flooding. The high computational cost and complex processes of urban flooding with numerous subprocesses are the reason why many studies ignore the discussion of model uncertainties as well as model calibration and validation. In addition, the influence of steep surface (hillside) conditions on calibration parameters such as surface roughness are frequently left out of consideration. This study applies a variance-based approach to analyze the impact of three uncertainty sources on the two variables—flow and water depth—in a steep peri-urban catchment: (i) impact of DEM validation; (ii) calibration of the model parameter; (iii) differences between 1D/2D and 2D models. The results demonstrate the importance of optimizing sensitive model parameters, especially surface roughness, in steep catchments. Additional findings of this work indicate that the sewer system cannot be disregarded in the context of urban flood modeling. Further research with real heavy storm events is to be pursued to confirm the main results of this study.

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“…Überflutungen durch oberflächlich abfließendes Wasser infolge von Starkregenereignissen sind in den letzten Jahren in Österreich und im benachbarten Ausland vermehrt in den Fokus des öffentlichen, medialen und wissenschaftlichen Interesses gerückt (u. a. Achleitner et al 2020a;LUBW 2016;Bernet et al 2017;Lumassegger et al 2016a, b;Zahnt et al 2018;Kipfer et al 2018;Starl 2020). In den letzten Jahren konnten wiederholt Schadensereignisse infolge kleinräumiger Starkregen beobachtet werden.…”

Section: Introductionunclassified

Modellierung pluvialer Sturzfluten – Anforderungen und Sensitivitäten der 2D-hydraulischen Modellierung

Huber

Lumassegger

Köhl

et al. 2021

Österr Wasser- und Abfallw

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ZusammenfassungLokale Starkregen und der daraus resultierende Oberflächenwasserabfluss führten in den letzten Jahren vermehrt zu pluvialen Sturzfluten (Hangwässern) verbunden mit Überflutungen und Schäden. Auch in Österreich kam es vermehrt zu derartigen Ereignissen bei denen nicht nur urban geprägte Gebiete, sondern auch vielfach ländliche Gebiete mit überwiegend landwirtschaftlicher Nutzung betroffen waren. Überflutungsmodellierungen sowie daraus abgeleitete Risikoabschätzungen und Maßnahmenplanungen stellen wichtige Werkzeuge dar, um zukünftig Schäden abzuwenden bzw. zu minimieren. In den Projekten RAINMAN, AQUACLEW und SAFFER-CC kamen an mehreren Fallbeispielen unterschiedliche 2D-hydrodynamische, numerische (2D-HN) Oberflächenabflussmodelle zur Anwendung, um Überflutungsflächen, Wasserstände und Fließgeschwindigkeiten abzuschätzen. Neben dem Vergleich unterschiedlicher Modelle wurde die Sensitivität von Modellparametern bei unterschiedlichen Bemessungsszenarien erfasst. Hinsichtlich der Abflussbildung wurde die Auswirkung geänderter Abflussbeiwerte (Landnutzungsänderung, Unsicherheiten etc.) auf die Überflutungsbilder erhoben. Analog wurden Modellsensitivitäten bei den Prozessen der Abflusskonzentration betrachtet. Der Einfluss von Modellauflösung, Parametrisierung der Rauheit, Implementierung hydraulisch relevanter Strukturen (Gebäude, Mauern und Durchlässe) wurden mit unterschiedlichen hydraulischen Modellen getestet. Zur Anwendung kamen dabei rasterbasierte Modelle und Ansätze mit freien/unstrukturierten Netzen.

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Hangwassermodellierungen und deren Möglichkeit zur Abschätzung von potenziellen Gefährdungen für Gebäude

Cited by 4 publications

References 3 publications

The Impact of Underground Structures on Urban Flood Models

The Impact of Underground Structures on Urban Flood Models

Identification of High-Impact Uncertainty Sources for Urban Flood Models in Hillside Peri-Urban Catchments

Modellierung pluvialer Sturzfluten – Anforderungen und Sensitivitäten der 2D-hydraulischen Modellierung

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