Impact of the rainfall duration and temporal rainfall distribution defined using the Huff curves on the hydraulic flood modelling results

Bezak, Nejc (author), Šraj, Mojca (author), Rusjan, Simon (author), Mikoš, Matjaž (author)

In the case of ungauged catchments, different procedures can be used to derive the design hydrograph and design peak discharge, which are crucial input data for the design of different hydrotechnical engineering structures, or the production of flood hazard maps. One of the possible approaches involves using a hydrological model where one can calculate the design hydrograph through the design of a rainfall event. This study investigates the impact of the design rainfall on the combined one-dimensional/two-dimensional (1D/2D) hydraulic modelling results. The Glinščica Stream catchment located in Slovenia (central Europe) is used as a case study. Ten different design rainfall events were compared for 10 and 100-year return periods, where we used Huff curves for the design rainfall event definition. The results indicate that the selection of the design rainfall event should be regarded as an important step, since the hydraulic modelling results for different scenarios differ significantly. In the presented experimental case study, the maximum flooded area extent was twice as large as the minimum one, and the maximum water velocity over flooded areas was more than 10 times larger than the minimum one. This can lead to the production of very different flood hazard maps, and consequently planning very different flood protection schemes.

• Language: English
• Keywords: design storm, hydraulic modelling, flood hazards, Glinščica catchment, hydrological modelling, Huff curves, HEC-RAS
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2018
• Number of pages: 15 str.
• Numbering: Vol. 8, iss. 2, art. 69
• PID: 20.500.12556/RUL-131866
• UDC: 556.12(045)
• ISSN on article: 2076-3263
• DOI: 10.3390/geosciences8020069
• COBISS.SI-ID: 8314209
• Publication date in RUL: 05.10.2021

Record is a part of a journal

• Title: Geosciences
• Shortened title: Geosciences
• Publisher: MDPI
• ISSN: 2076-3263
• COBISS.SI-ID: 519967769

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
• Licensing start date: 11.02.2018

Secondary language

• Language: Slovenian
• Keywords: projektni padavinski dogodek, hidravlično modeliranje, poplavna ogroženost, porečje Glinščice, hidrološko modeliranje, Huffove krivulje, HEC-RAS

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: J2-7322
• Name: Modeliranje hidrološkega odziva nehomogenih povodij

• Funder: ARRS - Slovenian Research Agency
• Project number: P2-0180
• Name: Vodarstvo in geotehnika: orodja in metode za analize in simulacije procesov ter razvoj tehnologij