Estimating the deformation of a river bed using dimensionless geometric parameters and mathematical model

Lazović, Nerma (author), Krzyk, Mario (author)

The river channel cut into an alluvial substrate constantly adapts to changes in water flow and sediment transport. This paper presents a new approach to determine the magnitude of channel deformation based on the definition of dimensionless spatial parameters of channel deformation. The new approach’s applicability is evaluated by experimental studies on the Željeznica River in the Sarajevo Field in central Bosnia and Herzegovina. The morphological changes of the channel over a period of ten years were analyzed using dimensionless parameters of the channel geometry. A numerical analysis of changes in the channel of the Željeznica River was carried out using a mathematical model and a selected equation for sediment transport. Sensitivity analysis of the model parameters for channel deformation and statistical reliability analysis of the numerical model showed a good agreement between the modeled and observed values of channel deformation parameters during the analyzed period.

• Language: English
• Keywords: river morphology, dimensionless geometric parameters, river regime, sediment transport, channel deformation, HEC-RAS, Željeznica River, model reliability
• 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: 2024
• Number of pages: Str. 176-189
• Numbering: Vol. 37, no. 67
• PID: 20.500.12556/RUL-169045
• UDC: 556.53:626
• ISSN on article: 0352-3551
• DOI: 10.15292/acta.hydro.2024.10
• COBISS.SI-ID: 231180547
• Publication date in RUL: 08.05.2025

Record is a part of a journal

• Title: Acta hydrotechnica
• Publisher: Fakulteta za gradbeništvo in geodezijo
• ISSN: 0352-3551
• COBISS.SI-ID: 3664386

Licences

• License: CC BY-NC-SA 4.0, Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International
• Link: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Description: A Creative Commons license that bans commercial use and requires the user to release any modified works under this license.

Secondary language

• Language: Slovenian
• Title: Ocena deformacije rečne struge z uporabo brezdimenzijskih geometrijskih parametrov in matematičnega modela

Abstract

Struga reke, vrezana v aluvialno podlago, se nenehno prilagaja spremembam vodnega toka in transporta plavin. V prispevku je predstavljen nov pristop k določanju velikosti deformacije struge, ki temelji na opredelitvi brezdimenzijskih prostorskih parametrov deformacije struge. Ocena uporabnosti novega pristopa temelji na eksperimentalnih študijah na reki Željeznici na območju Sarajevskega polja v osrednjem delu Bosne in Hercegovine. Morfološke spremembe struge v desetletnem obdobju so analizirane na podlagi brezdimenzijskih parametrov geometrije struge. S pomočjo matematičnega modela in izbrane enačbe za transport plavin je izvedena numerična analiza sprememb v strugi reke Željeznice. Analiza občutljivosti parametrov modela deformacije rečne struge in analiza statistične zanesljivosti numeričnega modela sta pokazali dobro ujemanje med modeliranimi in opazovanimi vrednostmi deformacije rečne struge v analiziranem obdobju.

• Keywords: rečna morfologija, brezdimenzijski geometrijski parametri, rečni režim, transport plavin, deformacija struge, reka Željeznica, HEC-RAS, zanesljivost modela