Large wood clogging during floods in a gravel-bed river: the Długopole bridge in the Czarny Dunajec River, Poland : Large wood clogging during floods

Détails

ID Serval
serval:BIB_E7876D1D6686
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Large wood clogging during floods in a gravel-bed river: the Długopole bridge in the Czarny Dunajec River, Poland : Large wood clogging during floods
Périodique
Earth Surface Processes and Landforms
Auteur⸱e⸱s
Ruiz-Villanueva Virginia, Wyżga Bartłomiej, Mikuś Paweł, Hajdukiewicz Maciej, Stoffel Markus
ISSN
0197-9337
Statut éditorial
Publié
Date de publication
15/03/2017
Peer-reviewed
Oui
Volume
42
Numéro
3
Pages
516-530
Langue
anglais
Résumé
During floods, large quantities of wood can be mobilized and transported downstream. At critical sections, such as bridges, the transported wood might be entrapped and a quick succession of backwater effects can occur as a result of the reduction of the cross-sectional area. The aim of this work is to explore large wood-related hazards during floods in the gravel-bed river Czarny Dunajec (Polish Carpathians), where the river flows through the village of Długopole. This work is based on the numerical modelling of large wood transport together with flow dynamics in which inlet and boundary conditions were designed based on field observations. The exploratory approach developed in this study uses multiple scenarios (193) to analyse the factors controlling bridge clogging: wood size, wood supply, flow conditions, morphology and obstacles in the riverbed. Results highlighted the strong control of log length (stronger than that of log diameter) on potential blockage probability; however, according to our results the main factor controlling bridge clogging was the flood discharge. River morphology and wood supply play an important role as well. The river morphology may reduce bridge blockage, as it influences flow velocity and depth, and creates natural retention zones for wood. In addition, the impacts of bridge blockage were analysed in terms of afflux depth and length, and flooded area. Results showed that bridge blockage may result in a significant increase in water depth (up to 0.7 m) and flooded area (up to 33% more), therefore increasing flood risk in the village.
Mots-clé
Driftwood, woody debris, wood transport, bridge clogging, lood risk
Web of science
Création de la notice
17/10/2020 11:03
Dernière modification de la notice
13/12/2022 9:04
Données d'usage