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Field Study on Wood Accumulation at a Bridge Pier

Laboratory of Hydraulics, Hydrology and Glaciology (VAW), ETH Zurich, 8093 Zurich, Switzerland
Author to whom correspondence should be addressed.
Academic Editor: Alistair Borthwick
Water 2021, 13(18), 2475;
Received: 23 June 2021 / Revised: 29 August 2021 / Accepted: 3 September 2021 / Published: 9 September 2021
(This article belongs to the Special Issue Impact of Large Wood on River Ecosystems)
Transported large wood (LW) in rivers may block at river infrastructures such as bridge piers and pose an additional flood hazard. An improved process understanding of LW accumulations at bridge piers is essential for a flood risk assessment. Therefore, we conducted a field study at the River Glatt in Zurich (Switzerland) to analyze the LW accumulation process of single logs at a circular bridge pier and to evaluate the results of previous flume experiments with respect to potential scale effects. The field test demonstrated that the LW accumulation process can be described by an impact, rotation, and separation phase. The LW accumulation was described by combining two simplified equilibria of acting forces and moments, which are mainly a function of the pier diameter, pier roughness, and flow properties. We applied the resulting analytic criterion to the field data and demonstrated that the criterion can explain the behavior of 82% of the logs. In general, the field observations confirmed previous results on the LW accumulation probability in the laboratory, which supports the applicability of laboratory studies to investigate LW–structure interactions. View Full-Text
Keywords: accumulation probability; field tests; flood risk assessment; large wood (LW); river engineering accumulation probability; field tests; flood risk assessment; large wood (LW); river engineering
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MDPI and ACS Style

Wyss, A.; Schalko, I.; Weitbrecht, V. Field Study on Wood Accumulation at a Bridge Pier. Water 2021, 13, 2475.

AMA Style

Wyss A, Schalko I, Weitbrecht V. Field Study on Wood Accumulation at a Bridge Pier. Water. 2021; 13(18):2475.

Chicago/Turabian Style

Wyss, Andris, Isabella Schalko, and Volker Weitbrecht. 2021. "Field Study on Wood Accumulation at a Bridge Pier" Water 13, no. 18: 2475.

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