Cotes et crues de protection, de sûreté et de danger de rupture

Royet, Paul; Degoutte, Gérard; Peyras, Laurent; Lavabre, Jacques; Lemperrière, François

doi:10.1051/lhb/2010018

Cited by 5 publications

(1 citation statement)

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“…events reasonably higher than the design events should be performed to verify if dramatic aggravation might emerge during such functional or structural overloading. Consistent with the terminology used for dams (Royet et al 2010), we call "danger events", the events for which the structural stability or capacity to achieve its functionhere, the trapping of LW-is no longer guaranteed. The whole range of events should be studied by designers.…”

Section: Introductionmentioning

confidence: 99%

Small-Scale Modeling of Flexible Barriers. II: Interactions with Large Wood

Piton

Mayo

2023

J. Hydraul. Eng.

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During strong floods, rivers often carry significant amounts of sediment and pieces of large wood (LW). When bridges and hydraulic structures are unable to allow LW to pass through, it becomes necessary to trap LW through specific wood retention structures (e.g., flexible barriers). This paper presents a comprehensive analysis of the interactions between LW and flexible barriers using small scale models. A dimensionless criterion is first proposed to compute blockage probability of single logs. It is based on experiments varying log size and shape, channel slope (2%, 4%, and 6%), water discharge, and barrier bottom clearance. Based on runs using six mixtures of hundreds of logs, an equation is secondly provided to compute flow depth at a barrier accounting for the head losses related to large numbers of logs. Conditions leading to the release of LW when the barrier is severely overwhelmed are also studied. The deformation measured on the barrier proves to be lower with LW-laden flows than under full hydrostatic loading of a barrier obstructed by a plastic sheet. Overall, we demonstrate that flexible barriers are very relevant structures to trap LW. A companion paper shows how to design and manufacture a small scale flexible barrier in mechanical similitude with the prototype scale.

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Section: Introductionmentioning

confidence: 99%