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Communication Dans Un Congrès Année : 2021

Driftwood and Hybrid Debris Barrier Interactions: Process of Trapping and Prevention of Releases during Overtopping

Interactions entre bois flottant et plages de dépôt hybrides: Processus de piégeage et prévention des relargages par surverse

Résumé

This study presents a new concept of debris barrier based on an experimental application to the Combe de Lancey stream (Villard-Bonnot, France). In 2005, 20,000 m 3 of gravels and large wood (LW) were transported and deposited. A debris basin was designed to trap sediment and LW supplied by extreme events while letting routine bedload transport to pass through. Here, hybrid barrier was successfully tested to achieve this dual objective. A short description of the catchment and proposed barrier is presented. Its trapping efficacy was also examined with a small-scale model. These laboratory observations were used to calibrate a numerical Discrete Element Model that to study processes driving LW entrapment and release. It highlights that a high accumulation of LW may occur on barriers. When water overflowed the barrier above a critical depth, the overtopping of massive LW was observed. To prevent it, a rack was tested and proved sufficient.
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hal-03363332 , version 1 (03-10-2021)

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  • HAL Id : hal-03363332 , version 1

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Toshiyuki Horiguchi, Guillaume Piton, Muhammad Badar Munir, Vincent Mano. Driftwood and Hybrid Debris Barrier Interactions: Process of Trapping and Prevention of Releases during Overtopping. 14th INTERPRAEVENT Congress : Natural hazards in a changing world, May 2021, Bergen (virtual), Norway. pp.206-215. ⟨hal-03363332⟩
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