Influence of Bamboo Debris Accumulation Formed by Culvert Bridges on Backwater Rise During Flash Flood

Rusyda, Muhammad Islamy

doi:10.21660/2020.75.19873

Cited by 1 publication

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“…Furthermore, recent floods have highlighted how bridges can represent important obstacles to flood current and today the problem is under the attention of the institutions operating in the field of flood risk management (Manciola et al, 2019). During large floods, reduction of the flow capacity and consequent rise in the levels of the free surface can occur (as highlighted in Ruiz-Villanueva et al, 2014;Rusyda, Ikematsu, & Hashimoto, 2020;Rusyda, Isfanari, et al, 2020, Schmocker et al, 2015 and the formation of impoundments upstream of the crossing structure can be amplified by the partial or total obstruction of the bridge spans by stones and woody debris carried by the flood. The backwater rise effect induced by accumulations of woody material is the subject of numerous studies (Follett et al, 2020;Piton et al, 2020;Schalko et al, 2018Schalko et al, , 2019Schmocker & Hager, 2013) which have led to experimental formulas for the estimation of the water depth increase in the presence of accumulations.…”

Section: Introductionmentioning

confidence: 99%

Roughness‐Based Method for Simulating Hydraulic Consequences of Both Woody Debris Clogging and Breakage at Bridges in Basin‐Scale Flood Modeling

Macchione

Lombardo

2021

Water Resources Research

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Obstructions at bridge can exacerbate flood hazard: when woody debris occlude a bridge, backwater increases, and sometimes a temporary reservoir can form. If the condition for the collapse of the jam exists, the phenomenon can evolve into a dam break flow resulting in an increase in downstream discharge or a steepening in the flow hydrograph. A rigorous description of backwater formed by debris at the bridge, and more generally of the interaction between flood and structure, is still a challenge and only few studies focus on the breakage phase and its consequence on flood dynamic. Unfortunately, analyzing the hydraulics of so many localized situations within a large area in detail would involve considerable modeling and calculation costs. Therefore, treatment methods are desirable that provide correct results in terms of the reference hydraulic variables for assessing the hazard without the need to model extremely local phenomena. The purpose of this study is to evaluate the possibility to reproduce an observed or estimated backwater by the use of an equivalent roughness at the place of the bridge and simulate the breakage phase by a sudden variation of its value. The method, applied to the numerical reconstruction of the experimental tests of dam break performed by the Waterways Experiment Station in 1961, has provided results that overlap well with the experimental values. Furthermore, it was applied to the reconstruction of the historical flood occurred in the Soverato river (Calabria, Italy). It did not require local grid refinement and provided results faithful to flood marks.

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