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DOI10.1029/2021WR030485
Roughness-based Method for Simulating Hydraulic Consequences of both Woody Debris Clogging and Breakage at Bridges in Basin-scale Flood Modelling
Francesco Macchione; Margherita Lombardo
2021-11-24
发表期刊Water Resources Research
出版年2021
英文摘要

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 modelling 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.

This article is protected by copyright. All rights reserved.

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文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/342355
专题资源环境科学
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Francesco Macchione,Margherita Lombardo. Roughness-based Method for Simulating Hydraulic Consequences of both Woody Debris Clogging and Breakage at Bridges in Basin-scale Flood Modelling[J]. Water Resources Research,2021.
APA Francesco Macchione,&Margherita Lombardo.(2021).Roughness-based Method for Simulating Hydraulic Consequences of both Woody Debris Clogging and Breakage at Bridges in Basin-scale Flood Modelling.Water Resources Research.
MLA Francesco Macchione,et al."Roughness-based Method for Simulating Hydraulic Consequences of both Woody Debris Clogging and Breakage at Bridges in Basin-scale Flood Modelling".Water Resources Research (2021).
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