Simplified versus Detailed Two-Dimensional Approaches to Transient Flow Modeling in Urban Areas

Petaccia, Gabriella; Frazao, Sandra Soares; Savi, F.; Natale, L.; Zech, Yves

doi:10.1061/(asce)hy.1943-7900.0000154

Cited by 27 publications

(13 citation statements)

References 8 publications

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“…Starting from the approach presented by Ruiz‐Villanueva et al (), a recent two‐dimensional numerical model for wood transport was developed by Persi, Petaccia, Manenti, Ghilardi, and Sibilla (). The log motion in their approach was implemented in the ORSA2D 2D hydrodynamic model using a dynamic approach (Petaccia, Soares‐Frazão, Savi, Natale, & Zech, ). In that study, the log was divided into four cells, and the resultant forces were calculated for each cell's centre.…”

Section: Recent Advances In Numerical Modelling Analysing Wood‐bridgementioning

confidence: 99%

In‐channel wood‐related hazards at bridges: A review

Cicco

Paris

Ruíz-Villanueva

et al. 2018

River Research & Apps

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In-channel wood is a key component in fluvial ecosystems; however, transport of inchannel wood during floods can create hazards in urbanized areas. Among the main problems is wood accumulation at bridges, which reduces flow openings, causes blockage and inundation of nearby areas and, eventually, results in structures collapsing. Increasing awareness of the importance of the ecological role of wood in rivers calls for a compromise between the preservation of river ecosystems and management strategies for the prevention of wood-related hazards. In recent years, knowledge related to in-channel wood dynamics and hazards has notably increased, and a significant body of valuable information can be found in an extensive number of studies. This review provides a comprehensive summary of the most relevant advances regarding in-channel wood-bridge interactions. We review the factors controlling wood accumulation formation and summarize the different approaches used to analyse this process, namely, physical and numerical modelling. Finally, we conclude by highlighting the most important knowledge gaps, addressing particularly underresearched fields and stressing the remaining challenges.

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Section: Recent Advances In Numerical Modelling Analysing Wood‐bridgementioning

confidence: 99%

In‐channel wood‐related hazards at bridges: A review

Cicco

Paris

Ruíz-Villanueva

et al. 2018

River Research & Apps

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“…To compute the hydrodynamic forces exerted on the body, the hydraulic variables of the flow are needed. Flow velocity and water level are computed through a full Eulerian 2D Shallow Water Equation (SWE) model, solved by the finite volume code ORSA2D [12,13]. It implements a Roe's Riemann solver, 1 st order accurate in time and space [14], applying an upwind discretization to the bottom slope source term [15], while the friction slope is evaluated in a semi-implicit way [16].…”

Section: Numerical Modelmentioning

confidence: 99%

Calibration of a numerical model for the transport of floating wooden debris

et al. 2018

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The paper describes the calibration of a numerical model to simulate the 2D motion of floating rigid bodies. The proposed model follows a one-way coupling Eulerian-Lagrangian approach, in which the solution of the Shallow Water Equations (SWE) is combined with the Discrete Element Method (DEM) to compute the displacement of rigid bodies. Floating bodies motion is computed by adapting the Maxey-Riley equation to the case of semi-submerged bodies at high Reynolds number. In order to account for the flow velocity distribution along the body axis, the elements are divided into shorter subsections. A specific formulation is proposed to calculate the rotation of wooden cylinders, by computing the angular momentum. The model includes also a term of added inertia, which accounts for the resistance to rotation and requires the calibration of a specific inertia coefficient. A series of flume experiments is performed to calibrate the model. The 2D trajectories of floating spheres and the linear and angular displacement of cylinders are recorded in stationary conditions. The comparison between the experimental data and the simulation shows that the numerical results are in agreement with the experimental ones, although less accuracy is observed in the reproduction of the angular displacement.

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“…When these data are unavailable or inaccurate, simplified models may be applied based on the porosity concept, which facilitates a representation of the reduction of water-storage and conveyance in the urban area and also higher friction coefficients. Petaccia et al (2010) claim that the water profile can be reasonably resolved by these simplified models.…”

Section: Introductionmentioning

confidence: 95%

Modelling of urban flooding due to Yangtze River dike break

Wang¹,

Cao²,

Pender³

et al. 2011

Proceedings of the Institution of Civil Engineers - Water Manag

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A computational case study is presented of the flooding in urban Jiujiang due to the Yangtze River dike break in August 1998. A shallow water hydrodynamic model was deployed based on the weighted average flux -total variation diminishing (WAF-TVD) finite volume algorithm. A series of numerical modelling was conducted to identify the influences of the mesh resolution and model parameterisation on the flood propagation. Three mesh resolutions (2, 5 and 10 m) were used, and spatially distributed roughness was specified based on land-use classification. Due to the highly irregular topography and densely distributed buildings, the flood propagation is largely hindered. The numerical results show that an area of merely 6 km 2 was inundated at 6 h following the dike break with a discharge of 400 m 3 /s. Mesh resolution and roughness parameterisation have considerable effects on the flood propagation, whereas the impact of turbulent eddy viscosity is negligible. A coarser mesh could result in a larger inundation area (10%), and a lumped roughness may produce an appreciable overestimation of the inundation area in the initial period of the flood propagation. This observation highlights the significance of mesh resolution and also physically meaningful estimation of the roughness for urban flood modelling.

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Simplified versus Detailed Two-Dimensional Approaches to Transient Flow Modeling in Urban Areas

Cited by 27 publications

References 8 publications

In‐channel wood‐related hazards at bridges: A review

In‐channel wood‐related hazards at bridges: A review

Calibration of a numerical model for the transport of floating wooden debris

Modelling of urban flooding due to Yangtze River dike break

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