Conservative 1D–2D coupled numerical strategies applied to river flooding: The Tiber (Rome)

Morales-Hernändez, Mario; Petaccia, Gabriella; Brufau, P.; García‐Navarro, P.

doi:10.1016/j.apm.2015.08.016

Cited by 50 publications

(27 citation statements)

References 31 publications

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“…Some recent research investigates in the coupled 1D-2D modelling at the level of accuracy and efficiency details (Morales-Hernández et al, 2016). In the coupled 1D-2D simulated results of the hypothetical case ( Fig.…”

Section: Comparisons Of Simulated Results For 2d Versus Coupled 1d-2dmentioning

confidence: 99%

Point Cloud Data Fusion for Enhancing 2D Urban Flood Modelling

Meesuk¹

2017

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Although all care is taken to ensure the integrity and the quality of this publication and the information herein, no responsibility is assumed by the publishers, the author nor UNESCO-IHE for any damage to the property or persons as a result of operation or use of this publication and/or the information contained herein. A pdf version of this work will be made available as Open Access via http://repository.tudelft.nl/ihe This version is licensed under the Creative Commons Attribution-Non Commercial 4.0 International License, http://creativecommons.org/licenses/by-nc/4.0/Published by: CRC Press/Balkema PO Box 11320, 2301 EH Leiden, the Netherlands e-mail: Pub.NL@taylorandfrancis.com www.crcpress.com -www.taylorandfrancis.com to my dear family SummaryModelling urban flood dynamics requires detailed knowledge of a number of complex processes. Numerical simulation of flood propagation requires proper understanding of all processes involved. Also, special care has to be taken to adequately represent the urban topography, taking into account typical urban features like underpasses and hidden alleyways. Incorrect input data will affect the numerical model results, which may lead to inadequate flood-protection measures or even catastrophic flooding situations. This thesis explores how to include particular urban topographic features in urban flood modelling.Aerial Light Detection and Ranging (LiDAR) systems offer opportunities for achieving good quality topographic data, with less fieldwork on the ground. Even though aerial LiDAR data have long been used in many applications, conventional top-view LiDAR data can not quite capture some hidden urban features. However, recent improvements in Structure from Motion (SfM) techniques provide opportunities to achieve improved quality topographic data by using multiple viewpoints, including side-view data.This dissertation explores insights into the capabilities of assimilating SfM point cloud data by using multi-source views as input for enhancing 2D urban flood modelling. Side-view SfM point cloud data are collected and merged with conventional top-view LiDAR point cloud data to create novel Multi-Source Views (MSV) topographic data. The main objectives of this research are (i) to provide insight into the capabilities of using computer-based environments; (ii) to explore the benefits of using the new MSV data; (iii) to enhance 2D model schematizations; (iv) to compare simulated results using new MSV data and conventional top-view LiDAR data as input for urban flood models; and (v) to help developing flood-protection measures. Findings showed that simulation results using conventional top-view LiDAR-DSM as input show the least flood inundation areas and results contained many dry areas. This is because conventional LiDAR-DSM does not capture hidden urban features like underpasses, high trees, overarching structures, which behave as obstacles in 2D model schematics. When applying extended top-view LiDAR-DBM+ and the newly developed MSV-DEM as input, simulation results showed m...

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Section: Comparisons Of Simulated Results For 2d Versus Coupled 1d-2dmentioning

confidence: 99%

Point Cloud Data Fusion for Enhancing 2D Urban Flood Modelling

Meesuk¹

2017

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“…16, right). More information about the description of the test case can be found in Morales-Hernández et al (2015). Ammonium concentration (g/m For the simulation of this event, two numerical models are used: a fully 2D numerical model and the suggested coupled RCE 1D-2D model.…”

Section: Test Case 2: Tiber River Flooding With Solute Transportmentioning

confidence: 99%

A Riemann coupled edge (RCE) 1D–2D finite volume inundation and solute transport model

et al. 2015

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A novel 1D-2D shallow water model based on the resolution of the Riemann problem at the coupled grid edges is presented in this work. Both the 1D and the 2D shallow water models are implemented in a finite volume framework using approximate Roe's solvers that are able to deal correctly with wet/dry fronts. After an appropriate geometric link between the models, it is possible to define local Riemann problems at each coupled interface and estimate the contributions that update the cell solutions from the interfaces. The solute transport equation is also incorporated into the proposed procedure. The numerical results achieved by the 1D-2D coupled model are compared against a complete 2D model, which is considered the reference solution. The computational time is also examined.

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“…Compared with the pure 2D model, the coupled model not only maintains accuracy, but also dramatically decreases the computational time [8][9][10]. Most of coupled models use the 1D model in the river channel and 2D model in the floodplain to solve the river flood problem [2][3][4][5][11][12][13][14]. The other coupled models simulate urban drainage pipe network and river by 1D model and urban area by 2D model to solve the urban rain-flood problem [1,6,15,16].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation of River Closure Project

Lin

Jin

et al. 2020

Water

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The success or failure of river closure is directly related to the construction period and project benefit. Therefore, it is very necessary to study the river closure by an appropriate method. In this paper, a 1D–2D coupled river closure model is established to optimize the closure flow rate, closure period, and layout of a real closure project. The 1D transition model between open channel flow and pressurized flow is established by a finite volume scheme. For the 2D model, 2D shallow water equations are solved using an unstructured finite volume scheme. The 1D model and 2D model are coupled by considering the mass and momentum conservation. To validate the model, a physical experiment of a real river closure project is set up according to the gravity similarity criterion with a scale of 1:80. Then, the experimental data obtained by the calibrated physical experiment is compared with the numerical results. Good agreements are achieved in terms of surface elevation, velocity, and flow rate. Finally, the real river closure project is further investigated by the model. The layout, closure flow rate and closure period of this project is analyzed and optimized. The original design of the berm is more suitable to discharge the flow. Moreover, the first stage cofferdam should be removed to floor elevation upstream and downstream of the dam. The river closure flow rate should not exceed 2380 m3/s.

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Conservative 1D–2D coupled numerical strategies applied to river flooding: The Tiber (Rome)

Cited by 50 publications

References 31 publications

Point Cloud Data Fusion for Enhancing 2D Urban Flood Modelling

Point Cloud Data Fusion for Enhancing 2D Urban Flood Modelling

A Riemann coupled edge (RCE) 1D–2D finite volume inundation and solute transport model

Experimental and Numerical Investigation of River Closure Project

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