References of "Erpicum, Sébastien"
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See detailFloodplain Backwater Effect on Overtopping Induced Fluvial Dike Failure
Rifai, Ismail ULiege; El kadi Abderrezzak, Kamal; Erpicum, Sébastien ULiege et al

in Water Resources Research (in press)

Fluvial dikes (i.e. levees) can be damaged by overtopping flows, leading to breach formation and severe floods. Accurate prediction of the breach geometry and outflow hydrograph is crucial to achieve ... [more ▼]

Fluvial dikes (i.e. levees) can be damaged by overtopping flows, leading to breach formation and severe floods. Accurate prediction of the breach geometry and outflow hydrograph is crucial to achieve sound inundation risk assessment and mitigating measures. A set of laboratory experiments were performed to study overtopping induced fluvial dike breaching. The effects of floodplain tailwater on the breach expansion and outflow were investigated. Results are compared to previous experiments under different main channel inflow discharges combined with a free floodplain. The dike breaching process follows three stages: gradual start of overtopping and slow initiation of dike erosion, fast deepening and widening of the breach with highly transient flows, and flow quasi-stabilization with or without sustained breach expansion. Using the recorded data, a simplified regression model relating the breach stabilization time and the final breach width to the floodplain confinement and inflow Froude number in the main channel is proposed. [less ▲]

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See detailProcedural generation of flood-sensitive urban layouts
Mustafa, Ahmed Mohamed El Saeid ULiege; Zhang, Xiao Wei; Aliaga et al

in Environment and Planning B: Urban Analytics and City Science (in press)

Aside from modeling geometric shape, three-dimensional (3D) urban procedural modeling has shown its value in understanding, predicting and/or controlling effects of shape on design and urban planning. In ... [more ▼]

Aside from modeling geometric shape, three-dimensional (3D) urban procedural modeling has shown its value in understanding, predicting and/or controlling effects of shape on design and urban planning. In this paper, instead of the construction of flood resistant measures, we create a procedural generation system for designing urban layouts that passively reduce water depth during a flooding scenario. Our tool enables exploring designs that passively lower flood depth everywhere or mostly in chosen key areas. Our approach tightly integrates a hydraulic model and a parameterized urban generation system with an optimization engine so as to find the least cost modification to an initial urban layout design. Further, due to the computational cost of a fluid simulation, we train neural networks to assist with accelerating the design process. We have applied our system to several real-world locations and have obtained improved 3D urban models in just a few seconds. [less ▲]

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See detailTechnical note: An operational implementation of recursive digital filter for baseflow separation
Rammal, Mohamad ULiege; Archambeau, Pierre ULiege; Erpicum, Sébastien ULiege et al

in Water Resources Research (in press)

Baseflow estimation is of overwhelming importance in hydrological modelling and water resources management. One of the widely used techniques to derive baseflow from measured stream flow is the Recursive ... [more ▼]

Baseflow estimation is of overwhelming importance in hydrological modelling and water resources management. One of the widely used techniques to derive baseflow from measured stream flow is the Recursive Digital Filter (RDF). Yet its application still raises methodological issues related to the determination of its parameters. In this study, we propose a practical and automatic procedure to calibrate the RDF with respect to the measured stream flow. The method operationality and robustness are first demonstrated on three gauging stations in the Ourthe catchment (Belgium). The calibrated parameters compare well with those obtained by a standard graphical approach. Next, the proposed approach is compared to the technique of Conductance Mass Balance (CMB) for two gauging stations in the Hoyoux catchment (Belgium). A fair agreement between the results of the two techniques is obtained, suggesting that the proposed automatic calibration procedure of RDF takes the baseflow separation process to a higher level of practicality and transparency. [less ▲]

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See detailComparison of perturbation methods for rainfall and temperature data: case of a Belgian catchment
Peltier, Yann; Dewals, Benjamin ULiege; Erpicum, Sébastien ULiege et al

in International Journal of Hydrology Science and Technology (in press)

Analyses of hydrological impacts of climate change require appropriate methods for perturbing meteoric time-series to represent future climate conditions. Two readily available tools for perturbing ... [more ▼]

Analyses of hydrological impacts of climate change require appropriate methods for perturbing meteoric time-series to represent future climate conditions. Two readily available tools for perturbing rainfalls and temperatures are tested for a medium-sized catchment in Belgium. CCI-HYDR provides three scenarios, tailored for Belgium every decade until 2100. In contrast, KNMI-ADC tool provides 191 scenarios, at a regional level and for two horizons (near and far future). With its three contrasted scenarios of possible future climate conditions, CCI-HYDR is found suitable for forcing computationally intensive detailed hydrological models. With its broader spectrum of climate scenarios, KNMI-ADC tool is suitable for forcing multiple runs of fast conceptual hydrological models. As the two perturbation tools deliver stationary time-series, they are also compared to an alternate method producing transient time-series. Transient stochastic tools are particularly computationally demanding due to their stochastic nature, which is not optimal when combined with detailed distributed hydrological models. [less ▲]

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See detailOvertopping induced fluvial dike breaching: lessons from experimental and numerical studies
Rifai, Ismail; El kadi Abderrezzak, Kamal; Violeau, Damien et al

in Digues Maritimes et Fluviales de Protection contre les Inondations (2019)

Overtopping of fluvial dikes (i.e. levees) can promote breach formation and potentially brutal dike failure, leading to the inundation of the protected area. Flood risk management and prevention require a ... [more ▼]

Overtopping of fluvial dikes (i.e. levees) can promote breach formation and potentially brutal dike failure, leading to the inundation of the protected area. Flood risk management and prevention require a precise quantification of the hazard. Accurate estimate of the flow through the breach is paramount, for which a precise understanding of the breach formation and expansion is required. An experimental program was conducted to fill this gap by investigating the physical processes involved in overtopping induced fluvial dike gradual breaching. Experiments were conducted on two distinct experimental setups, each consisting of a main channel and floodplain area separated by an erodible fluvial dike. The focus was made to study overtopping induced spatial erosion of homogenous, non-cohesive dikes. Measurements included continuous scanning of the 3D dike geometry using a non-intrusive method (Laser Profilometry Technique), which was designed and developed specifically for the present works. Tests conducted under controlled flow and dike configurations allowed assessing the effects of channel inflow discharge and floodplain confinement on the breach development and outflow. Effects of dike material size, apparent cohesion, and bottom erodibility were studied as well. In the present paper, the most important findings are presented. Additionally, the flow and dike breaching were simulated using the two-dimensional depth-averaged code TELEMAC-2D. This allowed assessing the performance of a detailed morphodynamic code for dike breaching processes. [less ▲]

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See detailFormation de brèche dans les digues fluviales soumises aux surverses : apports de la modélisation expérimentale et numérique
Rifai, Ismail; El kadi Abderrezzak, Kamal; Violeau, Damien et al

in Digues 2019 - 3eme Colloque National sur les digues maritimes et fluviales de protection contre les inondations (2019)

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See detailEffects of spatial planning on future flood risks in urban environments
Mustafa, Ahmed Mohamed El Saeid ULiege; Bruwier, Martin ULiege; Archambeau, Pierre ULiege et al

in Journal of Environmental Management (2018), 225

Urban development may increase the risk of future floods because of local changes in hydrological conditions and an increase in flood exposure that arises from an increasing population and expanding ... [more ▼]

Urban development may increase the risk of future floods because of local changes in hydrological conditions and an increase in flood exposure that arises from an increasing population and expanding infrastructure within flood-prone zones. Existing urban land use change models generally consider the expansion process and do not consider the densification of existing urban areas. In this paper, we simulate 24 possible urbanization scenarios in Wallonia region (Belgium) until 2100. These scenarios are generated using an agent-based model that considers urban expansion and densification as well as development restrictions in flood-prone zones. The extents of inundation and water depths for each scenario are determined by the WOLF 2D hydraulic model for steady floods corresponding to return periods of 25, 50, and 100 years. Our results show that future flood damages and their spatial distributions vary remarkably from one urbanization scenario to another. A spatial planning policy oriented towards strict development control in flood-prone zones leads to a substantial mitigation of the increased flood damage. By contrast, a spatial planning policy exclusively oriented to infill development with no development restrictions in flood-prone zones would be the most detrimental in terms of exposure to flood risk. Our study enables the identification of the most sensitive locations for flood damage related to urban development, which can help in the design of more resilient spatial planning strategies and localize zones with high levels of flood risk for each scenario. [less ▲]

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See detailDimensional analysis for hydraulic modelling of urban flooding
Li, Xuefang ULiege; Erpicum, Sébastien ULiege; Mignot, Emmanuel et al

Report (2018)

This document conducts a dimensional analysis for the experimental models of urban flooding. It highlights the key parameters for the flow characteristics of urban flood. The experimental test program is ... [more ▼]

This document conducts a dimensional analysis for the experimental models of urban flooding. It highlights the key parameters for the flow characteristics of urban flood. The experimental test program is also defined. [less ▲]

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See detailImprovement of anisotropic porosity models with a merging technique
Bruwier, Martin ULiege; Archambeau, Pierre ULiege; Erpicum, Sébastien ULiege et al

in Proc. River Flow 2018 (2018, September)

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See detailNumerical study of the Martelange mine to be used as lower reservoir for constructing an Underground Pumped Storage Hydropower plant
Pujades, Estanis; Orban, Philippe ULiege; Archambeau, Pierre ULiege et al

in Advances in Geosciences (2018), 45

Underground Pumped Storage Hydropower (UPSH) using abandoned mines has been considered as a potential high capacity Energy Storage Systems. In UPSH plants, the excess of electricity is stored in the form ... [more ▼]

Underground Pumped Storage Hydropower (UPSH) using abandoned mines has been considered as a potential high capacity Energy Storage Systems. In UPSH plants, the excess of electricity is stored in the form of potential energy by pumping water from an underground reservoir (abandoned mine in this paper) to a surface reservoir, while electricity is produced (when the demand increases) discharging water from the surface into the underground reservoir. The main concerns may arise from the water exchanges occurring between the underground reservoir and the surrounding medium, which are relevant in terms of environmental impact and UPSH efficiency. Although the role of the water exchanges has been previously addressed, most studies are based on synthetic models. This work focuses on a real abandoned slate mine located in Martelange (Belgium). The effects of different rehabilitation works to prepare the mine as an underground reservoir are assessed in terms of groundwater exchanges and their associated consequences. [less ▲]

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See detailSupporting dataset for: "Floodplain Backwater Effect on Overtopping Induced Fluvial Dike Failure"
Rifai, Ismail; El kadi Abderrezzak, Kamal; Erpicum, Sébastien ULiege et al

Textual, factual or bibliographical database (2018)

Supporting data for the manuscript: "Floodplain Backwater Effect on Overtopping Induced Fluvial Dike Failure" Included in this repository the data used in: - Figure 2 : Longitudinal profiles at dike crest ... [more ▼]

Supporting data for the manuscript: "Floodplain Backwater Effect on Overtopping Induced Fluvial Dike Failure" Included in this repository the data used in: - Figure 2 : Longitudinal profiles at dike crest for Tests 3 and 14 - Figure 3 : Elevations of 3D reconstructions of dike breaching for Tests 2, 5, and 14 - Figure 4 : Selected longitudinal profiles of Tests 14, 2, 3, and 5 - Figure 5 : Time series of water levels, breach discharges, breach widths, and channel Froude numbers for Tests 14, 1, 2, 4, and 5 - Figure 6 : Elevations of final 3D reconstructions of dikes for Tests 14, 1, 2, 4, and 5 - Figure 7 : Time series of the breach widening and deepening. [less ▲]

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See detailDesign of experimental urban flood model
Li, Xuefang ULiege; Erpicum, Sébastien ULiege; Archambeau, Pierre ULiege et al

Conference (2018, June 11)

In this Master class, I presented the detailed design of the experimental model of my PhD research, including the model geometry design, laboratory setup and the measurement techniques. Useful discussions ... [more ▼]

In this Master class, I presented the detailed design of the experimental model of my PhD research, including the model geometry design, laboratory setup and the measurement techniques. Useful discussions were acheived for the model design, which confirms also the deep scientific interest of the PhD project. [less ▲]

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See detailExperimental and numerical modelling of fluvial dike breaching due to flow overtopping
Rifai, Ismail; El kadi Abderrezzak, Kamal; Violeau, Damien et al

in Armanini, Aronne; Nucci, Elena (Eds.) New challenges in hydraulic research and engineering (2018, June)

Laboratory experiments have been conducted to in-vestigate the breaching of fluvial dikes under flow overtopping conditions. The measurements have been used to assess the performance of a 2D depth ... [more ▼]

Laboratory experiments have been conducted to in-vestigate the breaching of fluvial dikes under flow overtopping conditions. The measurements have been used to assess the performance of a 2D depth-averaged model. [less ▲]

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See detailHydrodynamics of shallow reservoirs: recent advances
Dewals, Benjamin ULiege; Erpicum, Sébastien ULiege; Ferrara, Vélia et al

in Armanini, Aronne; Nucci, Elena (Eds.) New challenges in hydraulic research and engineering (2018, June)

The reliable prediction of the flow field in shallow reservoirs is crucial to guide the optimal design and operation of these structures. We highlight here configurations leading to bi-stable flow fields ... [more ▼]

The reliable prediction of the flow field in shallow reservoirs is crucial to guide the optimal design and operation of these structures. We highlight here configurations leading to bi-stable flow fields and we present a radically new, energy-based, approach to predict theoretically the flow fields. [less ▲]

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See detailA brief review of urban flood experimental models, with a focus on laboratory model at the district level
Li, Xuefang ULiege; Erpicum, Sébastien ULiege; Archambeau, Pierre ULiege et al

in Armanini, Aronne; Nucci, Elena (Eds.) New challenges in hydraulic research and engineering (2018, June)

This communication provides brief review of recent experimental research on urban flooding. It highlights the most studied research questions and proposes a classification of the various experimental ... [more ▼]

This communication provides brief review of recent experimental research on urban flooding. It highlights the most studied research questions and proposes a classification of the various experimental models. The communication will focus on models at the district level, and will identify knowledge gaps. [less ▲]

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See detailHow good are shallow water models at capturing the effect of small-scale obstacles on urban flooding in crossroads?
Bruwier, Martin ULiege; Archambeau, Pierre ULiege; Erpicum, Sébastien ULiege et al

in Armanini, Aronne; Nucci, Elena (Eds.) New challenges in hydraulic research and engineering (2018, June)

This paper reviews the accuracy of shallow water models to reproduce flow characteristics in flooded crossroads in the presence of a small-scale obstacle. In particular, we identify the potential benefit ... [more ▼]

This paper reviews the accuracy of shallow water models to reproduce flow characteristics in flooded crossroads in the presence of a small-scale obstacle. In particular, we identify the potential benefit of using a turbulence model or an anisotropic porosity-based model. [less ▲]

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See detailOperational method for assessing riverbed stability after (partial) dam removal on threshold channels: a case study in the Alps
Goffin, Louis ULiege; Archambeau, Pierre ULiege; Pirotton, Michel ULiege et al

in Armanini, Aronne; Nucci, Elena (Eds.) New challenges in hydraulic research and engineering (2018, June)

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See detailInfluence of urban pattern on inundation flow in floodplains of lowland rivers
Bruwier, Martin ULiege; Mustafa, Ahmed Mohamed El Saeid ULiege; Aliaga, Daniel G. et al

in Science of the Total Environment (2018), 622–623

The objective of this paper is to investigate the respective influence of various urban pattern characteristics on inundation flow. A set of 2,000 synthetic urban patterns were generated using an urban ... [more ▼]

The objective of this paper is to investigate the respective influence of various urban pattern characteristics on inundation flow. A set of 2,000 synthetic urban patterns were generated using an urban procedural model providing locations and shapes of streets and buildings over a square domain of 1 x 1 km². Steady two-dimensional hydraulic computations were performed over the 2,000 urban patterns with identical hydraulic boundary conditions. To run such a large amount of simulations, the computational efficiency of the hydraulic model was improved by using an anisotropic porosity model. This model computes on relatively coarse computational cells, but preserves information from the detailed topographic data through porosity parameters. Relationships between urban characteristics and the computed inundation water depths have been based on multiple linear regressions. Finally, a simple mechanistic model based on two district-scale porosity parameters, combining several urban characteristics, is shown to capture satisfactorily the influence of urban characteristics on inundation water depths. The findings of this study give guidelines for more flood-resilient urban planning. [less ▲]

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See detailExperimental study of ogee crested weir operation above the design head and influence of the upstream quadrant geometry
Erpicum, Sébastien ULiege; Blancher, B.; Peltier, Yann et al

in Proc. 7th International Symposium on Hydraulic Structures (2018, May)

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See detailUrban flood risk & spatial planning
Dewals, Benjamin ULiege; Bruwier, Martin ULiege; Archambeau, Pierre ULiege et al

Scientific conference (2018, April 10)

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