References of "Dewals, Benjamin"
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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 detailFlow field in shallow reservoir with varying inlet and outlet position
Ferrara, Velia; Erpicum, Sébastien ULiege; Archambeau, Pierre ULiege et al

in Journal of Hydraulic Research (in press)

Shallow reservoirs are used for multiple purposes, such as storm water retention and trapping of sediments. Reliable predictions of the flow fields are necessary to inform the design and operation of ... [more ▼]

Shallow reservoirs are used for multiple purposes, such as storm water retention and trapping of sediments. Reliable predictions of the flow fields are necessary to inform the design and operation of these structures. Using numerical simulations, we performed a systematic analysis of the influence of the location of the inlet and outlet on the flow fields developing in rectangular shallow reservoirs of various sizes. Depending on the relative location of the inlet and outlet with respect to the reservoir centreline, contrasting flow patterns are obtained, involving either no flow reattachment, or a jet reattached on either of the reservoir sidewalls. The results reveal also the occurrence of bi-stable flow configurations, i.e. different steady state flow fields are reached depending on the flow history. This is of high relevance for the design of shallow reservoirs as such configurations should certainly be avoided to achieve a robust hydraulic sizing of the reservoir. [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 detailNumerical Simulation of lateral dike breaching due to overtopping
Dewals, Benjamin ULiege; Rifai, Ismail; El-Kadi Abderrezak, Kamal et al

in River Flow 2018 (2018, September)

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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 building drag dissipation for- mulations in the integral porosity shallow water model
Özgen, Ilhan; Bruwier, Martin ULiege; Zhao, Jiaheng et al

in Proc. River Flow 2018 (2018, September)

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See detailFormation, breaching and flood consequences of a landslide dam near Bujumbura, Burundi
Nibigira, Léonidas ULiege; Havenith, Hans-Balder ULiege; Archambeau, Pierre ULiege et al

in Natural Hazards and Earth System Sciences (2018), 18

This paper investigates the possible formation of a landslide dam on the Kanyosha River near Bujumbura, the capital of Burundi, as well as the interplay between the breaching of this landslide dam and the ... [more ▼]

This paper investigates the possible formation of a landslide dam on the Kanyosha River near Bujumbura, the capital of Burundi, as well as the interplay between the breaching of this landslide dam and the flooding along the river. We present an end-to-end analysis, ranging from the origin of the landslide up to the computation of flood waves induced by the dam breaching. The study includes three main steps. First, the mass movement site was investigated with various geophysical methods that allowed us to build a general 3D model and detailed 2D sections of the landslide. Second, this model was used for dynamic landslide process modelling with the Universal Distinct Element Code. The results showed that a fifteen-meter-high landslide dam may form on the river. Finally, a 2D hydraulic model was setup to find out the consequences of the breaching of the landslide dam on flooding along the river, especially in an urban area located downstream. Based on 2D maps of maximum water depth, flow velocity and wave propagation time, the results highlight that neglecting the influence of such landslide dams leads to substantial underestimation of flood intensity in the downstream area. [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 detailDoes Coriolis force influence the flow in shallow reservoirs?
Dewals, Benjamin ULiege

E-print/Working paper (2018)

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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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See detailDoes urban flood resilience compete with sustainable urban planning as a whole?
Bruwier, Martin ULiege; Mustafa, Ahmed Mohamed El Saeid ULiege; Archambeau, Pierre ULiege et al

in Geophysical Research Abstracts (2018, April), 20

Sustainable urban planning aims at designing the urban fabric so that it meets the needs of an expanding urban population, while synergistically addressing a number of environmental objectives such as ... [more ▼]

Sustainable urban planning aims at designing the urban fabric so that it meets the needs of an expanding urban population, while synergistically addressing a number of environmental objectives such as transport, energy and resource efficiency. Urban densification is a key concept in sustainable urban planning, as it contributes to reduce pressure on environmentally sensitive lands and it makes several services more efficient, including water and energy supply. Similarly, at a local level, intervening spaces in-between buildings should be minimized to enhance heating efficiency. In this communication, we will report on two recent studies focusing on urban flood resilience. Both of them suggest that flood-resilient urban design tends to conflict with the two aforementioned aspects of sustainable urban development. The first study was conducted at the regional level, covering the whole Walloon Region in Belgium (17,000 km2). First, an original agent-based model was used to generate multiple urbanization scenarios with contrasting assumptions on spatial planning policies: urban expansion (sprawl) vs. urban densification, various degrees of ban on new developments in flood-prone areas . . . Next, flood damage modelling was performed along over 1,300 km of river. The results show that the urban densification scenarios lead to systematically higher flood risk estimates, since they promote new developments in the vicinity of existing urban areas mainly located in the lower parts of the river valleys. In a second study, conducted at the district level, we investigated how inundation severity is affected by the arrangement of buildings in floodplains . A set of 2,000 building layouts were synthetized using procedural modelling (Bruwier et al., 2018). Each building layout is characterized by a set of parameters such as the typical street widths, building size . . . Next, the flow characteristics (water depth, flow velocity) were computed for each building layout considering the same flooding scenario. An original porosity-based model was set up for this purpose (Bruwier et al., 2017). The findings of the study reveal that increasing the separation space in-between buildings tends to improve flood-resilience at the district level, thanks to an increased flow conveyance across the urban area. At first sight, the conclusions inferred from the two studies focusing on flood-resilience only (higher future flood risk due to urban densification, benefit of keeping intervening space in-between buildings) seem to diverge from general good-practice in sustainable urban planning. We intend to use this provocative statement to foster discussion with the audience on issues such as: “How can more integrated approaches mitigate such apparent contradictions?”, “How to best modulate sustainable urban planning principles to accommodate urban flood resilience?” [less ▲]

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