References of "Detrembleur, Sylvain"
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See detailRelative impacts of climate and landuse changes on future flood damage along River Meuse in Wallonia
Beckers, Arnaud ULg; Detrembleur, Sylvain ULg; Dewals, Benjamin ULg et al

Poster (2012, April 27)

Climate change is expected to increase flood hazard across most of Europe, both in terms of peak discharge intensity and frequency. Consequently, managing flood risk will remain an issue of primary ... [more ▼]

Climate change is expected to increase flood hazard across most of Europe, both in terms of peak discharge intensity and frequency. Consequently, managing flood risk will remain an issue of primary importance for decades to come. Flood risk depends on territories’ flood hazard and vulnerability. Beside climate change, land use evolution is thus a key influencing factor on flood risk. The aim of this research is to quantify the relative influence of climate and land use changes on flood damage evolution during the 21st century. The study focuses on River Meuse in Wallonia for a 100-year flood. A scenario-based approach was used to model land use evolution. Nine urbanization scenarios for 2100 were developed: three of them assume a “current tend” land use evolution, characterized by urban sprawl, while six others assume a sustainable spatial planning, leading to an increase in density of residential areas as well as an increase in urban functions diversity. A study commissioned by the EU has estimated a 30 % increase in the 100-year discharge for River Meuse by the year 2100. Inundation modeling was conducted for the present day 100-year flood (HQ100) and for a discharge HQ100 + 30%, using the model Wolf 2D and a 5m grid resolution Digital Elevation Model (Ernst et al. 2009). Based on five different damage curves related to land use categories, the relative damage was deduced from the computed inundation maps. Finally, specific prices were associated to each land use category and allowed assessing absolute damages, which were subsequently aggregated to obtain a damage value for each of the 19 municipalities crossed by River Meuse. Results show that flood damage is estimated to increase by 540 to 630 % between 2009 and 2100, reaching 2.1 to 2.4 billion Euros in 2100. These increases mainly involve municipalities downstream of a point where the floodplain width becomes significantly larger. The city of Liège, which is protected against a 100-year flood in the present situation, would undergo about 450 million Euros damage for a 100-year flood in the 2100, i.e. in-between 21% and 25 % of the whole damage increase. The influence of climate is three to eight times higher than the effect of land use change according to the land use evolution scenarios considered. Nevertheless, these two factors have a comparable influence on seven municipalities. Consequently, although a careful spatial planning would not considerably reduce the overall flood damage at the level of theWalloon part of the Meuse Valley, more sustainable spatial planning could efficiently reduce future flood damage at the level of several most critical municipalities. Reference Ernst, J, Dewals, B, Detrembleur, S, Archambeau, P, Erpicum, S, & Pirotton, M. (2010). Micro-scale flood risk analysis based on detailed 2D hydraulic modelling and high resolution geographic data. Natural Hazards, 55(2), 181-209. [less ▲]

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See detailBenefit of using flood risk analysis at the micro level for evaluating local protection measures
Dewals, Benjamin ULg; Detrembleur, Sylvain ULg; Archambeau, Pierre ULg et al

Conference (2012, April 23)

In numerous river basins, climate projections converge towards conditions leading to a significant increase in peak discharges both in terms of intensity and frequency. Therefore, managing flood risk will ... [more ▼]

In numerous river basins, climate projections converge towards conditions leading to a significant increase in peak discharges both in terms of intensity and frequency. Therefore, managing flood risk will remain an issue of primary importance. Besides, it is currently shifting from the search for full protection against flooding towards the management of the impacts of flooding. In this respect, the elaboration of effective flood management strategies should rely on an integrated risk-based approach, encompassing not only hydraulic criteria but also economic, social and environmental factors. In addition, the considered level of detail in the analysis should be relevant given the available data and the expected outcomes. While such risk analyses have so far been mostly undertaken at a macro- or meso-scale, the herein described analysis is performed at a micro-scale, meaning that the considered assets are the individual buildings, parcels or facilities. [less ▲]

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See detailAMICE: erste internationale Modellrechnung der Maas
Becker, Bernhard; Patzke, Simone; Detrembleur, Sylvain ULg et al

in Forum für Hydrologie und Wasserbewirtschaftung (2012, March 22), 12(31), 165-170

Im Rahmen des AMICE-Projektes wurde eine erste zusammenhängende internationale Modellrechnung für den gesamten Flusslauf der Maas inklusive des Nebenflusses Rur durchgeführt. Dazu wurden die in den ... [more ▼]

Im Rahmen des AMICE-Projektes wurde eine erste zusammenhängende internationale Modellrechnung für den gesamten Flusslauf der Maas inklusive des Nebenflusses Rur durchgeführt. Dazu wurden die in den Anrainerstaaten Frankreich, Belgien, Deutschland und der Niederlande vorgehaltenen numerischen Modelle verwendet. Die Randbedingungen dieser Modelle wurden in einem iterativen Prozess abgeglichen. Die Ergebnisse der zusammenhängenden Simulation tragen zunächst zu einem besseren Systemverständnis bei. Im weiteren Verlauf des Projektes fließen sie in eine Risikobetrachtung ein und werden zur Bewertung von Maßnahmen zur Reduzierung des Hochwasserrisikos vor dem Hintergrund zu erwartender Änderung der Bemessungsgrößen infolge einer erwarteten Klimaänderung herangezogen. [less ▲]

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See detailModèles d'écoulements incompressibles en plan vertical appliqués aux structures du génie civil
Detrembleur, Sylvain ULg

Doctoral thesis (2012)

Le travail entrepris s’intègre complètement dans la filière d’étude propre au HACH, à savoir une interaction étroite entre modèles numériques et validation sur bases d’éléments issus de la modélisation ... [more ▼]

Le travail entrepris s’intègre complètement dans la filière d’étude propre au HACH, à savoir une interaction étroite entre modèles numériques et validation sur bases d’éléments issus de la modélisation physique. Les hypothèses restrictives du modèle intégré sur la hauteur (WOLF2D) ont été gommées par l’ajout de deux nouveaux modules permettant de calculer explicitement la distribution des variables hydrodynamiques sur la hauteur de l’écoulement. L’utilisation intensive du code bidimensionnel horizontal et les modélisations diverses et variées menées au moyen de ce module ont conduit à de nombreuses implémentations nouvelles dans ce code, permettant de traiter un nombre grandissant de situations complexes. L’utilisation d’un maillage structuré, même différentiable spatialement au moyen d’une technique multiblocs, ne permet cependant pas à l’utilisateur de représenter adéquatement certaines géométries complexes. Il ressort de ce constat que les techniques numériques à même de supprimer cette dépendance ont fait l’objet d’une partie de cette recherche, en permettant l’utilisation de contours quelconques qui ne respectent pas nécessairement la structure cartésienne du maillage. Ces développements ont tout naturellement conduit à la modélisation d’interactions de structures solides sur le fluide. D’autre part, le grand nombre de modèles hydrodynamiques spécifiques implémentés dans le code WOLF2D trahissent une volonté d’intégrer les variations verticales des composantes hydrodynamiques agglomérées par l’intégration sur la hauteur. Ces distributions peuvent, certes, être maîtrisées dans une certaine mesure, mais ne peuvent en aucun cas reproduire la dynamique complexe qui est observée dans la direction d’intégration de ce type de modèle. Par conséquent, la partie principale des recherches entreprises dans cette thèse est concentrée sur le développement d’un modèle bidimensionnel explicitement discrétisé sur la verticale (WOLF2DV) qui permet de combler le manque d’informations distribuées induit lors de l’élaboration d’un modèle bidimensionnel horizontal. L’obtention de ces informations a cependant un coût, puisque la structure et la technique de résolution du système d’équations est différente des modèles intégrés sur la hauteur ou sur la section et engendre des coûts de calcul supplémentaires. Afin de conserver la philosophie générale de la suite logicielle WOLF, qui se veut polyvalente et efficace même sur de grandes applications réelles, un effort considérable a été consenti lors de l’évaluation des techniques de résolution et de leur implémentation et ce, afin de conserver des temps de calcul acceptables. En outre, la volonté de s’affranchir de la discrétisation sur des maillages structurés transparaît également au niveau des recherches entreprises pour ce code explicitement discrétisé sur la verticale puisqu’un second challenge important a consisté en l’élaboration d’une technique de suivi d’interface adaptée. Finalement, les résultats probants et prometteurs fournis ont amené tout naturellement à étendre ce module bidimensionnel vers la troisième dimension et à ainsi représenter explicitement un écoulement tridimensionnel (WOLF3D). Compte tenu de la lourdeur de développement dans la troisième dimension, ce module est limité aux écoulements sous pression et constitue la base de recherches futures qui viseront à adjoindre à ce code une gestion de surface libre ou encore des modèles de turbulence. [less ▲]

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See detailTransboundary assessment of the effect of climate change on river Meuse: flood wave selection for hydraulic modelling from Ampsin (B) to Maaseik (NL)
Dewals, Benjamin ULg; Detrembleur, Sylvain ULg; Becker, Bernhard et al

in Proc. 2nd IAHR Europe Congress: Water - infinitely deformable but still limited (2012)

This paper addresses high resolution inundation modelling in a transboundary context. In particular, flood wave propagation and inundation characteristics are simulated over a stretch of almost 100 km of ... [more ▼]

This paper addresses high resolution inundation modelling in a transboundary context. In particular, flood wave propagation and inundation characteristics are simulated over a stretch of almost 100 km of river Meuse across the Belgian-Dutch border, using 2D fully dynamic modelling. This transboundary hydraulic simulation requires inflow hydrographs to be prescribed as upstream boundary conditions. However, existing procedures for generating flood wave hydrographs differ between the concerned regions. Therefore, we review the main characteristics of the existing regional procedures and compare the resulting synthetic hydrographs. Besides, transnational hydrological scenarios have been developed to investigate the impact of climate change on flood risk along river Meuse in both countries. [less ▲]

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See detailOn the advantage of using risk curves to assess flood protection measures
Dewals, Benjamin ULg; Detrembleur, Sylvain ULg; Archambeau, Pierre ULg et al

in Mambretti, Stefano (Ed.) Environmental Risk (2012)

Modern flood management approaches require the quantification of flood risk, accounting for the hazard component (flood frequency and inundation intensity) as well as the vulnerability of the floodplains ... [more ▼]

Modern flood management approaches require the quantification of flood risk, accounting for the hazard component (flood frequency and inundation intensity) as well as the vulnerability of the floodplains (exposure, value and susceptibility). In this chapter, we present a detailed flood risk model, in which flow computation, monetary valuation of the assets and damage calculation are conducted at the scale of individual buildings or facilities. To avoid the shortcoming of focusing on economic damage, psycho-social impacts of floods are also included in the analysis. The model has been applied to evaluate three flood protection measures on a river reach in the Meuse basin (Belgium). The resulting risk curves show that such a micro-scale risk analysis provides important insights into the relative influence of the different flood protection measures. This could neither be evaluated through a more standard hydraulic analysis nor through the quantification of flood risk by only a single number. [less ▲]

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See detailFlood risk analysis in the Meuse river basin
Gouverneur, Ludovic ULg; Dewals, Benjamin ULg; Detrembleur, Sylvain ULg et al

in Urban Flood Risk Management (2011, September 21)

The goal of the study presented in the paper consists in understanding the vulnerability of economic systems to a modification of the hydrology due to climate change in the Meuse river basin. The latter ... [more ▼]

The goal of the study presented in the paper consists in understanding the vulnerability of economic systems to a modification of the hydrology due to climate change in the Meuse river basin. The latter extends over several regions in four different countries. A transnational approach is thus necessary to keep consistency throughout the international catchment. In this paper, we begin by illustrating how a strong collaboration between scientists and water authorities of the different parts of the basin has lead to a consistent approach for conducting flood risk analysis. Hazard modeling was conducted to get flood maps in the whole basin, considering various climate scenarios. In Wallonia, accurate hydraulic simulations were performed with the fully dynamic flow model WOLF2D entirely developed at the University of Liege (Erpicum et al., 2010). The outcomes of this inundation modeling constitute suitable inputs for the subsequent exposure analysis. The latter has been performed at a meso-scale using land use maps (CORINE) and geographic database (PLI), aggregated into a set of five damage categories. Recently developed damage functions, which are the key part of the vulnerability analysis, has been chosen in relation with the damage categories indentified in the exposure analysis. To determine the value of the assets, a monetary approach has been employed, with the purpose of assessing prices per square meter for each damage category. In this paper, the focus is set on comparing several approaches to calculate the specific price of the residential damage category in Wallonia, and to compare with an existing micro-scale approach (Ernst et al., 2010). [less ▲]

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See detailDepth-averaged flowslides model: validation and application to tailings dams and waste dumps failures
Dewals, Benjamin ULg; Archambeau, Pierre ULg; Detrembleur, Sylvain ULg et al

in Chanson, Hubert (Ed.) Proc. of the 34th IAHR World Congress: Balance and Uncertainty: Water in a Changing World (2011)

Flowslides induced by the failure of tailing dams or waste dumps constitute significant industrial hazards. Examples in the past have demonstrated their high potential for casualties and damage ... [more ▼]

Flowslides induced by the failure of tailing dams or waste dumps constitute significant industrial hazards. Examples in the past have demonstrated their high potential for casualties and damage. Geotechnical analyses provide nothing more than the failure criteria. In contrast, once the structure fails, the fluidized material propagates rapidly as a non-Newtonian flow, requiring thus a hydraulic analysis. This paper presents an advanced 2D depth-averaged flow model which accommodates the particular rheology of flowslides, including visco-plasticity and frictional behavior accounting for pore pressure. Based on mass and momentum conservation for the mixture of soil and interstitial fluid, the finite volume model handles flow propagation on dry areas and includes an original treatment of the yield stress in 2D. At a crossroads of geotechnical and hydraulic engineering, the paper depicts the elaboration and validation of a new model readily available for hazard mapping, including extent of affected areas, maximum depths and arrival time. [less ▲]

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See detailCaractérisation micro-échelle du risque d’inondation : modélisation hydraulique détaillée et quantification des impacts socio-économiques
Dewals, Benjamin ULg; Detrembleur, Sylvain ULg; Archambeau, Pierre ULg et al

in Houille Blanche (2011), (2), 28-34

The paper presents a consistent micro-scale flood risk analysis procedure, relying on detailed 2D inundation modelling as well as on high resolution topographic and land use database. The flow model is ... [more ▼]

The paper presents a consistent micro-scale flood risk analysis procedure, relying on detailed 2D inundation modelling as well as on high resolution topographic and land use database. The flow model is based on the shallow-water equations, solved by means of a finite volume scheme on multiblock structured grids. Using highly accurate laser altimetry, the simulations are performed with a typical grid spacing of 2m, which is fine enough to represent the flow at the scale of individual buildings. The methodology is first described, both in terms of hydraulic modelling and evaluation of people and assets vulnerability. The analysis scale of the procedure enables its development following an object-oriented approach. Finally, the applicability of the procedure is demonstrated through a case study for which three different protection measures are evaluated. Detailed analysis of these measures highlights significantly different influences from those measures on the risk curves. [less ▲]

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See detailFailure of dams arranged in series or in complex
Dewals, Benjamin ULg; Erpicum, Sébastien ULg; Detrembleur, Sylvain ULg et al

in Natural Hazards (2011), 56(3), 917-939

A practical methodology has been developed for predicting flows generated by dam failures or malfunctions in a complex or a series of dams. A twofold approach is followed. First, the waves induced in the ... [more ▼]

A practical methodology has been developed for predicting flows generated by dam failures or malfunctions in a complex or a series of dams. A twofold approach is followed. First, the waves induced in the downstream reservoirs are computed, as well as hydrodynamic impacts induced on downstream dams and dikes are estimated. Second, the flood wave propagation and the inundation process are simulated in the downstream valley, accounting for possible dam collapse or breaching in cascade. Two complementary flow models are combined: a two-dimensional fully dynamic model and a simplified lumped model. At each stage, the methodology provides guidelines to select the most appropriate model for efficiently computing the induced flows. Both models handle parametric modeling of gradual dam breaching. The procedure also incorporates prediction of breach formation time and final width, as well as sensitivity analysis to compensate for the high uncertainties remaining in the estimation of breach parameters. The applicability of the modeling procedure is demonstrated for a case study involving a 70m-high gravity concrete dam located upstream of four other dams. [less ▲]

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See detailIncorporating climate change scenarios into new operating rules for large reservoirs: a transnational assessment in the Meuse basin
Dewals, Benjamin ULg; Detrembleur, Sylvain ULg; Archambeau, Pierre ULg et al

in Schleiss, Anton (Ed.) Dams and Reservoirs under changing Challenges (2011)

Opportunities for updating and optimizing current operating rules are being evaluated for the Vesdre reservoirs in Belgium (50 M m³) and the Rur complex in Germany (300 M m³). This assessment is conducted ... [more ▼]

Opportunities for updating and optimizing current operating rules are being evaluated for the Vesdre reservoirs in Belgium (50 M m³) and the Rur complex in Germany (300 M m³). This assessment is conducted transnationally at the scale of the Meuse river basin. Common methodological approaches are followed in both countries and operating rules are analyzed in light of common climate change scenarios, recently defined for the whole Meuse basin. Similar risk-based approaches are used consistently in both countries to evaluate the performance of new operating rules in terms of risk reduction for floods and low flows. [less ▲]

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See detailImpact of Climate change on inundation hazard along river Meuse
Dewals, Benjamin ULg; Detrembleur, Sylvain ULg; Archambeau, Pierre ULg et al

Conference (2010, December 16)

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See detailFlood risk analysis in Wallonia: micro (and meso-)scale approaches
Dewals, Benjamin ULg; Detrembleur, Sylvain ULg; Archambeau, Pierre ULg et al

Conference (2010, October 25)

Flood risk analysis has been undertaken in Wallonia in the framework of several national and international research projects. The analysis relies on a micro-scale procedure, which involves • hazard ... [more ▼]

Flood risk analysis has been undertaken in Wallonia in the framework of several national and international research projects. The analysis relies on a micro-scale procedure, which involves • hazard modelling by means of detailed 2D inundation modelling • as well as processing of high resolution topographic and land use database for vulnerability modelling. The inundation modelling is conducted using the fully dynamic flow model WOLF 2D, entirely developed at the University of Liege. The model is run on a highly accurate DEM resulting from the combination of laser altimetry and, when available, sonar bathymetry. The typical grid spacing for the simulations is kept as low as 2m, which is definitely fine enough to represent the complex flows occurring at the scale of individual buildings and streets in urbanized floodplains. In this way, both the static and dynamic impacts of the flow may be characterized for all affected assets. This approach has been extensively applied since 2003 to issue inundation maps throughout the Walloon region based on detailed 2D flow modelling. Consequently, the outcomes of such detailed inundation modelling constitute suitable inputs for the subsequent exposure analysis, performed at a micro-scale using detailed land use maps and geographic database. Eventually, based on a multidisciplinary work, the procedure may incorporate social flood impact analysis and evaluation of direct economic damage to different categories of buildings and land types. Besides detailing the characteristics and performance of the hazard modelling, the presentation will describe the flow of data within the overall risk analysis procedure and will demonstrate its applicability by means of a case study, for which three different flood protection measures have been evaluated. These include rehabilitation of an old canal, recalibration of a floodplain as well as heightening of a protection wall by means of mobile dikes. The risk-oriented analysis of these flood protection measures has lead to findings which would not have arisen from a more standard hydraulic study such as based on a design flood. The flood risk analysis procedure is now readily available for large scale applications throughout the hydrographic basins in Wallonia and, in the near future, it will be combined with catchment modelling (accounting for climate change projections) to evaluate upstream flood mitigation measures as well as for the fine tuning of reservoir management rules in the framework of adaptation strategies to climate change. [less ▲]

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