References of "Ernst, Julien"
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See detailMicro-scale flood risk analysis based on detailed 2D hydraulic modelling and high resolution geographic data
Ernst, Julien ULg; Dewals, Benjamin ULg; Detrembleur, Sylvain ULg et al

in Natural Hazards (2010), 55(2), 181-209

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. Consequently, the outcomes of hydraulic modelling constitute suitable inputs for the subsequent exposure analysis, performed at a micro-scale using detailed land use maps and geographic database. Eventually, the procedure incorporates social flood impact analysis and evaluation of direct economic damage to residential buildings. Besides detailing the characteristics and performance of the hydraulic model, the paper describes the flow of data within the overall flood risk analysis procedure and demonstrates its applicability by means of a case study, for which two different flood protection measures were evaluated. [less ▲]

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See detailIntegrated flood risk analysis for assessing flood protection strategies
Ernst, Julien ULg; Dewals, Benjamin ULg; Detrembleur, Sylvain ULg et al

in Tagelsir, Gasmelseid (Ed.) Handbook of Research on Hydroinformatics: Technologies Theories and Applications (2010)

The present chapter describes an end-to-end methodology for assessing flood protection strategies, including the whole methodological process from hydrological statistics to detailed 2D hydraulic ... [more ▼]

The present chapter describes an end-to-end methodology for assessing flood protection strategies, including the whole methodological process from hydrological statistics to detailed 2D hydraulic modelling, damage calculation and flood risk evaluation. This risk-based approach serves as a component of a decision-support system (DSS) developed in Belgium for identifying cost-effective flood management strategies in the context of climate change. The DSS accounts for both hydraulic and socio-economic parameters to quantify the benefits (in terms of avoided risk) and the cost of each strategy. Besides reviewing fundamentals of flood risk assessment, including the inundation model and main concepts related to flood risk, a consistent methodology for micro-scale flood risk analysis is presented in detail, combining complementary sources of GIS information such as high resolution and high accuracy land use database as well as socio-economic datasets. Finally a case study on a main tributary of river Meuse in Belgium is described. [less ▲]

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See detailFlood Protection Design Based on Micro-scale Risk Modelling
Ernst, Julien ULg; Dewals, Benjamin ULg; Detrembleur, Sylvain ULg et al

Poster (2010, April 22)

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

in Risque d'Inondation en Ile de France, 100 ans après les crues de 1910 (2010, March)

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See detailADAPT - Towards an Integrated Decision Tool for Adaptation Measures - Case study: Floods
Giron, Eve; Coninx, Ingrid; Dewals, Benjamin ULg et al

Report (2010)

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See detailA risk-based approach for designing climate-proof flood protection
Ernst, Julien ULg; Dewals, Benjamin ULg; Detrembleur, Sylvain ULg et al

Poster (2009, June 12)

In the framework of the Belgian national research project “ADAPT - Towards an integrated decision tool for adaptation measures”, a risk-based decision-support system (DSS) is developed with the aim of ... [more ▼]

In the framework of the Belgian national research project “ADAPT - Towards an integrated decision tool for adaptation measures”, a risk-based decision-support system (DSS) is developed with the aim of selecting the most cost-effective flood protection strategies. Based on detailed 2D hydraulic modelling combined with high resolution and high accuracy land use database as well as socio-economic datasets, integrated risk analysis is conducted to evaluate the benefits of different flood protection measures. The tool is dedicated to the integrated evaluation of flood management strategies in the context of increased flood risk as a result of climate change, considering hydraulic, economic, social as well as environmental parameters to quantify both the benefits (in terms of avoided risk) and the cost of each strategy. While such risk analyses are mostly undertaken at a macro- or meso-scale, the present approach is performed at a micro-scale, meaning that the considered assets are the individual buildings or facilities. The methodology relies on a consistent approach in terms of accuracy of input data, hydraulic modelling and expected results. Indeed, besides detailed hydraulic modelling conducted on computational grids as fine as 2m by 2m, exploited data include laser altimetry (LIDAR), high resolution and high quality land use maps as well as other complementary vector geographic datasets providing socioeconomic information at a micro-scale. Next to the flow modelling and the exposure analysis conducted for each building or facility individually, the procedure involves social impact analysis (accounting for social vulnerability and adaptive capacity of communities) and the evaluation of direct economic damage based on different relative damage functions. The outcomes of this risk analysis are subsequently exploited in the DSS to evaluate the effectiveness of individual flood protection measures. Finally all costs and benefits (avoided risk) are combined to enable the evaluation of flood protection strategies. Every scenario for which benefits outweigh costs potentially adds to welfare. The scenario with the highest contribution per Euro invested should ideally be realised first. The extended cost-benefit analysis is complemented by uncertainty and sensitivity analyses of the results. The applicability of the overall automatic procedure is demonstrated by the evaluation of inundation hazard, exposure and flood risk for a case study along river Ourthe in the Meuse basin (Belgium). For validation purpose, recent flood events are first simulated and a base scenario is considered. Next, the effectiveness of a number of flood protection measures is evaluated. [less ▲]

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See detailPlanning flood risk reducing measures based on combined hydraulic and socio-economic impact modelling at a micro-scale
Ernst, Julien ULg; Coninx, Ingrid; Dewals, Benjamin ULg et al

in Christodoulou, S. E. (Ed.) Proc. 7th Int. Conf. on Water Resources Conservancy and Risk Reduction Under Climatic Uncertainty (2009, June)

Risk management is currently shifting from the full protection against flooding towards the management of the consequences of flooding. To reduce these consequences, micro-scale analysis is compelled. In ... [more ▼]

Risk management is currently shifting from the full protection against flooding towards the management of the consequences of flooding. To reduce these consequences, micro-scale analysis is compelled. In addition to the hydraulic modelling of the inundation flow, nearby land use and vulnerability of elements-at-risk are taken into consideration. This new approach requests an interdisciplinary collaboration of scientists from hydraulic and social science, as is the case for this paper. The research teams have developed a methodology to evaluate socio-economic consequences of flooding based on the analysis at the micro-scale of the flood characteristics, the exposure and the vulnerability of elements-at-risk and the adaptive capacity of society. The hydrodynamic simulations are conducted by means of 2D flow modelling run on a highly accurate Digital Surface Model - DSM with a resolution of 2 by 2 meters. The two-dimensional modelling provides high resolution flood maps detailing the distribution of water depth and flow velocity field in the floodplains, which constitute key inputs for the subsequent flood risk analysis. The methodology will be illustrated for a case study along River Ourthe, which is the main tributary of River Meuse in Belgium, for selecting and designing flood protection measure. The geographic data in this area are available at a resolution consistent with the conducted micro-scale risk analysis. They include data on social vulnerability coming from the most recent socio-economic national survey (NIS). [less ▲]

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See detailDetailed 2D hydraulic modelling as a support for selecting adaptation measures
Ernst, Julien ULg; Dewals, Benjamin ULg; Detrembleur, Sylvain ULg et al

in Schüttrumpf, Holger (Ed.) Wasserwirtschaft und Klimawandel - Fakten, Folgen und Aufgaben (2009)

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See detailSocial Flood Impacts in Urban Areas: Integration of Detailed Flow Modelling and Social Analysis
Ernst, Julien ULg; Coninx, Ingrid; Dewals, Benjamin ULg et al

in Proc. 33rd IAHR Congress: Water Engineering for a Sustainable Environment (2009)

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See detailDam-break flow numerical modeling considering structural impacts on buildings
Erpicum, Sébastien ULg; Archambeau, Pierre ULg; Dewals, Benjamin ULg et al

in Proc. 33rd IAHR Congress: Water Engineering for a Sustainable Environment (2009)

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See detailDam Break Flow Modelling and Geographical Distribution of the Roughness Coefficient
Paulus, Raphaël ULg; Ernst, Julien ULg; Dewals, Benjamin ULg et al

in Proc. 33rd IAHR Congress: Water Engineering for a Sustainable Environment (pp. 2429-2436) (2009)

Dam break flow modelling is a major field of research. In order to enable risk analysis in the downstream valleys of dams, 2D numerical simulations are of prime interest. These are based on the ... [more ▼]

Dam break flow modelling is a major field of research. In order to enable risk analysis in the downstream valleys of dams, 2D numerical simulations are of prime interest. These are based on the conservative set of shallow water equations. Beyond their numerical implementation, the challenge of the computation relies on the ability to handle very huge sets of high-precision data, in order to get the highest possible accuracy, whereas the computational time must remain realistic for simulations carried out on real valleys topography. In this paper, a simulation on about 2 500 000 cells is presented. Particularly, the results are compared and discussed regarding especially the exploitation of landuse data for the roughness. Beyond the examples of validation, the relevance of the developed methodology appears to be essential in the framework of risk analysis. [less ▲]

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See detailEffect of climate change on flood risk along river Ourthe
Dewals, Benjamin ULg; Ernst, Julien ULg

Conference (2008, November 12)

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See detailEffect of climate change on flood risk along river Ourthe
Dewals, Benjamin ULg; Ernst, Julien ULg; Pirotton, Michel ULg

Conference (2008, November 12)

Detailed reference viewed: 13 (3 ULg)