http://hdl.handle.net/2268.2/6043 Sat, 11 Apr 2026 20:32:47 GMT 2026-04-11T20:32:47Z http://hdl.handle.net/2268.2/19562 Title: Comparison of flood zones and evaluation of water depths of buildings for the flood of July 2021 in the Vesdre watershed Abstract: This master thesis addresses the mapping of flood extents and water depths in the Vesdre watershed, Wallonia, in response to unprecedented floods in July 2021. The study emphasizes the significance of comparing outcomes from a sophisticated 2D model (WOLF2D) with a simplified conceptual approach implemented by the SPW, which involves superimposing diverse data sources. The SPW cartography integrates digitalisation primarily based on aerial photos and a modeling created with an inverse distance weighting interpolation utilizing water depths from buildings measured by SPW employees. The comparison, facilitated by coefficients of correlation considering the size of evaluated wet and dry areas, reveals satisfactory global and local similarities at the Vesdre watershed scale. However, notable discrepancies emerge, particularly in highly urbanized areas where WOLF exhibits complexity, and in rural areas distant from measured water depths for the SPW modeling. This modeling tends to overestimate flood extents and water depths globally, struggling with dynamic flood effects and relying predominantly on topography. In Verviers, the complexity of the built-up environment contributes to poor correlation coefficients. Indicators comparing measured water depths of SPW buildings and WOLF-simulated water depths demonstrate varying results. A nuanced analysis, adjusting parameters such as minimal water depth consideration, zone dimensions around buildings, and riverbed inclusion, permits a closer alignment of the WOLF water depths with the on-site measurements. Pepinster and Eupen both located on a confluence of two important streams present results with high errors. Lastly, through a literature review of 0D methods also called simple conceptual approaches compared to 2D models, the results of SPW modeling are considered quite favorable. Thu, 25 Jan 2024 23:00:00 GMT http://hdl.handle.net/2268.2/19562 2024-01-25T23:00:00Z http://hdl.handle.net/2268.2/16747 Title: Analysis of clogging of bridges during Liège 2021 flood events Abstract: Création et analyse d'une base de données des ponts obstrués par les inondations survenant à Liège en juillet 2021 Thu, 26 Jan 2023 23:00:00 GMT http://hdl.handle.net/2268.2/16747 2023-01-26T23:00:00Z http://hdl.handle.net/2268.2/16746 Title: Optimizing downstream migration of Atlantic salmon smolts at Mery site Abstract: La dévalaison des smolts de saumon atlantique est entravée par diverses constructions utilisées principalement pour la production d'électricité ou à des fins de navigation dans les cours d'eau. Cette thèse contribue à l'optimisation de la dévalaison des smolts de saumon atlantique à un site de production d'énergie hydroélectrique à Mery, Belgique, en utilisant un modèle numérique du site et en réalisant différentes simulations. Le chapitre 1 propose une introduction à la thématique de dévalaison et donne un aperçu de la procédure de travail. Le chapitre 2 évoque l'état de l'art sur le comportement des smolts, des paramètres hydrodynamiques favorisant la migration et donne un aperçu des recherches effectuées sur la migration des smolts à ce site précis. Le chapitre 3 décrit le site ainsi que le modèle numérique utilisé pour cette thèse et accentue les problèmes rencontrés à Mery par rapport à la dévalaison des smolts. Le chapitre 4 présente les résultats des différentes étapes de simulation à partir d'une analyse de base sur l'influence de l'ouverture des incisions et l'exécution de différentes constructions hydrauliques comme des guides de flux ou des changements topographiques. Différentes combinaison de constructions avec différentes combinaison des incisions sont ensuite testées. Enfin, une comparaison des 3 combinaisons les plus performantes sous 3 scénarios de débit différents est donnée. Ce chapitre aborde également d'autres points à considérer pour l'optimisation d'un site de production hydroélectrique pour la dévalaison. Finalement le chapitre 5 conclut l'ensemble des observations faites, propose des solutions pour améliorer le comportement migratoire vers l'aval et mentionne des perspectives d'amélioration. La meilleure des méthodes en termes de paramètres hydrauliques favorisant la migration des smolts vers l'aval est un déplacement du chenal. La meilleure méthode globale pour le site de Mery est la construction d'un grillage a bars à l'entrée du canal d'admission de la turbine Kaplan combinée avec une incision profonde à côté qui fonctionne comme un bypass. Thu, 26 Jan 2023 23:00:00 GMT http://hdl.handle.net/2268.2/16746 2023-01-26T23:00:00Z http://hdl.handle.net/2268.2/16271 Title: Flood damage estimation: knowledge gained from field surveys Abstract: Flooding has been increased significantly in all over the world from the past few years because of the climate change and economic losses due to flooding have been increased more significantly from the last few decades. It is necessary to estimate the flood losses in the domain of flood risk management and to adopt the best practices for the collection, storage, and analysis of the flood damage data in order to develop the risk mitigation strategies for the severe flood events. In this study, one of the best practices has been presented for the collection and estimation of the flood damage data of the residential buildings through field surveys. In this regard, the study was divided into two phases: (1) introduction of the pilot study for the understanding of real field conditions, identifying the strengths and weaknesses in the survey questionnaire, and improving the field strategy; and (2) organization of the detailed study based on the previous experience of the pilot study and conducting field surveys on a large scale by adopting improved field strategy through a well-structured paper-based survey questionnaire. Through field surveys, the data for socio-demographic characteristics and damage information including building features, hazard variables, building damage cost, building damage extend, financial compensation, precautionary measures, and warning systems of the population was collected. The collected flood damage data was encoded in the Moodle and the python script was used for decoding any errors between encoding and verification phases based on a timestamp and mostly graphs were generated based on readily available python scripts. The analysis and the interpretations of the graphs have been done for developing the relationships and dependencies between different variables and building features and conclusions have been drawn at the end of this study. Sun, 04 Sep 2022 22:00:00 GMT http://hdl.handle.net/2268.2/16271 2022-09-04T22:00:00Z