References of "Archambeau, Pierre"
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See detailHydraulic modelling along river Ourthe
Dewals, Benjamin ULg; Detrembleur, Sylvain ULg; Archambeau, Pierre ULg et al

Conference (2007, June 01)

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See detailSensitivity analysis of the peak outflow induced by the breaching of embankment dams
Dewals, Benjamin ULg; Archambeau, Pierre ULg; Erpicum, Sébastien ULg et al

in Rutschmann, Peter (Ed.) Berichte des Lehrstuhls und der Versuchanstalt für Wasserbau und Wasserwirtschaft (2007)

Accurately predicting the flow induced by the collapse of embankment dams remains challenging, as a consequence of the level of uncertainty affecting the prediction of breach width and formation time ... [more ▼]

Accurately predicting the flow induced by the collapse of embankment dams remains challenging, as a consequence of the level of uncertainty affecting the prediction of breach width and formation time. Moreover, very few systematic analyses are available today concerning the sensitivity of the flow with respect to those uncertainties. The present theoretical analysis quantifies the influence of variations in the breach parameters on the peak outflow. [less ▲]

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See detailAnalysis and application of two complementary numerical models for predicting flood waves generated by failures or dysfunctions occuring on a complex of dams
Dewals, Benjamin ULg; Erpicum, Sébastien ULg; Archambeau, Pierre ULg et al

in Proceedings of the 32nd IAHR Biennial Congress - Harmonizing the demands from art and nature (2007)

A complete risk analysis related to a complex of dams may involve the assessment of a large number of different scenarios of failures and dysfunctions. However, a high computation time would be needed to ... [more ▼]

A complete risk analysis related to a complex of dams may involve the assessment of a large number of different scenarios of failures and dysfunctions. However, a high computation time would be needed to perform a two-dimensional analysis of the flows generated by all possible scenarios. For this reason, the present paper expounds two complementary flow models, developed to be exploited within a rational methodology for analysing the flows induced by various incidents on a complex of dams and reservoirs. The first model is the two-dimensional flow solver WOLF 2D, while the second one is a simplified lumped model, requiring very low computation time. An original analytical study is presented to demonstrate the conditions of applicability of the lumped model. This study leads to the practical conclusion that the evaluation of two non-dimensional parameters enables to assess a priori the validity of the simplified approach for any specific application. The paper also describes the combined application of both models to a practical case study involving a complex of five dams. In a first step the lumped model has been validated by comparisons with the results provided by the two-dimensional model WOLF 2D. Secondly the simplified model has been successfully applied, at a very low CPU cost, to simulate flows induced by various dysfunctions and to conduct sensitivity analysis. In conclusion, based on both theoretical developments and numerical studies, the paper provides new advances of practical relevance for dam break risk analysis. [less ▲]

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See detailHétérogénéité des échelles spatio-temporelles d’écoulements hydrosédimentaires et modélisation numérique
Dewals, Benjamin ULg; Erpicum, Sébastien ULg; Archambeau, Pierre ULg et al

in Articles du colloque Transports solides et gestion des sédiments en milieux naturels et urbains (2007)

The numerical models for flow and sediment transport must be able to handle properly the wide range of space- and time-scales relevant for the processes to be modelled. For this purpose different levels ... [more ▼]

The numerical models for flow and sediment transport must be able to handle properly the wide range of space- and time-scales relevant for the processes to be modelled. For this purpose different levels of numerical coupling between the flow solver and the sediment transport model must be considered. Besides a short review of the mathematical background, the present paper describes the modelling system WOLF, developed at the University of Liege and enabling to handle the vast majority of time scales characterizing practical applications of flows with sediment transport, by means of specific numerical techniques. The applicability of the modelling system is demonstrated based on several examples of simulations related to the design and the operation of a large hydroelectric project in India. [less ▲]

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See detailDam rehabilitation study with process oriented numerical flow models
Erpicum, Sébastien ULg; Archambeau, Pierre ULg; Detrembleur, Sylvain ULg et al

in Proceedings of the 5th International Conference on Dam Engineering (2007)

In the global framework of climate change, hydraulic structures rehabilitation is an up-to-date subject requiring appropriate design and impact studies. In this scope, upgrading the release facilities of ... [more ▼]

In the global framework of climate change, hydraulic structures rehabilitation is an up-to-date subject requiring appropriate design and impact studies. In this scope, upgrading the release facilities of dams is an important point when both up and downstream consequences, often irreversible, of badly controlled rising of water in the reservoir, become awarded. Suitable numerical models, coupled with contemporary computational possibilities, allow engineers to forecast the complex situations induced on real structures by extreme events with increasing representativeness and accuracy. In this field, WOLF software, a process oriented free surface flows computation package completely set up by the HACH, has proved its efficiency and reliability for years by numerous theoretical, experimental as well as on real structures applications. In this paper, the rehabilitation study of the Nisramont dam (Belgium) is presented. Due to its temporary primary tasks, the stilling basin downstream of the crest spillway has been designed for a short time use. It’s the same with the 3 bottom outlets, which were never equipped with valves and are thus unusable for the reservoir management. In order to secure the structure and to make it comply with its definitive working objectives, while taking into account climate change observations, the HACH has been entrusted with evaluating up to date critical flood discharges and with designing a system in accord with these new values for the rehabilitation of the bottom outlets and the evacuation of the floods. Several construction options have been compared and optimized by means of the hydrodynamic software WOLF. [less ▲]

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See detailExperimental and numerical study of the breaching of an embankment dam
Dupont, E.; Dewals, Benjamin ULg; Archambeau, Pierre ULg et al

in Proceedings of the 32nd IAHR Biennial Congress - Harmonizing the demands from art and nature (2007)

In the framework of the study of the collapse of an embankment dam following its overtopping, an experimental study of the progressive breaching of such a dam has been performed. The present laboratory ... [more ▼]

In the framework of the study of the collapse of an embankment dam following its overtopping, an experimental study of the progressive breaching of such a dam has been performed. The present laboratory tests enable to validate and to complete a numerical approach previously studied by the authors. The two-dimensional analysis of the breaching is carried out on a scale model in a flume. A cross-section of a dam is scaled according to proper similarity rules, both for the flow and for the solid transport. The originality of the approach lies in the interaction between the experimental and numerical work. The experiments on the scale model are filmed in order to determine the time evolution of the dam profiles. The cross sections are extracted from the films and analyzed by an image-processing algorithm specifically developed for this application. These results are integrated into the hydrodynamic model WOLF2D, which computes the flow generated by the given transient topography and eventually supplies the relevant hydraulic parameters characterizing the dam breaching. [less ▲]

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See detailHydraulique Appliquée
Pirotton, Michel ULg; Archambeau, Pierre ULg; Erpicum, Sébastien ULg et al

Learning material (2007)

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See detailReservoirs to mitigate flood events on the River Ourthe in Belgium
Erpicum, Sébastien ULg; Archambeau, Pierre ULg; Detrembleur, Sylvain ULg et al

in Proceedings of the 75th Annual Meeting of the International Committee on Large Dams (2007)

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See detailSimulations MOHICAN pour la statistique des débits maxima (projet STATHY) : bassins de la Warchenne, la Wamme et la Gueule
Deliège, Jean-François ULg; Bourouag, Mohamed ULg; Smitz, Joseph ULg et al

Report (2006)

Le modèle MOHICAN (« Modèle hydrologique intégré pour le calcul des crues et l’amplitude des niveaux d’eau ») a été développé conjointement par l’Université de Liège (Laboratoire d’hydrodynamique ... [more ▼]

Le modèle MOHICAN (« Modèle hydrologique intégré pour le calcul des crues et l’amplitude des niveaux d’eau ») a été développé conjointement par l’Université de Liège (Laboratoire d’hydrodynamique appliquée, Laboratoire de Géologie de l’Ingénieur et d’Hydrogéologie, Centre d’Etude et de Modélisation de l’environnement) et la Faculté Universitaire des Sciences Agronomiques de Gembloux (Unité d’Hydraulique agricole) pour le compte et avec le support du Ministère de l’Equipement et des Transports, Service d’Etudes Hydrologiques (MET/SETHY) de la Région wallonne. Dans le cadre du projet STATHY visant à établir la cartographie des zones d’inondation en région Wallonne, il était nécessaire de disposer de séries étendues de débits horaires pour chaque sous-bassin versant. Le modèle MOHICAN a été utilisé à la demande du SETHY pour générer ces données sur 14 années (1991 à 2004) pour 3 sous-bassins pour lesquels la Région Wallonne ne disposait pas de données horaires suffisantes : • La Warchenne à Malmédy (+/- 29 km²), • La Wamme à Hargimont (+/- 81 km²), • La Gueule à Sippenaeken (+/- 120 km²). [less ▲]

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