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See detailDe Dakconstructie van de Karmelietenkerk, eerste dendrochronologische analyse
Hoffsummer, Patrick ULiege; Houbrechts, David

in Stadsarcheologie (1993), 17(2), 29-34

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See detailDalhem - Herve: notice explicative de la carte géologique de la Wallonie
Barchy, Laurent ULiege; Marion, Jean-Marc ULiege

Book published by Ministère de la Région wallonne, DGRNE (2000)

New geological map of Wallonia published at the scale of 1/25.000, based on a new field work and using scientific data produced since the previous edition of Forir published in 1896 at the scale of 1/40 ... [more ▼]

New geological map of Wallonia published at the scale of 1/25.000, based on a new field work and using scientific data produced since the previous edition of Forir published in 1896 at the scale of 1/40.000 by the "Commission Géologique de Belgique". [less ▲]

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See detailDaljit Nagra: Sourires de tigre et dents brunes
Munos, Delphine ULiege

Article for general public (2012)

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See detailDalla spada alla penna. La scrittura del capitano Lorenzo Adami nelle lettere alla Regina Cristina di Svezia e al cardinale Azzolino
Aresti, Alessandro ULiege; Nigrisoli Wärnhjelm, Vera

in Perché scrivere: motivazioni, scelte, risultati. Atti del Convegno Internazionale di Olomouc (in press)

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See detailDalle porte della città... : l' esperienza con i rom di via Sesia
Mescoli, Elsa ULiege; Biondi, Claudia; Trezzi, Marco

Report (2008)

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See detailDalle sabbie all’apparato. Riflessioni su due recenti contributi alla Storia della Tradizione di Livio e Sallustio
Scappaticcio, Maria Chiara ULiege

in Athenaeum : Studii Periodici di Letteratura e Storia (2013), (II),

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See detailDam and irrigation scheme and water governance regime, case study Nam Mang3 Hydropower Project, Lao PDR
Kouangpalath, Phimthong ULiege

in M-Power (Ed.) Mekong Program on Water, Environment and Resilience (M-POWER) (2013)

A multi-purpose project involving hydropower and irrigation schemes Nam Mang3 Hydropower Project is one of trans-basin diversion scheme in 18 hydropower dams in operation in Laos and only project included ... [more ▼]

A multi-purpose project involving hydropower and irrigation schemes Nam Mang3 Hydropower Project is one of trans-basin diversion scheme in 18 hydropower dams in operation in Laos and only project included electricity production and irrigation scheme. But, the project has caused number of negative impacts for farmer especially in downstream or Recipient River (Nam Nyam and Houay Hong Pheng). This study aims to understand the water governance regime related between dam and irrigation scheme in order to find alternatives and to mitigate as much as possible the negative impact downstream of the dam, especially villages along the Nam Nyam valley or Napheng plain directly concerned water releases and benefit from irrigation. We used the key informant and focus group survey with various stakeholders of Nam Mang irrigation scheme and field work observation. The findings show that farmer can grow a second season of rice production and other agricultural activities, but due to the electricity generation in raining season this causes a big flood of rice fields along the Nam Nyam valley. Sometime farmer in irrigated area do not have enough water for irrigation during dry season for rice production downstream of NM3 and Nam Nyam irrigation schemes, because of low precipitation in dry season and the water is stored for generating electricity. Also there is weak governance between the dam operator and TSC-NM3 office. Overall, the project has contributed to, rather than diminishing, poverty of people and increase socio differential in the area. The study recommends a review of governance arrangements in negotiation of the operating regime for the dam, which does not seem to have been done in a transparent way, making it difficult to take into account the multiple benefits and costs to different stakeholders in such a water diversion project. So the ownership in charge of dam operation and irrigation scheme have to create a dialogue by assistance from development partners or upper government to find best alternative to mitigate negative impacts in downstream areas. Also to push the dam operators for compensation to farmers to seek new activities or livelihood activities and provide the annual budget for operation cost and maintenance irrigation scheme in good statue. [less ▲]

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See detailDam Break Flow Modelling and Geographical Distribution of the Roughness Coefficient
Paulus, Raphaël ULiege; Ernst, Julien ULiege; Dewals, Benjamin ULiege 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 detailDam break flow modelling with uncertainty analysis
Dewals, Benjamin ULiege; Archambeau, Pierre ULiege; Erpicum, Sébastien ULiege et al

Conference (2011, November)

The failure of a large dam may result in catastrophic floods in the downstream valley. However, past experience has revealed that loss of life and damage can be drastically reduced if crisis management is ... [more ▼]

The failure of a large dam may result in catastrophic floods in the downstream valley. However, past experience has revealed that loss of life and damage can be drastically reduced if crisis management is planned in advanced, including early-warning systems, organized communication and structural measures. This requires a fairly good knowledge of the inundation characteristics likely to be induced in case of a failure. Predictions of flood waves induced by dam failure are affected by a considerable level of uncertainty. Due to the extreme nature of such events, numerical models can hardly be calibrated and validated. Flow resistance parameterizations are designed for ranges of flow properties which significantly differ from those occurring during dam break flows. Large amounts of debris may also be transported by the flow and the details of the failure scenario remain usually unknown, such as sequence of dislodgement of dam wall fragments or breach formation time (e.g., Dewals et al. 2011). Nonetheless, most dam break flow studies so far have been conducted without systematic uncertainty nor sensitivity analyses. This is partly due to the high computational cost of the multidimensional flow models used to simulate dam break flows on natural topography. We present here the simulation of a real dam break flow with a systematic analysis of the uncertainty resulting from the roughness coefficient, the failure hydrograph and topographic data. The flow simulations have been conducted with the model WOLF 2D developed at the University of Liege. It solves the fully dynamic shallow-water equations based on a finite volume scheme and a self-developed flux-vector splitting (Erpicum et al. 2010a; Erpicum et al. 2010b). Monte-Carlo simulations have been used to perform the uncertainty analysis. The two-dimensional flow model is computationally too costly to perform a high number of repeated runs, as needed for Monte Carlo simulations. Therefore, a “reduced complexity model” has been set up, in the form of multidimensional Hermite polynomials. The method developed by Isukapalli et al. (Isukapalli et al. 2004) indicates the number of simulations of the complete model needed to calibrate the polynomials, as well as the parameter values to be used in these calibration runs. The methodology has been tested for a real dam break which occurred in Spain in 1982 (Alcrudo and Mulet 2007) and for which a number of observations are available (mainly maximum water depths at different locations in a town). The presentation will show the applicability and efficiency of the methodology, which is readily available for real-world analyses. Such uncertainty analysis for dam break flows disclose crucial information for practical risk management. In particular, they reveal that the uncertainty ranges on maximum water depth and time of arrival of the front are not symmetric (overestimation vs. underestimation) and very unevenly distributed in space. [less ▲]

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See detailDam break flow modelling with uncertainty analysis
Dewals, Benjamin ULiege; Erpicum, Sébastien ULiege; Pirotton, Michel ULiege et al

in Gourbesville, Philippe; Cunge, Jean; Caignaert, Guy (Eds.) Advances in Hydroinformatics (2013)

Handling uncertainties in dam break flow modelling is of primary interest. Therefore, a procedure is presented here to conduct systematic analysis of the uncertainties resulting from the roughness ... [more ▼]

Handling uncertainties in dam break flow modelling is of primary interest. Therefore, a procedure is presented here to conduct systematic analysis of the uncertainties resulting from the roughness coefficient, the breaching hydrograph and topographic data. The flow simulations have been conducted with the model WOLF 2D developed at the University of Liege. This two-dimensional flow model is computationally too costly to perform a high number of repeated runs, as needed for Monte Carlo simulations. Therefore, a “reduced complexity model” has been set up, in the form of multidimensional Hermite polynomials. This method, developed by Isukapalli et al. (2004) and first applied to dam break flow by Niemeyer (2007), involves a reduced number of runs of the complete model to calibrate the polynomials. This paper shows the applicability and efficiency of the methodology, but it also discusses previously unreported shortcomings of the approach, together with hints to overcome them. Results of such uncertainty analysis for dam break flow modelling disclose crucial information for practical risk management. In particular, they reveal that the uncertainty ranges on maximum water depth and time of arrival of the front are not symmetric (overestimation vs. underestimation) and very unevenly distributed in space. [less ▲]

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See detailDam rehabilitation study with process oriented numerical flow models
Erpicum, Sébastien ULiege; Archambeau, Pierre ULiege; Detrembleur, Sylvain ULiege 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 detailDam treatment with insulin-like growth factor-I monoclonal antibodies induce an alteration of fetal development
Renaville, Robert ULiege; Devolder, Anne; Sneyers, Myriam et al

in Archives Internationales de Physiologie, de Biochimie et de Biophysique (1992), 100

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See detailDam-break flow computation based on an efficient flux-vector splitting
Erpicum, Sébastien ULiege; Dewals, Benjamin ULiege; Archambeau, Pierre ULiege et al

in Journal of Computational & Applied Mathematics (2010), 234

Dam-break flow computation is a task of prime interest in the scope of risk analysis processes related to dams and reservoirs. In this paper, a 2D finite volume multiblock flow solver, able to deal with ... [more ▼]

Dam-break flow computation is a task of prime interest in the scope of risk analysis processes related to dams and reservoirs. In this paper, a 2D finite volume multiblock flow solver, able to deal with natural topography variation, is presented in details. The model is based on an efficient Flux Vector Splitting method developed by the authors. A number of validation examples are comprehensively described. [less ▲]

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See detailDam-break flow computation using high resolution DEM
Dewals, Benjamin ULiege

Conference (2008, May 26)

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See detailDam-break flow computation using high resolution DEM
Erpicum, Sébastien ULiege; Dewals, Benjamin ULiege; Archambeau, Pierre ULiege et al

in Hogge, Michel; Van Keer, R.; Noels, L. (Eds.) et al Proceedings of the 4th International Conference on Advanced Computational Methods in Engineering (2008)

Dam-break flow computation is a task of prime interest in the scope of risk analysis processes related to dams and reservoirs. High resolution Digital Elevation Models (DEMs) available today provide ... [more ▼]

Dam-break flow computation is a task of prime interest in the scope of risk analysis processes related to dams and reservoirs. High resolution Digital Elevation Models (DEMs) available today provide extremely dense and accurate topography information in the valley downstream of these structures, even in urban area. In this paper, a 2D finite volume flow solver, able to deal with these DEMs, is presented in details. Validation examples are comprehensively described. [less ▲]

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

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

Detailed reference viewed: 33 (2 ULiège)