Influences of the environment of a wind farm on the forecasts of its power generation using models GFS (50km/3h) and WRF (2km/15min) : The case study of Amel wind farm (High Belgium)

peer reviewedThe economic and climate contexts require to use more electricity from wind farms. However this kind of production is intermittent, therefore it is necessary to forecast this resource at least 1 day ahead. Our laboratory has developed a forecasting model of wind-based electricity generation based on a global meteorological model (GFS) with a resolution of 50 km and 3 h. But this model has a resolution too coarse for a wind farm. So we have configured the regional model WRF with resolution of 2 km and 15 min to obtain better forecasts. Finally, the WRF model provides better forecasts, but both must be adjusted to take into account the direct environment of the wind farm

Ingénierie des constructions hydrauliques: tendances, points d'attention et besoins

Hydraulic structures are critical for water management, but face evolving societal challenges and changing environmental conditions. In this context, hydraulic structures engineering needs to evolve. This talk presents the IAHR HSTC point of view on current trends, concerns, and needs related to hydraulic structures engineering as well as a forward-looking framework that is grounded on the evolution of interconnected research tools and methodologies in addition to emphasizing and bolstering strong links between academia and industry. It is anticipated that in this way the hydraulic structures community will make a new step toward more sustainable and resilient interactions with nature and between communities in water management.6. Clean water and sanitation7. Affordable and clean energy9. Industry, innovation and infrastructure13. Climate actio

Modélisation combinée pour améliorer l'étude des structures hydrauliques

peer reviewedaudience: researcher, professionalPhysical modeling and numerical modeling are two efficient analysis approaches in hydraulic engineering. The interactive application of both methods is obviously the more effective response to most flow problems analyses. Indeed, it enables combining the inherent advantages of both approaches, which are complementary, while being beneficial to the delays as well as the quality of the analysis. The paper presents the way composite modeling is applied for years at the HECE - Laboratory of Engineering Hydraulics (University of Liege) to enhance hydraulic structures studies. Besides numerical model validation for which experimental benchmarks constitute the first reliable data source, simultaneous application of both modeling approaches may be envisaged in three different ways. Composite modeling may be used to increase the scale factor of physical models by reducing the layout of the real structure to be modeled, to provide a better answer to specific problems than a single approach study or to maximize the efficiency of experimental tests by reducing the range of variation of the unknown parameters to be tested. For each of these three issues depicted in the paper, several examples show how the combined use of efficient numerical solvers together with physical scale models enables to increase the overall quality and scope of the analyses while decreasing the delays and possibly the costs

A systematic procedure to predict flows induced by major dysfunctions on complexes or cascades of dams

peer reviewedHazard analysis of dams arranged in complex or in cascade may involve the assessment of a large number of different scenarios of combined failures. However, a tremendous computation time would be needed to perform a detailed modeling of the flows generated by all possible scenarios. Therefore, the present paper describes a rational methodology for analyzing the flows induced by the most relevant incidents occurring on a complex or in a cascade of dams and reservoirs. The methodology combines several hydrodynamic models, including the twodimensional flow solver WOLF 2D and a simplified lumped hydrodynamic model, to simulate (i) the flows induced on the dams complex, (ii) the potential breaching in cascade of other dams, as well as (iii) the propagation of the flood wave in the whole downstream valley. The application of the methodology to a practical case study involving a complex of five dams is also described

Experimental investigation of the effect of flip bucket splitters on plunge pool geometry

peer reviewedFlip buckets are common hydraulic structures aiming at deflecting high velocity flows to a free jet trajectory. Systematic experimental tests have been performed to assess the influence on energy dissipation and the plunge pool geometry of varied repartitions of splitters along the flip bucket width. In particular, it is shown that some configurations can create more erosion than a continuous channel without flip bucket.Ski-Sprünge sind übliche Strukturen in Wasserbau, entworfen um Wasser in eine Freiwurfflugbahn mit hoher Geschwindigkeit zu lenken. Die Splitter sind manchmal auf des Ski-Sprünge installiert um die Energiedissipation zu verbessern und damit des Gefahr des Erosion zu reduzieren. In systematischer Weise wurden experimentelle Untersuchungen durchgeführt, um den Einfluss der Strömungsteiler auf die Geometrie des Tosbeckens zu analysieren. Aufgrund der Tosbecken-Geometrie wurde eine Klassifizierung von verschiedenen Konfigurationen von Strömungsteilern durchgeführt und Empfehlungen für eine effiziente Gestaltung erarbeitet. Insbesondere wird gezeigt, dass bestimmte Strömungsteiler Geometrien erheblich mehr Erosion produzieren als ein Ski-Sprung ohne Teiler

Automatic geometrical optimization by way of numerical flow models

peer reviewedThe potentialities in numerical flow modeling available today allow performing more and more representative and accurate computations of an increasing part of hydraulic engineering practical problems. In some cases, numerical simulation can be used as an alternative, or at least an efficient pre-design tool, to more classic physical modeling. In this framework, the paper presents the application of integrated numerical tools to the automatic optimization of the geometry of a guide-wall at the entrance of a channel. The simulations have been performed by using a Genetic Algorithm based optimization tool coupled to a 2D free surface flow model. This finite volume multibock flow solver, WOLF2D, solves the conservative form of the classical shallow water equations together with a depth-integrated k-ε type turbulence model. The calculations have been performed on a cluster of 12 processors to reach a satisfactory solution in less than 2.5 days (96 solutions tested). On the basis of the numerical results and of the value of the suitability indicators, the optimal solution is objectively better than the other tested geometries. This confirms the efficiency of the automatic optimization procedure

Handling very different time scales in numerical modelling of sediment transport and morphodynamics

peer reviewedaudience: researcher, professional, studen

A modeling system handling the wide range of time scales involved in sediment transport processes

peer reviewe