References of "Archambeau, Pierre"
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See detailShallow-water models with anisotropic porosity and merging for flood modelling on Cartesian grids
Bruwier, Martin ULiege; Archambeau, Pierre ULiege; Erpicum, Sébastien ULiege et al

in Journal of Hydrology (2017)

Shallow-water models with porosity are used to compute floods at a relatively coarse resolution while accounting indirectly for detailed topographic data through porosity parameters. In many practical ... [more ▼]

Shallow-water models with porosity are used to compute floods at a relatively coarse resolution while accounting indirectly for detailed topographic data through porosity parameters. In many practical applications, these models enable a significant reduction of the computational time while maintaining an acceptable level of accuracy. In this paper, we improve the use of porosity models on Cartesian grids by three original contributions. First, a merging technique is used to handle cells with low porosity values which tend otherwise to seriously hamper computational efficiency. Next, we show that the optimal method for the determination of the porosity parameters depends on the modelling scale, i.e. the grid resolution compared to the characteristic size of obstacles and flow ways. Finally, we investigate the potential benefit of using a different porosity parameter in each term of the shallow-water equations. Five test cases, two of them being original, are used to validate the model and assess each contribution. In particular, we obtained speedup values between 10 and 100 while the errors on water depths remain around few percent. [less ▲]

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See detailUnderground pumped hydroelectric energy storage in Wallonia (Belgium) using old mines - Hydraulic modelling of the reservoirs
Erpicum, Sébastien ULiege; Archambeau, Pierre ULiege; Dewals, Benjamin ULiege et al

in Aminuddin, Ab. Ghani (Ed.) Proceedings of the 37th IAHR World Congress (2017)

Pumped Storage Hydroelectricity (PSH) is a well-known and efficient technology to store and release various amounts of electricity. To overcome the problem of available land surface to create new ... [more ▼]

Pumped Storage Hydroelectricity (PSH) is a well-known and efficient technology to store and release various amounts of electricity. To overcome the problem of available land surface to create new reservoirs, an alternative consists in using underground volumes to build so-called Underground Pumping Storage Hydroelectricity (UPSH) plants. A research project is currently investigating the feasibility of such UPSH plants in Wallonia (Belgium) using abandoned mines and underground quarries. The paper presents the main features of this multidisciplinary project and focuses on the numerical models developed specifically to consider the reservoirs’ hydraulics. Indeed, the detailed prediction of the water mass movements in the reservoirs is a key element of a feasibility analysis, as they may affect the turbomachines operation as well as the solicitations of the reservoirs limits. On the other hand, such prediction is challenging because of the complex geometry, the continuous discharge variations and the possible exchanges with the surrounding soil or the interaction with air in underground reservoirs. The application of the hydraulic model to an abandoned slate quarry highlights the usefulness of the approach and also its limitations. [less ▲]

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See detail15 years of composite modelling to enhance hydraulic structures studies
Erpicum, Sébastien ULiege; Dewals, Benjamin ULiege; Archambeau, Pierre ULiege et al

in SimHydro 2017: choosing the right model in applied hydralilcs (2017)

Physical and numerical modelling may be combined within so-called composite or hybrid modelling. This enables to taking optimal benefit of the respective strengths of each modelling approach, while ... [more ▼]

Physical and numerical modelling may be combined within so-called composite or hybrid modelling. This enables to taking optimal benefit of the respective strengths of each modelling approach, while compensating for their specific drawbacks. Different types of composite modelling may be identified, such as embedding a detailed physical model within a broader scale numerical model, interconnecting different physical and numerical models focusing each on specific processes, or validating a numerical model from experimental data before exploiting the numerical model to generate more results than available from the experimental facility. Besides, specifically in more basic research, composite modelling may also be used to improve in-depth understanding of the relative importance of different processes which act simultaneously in the experimental test and may be artificially separated in numerical simulations. All these advantages of composite modelling are illustrated in this paper through the presentation of several application examples resulting from the experience of the Research Group HECE of the University of Liege. [less ▲]

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See detailHydraulics of Piano Key Weirs: A review
Erpicum, Sébastien ULiege; Archambeau, Pierre ULiege; Dewals, Benjamin ULiege et al

in Erpicum, Sébastien; Laugier, Frédéric; Ho Ta Khanh, Michel (Eds.) et al Labyrinth and Piano Key Weirs III - PKW 2017 (2017)

The Piano Key Weir (PKW) is a rectangular-labyrinth-type weir that utilizes cantilevered apexes in order to maximize the allowable weir length that can fit in a given spillway channel width, while ... [more ▼]

The Piano Key Weir (PKW) is a rectangular-labyrinth-type weir that utilizes cantilevered apexes in order to maximize the allowable weir length that can fit in a given spillway channel width, while reducing the required structural footprint. These features make it an interesting and viable solution for increasing discharge capacity at existing dams as well as new projects. Since the early works at the University of Biskra in 2000, numerous re-search and development works have been carried out in several laboratories to understand the PKW hydraulic behavior, optimize its design and prove its advantages and drawbacks. Beside, more than 25 PKWs are now in operation or under construction all over the world. This paper aims at summarizing the information available to date about PKW hydraulics in order to provide a synthetic overview and a reference list to students, researchers and practitioners and thus help them to understand how such a complex structure operates and what could be the possible further steps in research and development. [less ▲]

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See detailA Piano Key Weir to improve the discharge capacity of the Oule Dam spillway (France)
Erpicum, Sébastien ULiege; Archambeau, Pierre ULiege; Dewals, Benjamin ULiege et al

in Erpicum, Sébastien; Laugier, Frédéric; Ho Ta Khanh, Michel (Eds.) et al Labyrinth and Piano key weirs III - PKW 2017 (2017)

The Oule dam spillway (France) is made of a lateral weir on the right bank of the reservoir, a collecting channel, a macro-steps channel and a downstream lateral weir for water release in the natural ... [more ▼]

The Oule dam spillway (France) is made of a lateral weir on the right bank of the reservoir, a collecting channel, a macro-steps channel and a downstream lateral weir for water release in the natural river bed. This spillway presents a deficit in discharge capacity. In order to solve this problem, several rehabilitation solutions have been analyzed. From this process, a piano key weir solution to improve the discharge capacity of the lateral upstream weir has been selected. This piano key weir will replace the existing ogee crest while keeping weir level and thus normal reservoir elevation constant. The piano key weir, 1 m high, has been designed with steel and is made of 22.5 units for a total width of 33 m. Its main advantage is to drastically increase the discharge capacity at low heads, enabling the release of the design flood peak discharge just below the reservoir maximum elevation by optimizing the reservoir temporary storage. [less ▲]

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See detailCould Piano key weirs be subject to nappe oscillations?
Lodomez, Maurine ULiege; Pirotton, Michel ULiege; Dewals, Benjamin ULiege et al

in 3rd International Workshop on Labyrinth and Piano Key Weirs - PKW 2017 (2017)

Nappe oscillation may affect a variety of free overflow hydraulic structures operating at low heads such as crest gates and various types of weirs. This phenomenon produces oscillations in the thin nappe ... [more ▼]

Nappe oscillation may affect a variety of free overflow hydraulic structures operating at low heads such as crest gates and various types of weirs. This phenomenon produces oscillations in the thin nappe cascading downstream of the control structure. These oscillations can result in a high noise levels that may affect people and structures located nearby. With long linear and thin overtopping walls, piano key weirs might be subject to strong nappe oscillation risks, as a few documented cases with labyrinth weirs. However, the specific geometric features of piano key weirs, such as the outlet ramps or the limited width of the inlet apex, could perhaps prevent the development of nappe oscillation. In this paper, a prototype-scale linear weir is operated to assess the risk of nappe oscillations on a piano key weir like configuration (sidewall). In particular, the effect of the weir width and inclined apron is analyzed. The experimental results show that nappe oscillation development should not occur on piano key weir, contrary to what might be observed on a labyrinth weir with the same crest. [less ▲]

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See detailDiscussion of: Laboratory Study on 3D Flow Structures Induced by Zero-Height Side Weir and Implications for 1D Modeling
Rifai, Ismail ULiege; Erpicum, Sébastien ULiege; Archambeau, Pierre ULiege et al

in Journal of Hydraulic Engineering (2017), 143(3), 07016010

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See detailComputing flooding of crossroads with obstacles using a 2D numerical model (Discussion)
Bruwier, Martin ULiege; Erpicum, Sébastien ULiege; Archambeau, Pierre ULiege et al

in Journal of Hydraulic Research (2017), 55(5), 737-741

Based on an operational 2D shallow-water model, the Authors computed subcritical dividing flow at a three-branch crossroad, considering obstacles located at different positions. The numerical predictions ... [more ▼]

Based on an operational 2D shallow-water model, the Authors computed subcritical dividing flow at a three-branch crossroad, considering obstacles located at different positions. The numerical predictions were compared to observations from Mignot et al. (2013). Two issues are addressed here, related respectively to the efficiency and relevance of the turbulence model, and to the representation of the obstacles in operational flood models. [less ▲]

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See detailLanduse change and future flood risk: the influence of micro-scale spatial patterns (FloodLand) - 4th progress report
Dewals, Benjamin ULiege; Bruwier, Martin ULiege; El Saeid Mustafa, Ahmed Mohamed ULiege et al

Report (2016)

The goal of the project FloodLand is to investigate the complex interactions between landuse change and future flood risk. Landuse change is assumed to be mainly driven by population growth and socio ... [more ▼]

The goal of the project FloodLand is to investigate the complex interactions between landuse change and future flood risk. Landuse change is assumed to be mainly driven by population growth and socio-economic factors. It affects future flood risk by altering catchment hydrology as well as vulnerability in the floodplains; but the feedback effect of (the perception of) changes in flood hazard on landuse evolution is also considered. The research is based on a chain of modelling tools, which represent parts of the natural and human systems, including: landuse change modelling, transportation modelling as an onset for the estimation of indirect flood damage, continuous hydrological modelling (forced by precipitation and temperature data disturbed according to climate change scenarios), as well as efficient hydraulic modelling of inundation flow in the floodplains. Besides reproducing a broad spectrum of processes, the modelling approach spans over multiple scales, from the regional or catchment level down to the floodplain and building levels. This distinctive feature is reflected both within the individual models and through their combination involving fine-scale detailed analyses (or data) embedded within coarser models at a broader level. [less ▲]

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See detailA benchmark for urban flood modelling
Arrault, Anaïs; Finaud-Guyot, Pascal; Archambeau, Pierre ULiege et al

Poster (2016, October 25)

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See detail1-D shallow water model for industrial practice: Application to the River Romanche
Goffin, Louis ULiege; Dewals, Benjamin ULiege; Erpicum, Sébastien ULiege et al

Scientific conference (2016, October 25)

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See detailInfluence of groundwater exchanges on the efficiency of Underground Pumped Storage Hydroelectricity plants using open pit mines
Pujades, Estanislao ULiege; Bodeux, Sarah ULiege; Orban, Philippe ULiege et al

Poster (2016, September 27)

Underground Pumped Storage Hydropower (UPSH) plants can be used to manage the production of electrical energy according to the demand. These plants consist in two reservoirs, the upper one is located at ... [more ▼]

Underground Pumped Storage Hydropower (UPSH) plants can be used to manage the production of electrical energy according to the demand. These plants consist in two reservoirs, the upper one is located at the surface while the lower one is underground. The energy is stored by pumping water from the lower to the upper reservoir and produced by releasing water from the upper to the lower one. As a result, the hydraulic head in the lower reservoir varies continuously. UPSH plants interact with the surrounding aquifers exchanging groundwater. These groundwater exchanges, which play an important role in the evolution of the hydraulic head inside the underground reservoir, are a fact of concern in the selection of pumps and turbines because their efficiency varies with respect to the head difference between the two reservoirs. Therefore, the aquifer parameters should be considered in the selection of pumps and turbines. In this context, with an UPSH plant made up by an open pit mine, we study numerically (1) the influence of groundwater exchanges on the efficiency and (2) how the hydraulic head evolution varies depending on the aquifer properties. The relation among the groundwater exchanges, the efficiency of pumps and turbines and the aquifer parameters is considered by comparing the numerical results of several simulations. It is shown that groundwater exchanges are not negligible when optimizing the efficiency of UPSH plants. A priori, low hydraulic conductivity geological media were preferred to decrease interactions with the open-pit or the cavity used as lower reservoir. Taking into account the pump/turbine performance curves, it appears that, on the contrary, the global efficiency would be increased if the surrounding medium facilitates large groundwater exchanges because hydraulic head variations are softened. [less ▲]

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See detailMonitoring topography of laboratory fluvial dike models subjected to breaching based on a laser profilometry technique
Rifai, Ismail ULiege; Erpicum, Sébastien ULiege; Archambeau, Pierre ULiege et al

in International Symposium on River Sedimentation: Stuttgart 19th-22d september 2016 (2016, September)

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See detailFailure of fluvial dikes: how does the flow in the main channel influence the breach development?
Rifai, Ismail ULiege; Erpicum, Sébastien ULiege; Archambeau, Pierre ULiege et al

in Dewals, Benjamin; Archambeau, Pierre; Pirotton, Michel (Eds.) et al Sustainable Hydraulics in the Era of Global Change (2016, July)

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See detailInfluence of non-uniform flow conditions on riverbed stability: the case of smooth-to-rough transitions
Duma, Diana ULiege; Erpicum, Sébastien ULiege; Archambeau, Pierre ULiege et al

in Dewals, Benjamin; Archambeau, Pierre; Pirotton, Michel (Eds.) et al Sustainable Hydraulics in the Era of Global Change (2016, July)

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See detailSensitivity of the breaching process in the case of overtopping induced fluvial dike failure
Rifai, Ismail ULiege; Erpicum, Sébastien ULiege; Archambeau, Pierre ULiege et al

in River Flow 2016 Proceedings (2016, July)

Fluvial dikes are common structures constructed for flow channelization, prevention of river bed lateral migration and for flood protection purposes. Their aging increases their vulnerability to extreme ... [more ▼]

Fluvial dikes are common structures constructed for flow channelization, prevention of river bed lateral migration and for flood protection purposes. Their aging increases their vulnerability to extreme hydro-logical events, and subsequently may cause their failure. Many laboratory studies of overtopping induced dike failure were conducted, dealing mainly on normal configurations (i.e. dam break configuration) without ac-counting for the influence of a parallel flow. The fluvial dike breaching process remains, therefore, insuffi-ciently studied. A simplified model assuming a parameterized evolution of the breach geometry has been de-veloped to evaluate the fluvial breaching process. Results showed a sensitivity of the breaching process to the main channel configuration and to the flow conditions. Also, the evolution mode that was prescribed for the breach cross-section strongly influences the breaching duration and the sediment discharge [less ▲]

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See detailContribution of future urbanisation expansion to flood risk changes
Bruwier, Martin ULiege; Mustafa, Ahmed; Archambeau, Pierre ULiege et al

Conference (2016, April)

The flood risk is expected to increase in the future due to climate change and urban development. Climate change modifies flood hazard and urban development influences exposure and vulnerability to floods ... [more ▼]

The flood risk is expected to increase in the future due to climate change and urban development. Climate change modifies flood hazard and urban development influences exposure and vulnerability to floods. While the influence of climate change on flood risk has been studied widely, the impact of urban development also needs to be considered in a sustainable flood risk management approach. The main goal of this study is the determination of the sensitivity of future flood risk to different urban devel~ opment scenarios at a relatively short-time horizon in the River Meuse basin in Wallonia (Belgium). From the different scenarios, the expected impact of urban development on flood risk is assessed. Three urban expansion scenarios are developed up to 2030 based on a coupled cellular automata (CA) and agent-based (AB) urban expansion model: (i) business-as-usual, (ii) restrictive and (m) extreme expansion scenarios. The main factor controlling these scenarios is the future urban land demand. Each urban expansion scenario is developed by considering or not high and/or medium flood hazard zones as a constraint for urban development. To assess the model's performance, it is calibrated for the Meuse River valley (Belgium) to simulate urban expansion between i990 and 2000. Calibration results are then assessed by comparing the 2000 simulated land-use map and the actual 2000 land-use map. The flood damage estimation for each urban expansion scenario is determined for five flood discharges by overlaying the inundation map resulting from a hydraulic computation and tlte urban expansion map and by using damage curves and specific prices. The hydraulic model Wolt‘2D has been extensively validated by comparisons between observations and computational results during flood event .This study focuses only on mobile and immobile prices for urban lands, which are associated to the most severe damages caused by floods along the River Meuse. These findings of this study offers tools to drive urban expansion based on numerous policies visions to mitigate future flood risk along the Meuse River. In particular, we assess the impacts on future flood risk of the prohibition of urban development in high and/or medium flood hazard zones. [less ▲]

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See detailUnderground Pumped Storage Hydropower using abandoned open pit mines: influence of groundwater seepage on the system efficiency
Pujades, Estanislao ULiege; Bodeux, Sarah ULiege; Orban, Philippe ULiege et al

Poster (2016, April)

Pumped Storage Hydropower (PSH) plants can be used to manage the production of electrical energy according to the demand. These plants allow storing and generating electricity during low and high demand ... [more ▼]

Pumped Storage Hydropower (PSH) plants can be used to manage the production of electrical energy according to the demand. These plants allow storing and generating electricity during low and high demand energy periods, respectively. Nevertheless, PSH plants require a determined topography because two reservoirs located at different heights are needed. At sites where PSH plants cannot be constructed due to topography requirements (flat regions), Underground Pumped Storage Hydropower (UPSH) plants can be used to adjust the electricity production. These plants consist in two reservoirs, the upper one is located at the surface (or at shallow depth) while the lower one is underground (or deeper). Abandoned open pit mines can be used as lower reservoirs but these are rarely isolated. As a consequence, UPSH plants will interact with surrounding aquifers exchanging groundwater. Groundwater seepage will modify hydraulic head inside the underground reservoir affecting global efficiency of the UPSH plant. The influence on the plant efficiency caused by the interaction between UPSH plants and aquifers will depend on the aquifer parameters, underground reservoir properties and pumping and injection characteristics. The alteration of the efficiency produced by the groundwater exchanges, which has not been previously considered, is now studied numerically. A set of numerical simulations are performed to establish in terms of efficiency the effects of groundwater exchanges and the optimum conditions to locate an UPSH plant. [less ▲]

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