Publications by Jean-Louis Boillat

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In open channels, a sudden rise in water elevation generates a positive surge. Positive surges are commonly observed in man-made channels (Bazin 1865, Treske 1994) and a natural occurrence is the tidal bore in macro-tidal estuaries (Tricker 1965, Chanson 2 ...

Flood management is more than ever an issue for dam designers and engineering consulting firms in charge of rehabilitation works. Piano Key Weirs are a new cost-effective type of spillway designed to improve dams discharge capacity. These structures are particularly attractive: they can easily be built on existing structures and enable very high discharge capacities. Therefore, Piano Key Weirs are nowadays studied worldwide. Piano Key Weir description involves a lot of geometrical parameters (more than 30),

La réhabilitation des barrages existants impose généralement une augmentation de leur capacité d’évacuation en crue. Dans de nombreuses situations, le PK-Weir (Piano Key Weir) offre à cet égard une solution compacte et efficace. La conception et la réalisa ...

As the need for energy is increasing, the challenges in the future are to operate existing large hydraulic schemes in more sustainable ways and to develop future water resources projects that are able to achieve a better balance between environmental and s ...

Low velocity and shallow-depth flow fields often are a challenge to most velocity measuring instruments. In the framework of a research project on reservoir sedimentation, the influence of the reservoir geometry on sediment transport and deposition was stu ...

The main goal of the 3(rd) Rhone Correction project is to improve the flood protection in the Upper Rhone River basin. In this context, the MINERVE project aims contributing to a better flow control during flood events, taking advantage from the multireser ...

Lorsque les zones de confluence de deux cours d’eau ont une morphologie proche de l’état naturel, la connectivité des cours d’eau est maximale. La présente "che explique comment l’élargissement local des embouchures accroît la diversité des habitats et la connectivité longitudinale des cours d’eau. Ces mesures sont souvent peu onéreuses car elles ne sont mises en oeuvre que localement.

The Gage II concrete arch dam shows some limiting constraints in its structural behavior when submitted to particular hydrostatic and thermal load conditions. Its sensitivity to low temperature has led to determine two different maximum water levels during winter and summer, respectively. Therefore, a new complementary spillway, composed by a PKWeir and a flap gate weir has been designed by EDF and optimized using a physical scaled model at LCH. The experimental tests have been carried out for different con

The Gloriettes concrete arch dam in the French Pyrenees showed a deficit of 80 m3/s for the new design flood of 150 m3/s. To address the problem, a Piano Key Weir (PKW) as an additional spillway was designed. The existence of a geotechnically unstable zone downstream of the PKW site, as well as requirements for environmental integration, did not allow a direct trajectory of the tailrace channel, but imposed an abrupt change in direction halfway. A stepped channel including an intermediate stilling basin was

After a major flood with a peak discharge of 177 m³/s in the city of Martigny (Valais, Switzerland) by the alpine river Drance in October 2000, the local authorities are strengthening efforts for the protection of the urban area. The Drance has an annual a ...

The Milibach River between Hasliberg-Reuti and Meiringen agglomerations in Switzerland has a limited hydraulic capacity leading to frequent flooding. During the 2005 flood event, large populated areas were inundated and damages exceeding many millions of Swiss francs occurred (Fig. 1). The deficit of the river flow capacity is essentially caused by a reduction of river cross sections due to local sediment deposits which lead to the overtopping of the lateral embankments

The paper focuses on the development of the hydraulic–hydrological model used to simulate water resources management scenarios in the Zambezi River basin. The main challenges of the implementation of the model are the scarcity of continuous reliable discha ...

River channelization and the construction of high-head storage schemes have been the basis of agricultural and socio-economic development in many alpine regions. One example is the Upper-Rhone River in Switzerland. The Upper-Rhone's morphology changed cons ...

Aspects of the MINERVE project are detailed including work on incorporating LAM forecasts into a hydro-meteorologicalical model used operationally in Switzerland. ...

Dans la phase d'étude de la création de plages et de l'agrandissement de l'adjacent Port de la Nautique sur le Léman à Genève, la complémentarité des modèles numérique et physique a permis de converger vers une solution optimale pour cet aménagement complexe.

Jean-Louis Boillat

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Discussion “Propagation of surge waves in channels with large-scale bank roughness"

A naming convention for the Piano Key Weirs geometrical parameters

Réhabilitation de la capacité d’évacuation des crues – intégration de "PK-Weirs" sur des barrages existants

Influence of Hydropower Development on Flow Regime in the Zambezi River Basin for Different Scenarios of Environmental Flows

Flow field investigation in a rectangular shallow reservoir using UVP, LSPIV and numerical modelling

La prévision hydrométéorologique sur le bassin versant du Rhône en amont du Léman

Elargissement local des embouchures

PKWeir and flap gate spillway for the Gage II Dam

Discussion of Design optimization of floating breakwaters with an interdisciplinary fluid-solid structural problem

Deflectors as riverbanks protection measures

Energy dissipation downstream of Piano Key Weirs – Case of study of Gloriettes Dam (France)

Physical modelling optimization of a filter check dam in Switzerland

Management of the bedload transport of the Milibach torrent for flood protection purpose – physical model based study

Hydraulic–hydrologic model for water resources management of the Zambezi basin

Effect of climate change on hydrological cycle and evolution of the Rhone glacier

Approche méthodologique pour l’établissement d’un projet de protection de rives lacustres

Hydropeaking indicators for characterization of the Upper-Rhone River in Switzerland

MINERVE 2010 : Prévision hydrométéorologique et gestion des crues sur le Rhône alpin

Expertise hydraulique d’un projet lacustre

Physical Processes of Suspended Sediment Deposition and Transport in Shallow Reservoirs