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Giovanni De Cesare

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Publications associées (219)

Vortex siphon - from 1:1 scale physical model to SPH simulation and prototype

Giovanni De Cesare

The rail link between Geneva Cornavin Station, Eaux-Vives Station and Annemasse (CEVA) is currently under construction including a cut-and-cover tunnel built by slurry walls located in the alluvium of the Foron River. The covered trench cuts the groundwate ...

2019

Numerical approach in the study of tsunami-like waves and comparison with experimental data

Giovanni De Cesare, Michael Pfister, Davide Wüthrich, Shun Nomura

A comprehensive understanding of physical phenomena based on a hybrid experimental-numerical approach supports a safer design of critical infrastructures. However, for large-scale tsunami-like waves, the reliability of numerical models was insufficiently v ...

2019

Anatomie d’un coude

Giovanni De Cesare, Azin Amini, Raphaël Sprenger, Jean-Noël Saugy

À Martigny, le Rhône prend un virage à 90 degrés vers le nord-ouest. Un changement de cap qui influence fortement la dynamique du fleuve, surtout en période de crue. Afin de mieux en connaître les effets, la Plateforme de constructions hydrauliques de l’EP ...

espazium2019

Innovative methods to release fine sediments from reservoirs developed at EPFL, Switzerland

Giovanni De Cesare, Anton Schleiss, Pedro Filipe De Almeida Manso, Azin Amini, Sabine Chamoun

Electricity generation, water supply, flood protection, flow regulation and navigation are amongst the main services provided by reservoirs. Sedimentation affects the sustainability of reservoirs, by reducing their storage capacity, and increases the negat ...

2019

Influence of Operational Timing on the Efficiency of Venting Turbidity Currents

Giovanni De Cesare, Anton Schleiss, Sabine Chamoun

Reservoir sedimentation is gaining growing attention as dams are aging, due to economic and environmental consequences. Venting of turbidity currents is one of many sediment management techniques, highly recommended when water is in shortage. The venting o ...

2018

Flow measurement for the design optimization of fish pass entries in a run of river hydropower plant

Giovanni De Cesare, Cédric Bron, Pierre Bourqui

The International Commission for the Protection of the Rhine (ICPR) has set the objective of guarantying the upstream migration of the salmons up to Basel, Switzerland, at horizon 2020. One of the last dams to be equipped is the one of Rhinau, in France. T ...

2018

Floating modular unit for controlled sediment flushing regarding sediment size and concentration

Giovanni De Cesare

Sediment management is a challenging discipline, especially in regions where the storage capacity of reservoirs decreases due to sediment accumulation. This paper shows an innovative and holistic modular technical approach to the problem, considering a gre ...

ed. Hydropower&Dams, Aqua Media International2018

Hybrid Modelling Approach to Study Scour Potential at Chancy-Pougny Dam Stilling Basin

Giovanni De Cesare, Erik Bollaert, Anton Schleiss, Sabine Chamoun, Davide Wüthrich

Chancy-Pougny is a run-of-river dam on the Swiss-French border constructed in the early 1920s. Since its inauguration, the operation of the four spillway gates was responsible for a progressive erosion of the stilling basin. Thus, a hybrid modelling was pe ...

Springer2018

Venting of turbidity currents approaching a rectangular opening on a horizontal bed

Giovanni De Cesare, Anton Schleiss, Sabine Chamoun

Taylor & Francis Ltd2018

Le transit des courants de turbidité, une technique pour réduire l’alluvionnement des réservoirs de barrages

Giovanni De Cesare, Anton Schleiss, Sabine Chamoun

La sédimentation des réservoirs est une problématique globale réduisant le volume d’eau disponible dans les réservoirs de barrages et induisant des pertes aux niveaux énergétique, économique et environnemental. Le transport de sédiments du bassin versant p ...

2018

Evolution of reservoir flushing and emptying practices in a cascade of large reservoirs across several decades

Giovanni De Cesare, Pedro Filipe De Almeida Manso, Sebastián Guillén Ludeña, Samuel Luke Vorlet

Reservoir sedimentation is, at present, one of the main concerns in the operational management of dams in the Alps. For larger seasonal storage reservoirs, the main operational concern is the blockage of bottom outlets and turbine abrasion. In case of infr ...

2018

Distinctive features of horizontal and vertical velocity profiles in turbidity and saline density currents

Giovanni De Cesare, Sara Venuleo, Shun Nomura, Jumpei Hitomi

The flow field of turbidity current and saline density current in lock-gate flume is measured by the ultra-sound Doppler velocity profiler. The horizontal and vertical velocity and their fluctuations are discussed. ...

2018

Spatial interpolation of precipitation from multiple rain gauge networks and weather radar data for operational applications in Alpine catchments

Giovanni De Cesare, Bettina Schaefli, Javier García Hernández, Alain Tommy Foehn

Increasing meteorological data availability and quality implies an adaptation of the interpolation methods for data combination. In this paper, we propose a new method to efficiently combine weather radar data with data from two heated rain gauge networks ...

2018

Physical and 3D Numerical Simulations of the Flow in the Tailrace of a Hydroelectric Power Plant to Design Fishway Entries

Giovanni De Cesare, Pierre Bourqui

This work is part of a project aiming at dimensioning a fishway for a hydroelectric power plant on the Rhine River. Here we only focus on the design of the fishway entrances, for which a physical model of the draft tubes and tailrace of the powerplant was ...

Springer2018

Sediment mass movement of a particle-laden turbidity current based on ultrasound velocity profiling and the distribution of sediment concentration

Giovanni De Cesare, Shun Nomura, Jumpei Hitomi

Particle-laden flows or turbidity currents along the seafloor are important to the formation and erosion of submarine topography. To understand the mass-transport process, flume tests were carried out with a continuous supply of quartz-laden suspension. Th ...

2018

Design of a Throttled Surge Tank for Refurbishment by Increase of Installed Capacity at a High-Head Power Plant

Giovanni De Cesare, Bernard Valluy, Anton Schleiss, Nicolas Jean François Pascal Ghislain Adam

The Swiss confederation aims to phase out nuclear power production with its Energy Strategy 2050 program by increasing the renewable energy contribution to its overall energy generation. Hydroelectricity, which is the most important form of renewable energ ...

American Society of Civil Engineers2018

Understanding turbulent free-surface vortex flows using a Taylor-Couette flow analogy

Giovanni De Cesare

Free-surface vortices have long been studied to develop an understanding of similar rotating flow phenomena observed in nature and technology. However, a complete description of its turbulent three-dimensional flow field still remains elusive. In contrast, ...

Nature Publishing Group2018

Investigation of local scour around tandem piers for different skew-angles

Giovanni De Cesare, Anton Schleiss, Sargol Memar

In the present study the effect of the skew-angle of the alignment of tandem piers on local scour depth around them is investigated. The tandem piers were aligned with different skew-angles of 𝜃𝜃 = 0°, 30°, 45°, 60°, 90° with respect to the flow direction. ...

2018

Innovative methods to release fine sediments from seasonal reservoirs

Giovanni De Cesare, Anton Schleiss, Pedro Filipe De Almeida Manso, Azin Amini, Sabine Chamoun, Sebastián Guillén Ludeña

The papers present three innovative solutions for fine sediment manage- ments in seasonal reservoirs, which are at different stages of maturity. Operational reservoir stirring using jet-like inflows may facilitate sediment routing, at no addi- tional cost ...

CRC Press/Balkema2018

Numerical Modeling of turbidity currents with Ansys CFX and Telemac 3D

Giovanni De Cesare, Anton Schleiss, Sabine Chamoun

Turbidity currents may be a relevant lever to manage the accumu-lation of fine sediments in reservoirs. In this paper, we propose to show how two different numerical codes simulate the propagation of turbidity currents. Telemac 3D and Ansys CFX 17.1 solver ...

2018

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