Anton J. Schleiss

Anton J. Schleiss
École Polytechnique Fédérale de Lausanne | EPFL · Civil Engineering Institute

Prof. Dr. Civ. Eng. ETHZ
Professor emeritus of Ecole polytechnique fédérale de Lausanne (EPFL), Switzerland ; international expert and consultant

About

837
Publications
188,701
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
7,141
Citations
Additional affiliations
August 2006 - August 2012
École Polytechnique Fédérale de Lausanne
Position
  • Managing Director
October 1997 - March 2018
École Polytechnique Fédérale de Lausanne
Position
  • Managing Director

Publications

Publications (837)
Article
Within the framework of the EU Horizon 2020 project, the Hydropower Europe Forum has prepared a Research and Innovation Agenda and a Strategic Industry Roadmap for the hydropower sector. These two outcomes are presented in this paper, including the main results of the prioritization assessment process. The paper also shows which research themes, to...
Article
Full-text available
Stepped spillways are frequently limited to specific discharges under around 30 m2/s due to concerns about potential cavitation damages. A small air concentration can prevent such damages and the design of bottom aerators is well established for smooth chutes. The purpose of this study is to systematically investigate the performance of a deflector...
Article
Full-text available
The European Union has the ambition to be the first carbonneutral continent by 2050. To fulfil this objective and integrate into the grid the large amount of power from solar and wind, Europe can rely upon the high storage and flexible capacity of hydropower. Thus, new reservoirs and innovative use of current reservoirs will be needed to provide an...
Article
Full-text available
The European Union has the ambition to be the first carbonneutral continent by 2050. To fulfil this objective and integrate into the grid the large amount of power from solar and wind, Europe can rely upon the high storage and flexible capacity of hydropower. Thus, new reservoirs and innovative use of current reservoirs will be needed to provide an...
Article
Full-text available
Fluctuating bottom‐pressures on stepped chutes are relevant for the spillway design. An abrupt slope reduction causes a local alteration of the bottom‐pressure development. Little information is available regarding the air–water flow properties near an abrupt slope reduction on stepped chutes, particularly on the local pressure evolution. Neverthel...
Article
Full-text available
About 50% of all hydropower plants (HPPs) worldwide were originally commissioned more than 40 years ago, so that the advanced age of the fleet is a major concern across all continents, and especially in Europe. The modernization of HPPs can generate several benefits in terms of generation, flexibility, safety, operation, and may have neutral or eve...
Article
Full-text available
Large wood increases the morphological and hydraulic complexity of rivers, yet it may block and modify the flood discharge capacity of hydraulic structures. To assess the related risk, blockage probability estimation for hydraulic structures such as reservoir spillways is needed. This work presents unstudied parameters for blockage of large wood wi...
Article
Chancy-Pougny is a run-of-river dam on the Swiss–French border constructed in the early 1920s. Since its commissioning, the operation of the four spillway gates has been responsible for a progressive erosion of the stilling basin. The future scour potential of the unlined stilling basin of the Chancy-Pougny dam was assessed by hybrid modeling, comb...
Article
Advances of roller compacted concrete (RCC) in the construction of concrete dams has significantly influenced the development of stepped spillways. The latter are now more frequently implemented in the rocky abutments of embankment dams. The energy dissipation downstream of stepped chutes is mostly ensured by stilling basins. Such stilling basins a...
Conference Paper
River Flow 2020: Proceedings of the 10th Conference on Fluvial Hydraulics (Delft, Netherlands, 7-10 July 2020)
Article
River reaches downstream of dams with constant residual discharge often lack sediment supply and periodic high flows due to dam sediment retention and flow regulation, respectively. To test a novel multi‐deposit methodology for defining environmental flows, activating dynamics of river morphology downstream of dams, a flood was released from Rossen...
Article
Sediment detention basins are implemented on mountain rivers to trap solid material that may aggravate the flooding of downstream settlements. However, retention structures built in the past may unnecessarily retain sediment during non-hazardous flood events, resulting in high maintenance costs and sediment deficit downstream. In addition, the so-c...
Article
Steady free-surface flows around buildings occurring during flood or tsunami events can produce major damages and a quantification of the post-peak forces is essential for safety and resilience of coastal structures. The loading process is highly affected by the flow Froude number and the drag coefficient, commonly defined for highly subcritical fl...
Article
A new EU initiative, Hydropower-Europe, is reported here. This work, soon to be launched, will provide a framework for the hydropower sector in Europe to define a research and innovation agenda, and technology roadmap. The initiative is expected to help position European hydropower within the international market, and support development of the sec...
Conference Paper
HYDROPOWER-EUROPE is a project selected by European Commission after the call H2020 LC-SC3-CC-4-2018, whose the scope is "bringing together stakeholders of the hydropower sector in a forum" to develop a roadmap of research and innovation for new hydropower technologies and innovative mitigation measures. The International Commission on Large Dams (...
Article
Full-text available
The blockage of weirs or bridges by in-stream wood can reduce the flood discharge capacity, leading to hazardous situations. To assess the related risk, blocking probabilities quantifications are needed. However, large wood has a random behaviour and it is challenging to accurately evaluate the blockage process and the influence of different large...
Conference Paper
Full-text available
Hydropower has a long tradition in Europe and contributed in the first half of the last century significantly to the industrial development and welfare in most of the countries in Europe. The ambitious plan for energy transition in Europe seeks to achieve a low-carbon climate-resilient future in a safe and cost-effective way serving as a worldwide...
Article
Tsunamis, impulse-waves and dam-break waves have affected humanity in recent decades and the construction of vertical shelters can provide safety to people. However, for non-critical infrastructures, typically residential houses of lower height, overtopping is accepted during such events. This study experimentally quantifies the effect of building...
Chapter
Full-text available
The Saddle Dam D at the Hydroelectric Power project Xe-Pian Xe-Namnoy in the Lao People’s Democratic Republic failed on July 23, 2018. An Independent Expert Panel (IEP) was established to investigate into and report on the failure of the embankment dam. The Executive Summary of the IEP final report (Anton J. Schleiss, Jean-Pierre Tournier, and Ahme...
Conference Paper
A two mode four-equation model is implemented incorporating the main interacting mechanisms. The resistance to movement due to inertia and dry friction of the anchor blocks is treated as junction coupling, while unsteady skin friction is taken into account in friction coupling. Experimental water-hammer tests collected from a straight copper pipe-r...
Article
Les tsunamis, les vagues d'impulsion et les ruptures de barrages représentent des phénomènes extrêmes qui mettent en danger la vie des personnes et la fonctionnalité des infrastructures. Des événements récents dans l'Océan Indien (2004), au Japon (2011) et en Indonésie (2018) ont montré que des mesures constructives peuvent réduire les charges indu...
Article
Tsunamis, impulse waves, and dam-break waves are rare but catastrophic events, associated with casualties and damage to infrastructures. An adequate description of these waves is vital to assure human safety and to generate resilient structures. Furthermore, a specific building geometry with openings, such as windows and doors, reduces wave-induced...
Article
Full-text available
Recent natural disasters that seriously affected critical infrastructure (CI) with significant socio-economic losses and impact revealed the need for the development of reliable methodologies for vulnerability and risk assessment. In this paper, a risk-based multi-level stress test method that has been recently proposed, aimed at enhancing procedur...
Article
Tagungsbericht Am 11. und 12. September 2019 hat der Hydropower Europe Workshop stattgefunden. Veranstaltungsort war die EPFL (Ecole polytechnique f6d6rale de Lausanne) in Lausanne, Schweiz.
Conference Paper
In the last decades numerous stepped spillways were built, mostly on the downstream face of roller compacted concrete (RCC) dams. Stilling basins are often used as an energy dissipater. Although the hydraulics of stepped chutes was extensively investigated in the last decades, only fragmentary information is available on the hydraulic characteristi...
Article
Concurrent rehabilitation alternatives were evaluated for a 1900 m reach of the River Etsch in northern Italy using a recently developed Hydro Morphological Index of Diversity (HMID) model. HMID is a new tool enabling quantitative assessments of river restoration alternatives on ecologically relevant scales. The model is able to characterize both t...
Article
The protection of river banks in mountain rivers by riprap requires large blocks with weights typically exceeding 1 t. Thus, the blocks have to be placed individually. Such packed riprap has a relatively small spacing between the blocks. Consequently, the interlocking forces between the blocks are high, and the resistance of this protection to eros...
Article
Bridge failure, due to local scour at bridge pier foundations, has become a critical issue in river and bridge engineering, which might lead to transportation disruption, loss of lives and economic problems. A practical solution to prevent bridge collapses is the implementation of scour mitigation methods around bridge foundations. Based on an expe...
Article
Full-text available
Overbank sedimentation is predominantly due to fine sediments transported under suspension that become trapped and settle in floodplains when high-flow conditions occur in rivers. In a compound channel, the processes of exchanging water and fine sediments between the main channel and floodplains regulate the geomorphological evolution and are cruci...
Article
Située à la confluence de deux cours d'eau – la Limmat et la Sihl – la ville de Zurich a toujours dû faire face aux crues. Suite aux crues de 2005, un projet de dérivation de la Sihl vers le lac de Zurich en amont de la ville a été lancé. En alternative à un premier projet de galerie de décharge de la Sihl, qui ne contribue qu'à la protection contr...
Article
Piano key weirs (PKWs) are a weir type characterized by an effective rating curve. Accordingly, this control structure is primarily applied at dams to increase the spillway capacity. In recent years, PKWs also have been implemented in rivers combined with low-head hydropower or to regulate waterways. For the latter application, a weir type without...
Article
Local scouring is a leading cause of bridge collapses. To protect bridges against local scouring, different countermeasures have been proposed and tested in the literature. In this study, the performance of collars was evaluated for scour reduction at two tandem piers aligned with four skew angles ( θ) of 0°,30°,60°,90° with respect to flow directi...
Article
Tsunami, impulse-waves and dam-break waves afflict humanity with casualties and damages. Insight into the flow mechanisms of these waves, is important to provide safety and reduce reconstruction costs. This experimental study focuses on the effect of bed roughness on the main hydrodynamic properties of surges propagating on dry bed. Further, the re...
Article
Full-text available
We investigate to what extent the initial conditions (in terms of buoyancy and geometry) of saline gravity currents flowing over a horizontal bottom influence their runout and entrainment capacity. In particular, to what extent the effect of the introduction of an inclined channel reach, just upstream from the lock gate, influences the hydrodynamic...
Article
The geometry and hydrodynamics of river reaches are key ecohydraulic descriptors. Statistics of water depth and velocity measurements are usually taken as proxies for habitat suitability in rivers. However, little is known about the sufficiency of data to produce effective and representative results. In this research, 19 reaches with differences in...
Article
Full-text available
River reaches downstream dams where a constant residual flow discharge is imposed, often lack sediment supply and periodic inundation due to the absence of natural flood events. In this study, a two-year return flood was released from an upstream reservoir and combined with sediment replenishment to enhance instream habitat conditions downstream of...
Article
Full-text available
This paper presents a comprehensive methodology to model and determine the annual sediment balance of a complex system of interconnected reservoirs, based on the detailed interpretation of a multi-decadal data series of reservoir management and modelling of sediment fluxes. This methodology is applied to the reservoirs of Oberaar, Grimsel, Räterich...
Presentation
Full-text available
A two mode four-equation model is implemented incorporating the main interacting mechanisms. The resistance to movement due to inertia and dry friction of the anchor blocks is treated as junction coupling, while unsteady skin friction is taken into account in friction coupling. Experimental water-hammer tests collected from a straight copper pipe-r...
Conference Paper
The appropriate design of a river diversion system during construction of dam is an essential task since dramatic consequences in view of cost and time overrun may be involved. After a short outline of the different methods of river diversion and its main structural elements, the paper focuses on critical issues in relation with the design of diver...
Article
Full-text available
The present review paper aims at collecting and discussing the research work, numerical and experimental, carried out in the field of Fluid–Structure Interaction (FSI) in one-dimensional (1D) pressurized transient flow in the time-domain approach. Background theory and basic definitions are provided for the proper understanding of the assessed lite...
Article
Full-text available
Buoyancy driven flows such as gravity currents, present in nature and human made applications, are conveyors of particles or dissolved substances for long distances with clear implications for the environment. This transport depends on the triggering conditions of the current. Gravity currents are experimentally simulated under varying initial cond...
Poster
Full-text available
Dams and their reservoirs are undoubtedly valuable to society because they are essential for hydropower production, they provide flood protection, supply water for consumption and irrigation, and are used as tourist attractions. On the other hand, by impounding upriver valleys, dams often have a negative impact on fluvial ecosystems. In Switzerland...
Conference Paper
Die Wasserkraft ist die wichtigste Säule der heutigen Schweizer Stromproduktion und deren Ausbau ist in den nächsten Jahrzehnten im Rahmen der Energiestrategie 2050 geplant. Deshalb ist ein auch nachhaltiger Betrieb der Wasserkraftwerke erforderlich. Geschiebebeigaben kombiniert mit künstlich ausgelösten Hochwasser gewinnen zunehmend an Interesse u...
Article
Recently, Jafarnejad, Franca, Pfister, and Schleiss [2017. Time-based failure analysis of compressed riverbank riprap. Journal of Hydraulic Research, 55(2), 224–235. doi: 10.1080/00221686.2016.1212940] presented an experimental study on the stability of compressed riprap, which means that it is composed of individually placed blocks with a single l...
Poster
Full-text available
[GERMAN] In Zusammenarbeit mit dem Energieversorger Groupe e und des Kanton Fribourgs, wurde im September 2016 eine Reaktivierung der Auen mittels eines künstlichen Hochwassers und Geschiebeschüttungen in der Saane unterhalb der Staumauer Rossens getestet.
Conference Paper
Full-text available
Reservoir sedimentation is a major concern in the operational management of dams and appurtenant structures. The increasing volume of sediments deposited in reservoirs leads to a loss of water storage, undermining the purpose itself of the dam for human use or protection. The deposition of sediments (mostly fine) in the vicinity of the dam’s operat...
Conference Paper
Full-text available
Hydropower is an important pillar of the electricity production in Switzerland and its extension is planned in the next decades. Therefore, a more sustainable management of hydropower plants is needed. Sediment replenishment combined with artificially-triggered flood pulses are gaining increasing interest to restore residual flow reaches. In the Sa...