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Michael Pfister

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Related publications (79)

Two-phase air-water flows: Scale effects in physical modelling

Physical modeling represents probably the oldest design tool in hydraulic engineering together with analytical approaches. In free surface flows, the similitude based upon a Froude similarity allows for a correct representation of the dominant forces, name ...

Elsevier Science Inc2014

Effect of compressed riprap thickness on the stability of river banks

Anton Schleiss, Mário Jorge Rodrigues Pereira Da Franca, Mona Jafarnejad Chaghooshi, Michael Pfister

One of the common measures for river bank protection is the installation of riprap. There are several methods to design riprap appropriately, which are however generally limited to dumped medium size blocks. Nevertheless, an additional resistance against e ...

CRC Press/Balkema2014

Discussion of "Skimming, Nonaerated Flow on Stepped Spillways over Roller Compacted Concrete Dams" by Ines Meireles, Floriana Renna, Jorge Matos, and Fabian Bombardelli

Michael Pfister

The nonaerated region may occupy a large portion of the skimming flow in steep, stepped spillways, particularly for relatively high unit flow rates. In spite of the numerous contributions on the hydraulic properties at both the inception point of air entra ...

American Society of Civil Engineers2014

History and significance of the Morton number in hydraulic engineering

Michael Pfister

Two-phase air-water flows occur frequently in hydraulic engineering. Their characteristics, particularly the depth-averaged air concentrations, are of relevance for design. These must be known, for instance, to provide an adequate chute freeboard, or to av ...

Asce-Amer Soc Civil Engineers2014

Air concentration distribution in deflector-jets

Michael Pfister, Sebastian Schwindt

As an alternative to ski jumps, deflectors can be implemented on spillways to generate free jets. They guide, up to a certain limit, the jet to an achieved location onto the plunge pool surface, and furthermore enhance the process of jet disintegration. Th ...

The University of Queensland2014

Head losses in junction manholes for free surface flows in circular conduits

Michael Pfister, Corrado Gisonni

Former studies on combining flows resulted in an efficient layout of sewer junctions operated under supercritical approach flow conditions. Straight extensions allowed a reduction in the shock wave heights generated by the merging flows, so that the global ...

Asce-Amer Soc Civil Engineers2014

Trajectories and air flow features of ski jump-generated jets

Michael Pfister

Ski jumps are frequently applied as spillways of high dams. The resulting jet impact location on the plunge pool surface is often distant from the dam toe so that the latter is protected from scouring. Furthermore, the jet disintegrates and disperses prior ...

Taylor & Francis Ltd2014

Review on pressure distribution on stepped spillways

Anton Schleiss, José Pedro Gamito de Saldanha Calado Matos, Michael Pfister, Mohammad Javad Ostad Mirza

Faculty of Engineering of University of Porto2014

Estimation of A-type Piano Key weir rating curve

Anton Schleiss, Michael Pfister

The Piano Key weir (PKW) is a hydraulically attractive alternative to linear overflow weirs, increasing the unit discharge for similar heads and spillway widths. This advantage allows operating dam reservoirs on an increased level and provides thereby an e ...

Eds Erpicum et al., CRC Press, Boca Raton2013

Overview of Piano Key weir prototypes and scientific model investigations

Anton Schleiss, Marcelo Leite Ribeiro, Michael Pfister

The interest in Piano Key weirs (PKW) was increasing over the past years, both in terms of application and hydraulic research. Several systematic model test series were per-formed and published so far, originating from different hydraulic laboratories arou ...

Erpicum et al., CRC Press, Boca Raton2013

Scale Effects in Modelling Two-phase Air-water Flows

Michael Pfister

Beside analytical approaches, physical modelling represents probably the oldest design tool in hydraulic engineering. For free surface flows, the similitude according to a Froude similarity allows for a correct representation of the dominant forces, namely ...

TPU2013

Effect of driftwood on hydraulic head of Piano Key weirs

Anton Schleiss, Michael Pfister, Blake Tullis

Driftwood is often transported by a river course during flood events and can be problematic where it accumulates at hydraulic structures. Near obstacles, driftwood can block and thus reduces the open flow area for water passage, resulting in a lowered disc ...

Erpicum et al., CRC Press, Boca Raton2013

Debris-Blocking Sensitivity of Piano Key Weirs under Reservoir-Type Approach Flow

Anton Schleiss, Michael Pfister, Blake Tullis

The collection of floating woody debris at flow control structures, such as spillways and weirs, can potentially result in reduced discharge efficiency (higher upstream head for a given weir discharge). Compared to less hydraulically-efficient control stru ...

Asce-Amer Soc Civil Engineers2013

Stepped Spillways: Technical Advance from 1900

Michael Pfister

Stepped spillways are currently a standard design in hydraulic engineering. Whereas these spillways were hardly employed until the advent to the Roller-Compacted Concrete (RCC) Technology in the 1980s, they were of particular interest from the 1990s for sp ...

Tsinghua University Press (wqbook)2013

Time Dependent Failure Analysis of Compressed Riprap as Riverbank Protection

Anton Schleiss, Mário Jorge Rodrigues Pereira Da Franca, Mona Jafarnejad Chaghooshi, Michael Pfister

Riprap is a common measure for protecting river banks against lateral erosion and several methods exist to design them. However, they are generally limited to dumped medium size rocks. If large rock blocks are required for stability reasons, they cannot be ...

TUP2013

Scale effects related to the rating curve of cylindrically crested Piano Key weirs

Giovanni De Cesare, Anton Schleiss, Michael Pfister, Elena Battisacco

Hydraulic scale effects on physical Piano Key weir (PKW) models were so far rarely discussed in literature, even though almost all prototypes are model-tested before construction. In parallel, physical weir models are generally known to include significant ...

Erpicum et al., CRC Press, Boca Raton2013

Etude sur modèle physique du nouvel évacuateur de crue du barrage de Gage II

Fadi Hachem, Violaine Dugué, Michael Pfister

Suite à des études hydrologies récentes, le barrage de Gage II en France révèle un déficit de capacité d'évacuation des crues. Il a donc été décidé de construire un évacuateur de creue complémentaire en rive droit du barrage. Cet ouvrage est composé d'un P ...

Soc Hydrotechnique France2013

Chute Aerators : Steep Deflectors and Cavity Subpressure

Michael Pfister

Chute aerators are applied to high-velocity spillways to entrain air into the flow so that cavitation damage is avoided. Air entrainment occurs locally at the aerator, whereas further downstream the flow is deaerated. This process is relevant because it de ...

2011

Historical development of side-channel spillway in hydraulic engineering

Michael Pfister

Side-channels are a typical element of earth or rockfill dams to discharge floods sideways instead frontally, such as normally adopted for concrete dams. The side channel received attention from the hydraulics community from the 1920s, once the first large ...

2011

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