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Dr. Bernhard Gems
Unit of Hydraulic Engineering, University of Innsbruck, 6020 Innsbruck, Austria

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Research Keywords & Expertise

0 River Engineering
0 Sediment Transport
0 Dam Break
0 Cascading hazard processes
0 Flood risk and protection

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Journal article
Published: 17 August 2021 in Water
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Hydropower is an important source of renewable energy. Due to ageing infrastructure, more and more existing hydropower plants have to be refurbished and modernised. This includes a complete review of the design parameters as well as the change of specific parts. Investments should be targeted to improve the overall performance of hydropower plants and ensure a long lasting life extension. This paper presents the concept of the submerged wall as a local high point in the headrace tunnel, which can—in combination with the intake gates—replace existing penstock shutoff valves. Such a replacement was conducted for the hydropower plant Schneiderau in Austria, which also allowed us to prove the concept based on measurements including a simulated break of the penstock. The presented solution can help to reduce investment costs and also minimise maintenance efforts and therefore is an attractive option for classic penstock shutoff valves for comparable projects.

ACS Style

Roman Gabl; Markus Wippersberger; Jakob Seibl; Christian Kröner; Bernhard Gems. Submerged Wall Instead of a Penstock Shutoff Valve—Alternative Protection as Part of a Refurbishment. Water 2021, 13, 2247 .

AMA Style

Roman Gabl, Markus Wippersberger, Jakob Seibl, Christian Kröner, Bernhard Gems. Submerged Wall Instead of a Penstock Shutoff Valve—Alternative Protection as Part of a Refurbishment. Water. 2021; 13 (16):2247.

Chicago/Turabian Style

Roman Gabl; Markus Wippersberger; Jakob Seibl; Christian Kröner; Bernhard Gems. 2021. "Submerged Wall Instead of a Penstock Shutoff Valve—Alternative Protection as Part of a Refurbishment." Water 13, no. 16: 2247.

Journal article
Published: 22 June 2021 in Water
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Discharge behavior at side weirs is significantly influenced by the water surface profile along the weir crest. In the past century, different approaches were developed to describe this profile and the associated discharge coefficients. However, the application of these methods to practical problems poses a particular challenge, as a complex three-dimensional funnel is formed due to the discharge reduction, leading to significant uncertainties in determining the relevant flow depth. For this reason, a new approach for the determination of the discharge coefficient of side weirs was developed that refers to the undisturbed normal flow depth in the main channel. Based on a comprehensive parametric study utilizing 3D-numerical simulations, the influence of the weir and channel characteristics on the discharge behavior at the side weir was analyzed. A revised formula for estimating the discharge coefficient for side weirs with multiple weir fields was derived using multiple regression analyses. Validation of the numerical simulations was carried out by applying a physical scale model, showing good agreement between the results.

ACS Style

Adrian Lindermuth; Théo Ostrander; Stefan Achleitner; Bernhard Gems; Markus Aufleger. Discharge Calculation of Side Weirs with Several Weir Fields Considering the Undisturbed Normal Flow Depth in the Channel. Water 2021, 13, 1717 .

AMA Style

Adrian Lindermuth, Théo Ostrander, Stefan Achleitner, Bernhard Gems, Markus Aufleger. Discharge Calculation of Side Weirs with Several Weir Fields Considering the Undisturbed Normal Flow Depth in the Channel. Water. 2021; 13 (13):1717.

Chicago/Turabian Style

Adrian Lindermuth; Théo Ostrander; Stefan Achleitner; Bernhard Gems; Markus Aufleger. 2021. "Discharge Calculation of Side Weirs with Several Weir Fields Considering the Undisturbed Normal Flow Depth in the Channel." Water 13, no. 13: 1717.

Book chapter
Published: 11 April 2014 in Computational Engineering
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The main focus of the chapter is to present various case studies, showing the link between Computational Fluid Dynamics (CFD) and traditional scale model tests in the laboratory. The goal is to illustrate the possibilities and limitations when coupling these two different methods in the context of hydraulic engineering applications. The topics range from hydraulic investigations where numerical simulations are a vital tool for model validation (optimisation and quantification of local head losses, the capacity of a spillway and as a third example impulse waves caused by an avalanche), to modelling of debris flow and log jam processes, including bed load transport issues. The use of such hybrid approaches can contribute to cost-saving and realisation of more complex investigations in shorter time.

ACS Style

R. Gabl; B. Gems; M. Plörer; R. Klar; T. Gschnitzer; S. Achleitner; M. Aufleger. Numerical Simulations in Hydraulic Engineering. Computational Engineering 2014, 195 -224.

AMA Style

R. Gabl, B. Gems, M. Plörer, R. Klar, T. Gschnitzer, S. Achleitner, M. Aufleger. Numerical Simulations in Hydraulic Engineering. Computational Engineering. 2014; ():195-224.

Chicago/Turabian Style

R. Gabl; B. Gems; M. Plörer; R. Klar; T. Gschnitzer; S. Achleitner; M. Aufleger. 2014. "Numerical Simulations in Hydraulic Engineering." Computational Engineering , no. : 195-224.

Journal article
Published: 28 August 2013 in Österreichische Wasser- und Abfallwirtschaft
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Durch die Verwendung von zusätzlichen 3D-numerischen Untersuchungen können die hydraulischen Berechnungen des Triebwasserwegs von Hochdruckwasserkraftanlagen verbessert werden. Anhand von drei Beispielen werden exemplarisch die Möglichkeiten aufgezeigt, welche sich durch eine solche vertiefte Betrachtung ergeben. Dabei handelt es sich um eine Oberkammer, eine asymmetrische Düse und eine Anbindung eines sich im Bau befindenden neuen Teils einer Wasserkraftanlage mit einem bestehenden Druckstollen. Für die Rohrströmungen wurde ANSYS-CFX verwendet und die Simulation des Füll- und Entleerungsprozesses erfolgte mit FLOW-3D. Local 3D numerical simulations are useful additions to a global assessment of hydropower plants. This paper presents an overview and three sample cases, which were conducted as part of a recent modernization project involving an existing high-head power plant operated by the TIWAG (Tiroler Wasserkraft AG). ANSYS-CFX software was used to evaluate the connection between the headrace power tunnel and the new surge tank, including the penstock and the asymmetric orifice in the surge tank. For the third example, FLOW-3D software was used to assess an upper chamber of the surge tank.

ACS Style

Di Dr. Roman Gabl; Di Dr. Stefan Achleitner; Di Dr. Bernhard Gems; -Ing. Johann Neuner; Univ.-Prof. Markus Aufleger. Numerische Berechnung von Hochdruckanlagen: global betrachtet – lokal verbessert. Österreichische Wasser- und Abfallwirtschaft 2013, 65, 348 -353.

AMA Style

Di Dr. Roman Gabl, Di Dr. Stefan Achleitner, Di Dr. Bernhard Gems, -Ing. Johann Neuner, Univ.-Prof. Markus Aufleger. Numerische Berechnung von Hochdruckanlagen: global betrachtet – lokal verbessert. Österreichische Wasser- und Abfallwirtschaft. 2013; 65 (9-10):348-353.

Chicago/Turabian Style

Di Dr. Roman Gabl; Di Dr. Stefan Achleitner; Di Dr. Bernhard Gems; -Ing. Johann Neuner; Univ.-Prof. Markus Aufleger. 2013. "Numerische Berechnung von Hochdruckanlagen: global betrachtet – lokal verbessert." Österreichische Wasser- und Abfallwirtschaft 65, no. 9-10: 348-353.