Julian Meister


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Meister

First Name

Julian

ORCID

0000-0002-2715-6780

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2017 - 2019102020 - 202216
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Publications1 - 10 of 26
  • Fish protection and guidance at water intakes with horizontal bar rack bypass systems
    Item type: Monograph
    Meister, Julian (2020)
    VAW-Mitteilungen
  • Curved-Bar-Rack-Bypass-Systeme für den Fischschutz an Wasserkraftanlagen und Wasserfassungen
    Item type: Journal Article
    Beck, Claudia; Albayrak, Ismail; Leuch, Claudia; et al. (2021)
    WasserWirtschaft
    Ein neuartiger Fischleitrechen mit vertikalen, gebogenen Stäben und anschließendem Bypass-System (BS) stellt eine vielversprechende technische Lösung für den Fischabstieg an Laufwasserkraftwerken dar. Dieses sogenannte Curved-Bar-Rack-Bypass-System (CBR-BS) zeichnet sich durch geringe hydraulische Verluste, eine symmetrische Rechenabströmung und eine hohe Fischleiteffizienz im Labor aus. Dieser Beitrag präsentiert die Forschungsergebnisse der Laborversuche und der numerischen Modellierung zum neu entwickelten CBR-BS.
  • Fischschutz und Fischabstieg: Neueste Erkenntnisse aus der Forschung
    Item type: Conference Paper
    Meister, Julian; Beck, Claudia; Fuchs, Helge; et al. (2019)
  • Hydraulik von Bypässen für den Fischabstieg
    Item type: Conference Paper
    Beck, Claudia; Meister, Julian; Albayrak, Ismail; et al. (2021)
    VAW-Mitteilungen ~ Wasserbau-Symposium 2021, Wasserbau in Zeiten von Energiewende, Gewässerschutz und Klimawandel. Band 2: Hochwasserschutz Sihl, Zürichsee, Limmat; Wasserbauliches Versuchswesen und Messtechnik; Fischökologie; Flussmorphologie
  • Hydraulic performance of fish guidance structures with curved bars – Part 1: head loss assessment
    Item type: Journal Article
    Beck, Claudia; Albayrak, Ismail; Meister, Julian; et al. (2020)
    Journal of Hydraulic Research
    The hydraulic performance of fish guidance structures such as louvres and angled bar racks is an important design criterion to achieve high fish guidance efficiencies with a minimum impact on hydropower production. The current geometrical designs of such structures result in high head losses and asymmetric turbine admission flow and hence need to be optimized. We therefore developed an innovative curved bar design for fish guidance structures and experimentally investigated different rack configurations in a laboratory flume. The present paper (Part I) focuses on the hydraulic performance of the novel curved-bar racks with regard to head losses, while in the companion paper (Part II) we report the results on the flow fields. The effects of the main rack angle, bar angle, bar spacing, bar depth, and top or/and bottom overlays were systematically studied. The curved bar shape leads to significantly lower head losses compared to straight bar shapes. An existing head loss prediction formula was extended to account for the new bar shape and the application of overlays.
  • Hydraulische Laboruntersuchungen horizontaler Fischleitrechen
    Item type: Journal Article
    Meister, Julian; Fuchs, Helge; Boes, Robert (2018)
    ZeK Hydro
  • Bemessungsempfehlungen für den Fischschutz mit Horizontalrechen-Bypass-Systemen
    Item type: Journal Article
    Meister, Julian; Beck, Claudia; Albayrak, Ismail; et al. (2021)
    WasserWirtschaft
    Obwohl Horizontalrechen-Bypass-Systeme (HBR-BS) dem Stand der Technik für den Fischschutz und Fischabstieg entsprechen und in den letzten Jahren an vielen europäischen Wasserkraftanlagen installiert wurden, gibt es immer noch diverse Wissenslücken bezüglich der Hydraulik, den betrieblichen Aspekten und des Fischverhaltens. Aus diesem Grund wurden an der Versuchsanstalt für Wasserbau, Hydrologie und Glaziologie (VAW) der ETH Zürich umfangreiche hydraulische und ethohydraulische Untersuchungen durchgeführt. In diesem Beitrag werden die wichtigsten Forschungsresultate der ethohydraulischen Versuche präsentiert und wichtige Bemessungsempfehlungen zusammengefasst, während die hydraulischen Untersuchungen und systematische Verlegungsversuche mit Laub in einem anderen Beitrag in diesem Heft der WasserWirtschaft präsentiert werden.
  • Horizontal Bar Rack Bypass Systems for Fish Downstream Migration: State of Knowledge, Limitations, and Gaps
    Item type: Conference Paper
    Meister, Julian; Fuchs, Helge; Albayrak, Ismail; et al. (2018)
    Proceedings of the 12th International Symposium on Ecohydraulics
    Following the implementation of the European Water Framework Directive, fish downstream migration has rapidly gained importance in recent years. A number of small-to medium-sized hydropower plants in Europe were equipped with horizontal bar rack bypass systems (HBR-BS) in the past decade. Nevertheless, hardly any systematic studies have been conducted so far to optimize and verify these state of the art downstream fish passage facilities. The present contribution gives an overview of the state of the art of fish downstream migration in Europe, identifies relevant research questions, and describes current laboratory investigations conducted at the Laboratory of Hydraulics, Hydrology, and Glaciology (VAW) of ETH Zurich.
  • Effect of bypass layout on guidance of downstream moving fish at bar rack bypass systems
    Item type: Conference Paper
    Boes, Robert; Beck, Claudia; Meister, Julian; et al. (2022)
    Proceedings 39th IAHR World Congress
    Hydropower plants act as a barrier to fish moving in rivers. Fish guidance structures like angled bar racks with horizontal or vertical bars are used to protect downstream moving fish from turbine passage, guiding them to a bypass as an alternative passage corridor. The function of the bypass system is to safely collect, carry and reintroduce the fish to the river downstream of the barrier. An effective bypass design is essential to ensure both fish protection and guidance to the tailwater. Most importantly, a bypass must be designed according to the swimming capacity and behavior of the target fish species. A gradual velocity increase into the bypass leads to high acceptance, being a prerequisite for high fish guidance efficiencies. The bypass entrance should be easily found, accepted and passed by all fish species without harm, delay, flight or exhaustion. The findings of two recent studies on bar rack bypass systems with (i) curved vertical and (ii) horizontal bars of different spacing indicate, amongst others, that an open channel bypass was quickly accepted by fish for mild velocity gradients at the inlet. In contrast, restrictor and pipe bypasses led to backwater with low flow velocities and high local velocity gradients in front of the bypass opening(s), leading to an avoidance reaction of fish. Although most available guidelines recommend a bypass discharge as a percentage of the water intake discharge, the present results suggest that the spatial velocity gradient in front of the bypass is the decisive parameter for an efficient bypass design to be quickly accepted by fish.
  • Fishfriendly Innovative Technologies for hydropower (FIThydro)
    Item type: Other Conference Item
    Meister, Julian; Beck, Claudia; Fuchs, Helge; et al. (2018)
Publications1 - 10 of 26