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Title:	Einfluss geometrischer und hydraulischer Parameter auf das Verhalten abwandernder Fische an Wasserkraftanlagen
Abstract:	Für den Schutz abwandernder Fische vor einer schädlichen Turbinenpassage können Rechen-Bypass-Systeme eine wirksame Maßnahme sein. Um möglichst viele Fische auf ihrer abwärtsgerichteten Wanderung durch ein solches System zu schützen, sollten die Verhaltensweisen der Fische bei der Bemessung des Systems Berücksichtigung finden. In ethohydraulischen Untersuchungen mit Aalen, Äschen, Flussbarschen, Lachssmolts und Rotaugen wurden geometrische und hydraulische Parameter eines Vertikalrechens getestet, um über die Kombination aus Verhaltensbeobachtungen der Fische und Strömungsmessungen Erkenntnisse über die Wirkung des Rechens zu ermitteln. Die Ergebnisse der Auswertung der Verhaltensweisen zeigen, dass neben der Anströmgeschwindigkeit vor allem der Rechenstababstand einen maßgebenden Einfluss auf die Filterwirkung eines Rechens und das Suchverhalten der Fische hat. Effect of geometrical and hydraulic parameters on the behaviour of migrating fish at hydropower facilities To protect migrating fish from harmful turbine passages, bar racks and bypasses can be effective mitigation measures. The number of fish that are protected by facilities like these can be increased if the behaviour of fish is considered during its design process. The effect of hydraulic and geometrical aspects of bar racks was tested by means of ecohydraulic studies with eels, graylings, perches, salmons and roaches. The combination of behavioural studies and flow examination offers the possibility to gain insight into parameter-behaviour interactions. These studies proved that apart from the approach velocity the bar rack spacing is the most influential parameter with regard to the screening effect of the bar rack as well as the searching behaviour of fish.
Source:	Bautechnik 95 (2018), No. 12
Page/s:	850-858
Language of Publication:	German

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