Author(s): Ianina Kopecki; Eff A. Tuhtan; Matthias Schneider; Johannes Ortlepp; Stefan Thonhauser; Martin Schletterer
Linked Author(s): Matthias Schneider
Keywords: Ttraction flow; Ethohydraulics; Fish passage; Hydrodynamic modelling; Rheotaxis
Abstract: Local detectability is one of the key aspects in establishing functional fish passage structures. Here we present a novel method as extension of the habitat analysis system CASi Mi R for assessing the attraction flow of a vertical slot fish pass. The method combines state-of-the-art two-dimensional hydrodynamic modelling with findings from ethohydraulics. Computed flow velocity fields are evaluated using the “ethohydraulic diagram” allowing for the determination of regions with flow velocities below rheotaxic thresholds as well as those exceeding the critical velocity of target fish species. Additionally, computed pathlines allow for the analysis of possible upstream migration paths assuming ideal rheotaxis. The method allows for an adaptive fish passage design including the optimization of an entrance position and geometry in conjunction with the amount of attraction flow.
Year: 2014