IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Hydro-environment : Comparison between crossbar block ramp and vertical slot fish pass via numerical 3d cfd simulation
Comparison between crossbar block ramp and vertical slot fish pass via numerical 3d cfd simulation
Due to the European Water Framework Directive (EU-WFD, 2000) all water bodies have to be restored into ¡°good¡±
ecological conditions. To fulfil these requirements in order to hydro-morphological conditions the river¡¯s patency may not
be interrupted and may allow aquatic organisms to pass the river upstream. Therefore, technical fish passes are built to
overcome large river bottom differences, which allow fish to migrate freely. Fish passes can be constructed in various
ways. To overcome the height difference a number of stepped pools separated by walls are built, whereby the
construction of the walls can vary. As a nature-like solution (rough channel) so called crossbar block ramps with small,
shifted openings for the water discharge and fish passing can be constructed. Vertical slot passes represent a technical
fish pass solution. Both variations can be found in practical applications. The present paper analyses two types of fish
passes as a practical solution between the rivers Wakenitz and Trave in L¨¹beck, Germany, via numerical 3D CFD
simulation. Both, Wakenitz and Trave, are anthropogenic modified since more than one century. Currently, the flow from
Wakenitz to Trave conducts through a culvert system and patency is not given. Hence, a solution is necessary to
guarantee a fish climb capability. Therefore, a 3D numerical CFD model of a crossbar block ramp and a vertical slot
pass will be compared to analyse hydraulic boundary conditions and the possibilities for fish to pass. Indicators like
water depths, flow velocities and flow structures are in the focus of interest.
File Size : 832,363 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Hydro-environment
Date Published : 18/08/2015
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