Author(s): M. Tauber; H. Mader
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Keywords: No Keywords
Abstract: As many optimisation inquiries in the past just examined ecological optimisations of Vertical Slot Fishpasses, the present research project also focuses on the economical optimisation–to meet the contrary demands between the EU-wide aim of river continuum restoration at migration barriers (Water Framwork Directive-2000/60/EG) and the aim of enhancing energy production from renewable energy sources (Renewable Energies Directive- 2001/77/EC). The result of various biologic and hydraulic investigations at 1: 5 and 1: 1 hydraulic models is a modified type of the Vertical Slot Fishpass which uses intended losses at roughness obstacles by obtaining isolated roughness flow in between them. Lower flow velocities and reduced turbulences enhance fish passage capability effectively as trials with fish showed. Hydraulic investigations within a 1: 1 hydraulic model with 25 tested different variants yield in a significant reduction of flow velocities and turbulances. In comparison to a standard Vertical Slot Bypass the optimised Multi-Structure Slot principle of the MABA Fishpass shows a clear reduction of flow velocities in the slots, a significant reduction of turbulances, distinct reduction of the energy dissipation rate in the resting pools and therefore a clear enhancement of fish passage capability. As water consumption reduction of the MABA Fishpass was>34% , more water can be used at run-off river hydropower sites directly or for operating a residual flow turbine at diversion sites. In comparison to the Standard Vertical Slot Bypasses the follow up costs are reduced considerably, which makes the MABA Fishpass an extraordinarily economical solution.
Year: 2010