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 : Hydraulic characteristics of meander-type fish passes
Hydraulic characteristics of meander-type fish passes
The construction of meander-type fish passes can ensure a river¡¯s passableness. In general we can distinguish between
the most frequently employed types, namely C-, J- and H-type. The basic design consists of an alignment of staggered
circular basins. Each basin is connected to its neighbour by a slot of variable width. This arrangement creates a
meandering main current. Although a large number of meander-type fish passes have already been built, the typical
hydraulic characteristics of basins or basin alignments are largely unknown. Because current standards or regulations
offer no detailed procedures on how to calculate flow velocity, Torricelli¡¯s simplified law is presently used for hydraulic
approximation. The manufacturer¡¯s own empirical data on the design of the fish passes is currently the sole basis for any
hydraulic calculation and design. Small discharges Q appear to be sufficient to facilitate the migration of a wide variety
of fish species. The determination and compliance of the dominant hydraulic characteristics requires detailed
measurements and 3d-hydronumerical simulations. A first reference facility (H-type, River Oker, 20 basins) was selected
and studied in some detail. The investigations included field measurements and 3d-hydronumerical simulations.
Additionally, the same pass was simulated 3d-hydronumerically as virtual C- and J-type full-size models. At present a Ctype
is also being investigated by field measurements (River Nethe, 27 basins). The main goal is to collect data on this
C-type-facility under diverse conditions (variation of discharges, impact of season, with/without aquatic flora) and to
analyse the hydraulic characteristics (water level, current, sensitivity). In parallel, the pass is simulated 3dhydronumerically
as a full-size model to verify the gathered data.
File Size : 3,183,240 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Hydro-environment
Date Published : 13/08/2015
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