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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Hydro-environment : Experimental study of the influence of sills on vertical slot fishway flow
Experimental study of the influence of sills on vertical slot fishway flow
Author : A. BALLU(1), G. PINEAU(1), D. CALLUAUD(1) & L. DAVID(1)
This paper presents results of an experimental study of the topology, kinematic quantities, turbulence and quantification of
hydraulic parameters of flow inside vertical slot fishway (VSF). A VSF is a device used to facilitate the passage of fish
through many obstacles, such as dams and weirs that can be found across streams, and obstruct their natural migration.
The design of a VSF uses global criteria to accommodate the swimming capabilities of the species of fish that will pass
through it. Notably, the head between pools, the volumetric dissipated power and the discharge coefficient are required. In
practice, those design criteria are calculated without taking into account the possible presence of sills (an insert that
functions like a wier) inside slots. However, existing VSFs often have sills introduced in the slots to restore the balance of
water depth in the pools. In this context, experiments were carried out to estimate the influence of sills on the commonly
used design criteria. Water depth measurements were taken by acoustic sensors in the middle of each pool of a VSF.
Additionally, velocities were acquired by an Acoustic Doppler Velocimeter in several positions of the central pool. A map of
the discharge coefficients and a cartograph of flow topologies were produced over 180 independent experiments,
investigating five inclinations from 5% to 15%, three pool widths, four flow discharges and three sill heights. The results
show that the presence of sills increases the three-dimensionality of the flow and tend to significantly change the flow
topology (Wang et al., 2010). The sill height was found to have an effect on the discharge coefficient. The presence of sills
changes the main design criteria values and could potentially make the passage of migrating fish through VSFs more
difficult. Finally, a sensitivity analysis of the parameters used to estimate the commonly used criteria is proposed. This was
undertaken in order to define predictive laws, which can help designers to develop systems that are as efficient as
possible with the presence of sills.
File Size : 1,275,005 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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