Dimensioning of fish passage structures with perturbation boulders

Abstract

The investigations presented here were carried out at the Technical University of Dresden and the University of Stuttgart in order to optimize the current method for the design of fish passage structures with perturbation boulders. However, in the course of the analyses it was found that the specifications of the relevant German code of practice, DVWK Bulletin 232, did not take adequate account of the leading-edge flow conditions and that there were, in parts, considerable discrepancies between the calculated and the measured values. For this reason, a modified computational approach has been derived theoretically and verified on the basis of model tests. Furthermore, a method has been developed for dimensioning these structures that has already been implemented on the first facilities.

Design of emergent and submerged rock-ramp fish passes

“…The same dependence on C is found between the present study and results of Pagliara et al (2008). For emergent performance, the model with high concentration C = 0.3 provides the same stage-discharge relationship than method from Heimerl et al (2008). Therefore, the model is validated by other studies.…”

“…In Figure 10, the stage-discharge relationship is depicted for a real scale fishway. Comparison with other guidelines (Larinier et al, 2006b;Heimerl et al, 2008) indicates that the model allows to reproducing experimental correlation between h * and q * = q/D 5/2 . The same dependence on C is found between the present study and results of Pagliara et al (2008).…”

“…In Cassan et al (2014), an analytical model was firstly developed for emergent rock-ramp fish pass, where the contribution of drag and bed on energy dissipation was quantified. Compared to previous methods (FAO, 2002;Heimerl et al, 2008), the evolution of the boulder drag coefficient can be estimated as a function of hydraulic parameters (Froude number, block shape and slope).…”

“…Here, a turbulence closure model is proposed to estimate vertical velocity profiles and the turbulent viscosity for a large range of blocks arrangements. The proposed model is also compared to existing experimental stage-discharge correlations (Larinier et al, 2006b;Heimerl et al, 2008;Pagliara et al, 2008).…”

Experimental and field approach to the hydraulics of nature-like pool-type fish migration facilities

“…Although design principles in geometry and many examples of implementation of such NLFs have been presented (Gebler, 1991;DVWK, 1996;Larinier et al, 2002Larinier et al, , 2006, dimensioning of NLFs, e.g. with perturbation boulders (Larinier et al, 2006;Heimerl et al, 2008) or boulder sills (Larinier et al, 2006), has just been proposed in the past few years, and the verification of NLFs' performance has been rarely reported. Additionally, a technical fishway is generally built as a design since concrete is the main material of the structure and the construction accuracy can be controlled.…”