Multi slot versus single slot pool-type fishways: A modelling approach to compare hydrodynamics

Quaresma, Ana L.; Romão, Filipe; Branco, Paulo; Ferreira, Maria Teresa; Pinheiro, António N.

doi:10.1016/j.ecoleng.2018.08.006

Cited by 30 publications

(35 citation statements)

References 56 publications

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“…Thus, to assess the effects of hydrodynamics on the fish behavior, numerical modelling (the 3D CFD model FLOW-3D ® ) was used in this study to characterize influential hydrodynamic variables, such as velocity magnitude, TKE, and water depths, present in each configuration tested, in order to identify areas of high velocity and turbulence gradients that might have affected the fish movements. Over the last few years, 3D CFD models have proved to be a practical and robust tool to characterize hydrodynamics on several hydraulic structures, being widely used for the assessment of fish passages (e.g., studies on functioning over a wide range of discharges, prediction of suitable conditions for fish), optimization of designs, and evaluation of different retrofitting solutions [52][53][54][58][59][60][61][62][63][64]. However, given that uncertainty in CFD modelling for environmental fluid mechanics in complex flow fields, like the flow field in the vicinity of a macro-scale roughness (e.g., wake region), can arise from a very wide range of sources, care should be taken when performing a numerical model study [65].…”

Section: Discussionmentioning

confidence: 99%

“…This method is used to represent obstacles through fractional areas and volumes in the fixed orthogonal grid. Flow Science [50] presents additional details regarding the theoretical and numerical fundamentals of FLOW-3D ® , which has been used in recent years to characterize flow hydrodynamics in ecohydraulics and fishway research (e.g., [52][53][54]).…”

Section: Hydrodynamic Modellingmentioning

confidence: 99%

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Assessment of Retrofitted Ramped Weirs to Improve Passage of Potamodromous Fish

Amaral

Quaresma

Branco

et al. 2019

Water

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The addition of substrates to small instream obstacles, like low-head ramped weirs, has been considered a useful management solution to retrofit those structures and enhance fish passage. Substrate dimensions and spatial arrangement, together with discharge, and consequently water depths, appear as important factors for the creation of hydrodynamic conditions that may facilitate the successful passage of fish, though related studies are scarce to support decision-making. This study assessed the influence of discharge (Q) and different retrofitting designs (RD) on the upstream passage performance of a potamodromous cyprinid, the Iberian barbel (Luciobarbus bocagei). Different substrates (small boulders, large boulders, cobbles) and spatial arrangements (aligned, offset) were tested. Numerical modelling was performed to characterize the hydrodynamics. Results indicate that Q and RD influenced the upstream negotiation of ramped weirs. Cobbles randomly distributed along the ramp (Nature design) was the most successful configuration, recording the highest number of upstream passages. Low velocities along the ramp, and low turbulence downstream, were registered in this configuration, indicating that the use of natural substrate may help to increase the permeability of ramped weirs to fish movements. The outcomes from this work can help engineers and biologists to design more appropriate passage structures for low-head instream obstacles.2 of 18 after assessment, could not be removed, have undergone rehabilitation works to include ramps in their designs (e.g., [11,12]). This design reconfiguration enables water to pass over the ramp, not generating a waterfall [5,10], a condition that may afford a more holistic negotiation by fish [5,13]. Nevertheless, fish swimming abilities, which are closely related to fish guilds and body size [14][15][16][17], and hydrodynamic conditions, such as water depth, discharge, and turbulence present over the ramp and in the vicinity of the structure [5,[18][19][20], are key factors that influence the permeability of such structures to fish movements.The addition of substrates to instream obstacles and fish transposition devices, commonly referred to as retrofitting, has been considered a useful management solution to enhance upstream fish passage [5,[21][22][23][24][25][26][27][28]. The placement of substrates in culverts to mimic natural stream conditions and facilitate fish passage has been successfully implemented since the early 1970s [29]. In low-head ramped weirs, natural substrates like pebbles, cobbles, or boulders, are frequently used as retrofitting solutions to increase the bed roughness, and consequently promote energy dissipation, creating localized zones of low-velocity and turbulence [23][24][25]30] that may be used by fish as resting areas during the upstream negotiation of ramps [20,27,[31][32][33]. These low velocities may be especially important to species of weaker swimming capabilities, such as potamodromous cyprinids [5,21,22]. Substrate dimensions and spatial arrang...

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Section: Discussionmentioning

confidence: 99%

Section: Hydrodynamic Modellingmentioning

confidence: 99%

Assessment of Retrofitted Ramped Weirs to Improve Passage of Potamodromous Fish

Amaral

Quaresma

Branco

et al. 2019

Water

Self Cite

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“…Pool-type fishways consist of a sloping-floor channel separated by cross-walls into a series of pools, so that the height to be negotiated by the fish is divided into several small drops [12]. The first devices of this type date back to the nineteenth century [10,13], with many design variations (mainly changes in the pool geometry or in the openings between pools) developed since then (e.g., [16][17][18][19][20]).…”

Section: Introductionmentioning

confidence: 99%

Pool-Type Fishway Design for a Potamodromous Cyprinid in the Iberian Peninsula: The Iberian Barbel—Synthesis and Future Directions

et al. 2020

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The Iberian barbel (Luciobarbus bocagei) is one of the most common cyprinids in the Iberian Peninsula, whose migratory routes are often hampered by anthropogenic barriers. Fishways might be an effective mitigation measure if they integrate designed operational characteristics that account for the biomechanical requirements of this species. Understanding the flow conditions inside the fishway, and how barbel responds to the hydrodynamics of the flow is imperative to improve free migratory routes with minimum energetic cost associated. Herein, we analyze and synthesize the main findings of research on pool-type fishways for upstream passage of the Iberian barbel and derive recommendations of design criteria for pool-type fishways for this species and others of similar biomechanics capacities. Ultimately, we identify research needs to improve upstream passage of this species.

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“…Some studies, such as Cea et al (2007) and Stamou et al (2018), have sought to evaluate other types of turbulence models for RANS simulations in fishways. There are also some large-scale simulation (LES) approaches to estimating the flow in fishways, such as Fuentes-Pérez et al (2018) and Quaresma et al (2018). However, RANS simulations have lower computational costs and are more accessible (TAJNESAIE et al, 2018).…”

Section: Turbulence Kinetic Energymentioning

confidence: 99%

Three-dimensional numerical simulation of flow in vertical slot fishways: validation of the model and characterization of the flow

Sanagiotto

Rossi

Lauffer

et al. 2019

RBRH

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Vertical slot fishways allow energy dissipation as a function of the pool, longitudinal slope, baffle and vertical slot design. The mean and turbulent flow patterns in these structures must be compatible with the fish target. The design of these structures is commonly based on previous successful fishways as well as simplified theoretical equations and empirical relationships. To aid in the design of these structures, a three-dimensional hydrodynamic model was used to simulate the flow, and experimental studies were used to validate the model. The mean velocities, pressures and parameters indicative of turbulence were analyzed. The maximum flow velocities were up to 32% higher than the values obtained using a simplified theoretical equation. The evaluation of the volumetric dissipated power indicated that the mean value for the pool was lower than 150 W/m3; however, analysis of the spatial distribution showed that in some areas, the values can exceed 1000 W/m3. The results indicate that the numerical simulation was able to adequately represent the flow considering the computational cost involved. Accordingly, it can be used as a complementary tool for the design of new fishways and for the analysis of modifications in existing ones.

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Multi slot versus single slot pool-type fishways: A modelling approach to compare hydrodynamics

Cited by 30 publications

References 56 publications

Assessment of Retrofitted Ramped Weirs to Improve Passage of Potamodromous Fish

Assessment of Retrofitted Ramped Weirs to Improve Passage of Potamodromous Fish

Pool-Type Fishway Design for a Potamodromous Cyprinid in the Iberian Peninsula: The Iberian Barbel—Synthesis and Future Directions

Three-dimensional numerical simulation of flow in vertical slot fishways: validation of the model and characterization of the flow

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