Experimental Investigation of the Reynolds Shear Stress Exceedance Rate for the Injury and Disorientation Biocriteria Boundary in the Pool-Orifice and Vertical Slot Type Fishways
Abstract
:1. Introduction
1.1. State-of-the-Art Review
1.2. Aim of the Paper
2. Methodology
- Injury boundary—medium turbulence condition (>50 N/m2) that can induce minor injury to some species, but does not incur significant mortality over 48 h post-exposure period;
- Disorientation boundary—low turbulence condition (>30 N/m2) that may cause a startle response that would likely put the fish at risk of predation or other hazards.
2.1. Experimental Setup
2.2. Flow Velocity Measurement Technique
3. Results
4. Discussion
5. Conclusions
- RSS distribution across the 3 planes suggest that a streamwise RSS component is significantly larger than the horizontal and vertical component. In the PO fishway, τuw is higher than concurrent τuv and τvw by 67% and 61% on average, respectively. In the VS fishway, τuw is higher than concurrent τuv and τvw by 92% and 86% on average, respectively. Horizontal and vertical RSS components are similar, with average differences between them at 3% for all fishways and not exceeding 44% in the PO fishway and 14% in the VS fishway;
- A majority of all analyzed fishway configurations have been observed to have favorable conditions for fish passage, according to Odeh et al.’s biocriteria boundaries. All PO fishways have RSS values below the injury boundary across the entire pool, while the disorientation boundary is exceeded only for orifices o10 and o12. For all VS fishways, the disorientation boundary is exceeded by a streamwise RSS component, while the injury boundary is exceeded for l60 and all slopes. τuv and τvw do not exceed the disorientation boundary, but are close to it (>20 N/m2) for all VS fishway configurations;
- In the PO fishways RSS is inversely correlated with the orifice size and is correlated with its proximity to the main flow jet: all RSS components are observed to increase with the increase of the orifice size (while retaining the same bottom slope and pool length) and all RSS components are increasing from plane A towards plane C. A change in slope and pool length has no significant influence on the change in RSS values for PO fishways;
- In the VS fishways, RSS is inversely correlated with the bottom slope: all RSS components are observed to increase with the decrease in the bottom slope. All RSS components are decreasing from plane A towards plane C. A change in the pool length has no significant influence on the change in RSS values for VS fishways;
- A fraction of the RSS values below the biocriteria boundaries is reducing with the increase in the orifice size for PO fishways and with the increase of pool length in the VS fishways. A fraction of RSS values below the biocriteria boundaries in the VS fishway is significantly lower than in the counterpart PO fishway.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
List of Symbols and Abbreviations
i075 | fishway configuration with bottom slope of 7.5% |
i100 | fishway configuration with bottom slope of 10% |
i125 | fishway configuration with bottom slope of 12.5% |
l45 | fishway configuration with pool length of 45 cm |
l60 | fishway configuration with pool length of 60 cm |
l90 | fishway configuration with pool length of 90 cm |
o8 | pool-orifice fishway configuration with orifice size of 8 cm × 8 cm |
o10 | pool-orifice fishway configuration with orifice size of 10 cm × 10 cm |
o12 | pool-orifice fishway configuration with orifice size of 12 cm × 12 cm |
Plane A | plane parallel to the fishway bottom near the surface of the flow |
Plane B | plane parallel to the fishway bottom in the middle of the flow |
Plane C | plane parallel to the fishway bottom near the bottom of the pool |
PO | pool-orifice fishway |
RSS | Reynold’s shear stress |
VS | vertical slot fishway |
u | streamwise velocity component [m/s] |
u′ | fluctuation of the streamwise velocity component u [m/s] |
v | spanwise velocity component v [m/s] |
v′ | fluctuation of the spanwise velocity component v [m/s] |
w | vertical velocity component w [m/s] |
w′ | fluctuation of the vertical velocity component w [m/s] |
ρ | water density [kg/m3] |
τuw | Reynold’s shear stress in the streamwise plane [N/m2] |
τuv | Reynold’s shear stress in the horizontal plane [N/m2] |
τvw | Reynold’s shear stress in the vertical plane [N/m2] |
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Fishway | Orifice | Bottom Slope | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
i075 | i100 | i125 | ||||||||
Pool Length | ||||||||||
l45 | l60 | l90 | l45 | l60 | l90 | l45 | l60 | l90 | ||
PO | o8 | 87/98 | 75/92 | 81/96 | 87/96 | 91/98 | 82/93 | 74/92 | 89/93 | 81/94 |
o10 | 56/80 | 74/93 | 58/83 | 76/90 | 71/92 | 67/83 | 77/90 | 64/79 | 63/87 | |
o12 | 63/84 | 53/79 | 45/70 | 65/82 | 55/79 | 58/76 | 64/84 | 52/75 | 51/76 | |
VS | 18/59 | 27/46 | 57/82 | 23/56 | 17/42 | 62/79 | 40/62 | 32/62 | 78/94 |
Fishway | Orifice | Bottom Slope | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
i075 | i100 | i125 | ||||||||
Pool Length | ||||||||||
l45 | l60 | l90 | l45 | l60 | l90 | l45 | l60 | l90 | ||
PO | o8 | 97/100 | 95/99 | 94/98 | 97/100 | 96/99 | 97/99 | 92/98 | 96/100 | 98/99 |
o10 | 82/93 | 93/98 | 82/93 | 96/99 | 91/98 | 96/100 | 92/98 | 90/97 | 94/99 | |
o12 | 87/98 | 82/95 | 76/91 | 88/97 | 83/95 | 80/94 | 89/97 | 79/92 | 86/96 | |
VS | 86/96 | 66/85 | 69/89 | 93/98 | 71/85 | 69/89 | 90/97 | 77/90 | 72/84 |
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Gilja, G.; Ocvirk, E.; Fliszar, R. Experimental Investigation of the Reynolds Shear Stress Exceedance Rate for the Injury and Disorientation Biocriteria Boundary in the Pool-Orifice and Vertical Slot Type Fishways. Appl. Sci. 2021, 11, 7708. https://doi.org/10.3390/app11167708
Gilja G, Ocvirk E, Fliszar R. Experimental Investigation of the Reynolds Shear Stress Exceedance Rate for the Injury and Disorientation Biocriteria Boundary in the Pool-Orifice and Vertical Slot Type Fishways. Applied Sciences. 2021; 11(16):7708. https://doi.org/10.3390/app11167708
Chicago/Turabian StyleGilja, Gordon, Eva Ocvirk, and Robert Fliszar. 2021. "Experimental Investigation of the Reynolds Shear Stress Exceedance Rate for the Injury and Disorientation Biocriteria Boundary in the Pool-Orifice and Vertical Slot Type Fishways" Applied Sciences 11, no. 16: 7708. https://doi.org/10.3390/app11167708