Simulation of scour and deposition in the flow field and adaptability of fishes around eco-friendly notched groins

Ma, Donghao; Zhou, Junwei; Wang, Zhenhong

doi:10.1016/j.jhydrol.2022.127754

Cited by 3 publications

(2 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Mohammad-Hosseinpour et al 28 determined the effects of meandering curvature and gravel pits interactions on maximum scour depth. Ma et al 29 conducted experiments on scour and deposition around notched groins to maintain navigation functions while taking into account the river ecosystem and analyzed the suitability of the habitat for fish.…”

Section: Introductionmentioning

confidence: 99%

Model experiments on hydraulic properties around multiple piers with reproduced 3D geometries

Sato

2022

Sci Rep

View full text Add to dashboard Cite

The effects of multiple piers with 3D geometries on water levels during floods, as well as riverbed fluctuations and local scour after floods were examined via hydraulic model experiments. The Kintaikyo Bridge in Japan, a world-famous historical triple-wooden-arch bridge, was modeled at a scale of approximately 1/276. The number of model piers was set to four, as in the real bridge, and they were 3D printed and installed in the sand layer of an open channel. To provide adequate information on the pier installation conditions and hydraulic response, four cases were studied in the experiments, primarily considering present pier conditions; the previous conditions of the Kintaikyo Bridge were also considered. The experimental conditions in these four cases depended on whether foundations were present, the piers were skewed against the flow center, and the shape was spindle or similar to that of the present case. In the current bridge condition where foundations are present and there is no skew, water level rise, riverbed fluctuation, and local scour were suppressed. Furthermore, the statistical analysis of the results suggested that riverbed fluctuations are more stable after flooding. The two piers with foundations had smaller scour areas than those without. Further, those with foundations generally had lower mean scour at the pier perimeters. Regarding those without foundations, there were no differences in riverbed fluctuations or local scour due to the skewed pier angle. In addition, the representative length of the pier with a 3D geometry was determined by dividing the projected area of the pier below the initial sand surface in the main flow direction by the pier height, and the relationship between the Froude number or the mean water depth and the maximum scour depth was investigated.

show abstract

Section: Introductionmentioning

confidence: 99%

Model experiments on hydraulic properties around multiple piers with reproduced 3D geometries

Sato

2022

Sci Rep

View full text Add to dashboard Cite

show abstract

“…It is abundantly obvious from the results that by lowering the dike orientation angle from 90° to 45°, the velocity profiles are moved upward and the depth of the scour hole is reduced by 5-10% for every 10 angle decrease. [30] examined the water surface profile, flow rate, scour, and deposition pattern near environmentally friendly notched groins. The results show an essential change in the flow pattern at the notches generated in the middle of localized overflow groins.…”

mentioning

confidence: 99%

Optimal flow pattern around hybrid groins with various orientations to improve fish habitat via Experimental Investigation using Acoustic Doppler Velocimeter

Mostafa

Ameen

Mohamed

et al. 2023

SVU-International Journal of Engineering Sciences and Applicati

View full text Add to dashboard Cite

Given the growing interest in river restoration and natural river improvement, groins are recommended as an essential hydraulic component for creating riparian habitats and controlling local flow. The optimum design of groins for environmental purposes is still not defined despite its long history of improving river flow dynamics. The primary goal of this paper is to determine the influence of hybrid groins' orientation angle and geometry on both the flow velocity and structure to enhance fish habitat. This study investigates six models of unsubmerged hybrid L-shape groins installed in a straight channel with a deformed bed. The hybrid L-shape groins consist of two parts, an impermeable part that objected to the flow, and a permeable one (piles rows) arranged in the flow direction. The influences of groin's both contraction/length ratio and orientation angle on the flow velocity and structure are studied. The contraction ratio represents the impermeable groin length relative to channel width (W/B), while the orientation angle (θ) is the groin inclination angle in the up/downstream direction. Groin models with 25% contraction ratio and up/downstream orientation angle (θ) of 45°, 60°, and 90° were used. Groin with an orientation angle of 45° toward downstream has introduced the highest reduction on the flow velocities. Also, groin with θ=90° downstream introduced low velocities, but these velocities still more than the reduction of 45° case. The area of the dead zone -the zone of low velocities-in the case of θ=45° is about 70 % more than that of θ=90°.

show abstract

Effects of the Diversity of Flow Velocity on the Upstream Migration Behavior of Grass Carp in the Reaches of Spur Dikes

Hu,

Wang,

Chen

et al. 2023

Water

View full text Add to dashboard Cite

The construction of spur dikes alters the flow pattern of rivers and affects the upstream migration behavior of fishes. Traditional rock-fill spur dikes and experimental permeable spur dikes with a “Weighted Excess Storage” (WES) profile were evaluated using hydrodynamic experiments and experiments on the upstream migration behavior of juvenile Grass Carp (Mylopharyngodon idella). The swimming ability and upstream migration paths of juvenile Grass Carp in the spur dike were analyzed, and the relationship between the upstream migration success rate of Grass Carp and the diversity of flow velocity was studied. The induced velocity and critical velocity of juvenile Grass Carp with a body length of 5 ± 0.5 cm are 0.1 m/s and 0.7 m/s according to the experiment. The flow velocity diversity index increased roughly in a power function trend with the increase in flow discharge, and under the same flow conditions, the flow velocity diversity index of permeable spur dikes was greater than that of rock-fill spur dikes. When the flow velocity was within the preferred velocity range of Grass Carp, the success rate of upstream migration increased linearly with the diversity of flow velocity. When the velocity was greater than 60% of the critical velocity of Grass Carp, the success rate of upstream migration dropped sharply. Compared with rock-fill spur dikes, the experimental permeable spur dikes provide a passage for the upstream migration of fishes and reduce the impact on the upstream migration of fish. The results of this research provide theoretical support for ecologically optimized designs of spur dikes and the ecological management of rivers.

show abstract

Simulation of scour and deposition in the flow field and adaptability of fishes around eco-friendly notched groins

Cited by 3 publications

References 22 publications

Model experiments on hydraulic properties around multiple piers with reproduced 3D geometries

Model experiments on hydraulic properties around multiple piers with reproduced 3D geometries

Optimal flow pattern around hybrid groins with various orientations to improve fish habitat via Experimental Investigation using Acoustic Doppler Velocimeter

Effects of the Diversity of Flow Velocity on the Upstream Migration Behavior of Grass Carp in the Reaches of Spur Dikes

Contact Info

Product

Resources

About