Study of key technologies for fishways in the plateaus of western China

Mao, Xi; Li, Jia; An, Ru; Zhao, Weiyang; Li, Kefeng; Li, Ran; Deng, Yun; Liang, Xinlan; Yang, Min; Zhang, Jiehao; Tang, Kai

doi:10.1016/j.gecco.2019.e00755

Cited by 4 publications

(4 citation statements)

References 16 publications

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“…In this study, the main fish-passing objects were schizothorax oconnoris and schizothorax macropogons, both of which belonged to migratory fish. The optimal swimming speed was 0.8 m/s, and the flow rate should be controlled in 0.5-0.8 m 3 /s [1]. For the pool fishway, the water depth of the pool room should be determined by the height and habit of the fish object, generally 1.0-1.5 m. For the natural-like fishways, the water depth in the fishways should be determined according to the ecological habits of the target fish species.…”

Section: Model Testmentioning

confidence: 99%

“…The construction of hydraulic structures, such as gates and dams, alters the natural state of rivers, blocking the migration channels of aquatic organisms, especially fish. Fishways are effective engineering measures that restore fish migration channels [1]. Commonly used fishways can generally be considered either technical fishways or nature-like fishways [2] [3].…”

Section: Introductionmentioning

confidence: 99%

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The Hydraulics of Nature-Like Fishways

Mao

Huang²,

Xu³

et al. 2021

CEJ

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Nature-like fishway arrangements are commonly used because these structures imitate the characteristics of natural rivers and effectively allow fish to migrate past river sections blocked by hydraulic structures. In this paper, physical models were analyzed, and the velocity distributions of two different fishway structures (Types I and II) were compared. Results showed that the maximum mainstream velocity of the Type I structure was 5.3% lower than that of the Type II structure. However, the average mainstream velocity of the Type I structure was 21.1% greater than that of the Type II structure. The total per-cycle length of the mainstream path in the Type II structure was 2.1 times greater than that of the Type I structure, which indicated that the length of the mainstream path was somewhat proportional to the average velocity of the mainstream. When the flow rate was kept constant, increases in the velocity of the main flow associated with changes in the internal structure of the fishway decreased the average velocity of the main flow, while decreases in the total length of the flow path led to increases in the average velocity of the main flow. Due to frictional head loss along the fishway and local head loss, as well as the overlaps between these factors, the overall flow rate gradually decreased every cycle, despite periodic fluctuations.

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Section: Model Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Hydraulics of Nature-Like Fishways

Mao

Huang²,

Xu³

et al. 2021

CEJ

Self Cite

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“…However, the efficiency of the fish passage can vary depending on the type and location relative to the dam structure [2]. For example, some researchers noted [3][4][5] that many fish passage facilities do not fulfill their targets for fish passage [1,3] especially for small individuals (i.e. ≤100 mm), including for cyprinids, which can form large aggregations below the barriers of the watercourse.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, it was show [2] that the peak use by fish of these fishways can vary both in the seasonal and in the diurnal aspect [6,7]. For the successful exploitation of fish passages, it is proposed [4] to evaluate various environmental parameters: quantitative descriptions of flow velocity, turbulence and other hydraulic indicators, as well as take into account swimming possibilities, morphology, and other characteristics of migratory fish species [1]. In this regard, it is necessary [8,9]: to combine studies of the behavioral characteristics of fish and hydraulic flow indicators when determining the characteristics of a fish passage, and also use software for hydrodynamic modeling.…”

Section: Introductionmentioning

confidence: 99%

Distribution of cyprinids in the stream during their spring upstream migration

Chemagin¹

2020

E3S Web Conf.

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The researches were carry out by stationary and mobile hydroacoustic computerized complexes in the floodplain-riverbed complex of the Irtysh River (Western Siberia, Russian Federation). It was established that during the migration period during the spring flood, patterns of distribution of fish in the stream are observe due to the size-taxonomic characteristics of the fish population and the physiological capabilities of the organism of fish. With an increase in the flow velocity characteristic from the near bank part of the river to its midstream, the proportion of cyprinids in the watercourse decreases, and the proportion of fish with body sizes> 15 cm increases. The number of fish smaller at high-speed sections of the river increases with an increase in water temperature, which in turn indicates the increasing physiological capabilities of representatives of Cyprinidae family. Absolute numerical dominance of migratory fish and the largest proportion of cyprinids were observed in the low velocity section of the river, located closer to the shore. The indicator of the proportion of cyprinids have a direct strong correlative relationship with the temperature factor (0.70-0.73, P<0.05).

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A novel index-based method associated with aquatic ecosystem for evaluating river longitudinal connectivity: A case study for cascade dams in the Yalong River, China

Yang,

Bu,

et al. 2023

Ecological Indicators

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Study of key technologies for fishways in the plateaus of western China

Cited by 4 publications

References 16 publications

The Hydraulics of Nature-Like Fishways

The Hydraulics of Nature-Like Fishways

Distribution of cyprinids in the stream during their spring upstream migration

A novel index-based method associated with aquatic ecosystem for evaluating river longitudinal connectivity: A case study for cascade dams in the Yalong River, China

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