Long-term changes in riparian forest cover under a dam-induced flow scheme: the accompanying a numerical modelling perspective

Nallaperuma, Bhagya; Asaeda, Takashi

doi:10.1080/24705357.2019.1663714

Cited by 11 publications

(7 citation statements)

References 22 publications

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“…Miyanaka Intake Dam is located at the midstream of the river, 134 km upstream from the river mouth. In the upstream and midstream reaches of rivers located near mountainous areas, the surface of the river channel bed is often composed of gravel and bed load [47][48][49][50]. A relatively large amount of sediment is generated upstream of the Miyanaka Intake Dam because of the floods.…”

Section: Study Areamentioning

confidence: 99%

Effectiveness of New Rock-Ramp Fishway at Miyanaka Intake Dam Compared with Existing Large and Small Stair-Type Fishways

Masumoto

Nakai²,

Asaeda

et al. 2022

Water

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The migration of fish is influenced by the unique environmental characteristics of the destination and migratory habitat preferences. There are three fishways in Miyanaka Intake Dam. The rock-ramp fishway was newly established in 2012, creating an environment with different flow velocities and water depths. The purpose of this study was to investigate the effectiveness of the new rock-ramp fishway for native fish through two surveys. In the first survey, traps were installed during the survey period in all three fishways and all fish were caught. The run-up environment was quantified by measuring the flow velocity. In the second survey, fish were caught by spectrum methods upstream and downstream from the dam. It was found that bottom-dwelling fish and swimming fish not bound to the bottom with low migration abilities used the rock-ramp fishway for migration and as a habitat. After the new rock-ramp fishway was built, catches increased upstream from the dam. Further, the rock-ramp fishway is a potential habitat for certain species, such as Cottus pollux. As this is the first study to demonstrate the effectiveness of rock-ramp fishways, the research results are expected to be valuable to fishery managers and those planning river engineering projects.

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Section: Study Areamentioning

confidence: 99%

Effectiveness of New Rock-Ramp Fishway at Miyanaka Intake Dam Compared with Existing Large and Small Stair-Type Fishways

Masumoto

Nakai²,

Asaeda

et al. 2022

Water

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“…Environmental flow assessment, including effects from climate change in rivers (Morid et al 2019) and protection of biodiversity and endemic species in a spring-fed urbanized stream (De-Miguel-Gallo et al 2019) Long-term changes in riparian vegetation cover at pre-and post-dam construction phases (Nallaperuma and Asaeda, 2019) Better understanding of flow interactions with aquatic macrophytes using a high-resolution stereoscopic PIV field measurement system (Biggs et al 2019) Use of remote sensing for dispersion studies in river channels, including potential for dispersion of larvae (Legleiter et al 2019) Historical synthesis on the use of fishways in China, their monitoring and performance challenges, as well as recent renewed interest in effective fish passage (Liu et al 2019) Review of ecohydraulics and ecohydrology as integrative disciplines and their complementary roles in river science (Gosselin et al 2019)…”

Section: International Contributions In Advancing Ecohydraulicsmentioning

confidence: 99%

International contributions in advancing ecohydraulics

Fukuda

Tanaka

Yasuda

et al. 2019

Journal of Ecohydraulics

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“…Dams are necessary for the operation of hydroelectric power plants, but they impede fish movement in rivers (Dockery et al, 2020; Klopries et al, 2020; Nallaperuma & Asaeda, 2019). The electricity generated by hydroelectric power plants is indispensable to human society as a renewable energy source.…”

Section: Introductionmentioning

confidence: 99%

Preferential behavior of Tribolodon hakonensis for fishways according to biological characteristics

Masumoto

Nakai²,

Asaeda

et al. 2023

River Research & Apps

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In 2012, the fishway in the Miyanaka Intake Dam in Niigata Prefecture, Japan, was reconstructed and divided into three fishways (ice‐harbor‐, stair‐, and rock‐ramp‐type) with different flow velocities and water depths. We conducted an adaptive monitoring survey in these fishways from 2012 to 2020, and 33 fish types were found, including migratory, swimming, small swimming, and benthic fishes. Many species displayed a preference for specific fishways. The run‐up for Tribolodon hakonensis was studied to determine the effects of physical parameters such as body length, rush speed for instantaneous swimming, water temperature, and presence/absence of nuptial coloration on fishway preference. T. hakonensis with nuptial coloration had greater body length and higher rush speeds than those without it. They also preferred the ice‐harbor fishway, whereas their shorter, uncolored counterparts preferred the stair and rock‐ramp alternatives. The environmental conditions selected by T. hakonensis changed according to their growth stage, as did fishway preference. Changes in fishway environmental conditions may have influenced the observed differences in fishway populations. It was thus confirmed that developing fishways with different flow velocities and water depths is effective in supporting the various life stages of T. hakonensis.

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Long-term changes in riparian forest cover under a dam-induced flow scheme: the accompanying a numerical modelling perspective

Cited by 11 publications

References 22 publications

Effectiveness of New Rock-Ramp Fishway at Miyanaka Intake Dam Compared with Existing Large and Small Stair-Type Fishways

Effectiveness of New Rock-Ramp Fishway at Miyanaka Intake Dam Compared with Existing Large and Small Stair-Type Fishways

International contributions in advancing ecohydraulics

Preferential behavior of Tribolodon hakonensis for fishways according to biological characteristics

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