Sediment Erosion and Deposition in the Former Arase Dam Reservoir Under the Dam Removal Project

Ohtsuki, Kazuaki; Iyooka, Hiroki; Nihei, Yasuo; Yoshimori, Yusuke; Nakamura, Shunsuke; Onikura, Norio

doi:10.2208/jscejhe.72.i_853

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…However, only 9% of dam removals in the United States were scientifically evaluated, and most of these studies focused on the hydrologic and geomorphic responses, with short evaluation (<4 years) and limited (1-2 years) or no pre-removal monitoring [8]. Studies on the geomorphic responses of the Kuma River to the first Japanese high-dam removal (the Arase dam removal project) recently began [9,10]. In Europe, there have been fewer studies on dam removal compared to the number of dam removal projects [1].…”

Section: Introductionmentioning

confidence: 99%

Time Series Changes in Fish Assemblages and Habitat Structures Caused by Partial Check Dam Removal

Nagayama

Ishiyama

Seno

et al. 2020

Water

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Despite a steep increase in dam removal projects, there are few studies on the biophysical responses to dam removal. In this study, we evaluated the short-term (1.5 years) and long-term (5.5 years) effects of partial check dam removal on fish assemblages and their habitats. First, the habitat preferences of fish were examined at a channel unit scale: pools, rapids, and side channels satisfied the seasonal habitat requirements of the fish assemblages. Partial check dam removal increased the abundance of these habitats and diversified the habitat structures owing to the sediment release from the dam; in contrast, the bedrock distinctly decreased 1.5 years after dam removal. However, 5.5 years after dam removal, the bedrock proportion increased, and the habitat structures were simplified again owing to the re-transportation of sediments. Similar temporal changes were also determined through a reach-scale analysis with a change in the bed materials. Anadromous Oncorhynchus masou began to spawn and recolonize in the upstream section of the dam after the dam removal, causing similar assemblage compositions between the downstream and upstream sections. The abundance of Salvelinus malma and Noemacheilus barbatulus toni in the upstream reaches decreased over time after the dam removal. The temporal changes in the biophysical responses suggest that long-term monitoring is indispensable for the reliable evaluation of dam removal effects.

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Section: Introductionmentioning

confidence: 99%

Time Series Changes in Fish Assemblages and Habitat Structures Caused by Partial Check Dam Removal

Nagayama

Ishiyama

Seno

et al. 2020

Water

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“…The first large-dam removal in Japan was conducted from 2012-2018, and removed the Arase dam in the Kuma River. Following this project, monitoring included geomorphic changes of deposited sediment or downstream channels [26,27], sediment transport characteristics [28], and ecological responses [29]. On the other hand, sediment replenishment downstream of dams is being conducted in different parts of the country, including the investigation of geomorphic change to channels [30][31][32] and the responses of fish, macroinvertebrates, and algal biomass [33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Effects of Sediment Released from a Check Dam on Sediment Deposits and Fish and Macroinvertebrate Communities in a Small Stream

Itsukushima

Ohtsuki

Sato

et al. 2019

Water

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Dam removal is typically intended for river restoration or as a countermeasure for aging dams. The influence of dam removal has mainly been studied in large rivers. This study is intended to investigate the influence of the sediment supplied after opening a check dam drain in a small steep stream to contribute to the establishment of sediment release technology form check dam by accumulating the basic knowledge about the influence of sediment release. Deposited sediment in the impoundment was rapidly discharged immediately after opening the drain outlet, and a moderate sediment discharge followed. The water course of the sediments deposited by repeated channel widening and riverbed degradation tended to stop longitudinal topographic changes from downstream. In addition, the turbidity during a flood was high in the first year and tended to decrease in the second year. As for the ecosystem response, changes in the benthic macroinvertebrate community were confirmed in downstream sites, and net-spinning species especially deceased immediately after the sediment supply began. Our monitoring results suggest that the increasing turbidity was suppressed during the flood because sediment release was conducted from the small-scale facility. As a result, a negative impact on the aquatic ecosystem seemed to be reduced.

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Temporal changes in benthos at intertidal zones' communities in the Kuma River system: ecological monitoring before, during, and after the Arase dam removal

Inui

Iyooka

Minagawa

et al. 2022

Ecology and Civil Engineering

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Sediment Erosion and Deposition in the Former Arase Dam Reservoir Under the Dam Removal Project

Cited by 3 publications

References 2 publications

Time Series Changes in Fish Assemblages and Habitat Structures Caused by Partial Check Dam Removal

Time Series Changes in Fish Assemblages and Habitat Structures Caused by Partial Check Dam Removal

Effects of Sediment Released from a Check Dam on Sediment Deposits and Fish and Macroinvertebrate Communities in a Small Stream

Temporal changes in benthos at intertidal zones' communities in the Kuma River system: ecological monitoring before, during, and after the Arase dam removal

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