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2002 Fiscal Year Final Research Report Summary

Influence of the construction of Nagaragawa Barrage on habitats and ecosystems in the estuary

Research Project

Project/Area Number 13305035
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Civil and environmental engineering
Research InstitutionKanazawa University (2002)
The University of Tokyo (2001)

Principal Investigator

TAMAI Nobuyuki  Kanazawa University, Dept, of Civil Eng., Prof., 工学部, 教授 (90010818)

Co-Investigator(Kenkyū-buntansha) TAKEMON Yasuhiro  Kyoto Univ., Water Resources Center, Disaster Prevention Research Institute, Assoc. Prof., 防災研究所水資源研究センター, 助教授 (50222104)
FUJITA Yuichiro  Gifu Univ., River Basin Science Center, Prof., 流域圏科学研究センタ, 教授 (90027285)
ARITA Masamitsu  Tokyo Denki Univ., Faculty of Science and Engineering, Prof., 理工学部, 教授 (90130294)
YAMAUCHI Katsusuke  Gifu Univ., Faculty of Education, Prof., 教育学部, 教授 (30021322)
MURAKAMI Tetuo  Nagoya Women's Univ., Faculty of Domestic Science, Assoc, Prof., 家政学部, 助教授 (50329695)
Project Period (FY) 2001 – 2002
KeywordsNagaragawa Barrage / stratification / post construction monitoring / chrolophil concentration / fine organic material / brook type fishway / planktonic algae
Research Abstract

Major results obtained by this research group are summarized as follows.
1) Exhaustive study both on five-year monitoring data and other existing field data clarified a present situation that the upstream of the Barrage is fresh water zone and the downstream of the Barrage is sea water zone with no blackish zone. Salinity distribution downstream of the Barrage changed from mixed type to fully mixed type almost all days through a year.
2) Recorded total number of fish species is 94 within which 16 species disappeared and 19 species appeared newly during 1994 through 1999. Altered ratio of fish species amounted to 37% and especially blackish species were affected greatly to disappear.
3) A major component that governs the dissolved oxygen concentration in an estuary is a tidal cycle with disturbance of floods. Large floods recover DO concentration but bring about low DO conditions after floods by the intrusion of anoxic water body from Ise Bay.
4) Complete mixing including the bottom water did not occur every day, maintaing temporary thermal stratification for a few days in summer. Judging from the rapid oxygen consumption rate by the water column, such temporary thermal stratifications could cause frequent oxygen deficits in the impoundment of the Barrage in summer.

  • Research Products

    (22 results)

All Other

All Publications (22 results)

  • [Publications] 玉井信行: "長良川河口堰モニタリング調査を評価する"応用生態工学. 5巻・1号. 1-3 (2002)

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  • [Publications] 藤野智亮, 中村由行: "長良川河口堰下流部における貧酸素水塊の形成に関する解析"水工学論文集. 46巻. 923-928 (2002)

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  • [Publications] 中村由行, 藤野智亮: "長良川河口堰下流部の溶存酸素濃度の動態"応用生態工学. 5巻・1号. 73-84 (2002)

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  • [Publications] 中村由行, 栗木秀治, 藤野智亮: "河川域における溶存酸素濃度の動態-長良川河口堰下流部におけるモニタリングデータの解析-"港湾空港技術研究所報告. 41巻・3号. 19-48 (2002)

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  • [Publications] 小出水規行: "長良川河口堰魚道の遡上魚類集に関するモニタリングデータの解析"河川技術に関する論文集. 8巻. 331-336 (2002)

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  • [Publications] 安田陽一, 大津岩夫, 小出水規行: "既設の固定堰に設置する透過型簡易魚道の提案"河川技術に関する論文集. 8巻. 349-354 (2002)

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  • [Publications] 村上哲生: "長良川河口堰建設後の浮遊藻類の発生とその環境影響"応用生態工学. 5巻・1号. 41-51 (2002)

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  • [Publications] 村上哲生, 服部典子: "長良川河口堰淡水域における一時的な水温成層の形成"応用生態工学. 4巻・2号. 179-184 (2001)

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  • [Publications] 村上哲生, 服部典子, 藤森俊雄, 西條八束: "夏季の長良川河口堰下流部の貧酸素水塊の発達と解消"応用生態工学. 4巻・1号. 73-80 (2001)

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  • [Publications] 村上哲生: "河口堰で何がおこっているのか?"科学. 71巻・7号. 895-901 (2001)

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  • [Publications] 山内克典: "長良川河口堰が長良川下流域の底質および二枚貝に与えた影響"応用生態工学. 5巻・1号. 53-71 (2002)

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  • [Publications] Tamai, N.: "Evaluation of the five-year monitoring in the operation stage of the Nagaragawa estuary barrage"Ecology and Civil Engineering. Vol.5,No.1. 1-3 (2002)

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  • [Publications] Fujino, T. and Nakamura, Y.: "Development of anoxic water in the lower reaches of the Nagara Revermouth Barrage"Annual Journal of Hydraulic Engineering. Vol.46. 923-928 (2002)

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  • [Publications] Nakamura, Y. & Fujino, T.: "Dynamics of dissolved oxygen concentration in the lower reaches of a rivermouth barrage of the Nagara River"Ecology and Civil Engineering. Vol.5,No.1. 73-84 (2002)

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  • [Publications] Nakamura, Y. Kuriki, H. & Fujino, T.: "Dynamics of dissolved oxygen in an estuary-Analysis based on monitoring data obtained in the lower reaches of a rivermouth barrage of the Nagara River"Report of the Port and Airport Research Institute. Vol.41,No.3. 19-48 (2002)

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  • [Publications] Koizumi, N.: "Statistical analysis of monitoring data for fish community ascended fishways in the Nagaragawa Estuary Barrage"Advances in River Engineering. Vol.8. 331-336 (2002)

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  • [Publications] Yasuda, Y., Ohtsu, I. & Koizumi, N.: "Proposal of convenient fishway with small gabions in a constructed weir"Advances in River Engineering. Vol.8. 349-354 (2002)

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  • [Publications] Murakami, T.: "Development of planktonic algae and its environmental impacts subsequent of construction of the Nagara Rivermouth Barrage"Ecology and Civil Engineering. Vol.5,No.1. 41-51 (2002)

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  • [Publications] Murakami, T. & Hattori, N.: "Formation of temporary thermal stratification in impoundment of the Nagara Rivermouth Barrage"Ecology and Civil Engineering. Vol. ,No.2. 179-184 (2001)

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  • [Publications] Murakami, T. Hattori, N. Fujimori, T. & Saijo, Y.: "Development and disappearance of hypoxic water in the lower reaches of a rivermouth barrage on the Nagara River in summer"Ecology and Civil Engineering. Vol.4,No.1. 73-80 (2001)

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  • [Publications] Murakami, T.: "What is happening at estuary barrages?"Science, Iwanami Publisher. Vol.71,No.7. 895-901 (2001)

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  • [Publications] Katsusuke Yamauchi: "Effects of the Nagara Rivermouth Barrage on the river-bed sediment and bivalves in the lower reaches of the Nagara River"Ecology and Civil Engineering. Vol.5,No.1. 53-71 (2002)

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Published: 2004-04-14  

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