2021 Fiscal Year Final Research Report

Multi-scale mathematical modeling of fish migration in river and channel networks

Research Project

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Project/Area Number	19H03073
Research Category	Grant-in-Aid for Scientific Research (B)
Allocation Type	Single-year Grants
Section	一般
Review Section	Basic Section 41030:Rural environmental engineering and planning-related
Research Institution	Kyoto University
Principal Investigator	Fujihara Masayuki 京都大学, 農学研究科, 教授 (40253322)
Co-Investigator(Kenkyū-buntansha)	一恩英二石川県立大学, 生物資源環境学部, 教授 (10320912) 泉智揮愛媛大学, 農学研究科, 准教授 (40574372) 吉岡秀和島根大学, 学術研究院環境システム科学系, 助教 (70752161) 長野峻介石川県立大学, 生物資源環境学部, 講師 (90646978) 泉完弘前大学, 農学生命科学部, 教授 (60132007)
Project Period (FY)	2019-04-01 – 2022-03-31
Keywords	水域ネットワーク / 数値流体力学 / バイオテレメトリー / 魚道 / 落差工 / 手取川 / 斐伊川
Outline of Final Research Achievements	Quantification of the effects of hydraulic structures such as weirs and gates in rivers or channels on the swimming behavior of fish is one of the most important issues in the functional evaluation of water networks from an ecological point of view. In this study, based on the observation data using the biotelemetry method, the approach method that combines the micro information of the water flow and the swimming behavior of fish in the vicinity of the structure with the macro information of the water area network scale is used. We made a mathematical model that simulates the fish ascending behavior in the Shichika irrigation canal of the Tedori River. In addition, based on the measured data of Ayu (sweetfish) and flow conditions in the Hii River, we constructed the optimal transport theory for the migration of fish schools that occur in the water network area.
Free Research Field	地域環境工学
Academic Significance and Societal Importance of the Research Achievements	河川横断構造物が魚類の移動に影響を与えていることは容易に想像できるが，水域ネットワーク全体としての影響については，対象とするスケールの違いから水理構造物を明示的には扱われず評価されてきた．本研究はそのギャップを埋めるところに学術的意義がある．そして，各種水利構造物の魚類移動に与える影響評価は，自然との調和が要請される土地改良事業においても有益な情報を与えることから社会的意義も大きい．