特集: 魚道の評価 FEATURES: EVALUATION OF FISHWAYS
総説 REVIEW
魚がのぼりやすい川づくり推進モデル事業の現状と課題
森川一郎
(財)リバーフロント整備センター 〒102-0075 東京都千代田区三番町3-8 Foundation for Riverfront Improvement and Restoration, 3-8 Sanban-cho, Chiyoda-ku, Tokyo, 102-0075, JapanAbstract:Based upon the "Model projects for promotion of enhanced environments for ascent of fish'' that was begun in 1991, obstacles to upriver migration of fishes from cross-river structures such as weirs have been gradually improved. Along with these changes improvements have also been made along rivers that are not among the rivers in the model project. However, there remain many issues such as entrainment countermeasures, responses to high dams, and evaluations of type of fishways that require research and technology development, because some of this technology is still under development, and the spread and use of the technology in the field is still insufficient. In addition there are other types of issues, such as the fact that means for verifying the improvement results have not been systematized. When pushing ahead with future projects, spreading the experience and knowledge gained on the model rivers, conducting further surveys and investigations, and supporting flexible responses and devices at actual field sites will be indispensable.
Key words: fishway, upstream migration, model project, improvement
摘要
1991年から始められた,「魚がのぼりやすい川づくりモデル事業」により,堰等の河川横断施設による魚類の遡上阻害が順次改善されてきているとともに,モデル河川以外においても改善が進められようとしている.しかし,迷入対策,ハイダムへの対応,各形式の評価等,研究・技術開発の必要な課題も多く,発展途上の技術でもあるため,現場への技術の普及も未だ十分ではない.また遡上効果の確認手法についても体系化にいたっていないなど種々の課題を有している.
今後の事業の推進に当たっては,モデル河川における経験・知識の普及を図るとともに,さらなる調査検討を行い,現場における柔軟な対応・工夫を支援していくことが不可欠である.
e-mail: morikawa@rfc.or.jp
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