特集:標津川再生事業の概要と再蛇行化実験の評価 FEATURE:Shibetsu River Restoration Project
事例研究 CASE STUDY
標津川における自然再生事業への取り組みについて
平井 康幸*・ 空閑 健
国土交通省北海道開発局釧路開発建設部 〒085-8551 北海道釧路市幸町10−3 Kushiro Development and Construction Dept., Ministry of Land, Infrastructure and Transport, 10-3, Saiwai-cho, Kushiro, Hokkaido 085-8551, JapanAbstract:The Shibetsu River winds through Eastern Hokkaido before emptying into the Okhotsk Sea. The river had many meanders before 1940's, the mountains at the upper reaches used to be covered with natural forest, and a large wetland extended at the lower reaches. After 1950's flood control projects by straightening channel significantly contributed to reduce flood hazard, and the whole floodplain has developed into a dairy farming area. The circumstances of the river and its basin have changed over time, and locals today are calling for restoration of the river to its original state and creation of a river environment where agriculture and fishery, the basin's key industries, can prosper together. In response, the Kushiro Development and Construction Department of the Hokkaido Development Bureau, Ministry of Land, Infrastructure and Transport, has launched nature restoration projects. For these projects, the Advisory Committee for the Shibetsu River Basin Management and the Shibetsu River Technical Committee were founded. These committees are conducting onsite surveys, planning-related prediction and assessment.
Key words: adaptive management, consensus, participation, restoration, Shibetsu River
摘要
標津川流域は,河道の直線化や堤防整備等の治水事業により大きく発展してきたが,一方で河川環境にも大きな影響を与えてきた.時代の変化とともに標津川を取り巻く状況も大きく変わり,治水安全度を確保しながら,自然河川への復元や,流域の主力産業である農業と漁業が共存・共栄できる河川環境,自然環境を活かした地域の活性化等について,地域の意識が高まってきた.これを踏まえ,国土交通省北海道開発局釧路開発建設部では標津川自然再生事業への取り組みを始めるに至った.検討にあたって,地域の代表者等で構成される標津川流域懇談会や学識経験者で構成される標津川技術検討委員会を設立し,議論・検討するとともに,現地試験等を通して計画立案に向けての予測・評価を行っている.
今後,標津川流域懇談会の提言を踏まえ,現地試験等で技術的な面を検討しながら,引き続き,合意形成に向け地域と議論しながら計画を策定していく予定である.
* e-mail: hirai-y2xp@hkd.mlit.go.jp
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