〒901-2111 沖縄県浦添市字経塚720) 2 正会員 博(工) 山口大学大学院准教授 理工学研究科(〒755-8611 山口県宇部市常盤台2-16-1) 3 正会員 (株)建設技術研究所 九州支社河川部 (〒810-0041 福岡市中央区大名2-4-12 CTI福岡ビル) 4 非会員 沖縄県環境科学センター 環境科学部(〒901-2111 沖縄県浦添市字経塚720) 5 正会員 博(工) 琉球大学助教 工学部環境建設工学科(〒903-0213 沖縄県西原町千原1) 6 正会員 博(工) 九州大学大学院教授 工学府(〒819-0395 福岡市西区元岡744番地) A nature restoration project has been conducted in the Oku River in the northern part of Okinawa Main Island. The purpose of this project is to restore the habitat of Ryukyu-ayu, which is extinct in the wild in

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... inawa Main Island. The removal of drop structure and the restoration of pool by withdrawing the river bank were conducted to prevent the water leak as subsoil water and revive the structure of riffle and pool. The restoration for fish habitat was indicated by the results of investigation on fish and riverbed forms. These river improvements were evaluated in terms of bed deformation using numerical simulation. The results of numerical simulation indicate that the removal of drop structure induces the change of the longitudinal profile into original one, and the restored pool maintains the function as a pool over the next ten years.