An Assessment of Effects and Durability on Nature Restoration of Oku-River in Okinawa Island

A nature restoration project on the Oku River in Okinawa Island successfully restored the habitat of Ryukyu-ayu, a fish species extinct in the wild on the island. The project involved removing drop structures and restoring pools by withdrawing riverbanks to prevent water leakage and revive riffle-pool structures. Investigations confirmed improved fish habitats and riverbed forms, while numerical simulations demonstrated that these changes maintained the original longitudinal profile of the river and sustained pool functions for at least a decade. This study highlights effective strategies for long-term ecological restoration in riverine ecosystems.

MIYARA, K., AKAMATSU, Y., YUNO, T., MIYAMOTO, M., KAMIYA, D., & SHIMATANI, Y. (2015). AN ASSESSMENT OF EFFECTS AND DURABILITY ON NATURE RESTORATION OF OKU-RIVER IN OKINAWA ISLAND. Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering), 71(4), I. https://doi.org/10.2208/jscejhe.71.i_1135