Adaptive Management of the Post-Restoration in the Kamisaigo River

Abstract

The third-stage restoration of the Kamisaigo River in Fukutsu City has been completed within an urban–agricultural landscape. Through seasonal and long-term monitoring, adaptive management was identified as a crucial strategy for addressing the uncertainties in river restoration. The approach was implemented at the reach scale, where a new model was developed. The purpose of this research is to evaluate and verify the success of the river restoration project over time by assessing the changes in site indicators using the Fish Biological Health Index (FBHI). Following the completion of restoration measures across all reaches, evidence indicated that adaptive management, through the partial reconfiguration of the reach by adding logs and vegetation, had positively influenced river function. According to the biological health assessment, the FBHI values in the third year of restoration demonstrated good to excellent conditions which supported well-adapted species. Continued adaptive management was considered necessary to enhance the conditions in some stations with the goal of improving their biological health from good to excellent. The incorporation of spawning muddy-bottom habitats was proposed as a future research direction to support the ongoing adaptive management efforts. The FBHI is considered a valuable tool for assessing adaptive management performance. To achieve the restoration objectives, it was emphasized that the monitoring program should be maintained regularly, the recent outcomes should be reviewed, and timely adjustments should be applied based on identified shortcomings.

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