Environmental Hydraulic Engineering

Dear Colleagues,

For the installation of hydraulic structures, migration routes, refuge regions, habitats, and spawning beds for aquatic animals, a balance must be struck between flood control and aquatic habitats. However, there are significant problems in most rivers. After flood stages, facilities of fish passages can be lost (e.g., sediments of rocks and drift wood, the destruction of fish passages, local scouring and degradation of river beds below the fish passage), and it is impossible for aquatic animals to migrate upstream and downstream around a hydraulic structure. Additionally, degradation of river beds might be advanced in channelized rivers, and bedrock without movable gravel might be formed. These problems are significant. From the view point of hydraulic design, the improvement method must be established. In my study, several types of fish passages have been proposed by considering the balance between flood control and aquatic habitats. Additionally, an energy dissipater installed in a low drop structure has been developed in order to prevent the river bed from accumulating movable gravel; thus, the migration route and habitat of aquatic animals might not be disturbed. Additionally, a refuge for aquatic animals can be kept during flood stages. My proposal has been applied in several types of rivers.

Prof. Dr. Yasuda Youichi
Guest Editor

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• flood control
• migration route
• refuge
• hydraulic structures
• stacked boulders