Study of the adaptive river management for the nature restoration in Yasumuro River of Hyogo Prefecture

Abstract

This paper briefly reports on the experience of Yasumuro River in Hyogo prefecture and the one of the river’s adaptive management process for the restoration of the sound ecosystem. This challenging is conducted in fiscal 2006 according to the Yasumuro River Restoration Plan, featuring the rare freshwater algal species ʻThorea okadae’ as a symbol.

Firstly, this study gave the required physical conditions for the sound and sustainable environments of the small rivers. Secondly, a two-dimensional unsteady flow analysis model taking into consideration the lodging process of tall herbaceous plants was constructed to get the hydraulic quantities. Also, river channel shapes for keeping the good environment were determined by using the calculation results obtained from the numerical analysis model and test operation was undertaken.

After the test operation, expected transitions were monitored in most instances.