| In the Satsunai River, many groins have been built as countermeasures of stabilizing the water channels for the
purpose of flood control. But recently, gravel riverbeds are rapidly disappearing because of the said countermeasures.
Stabilization of channels might simplify the hydraulic characteristics and deteriorate habitat conditions of water species,
therefore immediate countermeasures are being required. In this study, I investigate quantity of creature and physics. In
addition, I analyze findings and make the index that used a quantity of no dimension. Furthermore, I apply this index in
an ecosystem evaluation model and evaluate the influence that void of a gravel gave to river environment from a respect
of habitation environment. |
