2013 Volume 19 Pages 423-428
Wetland of Nakashima has been almost completed by the three years digging project started in 2008. The present nature restoration capability is evaluated in terms of both wetland configuration and generation of flora and fauna. The major conclusions are as follows. A shoal area suitable for inhabitation of fishes and wetland plants was increased by the collapse of riverbank during the flood. Assumed elevation (i.e. comparable height difference from ordinary-water level) and evaluation community of wetland plant were estimated by Jacobs selectivity index. Consequently, elevation assumed in the design phase was validated.70% of fishes live in floodplain of Onga River.Adaptive management was proposed that minimizes the digging for the designed wetland shape if the area of comparable height difference is balanced.
