上西郷川における間伐材を用いた河道内自然再生工法の導入と評価

抄録

The aim of this study is to evaluate in-stream restoration method that made from timber log and rock in Kamisaigo river. We conducted fish sampling survey from 2011 (before restoration) through 2012(after restoration). We also conducted physical environment survey and habitat classification survey to assess the environmental condition change of the stream.

From the result, average fish richness was significantly raised from 2011 to 2012. Also habitat variation and physical environment were diversified by the restoration method (log structure). From an economic point, log structure could be installed without heavy equipment that log structure can be constructed cheaply and conveniently by human power.