2008 Volume 14 Pages 447-452
The severe depletion of river flow harms aquatic ecosystem, while hydropowers divert a lot of water from Shinano River. One of the main issues on river environment in the middle reach of Shinano River is that the warming of river-flow caused by the depletion of river flow in summer damages the habitat of fishes.
This study drew the water temperature distribution map based on the observation of water temperature in the surface and bottom of river flow, and found that the short stretch of river has both suitable and inhospitable environments for fish in view of water temperature. It also found the suitability for the fish habitat related to water temperature. The technique for assessing the suitability horizontally distributed for the fish habitat in the case of various river flow regime was developed based on those findings already stated.
