Abstract
This paper treats the water quality problem on Hori river, Nagoya, Japan. Matsushige Lock Gate area is a big water area, situated at the middle part of the Hori River. This area is a place where the maximum sludge has been deposited and still during tidal behaviors, this sludge may play a pivotal role to change the water quality. Moreover, the transmitted water form Nakagawa canal has also made the water quality changed at Hori River. Therefore, water quality observations were done at Matsushige and Sanno Bridge, which are up and down streams of this Lock Gate area. From observation results, the inflow discharge from Nakagawa canal has an impact on the water quality of Hori River. Additionally, ADCP is carried out to find the distributions of water velocity along the longitudinal profile of Hori River. Finally, an effective timing of inflow discharge from Nakagawa canal is examined considering tidal change.
