抄録
Combined sewer overflow (CSO) has a major impact on water and benthic environments of rivers where CSO inflows. In this study, field surveys and laboratory analyses of water and sediment quality were carried out to clarify the influence of CSO on water qualities in an urban tidal river in Osaka City. Moreover, numerical simulation using a 3-D hydrodynamic model was also conducted to clarify the behavior of CSO pollution load in the river channel. Results indicated a strong possibility that suspended sediment delivered with CSO deposited immediately and affected water quality such as hypoxia in the channel near the CSO outlet.
