In this study, the kind and the transport characteristics of floating garbage are examined in Hori River located in center part of Nagoya city. By field observation on floating garbage in Hori River, it was found that more than 70% in floating garbage is natural garbage, a lot of artificial garbage appears in downstream area and the most natural garbage are dead trees and grasses entering into Hori River. In addition, from investigation on floating garbage in water area of Matsushige lock, it was seen that water area of Matsushige lock affected prolongation of floating garbage in Hori River. By numerical analysis, it was seen that the transport characteristics of floating garbage in water area of Matsushige lock is the influence of water flow caused by density change of tidal phenomena in Hori River.
