Abstract
The aim of the research is to elucidate suspended sediment transport and their deposition processes especially at river mouth or estuarine area. Several specific features of sedimentary processes during a flood condition have been observed in the field around the Port of Niigata at the mouth of the Shinano river, showing dispersal of highely turbid water in the near surface fresh water layer and formation of fluid mud layer near the bottom at the same time. The hydraulic model experiments were also carried out with a circulating flume to elucidate the fluid mud transport on the steep slope modeling the edge of navigation channel. The experiments also clarified the influence of the halocline on the suspended sediment transport process at river mouth area.
