Abstract
Formation of poor oxygenation at the bottom layer water and sediment in the semi-closed water zone near urban area is a typical agenda and many findings have been reported. However, most of them target sea area and there are few reports on the urban river mouth. In this study, to clarify the characteristics of a time change of oxygen consumption rate at urban river mouth, laboratory experiments were conducted. Sampling spot was Ikuta River mouth in Kobe City, Japan. In this river mouth, fluvial artificial lagoon is created. In each the laboratory experiment, time change of dissolved oxygen of sediment both of fluvial artificial lagoon and main stream was measured. From the series of laboratory experiments, the oxygen consumption rate at fluvial artificial lagoon is larger than at main stream.
