Abstract
Terrigenous nutrients and turbidity transported by rivers are important sources to affect the water quality in the neighboring coastal area. However the behavior near river mouths are not well known because of the physical and chemical influences by seawater intrusion. To get better understandings of the behavior, this study executed field observations at the Abukuma River mouth. The measurements show a thin mixing layer on the saltwater wedge, the change of the thickness by the intrusion distance and the tidal phase, and the distributions of turbidity having peaks near the mixing layer. Major part of nitrogen and phosphorus during flood is found in fine particles in the flow.
