Abstract
In the recent years, restoration of tidal flat has been carried out in Japan. In those cases, we need an environmental goal of restoration project. However, it is difficult to remake past condition. The Imazu Tidal Flat in the sphere of the Fukuoka City has prospered from ancient times, and a lot of historical materials including the kitchen midden has been accumulated. In this research, we investigated the historical change of physical environment and human impact relationships in the Imazu tidal flat, and it was clarified that the tidal flat and person's relations were close from ancient times to 1975's. It was thought the cause of the deterioration of the tidal flat was that a sandy tidal flat had become mud, but the excavation shellfishes' situations gave proof that the muddy tidal flat had existed from from ancient times. Our results provided an important evidence for restoration of tidal flat of various places.
