浚渫砂を用いた干潟造成による環境改善効果について

抄録

The Ministry of Land, Infrastructure and Transport and Aichi Prefecture are jointly involved in various environmental rehabilitation and creation projects inside Mikawa Bay. New tidal flats and shallow waters have been created and capping has been conducted through the utilization of high quality dredged sand arose from the development of Nakayama waterway. Results from the monitoring survey showed improvement in sediment quality and disappearance of oxygen depleted water column in the tidal flat of Mito district. Also diversity of bivalves and other benthic organisms have increased in the tidal flat area, suggesting an improvement of the habitat environment. Furthermore, analysis of the nitrogen cycle in the tidal flat suggested that suspension feeders such as bivalves have an important role in the water purification process of tidal flats. Therefore increase in bivalve abundance will likely result in the improvement of water purification ability of the tidal flat area