Abstract
The Great East Japan Earthquake generated a huge tsunami and accident of nuclear power plant which caused drastic changes of coastal environments. It is necessary to clarify the current situation of water quality and ecosystem in coasts after the tsunami and discuss the countermeasures for improvement of coastal environments.
For this purpose, in the special session, field studies for the variations of coastal environments due to the tsunami were reviewed. The environmental impacts due to the tsunami on water and sediment qualities and ecosystem were discussed. Importance for continuous monitoring of coastal environments during a long time is again recognized.
