Abstract
The area of Tatsukushi bay in Ashizuri Uwakai National Park, is famous for its high coverage of coral community and existence of various ecosystems. However, large volume of mud and soil flowed into the bay by the flooding in 2001 and settled down on the sea bottom. The sediment that remains in the bay now gave serious influences on the coral community.
This research aimed at the development of the device to separate fine grains from sediment efficiently, and to remove fine grains on the sea bottom. We researched, manufactured and developed the practical device for the purpose through the site experiment and the basic examination lasting for several years, and used it in the nature restoration project in 2007 fiscal year.
As a result, it was verified that the sediment of about 20cm on the sea bottom was removed.
We believe that the development of this method and device could be applied to improve deteriorated tidal flat where sediment settled down etc. and other environmental restorations themes in the future.
