Abstract
The catches of the short-necked clam decrease for sedimentation of the sludge remarkably in the estuary tidal flats of the Hiroshima delta. On the other hand, a steel sheet pile is set up for revetment to prepare for a disaster. The groundwater which flow out underground of the tidal flats was stopped at the landside by a steel sheet pile. And it is assumed that the environment of the tidal flats changes.
The fishery grounds of the short-necked clam spread a granulated coal ash (GCA) on thickness of 0.3m in the ebb water route of the tidal flats and built it. By laying of the GCA, the biota is turning into the environment where various creatures inhabit. 12 months after laying of the GCA, the habitation of the short-necked clam was confirmed. It was confirmed that the overlaying sand of the GCA might build the environment where the habitation of the short-necked clam was possible.
