Abstract
In order to establish a restoration technique for eelgrass bed of Zostera marina in coastal region where thick sludge deposit is present, the applicability of granulated coal fly ash as the construction material of the growth base was investigated. Although the granular artificial growth base showed the tendency of being affected by wave actions at low tide, it had eventually stabilize sufficiently. Porous structure of the growth base contributed to the rapid growth of the rhizomes and roots. As a result, it was possible to maintain the eelgrass bed in the region and, in turn, to enhance the stability of the favorable coastal environment. It was concluded that the eelgrass growth base of granulated coal fly ash is an effective technique to establish a stable seagrass bed in coastal waters.