Abstract
The ecosystem in Miyako Bay was greatly damaged during the tsunami generated by the "2011 Tohoku Earthquake off the Pacific coast". Topographical features of tidal flats and shallows were considerably changed, and large quantities of seagrass and seaweed disappeared. To provide basic background information for a future restoration of eelgrass (Zostera marina) in the bay, we undertook a study of current sediment conditions. Field measurements were carried out at the head of the bay in February and October, 2012. Sediments were collected at stations where Zostera marina had grown prior to the tsunami. Using entropy analysis, we grouped sediments according to particle-size distributions. The head of the bay was divided into three zones on the basis of suitability for Zostera marina. Taking into account the characteristics of each zone, we proposed future monitoring plans.
