CHANGES IN PROPERTIES OF TIDAL FLAT CONSTRUCTED WITH DREDGED MUD OVER TIME OR EXPOSURE

Abstract

 Because it is assumed that the dredged mud, which is material for tidal flat construction, will not diffuse into seawater, the organic properties of dredged mud have not been studied. In this study, dredged mud was collected in columnar form from two tidal flats with different elapsed times of dredged mud input, and the organic properties of each dredged mud were analyzed. There was no significant difference in apparent concentration of nutrients at the two sampling points years and decades after sand was covered on top of the dredge mud. However, the roles of dredged mud were confirmed from there was a significant difference in the content of nutrients bound to mud particles at the two sampling points, and active leaching of nutrients from dredged mud exposed to the water surface.