TRANSITION IN ENVIRONMENTAL CONDITIONS OF THE TIDAL FLAT THROUGH ITS IMPROVEMENT AND DEVELOPMENT

Abstract

Heiwajima Tidal Flat was improved and developed by means of moving former tidal flat in August at 2003. As it was concerned that the movement had severe damage to benthos in it, we took care of their environmental condition. So, we moved surface layer of the former tidal flat to its surface. Furthermore, we had ecological and soil survey on the tidal flat several times before and after its construction. In ecological survey, it was found that the number of benthos in it has been rising and recovered former tidal flat within 6 months. In soil survey, its soil formation was becoming similar to former tidal flat. As the result, this tidal flat was becoming similar to former tidal flat.