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Abstract

Although clean sand has been generally used for the construction of tidal flats, it becomes difficult to obtain the sea sand and land sand in recent years. Also, the sea sand and the land sand are not suited to the marine spicies of tidal flats, because there are little content of organic matter and silt and clay. We are proposing the tidal flat construction method by using dredging organic sediment. There are the following subjects in the design of this construction method: (1) The design method that requests the optimal mixture rate of dredging sediment and sand is established.(2) The method that secures the optimal mixture rate of dredging sludge and produces effectively is established. We have constructed the tidal flats by two types of the methods which consist of seaside approach and landside approach. We established the design and construction method of mixing the dredging organic sediment and demonstrated in the construction works.