Ago Bay is a typical enclosed coastal sea that is connected to the Pacific Ocean via a very narrow and shallow entrance. The bay has been contaminated by the practice of culturing pearls, which has been occurring for the past 110 years. To address this problem, a new technology — the Hi-Biah-System (HBS) — was introduced in 2005. This product of this system, which dewaters muddy dredged sediments and reduces them to their raw materials, was used to construct a tidal flat. The purpose of this study was to evaluate the environmental conditions of the constructed tidal flat 2 years after it was built. We monitored the physico-chemical (oxidation–reduction potential, acid volatile sulphide, loss on ignition, water content, total organic carbon, total nitrogen, chlorophyll a, and particle size) and biological characteristics of five constructed tidal flats and a natural tidal flat. At the same tidal level, the physico-chemical parameters were similar among the five constructed tidal flats and the natural one. However, the biomass and macrobenthic population were higher in the constructed flat compared to the natural one. We suggest that the muddy dredged sediments generated by the HBS could provide useful materials for enhancing the productivity of the tidal coastal environment.
Imai, Daizo; Kaneco, Satoshi; Katsumata, Hideyuki; Ohta, Kiyohisa; Dabwan, Ahmed H. A.; Suzuki, Tohru; and Kato, Tadaya
"Construction Of Biologically Productive Artificial Tidal Flats With Solidified Sea Bottom Sediments,"
Proceedings of the Annual International Conference on Soils, Sediments, Water and Energy:
Vol. 13, Article 31.
Available at: http://scholarworks.umass.edu/soilsproceedings/vol13/iss1/31