Evaluation of Dredged Soil as a Silt and Clay Source for Artificial Tidal Flats
Artificial tidal flats were constructed in a tidal flat simulator using the mixtures of mountain sand and dredged soil at the ratio of 5％ and 25％ on silt content basis, and the sediment characteristics and emerged macrobenthos were surveyed. As the ratio of dredged soil increased, the number of emerged macrobenthos became higher with changes in the composition macrobenthos species. In addition, the macrobenthos in the artificial tidal flats was more abundant than that in the control tidal flat where the sediment collected from a natural tidal flat was used. At 25％ of silt content, a detritus feeder gastropoda Batillaria cumingii and polychaeta Capitella capitata tolerable to anaerobic condition were the dominant species, whereas bivalve was not found. Analyses of the surface of sediment suggested that the increase in algal biomass at the silt content resulted in the abundant biomass of the gastropoda, though the underground was under anaerobic condition (ORP < -200 mV). At less silt contents, 5％ and 10％, surprisingly bivalves Ruditapes philippinarum and Musculista senhousia were more abundant than that in the control tidal flat. These results confirmed the feasibility of using dredge soil as an additive to improve the ecosystems in artificial tidal flat.
artificial tidal flat benthic ecosystem dredged soil silt & clay source
Satoshi NAKAI Ryo ISHII Wataru NISHIJIMA Mitsumasa OKADA
Department of Chemical Engineering, Hiroshima University, Hiroshima 739-8527, Japan Sanyo Techno Marine Inc., Tokyo 103-0012, Japan Environmental Research Center, Hiroshima University, Hiroshima 739-8513, Japan
国际会议
第八届中日水环境暨NSFC-JST重大国际合作项目成果交流会
苏州
英文
12-18
2008-11-29（万方平台首次上网日期，不代表论文的发表时间）