Acoustic equipment and ROV investigations of mercury diffusion in Minamata Bay, Yatsushiro Sea, Japan

摘要：

　　The purposes of this study are to understand mercury accumulation and diffusion based on topographic,sedimentologie,and biologic information obtained by acoustic equipment and an ROV after dredging in Minamata Bay and Yatsushiro Sea.Differences in contrast of acoustic reflections made clear the sediment distribution and the ROV investigation provided the vertical distribution of the biota and substrate.Rocks and blocks are distributed above 5 m water depth,coarse sand with rich molluscan fragments between 5 and 12m,and mud below 12m,with these sediments controlling the biota.The video shows that many depressions by rays predation are distributed on sandy bottoms and burrows of benthic organisms on muddy bottoms.These facts suggest the possibility that a supply of mercury-free sediment moves from the sub-surface to the surface by burrowing,that mercury is concentrated by the benthos inhabiting the sediment surface,and that diffusion occurs by the predation of nekton.

关键词： Acoustic equipment ROV mercury diffusion Minamata Bay

作者: Kazumi Akimoto Kiyoshi Takikawa Koichi Yakita Takaomi Hokamura Yukihide Shimasaki Keisuke Mori Izumi Sakamoto Yoshiyuki Takino

作者单位: Kumamoto University, 2-39-1 Kurokamai, Chuo-ku, Kumamoto 860-8555 Japan National Institute for Minamata Disease, 4058-18 Hama, Minamata City, Kumamoto 867-0008 Japan Tokai University, 3-20-L Orido, Shimizu-ku, Shimizu-shi Shizuoka 424-8610 Japan

会议类型: 国际会议

会议名称: 2013 International Symposium on Environmental Science and Technology(2013环境科学与技术国际会议)

会议地点: 大连

会议语种:英文

页码: 136-142

在线出版日期: 2013-06-04（万方平台首次上网日期，不代表论文的发表时间）