安定同位体比を用いた大阪湾及び周辺海域における水塊特性の解析(Water Mass Analysis of Coastal Sea Waters in and around Osaka Bay using Stable Isotope Ratio)
- 標題
- 安定同位体比を用いた大阪湾及び周辺海域における水塊特性の解析(Water Mass Analysis of Coastal Sea Waters in and around Osaka Bay using Stable Isotope Ratio)
- 作者
- 西田 修三, 佐藤 健太, 中谷 祐介(Shuzo NISHIDA, Kenta SATO, Yusuke NAKATANI)
- 文件屬性
- 日本研究
- 知識分類
- 基礎研究
- 出版年
- 2011
- 刊名
- 土木学会論文集B2(海岸工学)
- 卷
- 67
- 期
- 2
- 點閱數
- 2591
摘要
In Osaka Bay, water pollution phenomena such as red tide and blue tide still occur frequently, in spite of the efforts to improve water qualities for years. To make a decision about effective environmental measures in the bay, it is necessary to clarify the budget and cycle of nutrients in the waters. In this study, focusing on the water mass intruding from the outer ocean, a cluster analysis using salinity, nutrient concentrations, and stable isotope ratio δ18O and δD is conducted. The cluster analysis divides the coastal sea waters in and around Osaka Bay into six groups, including the clusters related to Kuroshio surface water and sub-surface ocean water, and the results show that the sub-surface ocean water had intruded into the Kii Channel due to off-shore migration of the Kuroshio Current in spring 2009.