対馬海域における海洋温度差発電設計のための海洋調査(Oceanographic investigation for designing of an Ocean thermal energy conversion in the vicinity of the Tsushima Island)
- 標題
- 対馬海域における海洋温度差発電設計のための海洋調査(Oceanographic investigation for designing of an Ocean thermal energy conversion in the vicinity of the Tsushima Island)
- 作者
- 一瀬 純弥, 中岡 勉, 西田 哲也, 植田 貴宏, 中島 大輔, 秦 一浩, 水谷 壮太郎, 島崎 渉, 和嶋 隆昌, 浦田 和也, 池上 康之(Junya ICHINOSE, Tsutomu NAKAOKA, Tetsuya NISHIDA, Takahiro UEDA, Daisuke NAKASHIMA, Kazuhiro HATA, Sortaro MIZUTANI, Wataru SHIMAZAKI, Takaaki WAJIMA, Kazuya URATA, Yasuyuki IKEGAMI)
- 文件屬性
- 日本研究
- 知識分類
- 能源利用
- 出版年
- 2007
- 刊名
- 海洋深層水研究
- 卷
- 8
- 期
- 1
- 頁
- P 7-21
- 點閱數
- 2619
摘要
On the Tsushima Island, a practical application of an ocean thermal energy conversion (OTEC) and desalination plant is expected due to the short of electric power and drinking water. In the present study, we made oceanographic observation in the area northwest of Tsushima Island on August, October and November in 2005 and July, August and October in 2006 to obtain physical and chemical data (water temperature, salinity, dissolved oxygen, nutrients and velocity of currents) and topographic data, which is necessary for designing the hybrid OTEC system.
Approximate temperatures in the surface and deep seawaters (SSW and DSW, respectively) at about 170 m in depth were 28°C and 5 °C in August 2005, and 21°C and 8 °C in November. From the thermal data, OTEC was supposed to be active from August to October. The salinity in SSW and DSW were 31.0-31.8 31.8 PSU and below 34.2 PSU, respectively in August 2005; between depths of 30 and 50 m a drastic halocline was detected. The low salinity of SSW in summer suggests the influence of continental river waters. Dissolved oxygen in SSW and DSW in August 2005 were comparatively high (> 5.0 ml/1). Water quality showed drastic seasonal changes in SSW shallower than a depth of ca. 150 m, which may be the influence of continental river waters. On the contrary, DSW characterized by high salinity and low temperature was thought to be the cold water endemic to Sea of Japan. On an expected cold water pipe (CWP) (180-200 m in length, 1.7 m in diameter) designed for a seabased 1, 000 kW OTEC plant, the maximum bending moment was estimated to be larger than 3, 922 Nm. In the case of employing a land based OTEC plant at Cape Sao on the north of Tsushima Island, length of the CWP should be longer than ca. 9.5 km.
Approximate temperatures in the surface and deep seawaters (SSW and DSW, respectively) at about 170 m in depth were 28°C and 5 °C in August 2005, and 21°C and 8 °C in November. From the thermal data, OTEC was supposed to be active from August to October. The salinity in SSW and DSW were 31.0-31.8 31.8 PSU and below 34.2 PSU, respectively in August 2005; between depths of 30 and 50 m a drastic halocline was detected. The low salinity of SSW in summer suggests the influence of continental river waters. Dissolved oxygen in SSW and DSW in August 2005 were comparatively high (> 5.0 ml/1). Water quality showed drastic seasonal changes in SSW shallower than a depth of ca. 150 m, which may be the influence of continental river waters. On the contrary, DSW characterized by high salinity and low temperature was thought to be the cold water endemic to Sea of Japan. On an expected cold water pipe (CWP) (180-200 m in length, 1.7 m in diameter) designed for a seabased 1, 000 kW OTEC plant, the maximum bending moment was estimated to be larger than 3, 922 Nm. In the case of employing a land based OTEC plant at Cape Sao on the north of Tsushima Island, length of the CWP should be longer than ca. 9.5 km.