Numerical Experiment of Sea-water Exchange around Huge Floating Offshore Structure

大型海上漂浮结构周围海水交换数值试验

• 批准号: 07455400
• 负责人: FUJINO Masataka
• 金额: $ 4.29万
• 依托单位: University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07455400/
• 关键词: Sea Water exchange; Huge Floating Offshore Structures; Numerical simulation; Sea covering effects; Water particles tracking

In order to estimate environmental effects of huge floating offshore structures (HFOS) on the surroundig sea water, numerical simulation program was developed. And then, numerical experiments were carried out assuming that an imaginary HFOS of 6km in length and 2km in width was moored in the center of a simplified model bay, i.e.a rectanglar bay of 40kmx20km. Expected environmental effects of HFOS are caused by interrupting the intrusion of solar ray, evaporation and precipitation on the sea surface, and by preventing appearance of wind stress, and so on.The main results of numerical experiments are as follow :(1) Sea water movement induced by ununiformed distribution of water temperature around HFOS is of unnegligible order. Hence, from the viewpoint of enhancing sea water exchange around HFOS,it can be said that HFOS may produce affirmative effects.(2)This sea water movement is brought about not only in the outermost layr in a bay but also in the bottom layr(3) This sea water movement is not restricted in the close vicinity of HFOS,but may spread far from HFOS.(4) According to the results of tracking a number of sea water particles under HFOS,it is found that sea water tends to spread further in summer than in winter.

为了评估大型海上浮式结构物对周围海水的环境影响，开发了数值模拟程序。然后，将一艘长6km、宽2km的假想HFOS停泊在简化模型海湾中心，即40km × 20km的矩形海湾，进行数值实验。高氟辛烷磺酸的预期环境效应主要表现在阻断太阳射线的侵入、海面的蒸发和降水、防止风应力的出现等方面。数值实验的主要结果如下：(1)HFOS周围水温分布不均匀引起的海水运动具有不可忽略的阶数。因此，从增强HFOS周围海水交换的角度来看，HFOS可能会产生积极的作用。(2)这种海水运动不仅发生在海湾的最外层，也发生在底层。(3)这种海水运动不仅局限于HFOS附近，而且可能向远离HFOS的地方扩散。(4)根据对高氟辛烷磺酸作用下海水颗粒数量的跟踪结果，发现夏季海水扩散的幅度大于冬季。

项目成果

藤野 正隆: "超大型浮体まわりの水塊の挙動に及ぼす海面遮蔽の影響に関する数値シミュレーション" TECHNO-OCEAN'96. PROCEEDINGS II. 691-696 (1996)

Masataka Fujino：“海面屏蔽对超大型浮体周围水团行为影响的数值模拟”TECHNO-OCEAN96 (1996)。

Shigeru TABETA: "Comparison between Simulation Results and Field Data about Currents and Density in Tokyo Bay" Journal of Marine Science and Technology. Vol.1,No.2. 94-104 (1996)

Shigeru TABETA：“东京湾海流和密度的模拟结果与现场数据的比较”海洋科学与技术杂志。

藤野 正隆 他: "超大型浮体周辺の海水に対する海面遮断の影響につて" 日本造船学会論文集. 第180号. 393-402 (1996)

Masataka Fujino 等人：“海面拦截对超大型浮体周围海水的影响”日本造船学会会刊第 180. 393-402 号（1996 年）。

Inoue, Y., Zhang, X.and Tabeta, S.: "Numerical study of the Hydrodynamic forces on huge floating structure in waters and ocean currents" Proc.International Offsore and Polar Engneering Conference. 221-228 (1997)

Inoue, Y.、Zhang, X.和Tabeta, S.：“水域和洋流中巨型漂浮结构的水动力数值研究”Proc.国际海上和极地工程会议。

Fujino, M.and Hamada, T.: "Numerical simulation of sea-covering effects of a huge floating structure on the sea water surrounding the structure" Proc.TECHNO-OCEAN'96. Vol.II. 691-696 (1996)

Fujino, M. 和 Hamada, T.：“大型漂浮结构对结构周围海水的海洋覆盖效应的数值模拟”Proc.TECHNO-OCEAN96。