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成果報告書詳細
管理番号20170000000100
タイトル*平成27年度中間年報 海洋エネルギー技術研究開発 海洋エネルギー発電技術共通基盤研究 性能評価手法及びポテンシャルの調査
公開日2017/4/27
報告書年度2015 - 2015
委託先名みずほ情報総研株式会社 国立大学法人九州大学 国立大学法人鹿児島大学
プロジェクト番号P07015
部署名新エネルギー部
和文要約
英文要約In this study, we conducted research on performance assessment methods for marine energy converters (Task 1) and research in which we provided a detailed assessment of regional marine energy potential (Task 2).

The work we conducted in Task 1 in FY2015 involved researching the international standardization of marine energy converters, and this was summarized in the IEC/TC114 Strategic Business Plan. In addition, we created outlines of “Electricity producing wave energy converters - Power performance assessment” and “Electricity producing tidal energy converters - Power performance assessment”, summarizing performance assessment procedure while receiving advice from experts on sentences that were unclear and difficult to understand. We also summarized the latest information about domestic safety guidelines for marine energy converters and the status of certification schemes established by the IEC Conformity Assessment Board (CAB).

In Task 2, we selected potential areas for on-site testing or for commercialization of marine energy converters, and conducted research on detailed assessment of wave, tidal, ocean current and thermal energy resources.
When examining wave energy resources, we simulated the resources of the waters off Choshi (Chiba) using wave prediction models, and assessed the wave power, comparing the result with the observation data. We also studied how to enhance the simulation accuracy by using a local meteorological model and direction spectrum for the waters surrounding the Ishigaki-jima Island (Okinawa). The simulation demonstrates energy potential of over 10 kW/m near the coast off Choshi (Chiba).
For tidal energy resources, we conducted a detailed model calculation for the Goto Islands, the Seas of Ariake and Yatsushirokai, the Kanmon Straits, and the Inland Sea of Japan by using tidal data observed in the waters off Goto (Nagasaki) and Nagashima Channel (Kagoshima) and assessed the resources while considering the minute land features and sea depth. As a result, we were able to perform a detailed estimate of the potential off the west coast of Japan.
When looking at ocean current energy resources, we observed the ocean current in the Tokara Channel (Kagoshima) and the waters off Cape Shiono-misaki (Wakayama), established a high-resolution numerical model and assessed the potential based on the observation data. The average potential in the ordinary period (non-large-meander period) are > 0.5 kW/m2 off the Tokara Channel, > 0.25 kW/m2 off the Osumi Channel, > 2.0 kW/m2 off the Cape Ashizuri-misaki, and > 1.7 kW/m2 off the Cape Shiono-misaki. In the large-meander period, the average potential changes a little (1.5 kW/m2) off the Cape Ashizuri-misaki but it drops significantly (< 0.1k W/m2) off the Cape Shiono-misaki.
For ocean thermal energy resources, we observed diurnal variation of sea temperature and salinity in the waters surrounding the Kume-jima Island (Okinawa), revealing a predominant short-term variation. We also established a high-resolution numerical model to assess the resources while considering the observation data and long-term re-analysis results. It shows that the average potential in the Kume-jima Island demonstration field reaches about 27 W/m2 if the seawater renewal rate in the Okinawa Trough is taken into consideration.
Based on the research, we made maps showing the potential resources of wave, tidal, ocean current and thermal energy.
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