成果報告書詳細
管理番号20140000000041
タイトル*平成24年度中間年報 風力等自然エネルギー技術研究開発 洋上風力発電等技術研究開発 洋上風況観測システム実証研究(銚子沖)
公開日2014/7/15
報告書年度2012 - 2012
委託先名東京電力株式会社 国立大学法人東京大学
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Title : Demonstrative Research 0n Offshore Wind Measurement System (Choshi) (FY2009-2014) FY2012 Annual Report

1) Measurement of meteorological and oceanographic quantity:

The wind measurement instruments such as anemometers, anemoscopes, the Doppler Lidar and so on were installed on the observation tower and the on-site observation was started. The operation of data collection and distribution system was also started. The maintenance of the instruments was carried put.
The on-site observation of waves and currents has been continued from January 2010. Observed wave data showed the characteristics of wind waves and swells on the site, which are typical patterns of temporal changes of wave height and period.

2) The verification and the Improvement of numerical simulations :

i) Prediction of wind speed under normal condition :
Meteorological simulations at offshore Iwaki are carried out for year 2004 to verify the predictability of strong wind events and to investigate the effect of atmospheric stratification on offshore wind climate. Strong wind induced by low pressure in winter can be better predicted by mesoscale model WRF than conventional model RAMS. In winter, unstable atmospheric conditions are dominant and wind speed difference between upper and lower atmosphere is small. On the other hand, stale atmospheric condition during summer season leads to large difference in wind speed between upper and lower layers.

ii) Prediction of wind speed during typhoon :
Prediction methods for strong wind during typhoon were investigated by using the measurement data at Choshi and Miyako meteorological stations for 10 years from 2000. Mesoscale simulation with typhoon bogusing data showed larger wind speed the prediction accuracy compared to conventional mesoscale simulation. On the other hand, wind speeds estimated by Typhoon model showed good agreement with measurement, showing that typhoon model is the effective method for the estimation of the design wind speeds.

iii) Prediction of wave in normal condition :
Effect of special resolution of bathymetry on wave simulation is investigated by using the measurement data obtained in this project. A bathymetry grid resolution of 500m is enough to predict accurate wave height in July, when Southerly wind is dominant. However, in January, when Northerly wind is dominant, use of same resolution resulted in overestimation of significant wave height. This is due to the fact that 2km resolution wind field is not sufficient to resolve the effect of onshore terrain.

iv) Prediction of wave during typhoon :
Wave simulations are carried out at offshore Kashima for typhoon periods from 1996 to 2007 by using three different boundary conditions for wind filed, i.e., wind field generated from Messoscale model, typhoon model and the combination of them. Use of typhoon model wind filed underestimates the wave height because swell is not considered. On the other hand, use of combined wind field from Messocale model and typhoon model successfully estimated the effect of swell.

3) Design and construction of the observation tower:

The construction of the foundation of the observation tower was completed at the Port of Higashi-Harima. The foundation was towed to the site and deployed. The filter units for anti-scouring were also deployed.
Parts of the observation tower was organized to several blocks at Sodegaura city, then the blocks were installed on the foundation using self-elevating platforms (SEP) and a crane.

4) Detailed research of the impact on environment :

Detailed research of the impact on environment has been carried focusing on the effect on the wildlife, marine life, fishery radio and seascape. In 2012, the current environmental condition after the structure was set up has been researched. The resarch data has been analyzed, in 2013.
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