Wind Energy
Online ISSN : 1884-457X
Print ISSN : 0387-6217
ISSN-L : 0387-6217
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Volume 40, Issue 3
Displaying 1-31 of 31 articles from this issue
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  • Numerical Prediction of Normal and Extreme Sea Current at Fukushima Offshore Site
    [in Japanese], [in Japanese], [in Japanese]
    2016 Volume 40 Issue 3 Pages A_35-A_42
    Published: 2016
    Released on J-STAGE: April 08, 2018
    DOIhttps://doi.org/10.11333/jwea.40.3_A_35
    JOURNAL FREE ACCESS
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    Numerical predictions of sea currents are carried out for one year by using Princeton Ocean Model (POM) and validated by using measurement data at Fukushima floating offshore wind farm demonstration site. Predicted current speed and direction show good agreement with measurement. Then, a method for the prediction of the variation of annual average current speeds is proposed. In this method, the ratio of the annual mean current obtained from high resolution simulation and that from low resolution simulation are multiplied to the annual mean wind speed obtained from long-term low resolution data. Predicted variation of annual mean current speed show good agreement with that from high resolution simulation. Finally, prediction methods for the extreme current speed with recurrence period of 50 years are discussed. The extreme current speed based on corrected low resolution long-term data shows better agreement with that obtained from long-term high resolution data than those values estimated from high-resolution short-term data.
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  • Long-term wind analyses with microwave scatterometers for offshore wind resource assessment
    [in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
    2016 Volume 40 Issue 3 Pages A_43-A_48
    Published: 2016
    Released on J-STAGE: April 08, 2018
    DOIhttps://doi.org/10.11333/jwea.40.3_A_43
    JOURNAL FREE ACCESS
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    The purpose of this study is to clarify the variations of wind speeds estimated by SeaWinds and ASCAT from 2000 to 2014 around Japan and evaluate the representativeness of the last 5 and 3 years (2010-2014 and 2012-2014) for the 15 years. It is found that the 5 and 3 year average wind speeds and wind energy densities correspond with the 15 year average with an accuracy of less than ±5 % and ±15 % differences, respectively. Compared with standard deviations of wind speeds for the 15 years (SD15), approximately 70 % of the Japanese coastal waters, except areas in the northern part, are found to have wind speed deviations of less than SD15, being regarded as normal years. It is also found that the 3 year average wind speed has the representativeness for the 15 years in areas with a low interannual variability while the 5 year average wind speed has the representativeness even in areas with a high interannual variability. Moreover, as for wind direction, large differences cannot be found in the wind roses among the 3, 5 and 15 years.
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