Based on ERA-40 45 years wave reanalysis data from ECMWF (European Centre for Medium-Range Weather Forecasts), sea surface wind, significant wind wave height, significant swell height, frequency dependent on wave scales, wave direction frequency are respectively analyzed to learn their multi-year statistics related to Xisha and Nansha sea area. The statistics are focused on seasonal variations and stabilities of wind wave energy and swell energy. It is shown in the results that the sewll energy is more stable than the wind wave energy in the South China Sea. Xisha sea area is a region rich of wave energy with an annual average density about 8. 0 kW/m. Its wind wave energy density is about equivalent to the swell energy density. The annnal average wave energy density is about 4. 8 kW/m and the swell energy density is dominant in Nansha sea area.%采用来自ECMWF将风浪、涌浪分离的近45 a ERA-40海浪再分析资料,对西沙和南沙海域的海面风速、风浪有效波高、涌浪有效波高、浪级频率、波向频率的多年变化特征进行统计研究,重点讨论了西沙和南沙海域风浪能和涌浪能季节变化和稳定性特点.结果表明:南海海域涌浪能明显比风浪能稳定,西沙海域年均能流密度约8.0kW/m,风浪能流密度和涌浪能流密度大小相当,是南海波浪能的富集区;南沙海域年均能流密度约4.8kW/m涌浪,能流密度占据主导.
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