ANALYSIS OF LONG-TERM TRENDS AND CHANGES OF OFFSHORE WIND AND WAVE RESOURCE IN CHINA
Offshore wind and wave energy are highly attractive renewable energy resources.In the context of climate change,ERA5 reanalysis product was utilized to investigate and compare the long-term historical trends and multiscale changes of offshore wind and wave resources in the China seas over the period of 1979～2020.The Mann-Kendall test and Theil-Sen estimator were employed to quantify the significance,magnitude,and discontinuity of the trend.Results show that there are significant disparities in characteristics and trends of offshore wind and wave energy.The trend in wind power is not statistically significant and the growth rate is 0.55％per decade.In contrast,the trend in wave power exhibits a robust upward increase at a positive rate of 4.8％per decade.General shifts in wave characteristics indicate a transition towards higher wave heights,longer periods,and increased energy.Distinct long-term trends were observed in different seasons and regions,with winter emerging as the predominant season for wind and wave resource reservoirs and trend growth;and open waters,such as the East China Sea,demonstrated the potential for sustained development of wind and wave energy.Building upon these analyses,the study further explored the spatio-temporal diversity of wind wave and swell energy,revealing that the reinforcement of wave fields and the differentiation between wind and wave energy fields are primarily contributed by swell power,and modulated by swell variations.These findings provide scientific insights for studies in various fields,such as resource assessment,climate forecasting of wind and wave patterns,and ocean engineering.
万方数据
维普
