基于实测数据的南海阵风因子参数研究

Study on Parameters of Gust in the South China Sea Based on Measured Data

南海台风期间,风荷载也是作用在海上结构物上的主要荷载之一,有时甚至起着决定性作用。风湍流特性参数计算的准确与否,对于这些大型构筑物风荷载计算的精度至关重要。通过使用南海某平台上长期风要素观测资料,对南海阵风因子等参数进行了研究。由实测资料分析结果可知:当台风过程中的风速最大时,其阵风与平均风速的差值较大;当风速较小时,这种差异不太显著;实测资料还表明,南海夏季风场变化较大,但强度不大;冬季风场强大而稳定,相应海况也更为恶劣。这种湍流脉动风的不稳定性说明了台风过程对阵风因子的研究具有重要的意义,其成果可为南海海洋油气工程建设和施工作业提供参考和技术保障。

Wind load is one of the main loads on offshore structures during typhoons in the South China Sea.By using the observed data of long-term wind on a platform in the South China Sea,parameters of gust are studied.It is shown that when the wind speed is great,the difference between gust and mean wind speed is larger,and when the wind speed is small,the difference is not very significant.The results can provide reference and technical guarantee for the construction of SCS offshore oil and gas engineering.