吉布提LNG厂址波浪极值推算

在吉布提LNG厂址的设计过程中,由于当地可用水文资料缺乏,现场观测活动起步晚、持续时间短(仅1 a),无法满足多年重现期设计波浪要素推算的需求,给后续工作带来了较大的困难。以CCMP风场数据作为驱动,基于波作用量平衡方程建立印度洋大范围波浪数学模型、嵌套的亚丁湾中等范围模型及工程区小范围模型,在现场实测资料的基础上,结合同期的Jason卫星轨道资料对模型进行验证对比,模型验证结果良好。在此基础上,计算了1988—2017年的逐时波浪要素过程,并据此构建出年极值波浪序列,利用P-III型分布函数推算工程区深水处的各重现期波浪极值,结合不同水文条件计算得出工程区的设计波浪要素。

Calculation of wave extreme value in Djibouti LNG plant site

In the design process of Djibouti LNG plant site,due to the lack of available hydrological data and the late start and short duration of field observation activities (only one year),it is unable to meet the demand of calculation of design wave elements in multi-year return period,which brings great difficulties to the follow-up work.Driven by the CCMP wind data,based on the wave action balance equation,a large-scale wave mathematical model of the Indian Ocean,a nested mid-range model of the Gulf of Aden and a small-scale model of the project area are established.On the basis of the field measurement data,the model is verified and compared with the Jason satellite orbit data in the same period,and the model verification results are good.On this basis,the hourly wave process from 1988 to 2017 is calculated,and the annual extreme wave sequence at deep water is constructed.The P-III type distribution function is applied to estimate the wave extreme values in the project deep area at different return period,which is combined with different hydraulic conditions to calculate the design wave parameters in the project area.