共查询到19条相似文献,搜索用时 140 毫秒
1.
利用对浙江中部三门湾海域为期1年的实测波浪资料,统计分析了该海域台风浪过程的波参数变化以及谱变化特性,探讨了台风浪对码头系泊船舶的影响。研究表明:三门湾海域常浪向和强浪向均为东面方向,谱峰周期大于10 s的波浪占全年波浪统计的21.48%。台风期间,外海涌浪和该海域风区内的风浪形成混合浪,波浪谱以双峰为主,其中0.08 Hz左右的东向涌浪成分占比很大,高频部分为不定向风浪;台风期间波浪谱峰周期与系泊船舶的固有横摇周期接近,另外,东向涌浪和码头系泊船舶形成一个45°的锐角,对船舶首摇不利,两者造成了海湾内系泊船舶的剧烈运动。研究成果可为海洋工程结构物的设计以及防灾减灾提供参考依据。 相似文献
2.
3.
4.
5.
6.
针对在西非海域作业的某多点系泊30万吨FPSO,研究西非海域特定环境条件下的双向风浪及涌浪的联合作用对该FPSO运动及载荷响应的影响。文中基于三维势流理论对FPSO运动响应进行数值分析,并与试验值幅值响应算子(RAO)对比。利用双Ochi-Hubble谱的短期预报,论述FPSO在双方向风浪及涌浪作用下的运动幅值、加速度及载荷响应;论述涌浪方向对运动及载荷响应的影响,并考虑涌浪周期敏感性的影响,对FPSO运动加速度、幅值、波浪弯矩、波浪剪力进行数值分析;总结了FPSO在双方向风浪及涌浪作用下运动及载荷响应根据浪向的变化特点,以及FPSO波浪载荷受风浪和涌浪周期敏感性影响的特点,为西非FPSO后续的结构设计提供参考。 相似文献
7.
选用内域藤田外域高桥的混合风场模拟台风风场,应用第三代海浪数值模式SWAN对2013年影响南海海域的超级台风"海燕"进行台风浪的推算。通过对测点处风速以及推算出有效波高与实测数据对比,分析发现模式计算结果与实测吻合良好。同时将其应用到南海海域波浪场的推算,能够很好地刻画台风经过时波浪场在时间和空间的变化,可为以后风浪的预报提供参考。 相似文献
8.
针对低频波浪诱发港池振荡问题,通过物理模型试验研究了双峰谱中低频谱峰(fp1)和低频谱有效波高(Hs1)的变化对诱发细长港池低频振荡的影响。结果表明:1) fp1越接近港池第1共振频率,港内低频波浪响应越剧烈,通过fp1放大因子曲线可以准确识别港池的第1共振频率;同时Hs1的变化主要影响第1共振模态的波浪响应。2)基于平方小波二阶相关谱对港内波浪的非线性分析发现,fp1越接近港池第1共振频率或Hs1逐渐增大,港内波浪非线性相互作用均会明显增强。该研究结果对于涌浪和风浪长期共存的海域港口建设起到良好的指导作用。 相似文献
9.
10.
11.
12.
大连长兴岛北港区波浪条件数值模拟研究 总被引:1,自引:3,他引:1
利用国际通用的MM5风场模式和SWAN浪场模式,通过推算影响工程海域的台风和寒潮大风天气过程,得到工程海域-30 m等深线处不同重现期设计波要素,然后采用MIKE 21 NSW和BW波浪数学模型,对工程规划方案设计波要素和港内波况进行了计算。结果表明:工程受N向和NNE向风浪影响相对较大,外海波浪传播至防波堤处无明显衰减;设计高水位重现期50 a时防波堤处最大H1%约7.3 m;防波堤对港内围堰掩护较好,建成后港内波浪条件明显改善。 相似文献
13.
14.
15.
16.
航海安全水池三维造波机造波特性与实际波浪模拟应用 总被引:2,自引:1,他引:1
对船研所风、浪、流水池造波机的皮特性结合具体工程试验提供一些基本测试参数和使用范围,以波谱形式给出二维不规则波模拟结果,便于今后使用时进行参考。 相似文献
17.
18.
《Marine Structures》2003,16(3):201-218
Data from four studies of waves generated by hurricanes are reviewed and compared. The combined dataset presents a consistent picture of the wave field within a hurricane. The wave field is more asymmetric than the corresponding wind field, mainly due to the “extended fetch” which exists to the right of a translating hurricane. This concept leads to the specification of an equivalent fetch for a hurricane which enables the use of fetch limited growth relations for the prediction of the significant wave height within a hurricane. Examination of spectra recorded within hurricanes indicates that they are remarkably similar to fetch limited forms. Relationships for the parameters defining fetch limited spectra are found to also be valid for hurricane conditions. The reason for the similarity of hurricane and fetch limited spectra is attributed to the shape stabilizing effect of non-linear wave–wave interactions, which continually reshape the spectrum to conform to the standard JONSWAP-like form. Although the wind speeds within hurricanes are very high, the spectra generated are mature, with values of non-dimensional peak frequency typical of fully-developed seas. The analysis develops a set of standard relationships which can be used to define the wave field and spectral form for use in design of offshore fixed and floating structures. 相似文献
19.
《Marine Structures》2000,13(4-5):245-260
This paper presents the results of investigation of wind lift force on VLFS of semisubmersible type. In the present study, wind–wave tank experiments on the scale model were also conducted in regular progressive waves. Lift forces and wind pressure were measured as a function of column diameter, unit number, superstructure and wave condition, and divided into time-averaged mean and fluctuating components. The importance of lift force, especially at the leading edge of deck, was verified in the experimental results. The results showed that fluctuation in lift force which was caused by interaction between the wind and wave was significantly large in typhoon conditions. Measured lift forces were linearly related to fluctuation of wind velocity. A lift force model is further proposed for the estimation of lift forces on VLFS of semisubmersible type and the effectiveness of this model was confirmed by the present experimental data. 相似文献