利用数学模型进行港内长周期波浪风险分析

针对港内长周期波风险问题,使用MIKE 21 BW模型建立了港内波浪传播数学模型。模型的构建使用了白噪谱和天然波况作为入射波浪条件。基于白噪谱的模拟结果,使用数字滤波技术分析了港池固有共振周期,并给出了相应共振周期下的水面高程和能量密度分布;基于天然波况的模拟结果,提取了泊位处的波高时间序列,以30 s为界限,分离出了长周期波。以西非某港为例,探讨了港池的长波风险,模拟结果可作为港池布局的参考依据。

Risk analysis of long-period wave in harbor basin by using numerical model

MIKE 21 BW model is used for analysis of the risk of long period wave inside the harbor basin.The model building uses white noise spectrum and natural wave as incipient wave.Based on the white noise simulation result,harbor resonance periods are calculated using digital filter technology.Based on the natural wave simulation result,the wave time series at the berth is extracted.And the long period wave is filtered using threshold of 30 seconds.Taking a harbor at west Africa as an example,the long wave risk of harbor basin is discussed,and the result can be treated as reference for harbor layout design.