应用SWAN模型分析航道对波浪传播的影响  

Analysis of the influence of channels on the wave propagation with SWAN model

作　　者：赵海涛[1] 张亦飞[1] 郝春玲[1] 徐伟[1] 

机构地区：[1]国家海洋局第二海洋研究所,杭州国海海洋工程勘测设计研究院,浙江杭州310012

出　　处：《海洋学研究》2008年第3期44-52,共9页Journal of Marine Sciences

摘　　要：应用SWAN模型,采用多向不规则波计算了秦皇岛港航道改造工程前后4个具有代表性波向的波浪场,分析了航道对工程区4个不同方向波浪传播的影响并得到了航道沿程的波高分布。改造后的秦皇岛港航道呈折线型,长为24.4 km,相应的计算区域较大,使Boussinesq模型因网格过多而难以进行计算,而缓坡方程模型在处理多向不规则波时计算过于繁琐,SWAN模型在大区域、多向不规则波情况下能够较好地解决计算问题。运用该模型计算的结果表明,秦皇岛港航道改造工程后距航道较近区域的波态发生明显的变化,但工程海区的波浪整体传播规律没有发生大的改变。The SWAN model was introduced briefly, including action balance equation, source term, boundary conditions and solution technique. The wave fields of four representative directions of the project area were computed with SWAN model before and after the rebuilding of channel in Qinhuangdao Harbor,and the wave parameters of the Qinhuangdao ocean station were used as boundary conditions. In the project area,the influence of channel on the wave of different directions was analyzed, and the distribution of wave height along the channel was also given. After rebuilding the length of the channel will be 24.4 km and the computational area will be very large accordingly, which leads to the failure for the Bousssinesq wave model to compute because of the too large meshes. And it ＇s too complex to deal with multidirectional irregular wave with the Mild-Scope wave model. But SWAN model can overcome these shortcomings and shows it ＇s superiority in dealing with large computational area and multidirectional irregular wave condition. According to the terrain and the direction of the channel,four wave directions of ESE,SE,SSE and S are selected. The JONSWAP spectrum and the directional distribution function as A cos^2n （θ） were used in wave generation. Recurrence interval was once in 5 years. The water level was the high design water level. And stationary model was used. The computational region is 35 000 m× 24 600 m. The spatial resolution △x and △y are both 40m. The the area creased i results show that： （1）The main change of wave field resulted from channel rebuilding near the channel, where the wave height increased in the channel side facing incoming n the other side. But the area with obvious ware height change was only in the narrow project was in wave, and dearea on either sides of the channel,and the overall wave field of the project area is not changed,which is different to the re suit from the calculation of one dimensional wave. （2）The channel＇s influence on wave transmission is closely

关 键 词：SWAN模型 航道 多向不规则波 

分 类 号：U661.1[交通运输工程—船舶及航道工程]