基于SWAN-MIKE21嵌套模型在大连湾某工程区的波浪后报模拟应用

Wave hindcast simulation based on SWAN-MIKE21 nested model in an engineering area in Dalian Bay

近海工程中,需分析波浪在工程区的传播特点。采用SWAN-MIKE21嵌套模型对某工程海域进行波浪后报模拟分析,同时进行波浪实测。模拟结果与实测平均绝对误差在0.2 m以内。SWAN-MIKE21嵌套模型兼顾了大尺度模型计算速度,小尺度地形网格划分及后处理。后报模拟结果表明,波浪主要影响因素为外海波浪和区域风场。外海波浪为S—SE向时,绕射后能影响工程区域,波向在E向附近。当区域风场为E—SE向时,区域风场会增大工程区波高。当区域风场为N—NW向时,会把波向变为ENE向。实测结果中,冬季盛行N—NW风时,工程区的强浪向为ENE向,其余季节强浪向为E向,与模拟的结论一致。

In coastal project,it is necessary to analyze the wave propagation characteristics in the engineering area.The SWAN-MIKE21 nested model was used for wave hindcast simulation and analysis in this area,and the wave measurement was carried out.The simulated wave results were consistent with measures with an average absolute error of less than 0.2 m.SWAN-MIKE21 nested model makes a balance between computation speed of large-scale model,and meshwork division and post-processing of small-scale terrain.The hindcast simulation results show that the waves condition in this area are dominated by the interaction of deep ocean waves and local wind field.When deep ocean waves are S—SE direction,it can propagate to engineering site by diffraction and diffusion with a final E direction.A strong local wind field with E—SE direction may increase wave height.Conversely,a strong local wind field with N—NW direction may change final wave direction to ENE.The measured results show that,in the winter with prevailing N—NW wind,strong wave direction in the site is ENE,however in the other season,strong wave direction is E direction,which is consistent with conclusion above.