A case study of combined wave and water levels under storm conditions using WAM and SWAN in a shallow water application
A case study of combined wave and water levels under storm conditions using WAM and SWAN in a shallow water application
复制标题
DOI：
10.1016/j.ocemod.2010.07.009
复制
发表时间：
2010
期刊：
影响因子：
3.2
通讯作者：
Jennifer M. Brown
中科院分区：
文献类型：
--
作者：
Jennifer M. Brown
英国利物浦湾的极端风暴事件正在调查中。最近的一场风暴（2007 年 1 月 18 日）已被用来研究不同的建模方法，以准确模拟浅水中的波涌条件。在利物浦湾，许多研究经常考虑波浪和浪涌的影响及其相互作用。使用 Proudman 海洋学实验室沿海海洋建模系统 (POLCOMS) 与最先进的第三代频谱波浪模型 (WAM) 相结合，对爱尔兰海的潮汐-涌流-波浪相互作用进行了建模。波浪是利物浦湾本地产生的，而浪涌是本地和外部产生的。为了包含外部浪涌，已使用单向方法将 1.8 公里爱尔兰海模型嵌套到 1/9° x 1/6° 运行大陆架浪涌模型中。为了研究 POLCOMS-WAM 在浅水中的性能，已将 180m 利物浦湾模型嵌套在爱尔兰海模型中。对于这个高分辨率模型，使用最先进的第三代近岸模拟波浪 (SWAN) 频谱模型来进一步开发针对浅水进行修改的 WAM。已经实施了 POLCOMS-WAM 和 POLCOMS-SWAN（单向）耦合模型来评估海岸潮汐-浪涌-波浪相互作用的影响。对有效波高和浪涌高程的调查表明，针对浅水区进行修改后，WAM 的性能与 SWAN 一样好。 POLCOMS-WAM 之间的双向耦合允许将波浪设置纳入浪涌预测中，从而大大改善水动力结果。使用 WAM 的一个缺点是计算费用较高，这使得 SWAN 更适合持续时间超过几天的模拟。
Extreme storm events in Liverpool Bay, UK, are under investigation. A recent storm, 18th January 2007, has been used to investigate different modelling approaches to accurately simulate wave–surge conditions in shallow water. In Liverpool Bay wave and surge influence and their interaction are often considered in many studies. The tide–surge–wave interaction has been modelled in the Irish Sea using the Proudman Oceanographic Laboratory Coastal Ocean Modelling System (POLCOMS) coupled to the state-of-the-art 3rd generation spectral WAve Model (WAM). Waves are locally generated in Liverpool Bay, while the surge is locally and externally generated. To include the external surge the 1.8km Irish Sea model has been nested, using a 1-way approach, into the 1/9° by 1/6° operational Continental Shelf surge model. To investigate the performance of POLCOMS–WAM in shallow water a 180m Liverpool Bay model has been nested within the Irish Sea model. For this high resolution model the state-of-the-art 3rd generation Simulating WAves Nearshore (SWAN) spectral model is used to further develop WAM, modified for shallow water. A POLCOMS–WAM and POLCOMS–SWAN (1-way) coupled model has been implemented to assess the effects of tide–surge–wave interaction at the coast. Investigation of the significant wave height and surge elevation reveals that when modified for shallow water WAM performs as well as SWAN. Two-way coupling between POLCOMS–WAM allows wave-setup to be included in the surge prediction greatly improving the hydrodynamic result. A drawback to using WAM is the computational expense, making SWAN more suitable for simulations exceeding a few days in duration.