渤海海浪SWAN计算模式及波浪反射的研究

发布时间：2018-04-06 05:37

本文选题：渤海海域　切入点：SWAN模式　出处：《天津大学》2014年硕士论文

【摘要】：随着社会的不断发展与进步，灾害性海浪这种不可忽视的自然灾害，，愈发得到人们的关注，其中灾害性近岸波浪与人们的接触最为直接与频繁。灾害性近岸波浪对于近海的海岸基础建设、工业生产作业、渔业养殖捕捞等相关行业有着深远的影响。我国海洋经济的健康发展与完善的保证机制密不可分，所以研究海浪的形成发展传播，进行海浪数值模拟，对波浪要素进行实时预报具有重要意义。本文运用最新版本的第三代近岸浅海海浪模式SWAN40.91（SimulatingWaves Nearshore），以高精度WRF（Weather Research And Forecast）风场和有限体积非结构网格FVCOM潮流作为驱动场，在结合二者的情况下，从计算模式、网格形式、耦合样式这几个角度，对渤海海浪数值预报模式的丰富与完善进行了研究。最后根据工程实际，模拟了曹妃甸附近海域的两处不同坡堤，在不同的反射条件下，海浪要素的变化情况。计算模式上利用大型工作站多线程的优势，对串行和并行两种计算模式进行了比较，并行计算可以有效地提高运算效率；网格形式上分别采用结构网格和非结构网格两种单元，非结构网格的模拟精度要高于结构网格；耦合样式上，在验证潮流模型的可行性后，考虑潮流场和不考虑潮流场，考虑表层流与平均流的情形，对比发现不论是表层流与平均流，在作为输入项加入模式时，结果没有明显的变化。为给予波能转换装置在不同环境下的构型选择一定的理论参考，文中在综合考虑波浪运动形态和波浪作用范围的基础上，分别针对海堤和岸堤两处水工建筑物，进行了海浪数值模拟。在不同反射条件的影响下，通过选取几个水工建筑物附近的特征检验点，对有效波高和平均周期的变化进行了论述。
[Abstract]:With the development and progress of the society, the disaster wave, which can not be ignored, has been paid more and more attention, among which the disaster near shore wave contact with people is the most direct and frequent.Disaster inshore waves have a profound impact on coastal infrastructure, industrial production, fisheries, aquaculture and fishing.The healthy development of marine economy in our country is closely related to the perfect guarantee mechanism, so it is of great significance to study the formation, development and propagation of ocean waves, to carry out numerical simulation of waves and to forecast wave elements in real time.In this paper, using the latest version of the third generation near shore wave model SWAN40.91(SimulatingWaves near shorehore, the wind field of high precision WRF(Weather Research And forecasting and the finite volume unstructured grid FVCOM power flow are used as the driving fields. Under the combination of the two models, the computational model and the grid form are used.In this paper, the rich and perfect models of wave numerical prediction in Bohai Sea are studied.Finally, according to the engineering practice, two different slope levees near Caofeidian are simulated. Under different reflection conditions, the variation of wave elements is simulated.Based on the advantage of multithreading of large workstation, the parallel computing mode is compared with serial computing mode and parallel computing mode. Parallel computing can effectively improve the efficiency of computing, and in the form of grid, structural grid and unstructured grid are used respectively.The simulation accuracy of the unstructured grid is higher than that of the structural grid, and in the coupling mode, after verifying the feasibility of the power flow model, considering the power flow field and the flow field, the surface flow and the average flow are considered.It is found that there is no obvious change in the results when the input term is added to the model, regardless of the surface flow and the average flow.In order to give a certain theoretical reference to the configuration of wave energy conversion device in different environments, on the basis of synthetically considering the wave motion form and wave action range, the paper aims at two hydraulic structures, seawall and shore embankment, respectively.The wave numerical simulation is carried out.Under the influence of different reflection conditions, the variation of effective wave height and mean period is discussed by selecting several characteristic test points near hydraulic structures.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P731.2

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