WRF与CFD嵌套的局地台风风场数值模拟研究

发布时间：2018-03-12 22:15

本文选题：台风风场　切入点：中尺度WRF模式　出处：《哈尔滨工业大学》2015年硕士论文　论文类型：学位论文

【摘要】：在我国每年都会遭受数十个台风的袭击,由台风引起的暴雨、强风以及海浪潮等对我国东南沿海地区(特别是经济发达地区)造成严重威胁。为了提高预防台风灾害能力,减小台风造成的损失,需要获取近地面台风风场信息,为台风风险分析以及台风作用下建构筑物抗风设计等提供条件。由于台风路径的不确定性和测试仪器的限制,实测获得台风风场往往是不现实的。最新一代中尺度天气预报和数据同化系统Weather Research and Forecast(WRF)代表了当前中尺度模式领域最新的科研成果,它包括了目前最全面的大气物理过程和更为优化的动力框架,这使得WRF的应用前景将会更加广阔。本文采用WRF模式对历史上登陆我国东南沿海地区的三个台风案例做了数值模拟,并利用WRF模拟获得的数据为计算流体力学(CFD)模型提供初始条件,以实现两个不同尺度模式之间的嵌套运算,完成台风风场精细化降尺度模拟,获得考虑局部地形影响的台风风场。本文介绍了中尺度WRF模式及其台风模拟的数值计算方案;针对局地地形台风风场模拟,结合CFD模型,提出了WRF和CFD嵌套的数值计算方案。采用WRF模式中的三种边界层方案,即YSU方案、Mellor-Yamada-Janjic(MYJ)方案和MRF方案,和三种积云对流参数化方案,即Kain-Fritsch(KF)方案、Betts-Miller-Janjic(BMJ)方案和Grell-Devenyi(GD)方案的9种不同组合,对历史上三个台风案例:0812号台风“鹦鹉”、0814号台风“黑格比”和1003号台风“灿都”进行数值模拟,分析各种方案下WRF对台风路径、强度、台风近中心处最大风速、风向等的模拟效果。并建立了深圳市塘朗山地区的CFD模型,提取WRF模式对1003号台风“灿都”的高精度数值模拟结果,作为CFD模型的初始风场条件,实现WRF模式与CFD方法之间的数据传递,完成嵌套运算。对其模拟结果的分析表明,仅使用WRF模式不能精确模拟近地面台风风场特征,而将WRF模式与CFD嵌套运算,可以很好地模拟近地面台风风场特征,其结果对工程应用有重要价值。
[Abstract]:In our country every year from dozens of typhoons, caused by Typhoon Torrential rain, strong winds and tidal waves in the southeast coastal area of China (especially in economically developed areas) poses a serious threat. In order to improve the ability of prevention of typhoon disasters, reduce losses caused by the typhoon, the typhoon wind field near the ground to obtain information, to provide the conditions for typhoon risk analysis and building under typhoon wind design. Due to the typhoon path and the uncertainty of test equipment limitations, the measured wind field of typhoon is often not realistic. The latest generation of mesoscale weather forecasting and data assimilation system Weather Research and Forecast (WRF) represents the latest the research achievements in the field of the scale model, it includes the most comprehensive atmospheric physical processes and more dynamic optimization framework, which makes the application of WRF will be more broad. This paper adopts the Using the WRF model to the history of three cases of typhoon landing in the coastal areas in Southeast China do numerical simulation, and using WRF simulation data obtained for computational fluid dynamics (CFD) model with initial conditions, to achieve the two nested operation between different scale models, complete the typhoon wind field fine downscaling simulation, obtained considering the local topographic effects of typhoon wind field. This paper introduces the numerical simulation of typhoon mesoscale WRF model and its calculation scheme; according to the local topography of typhoon wind field simulation, combined with the CFD model, put forward the calculation method of numerical WRF and CFD nested case. Using WRF model in three kinds of boundary layer scheme, YSU scheme, Mellor-Yamada-Janjic (MYJ) scheme and MRF scheme, and three kinds of cumulus parameterization schemes, namely Kain-Fritsch (KF), Betts-Miller-Janjic (BMJ) and Grell-Devenyi (GD) 9 different combination schemes, on the history of the three A typhoon case: 0812 typhoon "parrot", the 0814 typhoon "Hagupit" and "1003 typhoon CHANTHU" numerical simulation, analysis of various schemes of WRF on the path of typhoon, typhoon intensity, near the center of maximum wind speed, wind direction and other simulation results. The CFD model is built Tanglangshan area of Shenzhen the extraction of WRF model of high precision numerical simulation results can "1003 typhoon", as the initial wind field of CFD model, WRF model and CFD method to realize the data transmission, to complete the operation. The analysis shows that the nested simulation results, only the accurate simulation of the near surface wind field of typhoon characteristics using WRF the operation mode is not, WRF model and nested CFD, can well simulate the near surface wind field of typhoon characteristics, the result has important value for engineering application.

【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU312.1

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