基于经验参数模型的台风数值模拟及其基本设计风速推算

发布时间：2018-03-23 11:50

本文选题：基本风速　切入点：经验参数模型　出处：《西南交通大学》2017年硕士论文

【摘要】：台风灾害是我国东南沿海城市主要的自然灾害之一,它发生频率高,破坏力强。因此在对我国东南沿海地区进行建筑结构设计时,风荷载是主要的控制荷载,其取值主要取决于当地的基本设计风速大小,而基本设计风速的取值依赖于长期准确的台风观测资料。由于现存的历史台风观测数据质量不高,因此基于一定的风场模型采用数值模拟的方法模拟台风路径和风场进而推算基本设计风速成为主要方法。风场计算模型主要分为动力学模型和经验参数模型,国内对经验参数模型研究较少,本文主要研究了风场经验参数模型中包括粗糙度调整参数,径向调整参数,风场不对称调整参数,梯度高度调整参数等参数的具体取值方法,确定了适于我国东南沿海地区的台风风场计算参数模型。并基于该风场模型对厦门地区进行基本风速推算。在进行计算点的台风基本设计风速推算时,通过作模拟圆的方法选取对计算点影响较大的历史台风关键参数作为样本,分析了台风关键参数中的台风年发生率、台风中心移动速度、最大风速半径、台风移动方位角和台风中心气压差等参数的最优概率分布模型。采用蒙特卡罗模拟随机模拟了该模拟圆内100年的台风,基于参数模型计算了极值风速序列,进而采用极值分布推算了厦门市不同重现期下的设计风速。
[Abstract]:Typhoon disaster is one of the main natural disasters in the southeast coastal cities of China, which has high frequency and strong destructive power. Therefore, wind load is the main control load in the structural design of the southeast coastal areas of China. Its value mainly depends on the local basic design wind speed, and the value of basic design wind speed depends on long-term accurate typhoon observation data. Therefore, based on a certain wind field model, it is the main method to simulate typhoon track and wind field by numerical simulation, and then to calculate the basic design wind speed. The wind field calculation model is mainly divided into dynamic model and empirical parameter model. There are few researches on the empirical parameter model in our country. This paper mainly studies the methods of choosing the parameters of wind field empirical parameter including roughness adjustment parameter, radial adjustment parameter, wind field asymmetry adjustment parameter, gradient height adjustment parameter and so on. The calculation parameter model of typhoon wind field suitable for southeast coastal area of China is determined. Based on the model, the basic wind speed is calculated in Xiamen area. By using the method of simulation circle, the key parameters of historical typhoon, which have a great influence on the calculation points, are selected as samples. The annual incidence of typhoon, the moving velocity of typhoon center and the radius of maximum wind speed are analyzed. The optimal probability distribution model of typhoon moving azimuth angle and typhoon center pressure difference is presented. Monte-Carlo simulation is used to simulate the typhoon in the circle for 100 years, and the extreme wind velocity series is calculated based on the parameter model. Furthermore, the design wind speed of Xiamen under different recurrence periods was calculated by extreme value distribution.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P444

【相似文献】