Observation and Analysis on Qiongzhou Strait Gales of Severe Typhoon Neasat (2011)
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摘要: 根据琼州海峡两岸2个梯度塔和1部车载风廓线雷达共同获取的强台风纳沙 (1117) 实测风速资料,分析强台风纳沙影响期间大风特性,发现以下观测事实和变化规律:位于台风移动路径右侧的测风站,其风向呈顺时针方向旋转,台风眼区经过的测风站,其最大风速接近35 m·s-1,且风向旋转超过180°,台风外围大风区经过的测风站其最大风速达到30 m·s-1,风向旋转73°;大风风切变过程可用对数函数和指数函数拟合,对数函数和指数函数对光滑下垫面的拟合效果更好,且对数函数拟合效果要略优于指数函数;阵风系数随风速增大而减小,但风速达到6级以后,阵风系数不随风速大小产生趋势变化,阵风系数与下垫面粗糙度有关,在粗糙下垫面上阵风系数会偏大;大风阵风系数随高度变化可用指数函数来描述,且对来自光滑下垫面的近地层大风阵风系数拟合效果更好。该观测个例的大风风切变指数与GB/T 18710—2002的推荐值存在差异——粗糙下垫面的大风风切变指数大于标准推荐值,而来自光滑下垫面的大风风切变指数则小于GB/T 18710—2002的推荐值。
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关键词:
- 强台风纳沙 (1117);
- 风切变;
- 阵风系数;
- 琼州海峡
Abstract: Based on wind data of a severe typhoon observed by two meteorological towers and one motive wind profile radar which are located on both sides of Qiongzhou Strait at the inshore sea, the gale features of the severe typhoon Neasat (2011), maximum wind speed, gust factor and wind profile index variation characteristics of typhoon Neasat (2011) are analyzed.On the right side of the typhoon path, the wind direction is clockwise on the Northern Hemisphere; the maximum 10-minute average wind speed observed in typhoon eye district is near 35 m·s-1, and the wind direction rotation is over 180°; the maximum 10-minute average wind speed in periphery district is near 30 m·s-1, and the wind direction around has rotated by 73°. Wind shear process can be fitted by exponential function and logarithmic function, which both fit well for smooth underlying surface, and the logarithmic function is slightly superior to exponential function.Gust factor decreases with increasing wind speed until the wind speed reaches level 6, and rougher underlying surface leads to bigger gust factor.The relation between wind gust factor and the height can be fitted by exponential function, especially when the surface is smooth.Compared with GB/T 18710—2002 recommended value, the gale shear index calculated over rough underlying surface during typhoon Neasat (2011) is higher than the recommended value, while over the smooth underlying surface it is lower than the recommended value.-
Key words:
- severe typhoon Neasat (2011);
- wind shear;
- gust factor;
- Qiongzhou Strait
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表 1 Airda3000Q型边界层风廓线雷达主要技术参数
Table 1 Main technical parameters of Airda3000Q boundary layer wind profile radar
参数名称 参数 参数名称 低模式参数 雷达波长 0.23256 m 脉冲宽度 0.33 μs 波束宽度 9° 探测高度范围 3450 m以下 波束数 5 噪声系数 2 dB 天线增益 不低于25 dB 高度分辨率 50 m 波束仰角 70° 相干积累次数 216 发射峰值功率 1500 W FFT点数 64 探测盲区 50 m以下 带宽 3.0 MHz (滤波器) -
[1] 许映龙, 张玲, 高拴柱.我国台风预报业务的现状及思考.气象, 2010, 36(7):43-49. doi: 10.7519/j.issn.1000-0526.2010.07.009 [2] 陈联寿, 丁一汇.西太平洋台风概论.北京:科学出版社, 1979. [3] 王同美, 温之平, 李彦, 等.登陆广东热带气旋统计及个例的对比分析.中山大学学报:自然科学版, 2003, 42(5):97-100. http://www.cnki.com.cn/Article/CJFDTOTAL-ZSDZ200305026.htm [4] 段丽, 陈联寿.热带风暴"菲特"(0114) 特大暴雨的诊断研究.大气科学, 2005, 29(3):343-353. http://www.cnki.com.cn/Article/CJFDTOTAL-DQXK200503001.htm [5] 陈联寿, 罗哲贤, 李英.登陆热带气旋研究的进展.气象学报, 2004, 62(5):541-549. doi: 10.11676/qxxb2004.055 [6] Lee W C, Jou B J D, Chang P L, et al.Tropical cyclone kinematic structure retrieved f rom single Doppler radar observations.Part Ⅰ:Interpret ation of Doppler velocity patterns and the GBVTD technique.Mon Wea Rev, 1999, 127:2419-2439. [7] Lee W C, Marks F D.Tropical cyclone kinematic structure retrieved from single Doppler radar observations.Part Ⅱ:The GBVTD-simplex center finding algorithm.Mon Wea Rev, 2000, 128:1925-1936. [8] Zhao K, Lee W C, Jou B J D.Single Doppler radar observation of the concentric eye wall in typhoon Saomai (2006) near landfall.Geophys Res Lett, 2008, 35:7807-7808. [9] 朱龙彪, 郑铮, 何彩芬.0414号台风"云娜"多普勒雷达探测.应用气象学报, 2005, 16(4):500-508. doi: 10.11898/1001-7313.20050411 [10] 魏应植, 汤达章, 许健民, 等.多普勒雷达探测"艾利"台风风场不对称结构.应用气象学报, 2007, 18(3):285-294. http://qikan.camscma.cn/jams/ch/reader/view_abstract.aspx?file_no=20070350&flag=1 [11] 魏应植, 吴陈锋, 苏卫东.利用多普勒雷达径向速度提取风环境风场信息.应用气象学报, 2010, 21(3):307-316. doi: 10.11898/1001-7313.20100306 [12] 宋丽莉, 毛慧琴, 汤海燕, 等.广东沿海近地层大风特性的观测分析.热带气象学报, 2004, 20(6):731-736. http://www.cnki.com.cn/Article/CJFDTOTAL-RDQX20040600D.htm [13] 钟颖旻, 徐明, 王元.Chaba (0417) 台风变性前后热力结构特征.应用气象学报, 2008, 19(5):588-594. doi: 10.11898/1001-7313.20080510 [14] Liu Y, Zhang D L, Yau M K.A multiscale numerical study of hurricane andrew (1992).PartⅠ:Explicit simulation and verification.Mon Wea Rev, 1999, 125:3073-3093. [15] 魏超时, 赵坤, 余晖, 等.登陆台风卡努 (0515) 内核区环流结构特征分析.大气科学, 2011, 35(1):68-80. http://www.cnki.com.cn/Article/CJFDTOTAL-DQXK201101007.htm [16] 何洁琳, 管兆勇, 农孟松, 等.冬季台风"南玛都"结构性质的初步研究.热带气象学报, 2008, 24(1):51-58. http://www.cnki.com.cn/Article/CJFDTOTAL-RDQX200801008.htm [17] 陈子通, 闫敬华, 丁伟钰, 等.尤特台风登陆过程中眼区结构变化的分析研究.大气科学, 2004, 28(3):471-478. http://www.cnki.com.cn/Article/CJFDTOTAL-DQXK200403012.htm [18] 宋丽莉, 毛慧琴, 黄浩辉, 等.登陆台风近地层湍流特性观测研究.气象学报, 2005, 63(6):915-921. doi: 10.11676/qxxb2005.087 [19] 建筑结构荷载规范. 中华人民共和国国家标准GB 50009—2012. 2012. [20] 宋丽莉, 陈雯超, 黄浩辉.工程抗台风研究中风观测数据的可靠性和代表性判别.气象科技进展, 2011, 1(1):35-43. http://www.cnki.com.cn/Article/CJFDTOTAL-QXKZ201101009.htm [21] 张容焱, 张秀芝, 杨校生, 等.台风莫拉克 (0908) 影响期间近地层风特性.应用气象学报, 2012, 23(2):184-194. doi: 10.11898/1001-7313.20120207 [22] 陈雯超, 宋丽莉, 植石群, 等.不同下垫面的热带气旋强风阵风系数研究.中国科学:科学技术, 2011, 41(11):1449-1459. http://www.cnki.com.cn/Article/CJFDTOTAL-JEXK201111006.htm [23] 王志春, 宋丽莉, 何秋生, 等.风速随高度变化的曲线模型分析.热带气象学报, 2007, 23(6):690-692. http://www.cnki.com.cn/Article/CJFDTOTAL-RDQX200706025.htm [24] Stull R B.An Introduction to Boundary Layer Meteorology.Dordretch:Klumer Academic Publishers, 1990. [25] 风电场风能资源评估方法. 中华人民共和国国家标准GB/T 18710—2002. 2002.