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超强台风威马逊登陆期间近地层强风特性分析
黄浩辉1, 陈雯超1, 植石群1, 王丙兰2
(1.广东省气候中心;2.华风气象传媒集团有限责任公司)
Analysis on Strong Wind Characteristics in Surface Layer During Landfall of Super Typhoon Rammasun
HuangHaoHui1, ChenWenChao1, ZhiShiQun1, WangBingLan2
(1.Climate Center of Guangdong Province;2.Huafeng Meteorological Media Group)
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投稿时间:2020-04-22    修订日期:2020-08-19
中文摘要: 利用广东省徐闻县西连镇90m高度测风塔在1409号超强台风“威马逊”登陆期间获取的具有台风强风代表性的观测数据,对台风“威马逊”的近地层强风特性进行了分析,结果表明:(1)台风“威马逊”登陆期间,测风塔各高度风速时程曲线呈明显的“M”型分布特征,台风中心经过测风塔前后,各层风向沿逆时针方向大幅偏转约170°。(2)台风强风过程,风速随高度增加而增大,风速廓线较好地符合对数和幂指数律;从前外围强风区到前眼壁强风区,风切变指数和粗糙长度先是减少,随后到眼区、后眼壁强风区和后外围强风区,风切变指数和粗糙长度渐次增大。(3)台风强风过程,湍流强度和阵风系数在前外围强风区或后外围强风区较大,在前眼壁强风区或后眼壁强风区较小,湍流强度和阵风系数随高度增加而减小,基本符合指数为负值的幂指数律。(4)台风强风过程,外围强风区和眼壁强风区的10min风向变率变化较为平稳,而在眼区波动较为剧烈,在眼区,当各层风速达到最低值或次低值时,各层10min风向变率幅值达到最大值。
Abstract:Using the observation data obtained by the 90 m height wind tower in Xilian Town, Xuwen County, Guangdong Province during landfall of super strong typhoon Rammasun, the characteristics of strong wind in surface layer of typhoon Rammasun are analyzed. The results show that: (1) The wind speed at different heights presents clear “M” pattern. The wind direction counterclockwise deflects about 170° before and after the typhoon center passed through the wind tower. (2) The wind speed increases with the increase of height, and the wind speed profile fits well with the laws of logarithm and power index. Wind shear index and roughness length decrease first from front outer-vortex to front eye-wall and then gradually increase in the wind eye, back eye-wall and back outer-vortex. (3) In the strong wind process of typhoon, the turbulence intensity and gust factor are larger in front or back outer-vortex, and smaller in the front or back eye-wall. The turbulence intensity and gust factor decrease with the increase of height, which basically accords with the power law with negative exponent. (4) The variation of the 10min wind direction is more stable compared with that in wind eye which is rather intense. The wind speed is lowest in wind eye while the variations of the 10min wind direction reach the maximum value.
文章编号:202004220128     中图分类号:    文献标志码:
基金项目:国家自然科学基金重大项目(91215302);广东省促进经济高质量发展专项(GDOE[2019]A11)
引用文本:
黄浩辉,陈雯超,植石群,王丙兰,0.Analysis on Strong Wind Characteristics in Surface Layer During Landfall of Super Typhoon Rammasun[J].Meteor Mon,():-.
HuangHaoHui,ChenWenChao,ZhiShiQun,WangBingLan,0.Analysis on Strong Wind Characteristics in Surface Layer During Landfall of Super Typhoon Rammasun[J].Meteor Mon,():-.