Characteristics of Downward Cloud-to-ground Lightning Flashes Around Canton Tower Based on Optical Observations

Wu Shanshan; Lü Weitao; Qi Qi; Wu Bin; Chen Lüwen; Su Zhiguo; Jiang Ruijiao; Zhang Changxiu

doi:10.11898/1001-7313.20190207

Vol.30, NO.2, 2019

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Wu Shanshan, Lü Weitao, Qi Qi, et al. Characteristics of downward cloud-to-ground lightning flashes around Canton Tower based on optical observations. J Appl Meteor Sci, 2019, 30(2): 203-210. DOI: 10.11898/1001-7313.20190207.

Citation:

Wu Shanshan, Lü Weitao, Qi Qi, et al. Characteristics of downward cloud-to-ground lightning flashes around Canton Tower based on optical observations. J Appl Meteor Sci, 2019, 30(2): 203-210. DOI: 10.11898/1001-7313.20190207.

Citation:

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Characteristics of Downward Cloud-to-ground Lightning Flashes Around Canton Tower Based on Optical Observations

DOI: 10.11898/1001-7313.20190207

1.
Laboratory of Lightning Physics and Protection Engineering/State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081
2.
Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou 510080
3.
Sinopec Research Institute of Safety Engineering, Qingdao 266071

Received Date: 2018-07-23
Rev Recd Date: 2018-10-31
Publish Date: 2019-03-31

Abstract

Abstract

With the progress on the research of lightning hitting high buildings, influences of high buildings on characteristics of cloud-to-ground lightning flashes in the nearby area still need further research. At present, this kind of research are mainly based on data obtained by lightning location system, while optical observations are more visible and should be better considered. Results of optical observations can deepen our understanding of high-building impacts on characteristics of downward cloud-to-ground lightning flashes activity in nearby areas and provide basic data for lightning protection design of high buildings and nearby areas.Based on optical data of Tall-Object Lightning Observatory in Guangzhou (TOLOG) from 2009 to 2014, combined with the lightning acoustics and electromagnetic field variation waveform data, distribution characteristics of 119 downward cloud-to-ground lightning flashes in the northwest of Canton Tower within 3 km in 60° sector region are analyzed statistically. Results show that 43.7% (52/119) of downward cloud-to-ground lightning flashes occurs on four tallest buildings in the area. Lightnings hit Canton Tower, Canton West Tower, Canton East Tower and Guangsheng Building for 20, 12, 10 and 10 times, respectively. Besides 20 (16.8%) flashes directly hit Canton Tower, no downward lightning is observed within 1 km distance from Canton Tower (11.1% of total area). The closest stroke point to Canton Tower is about 1.2 km away. 35 (29.4%) lightning flashes are observed in the area of 1-2 km away from Canton Tower (33.3% of total area). Building lower than 300 m is hit no more than once in the area each. 64 (53.8%) lightning flashes are observed in 2-3 km away from Canton Tower (55.6% of total area). Some buildings with a height below 300 m are hit more than once, up to 5 times. The attraction of Canton Tower to downward cloud-to-ground lightning flashes makes no downward cloud-to-ground flashes observed in the vicinity of 1 km or so. The relative density of the flash (excluding flashes hitting buildings with a height of more than 300 m) increases gradually with the increase of distance. Results indicate that the attraction of high buildings to the downward cloud-to-ground lightning flashes gradually weakens with the increase of distance.
- downward cloud-to-ground lightning flash;
- tall building;
- relative flash density

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References(30)

Figures and Tables

Fig. 1 High buildings within the view of TOLOG by the end of 2014

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图 2 TOLOG观测站和高度不低于300 m的建筑物相对位置

(广州塔(A)为原点，B：东塔，C：西塔，D：广晟大厦，E：珠江城，F：利通大厦，G：越秀金融大厦，H：富力盈凯大厦；虚线指示TOLOG光学观测系统视野范围)

Fig. 2 The relative position of TOLOG observatory and buildings with a height no less than 300 m

(using Guangzhou Tower(A) as the origin, B:Canton East Tower, C:Canton West Tower, D:Guangsheng Building, E:Pearl River Tower, F:Leatop Plaza, G:Yuexiu Financial Building, H:R & F Yingkai Building; dashed lines denote the view of TOLOG)

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图 3 119次下行地闪击中48个建筑物平面分布

(数字为大于1次的击中次数)

Fig. 3 Distribution of 48 structures hit by 119 downward lightning flashes

(numbers denote being hit more than 1 times)

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Fig. 4 Relationship between the distance from buildings to Canton Tower and number of flash

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Fig. 5 The variation of relative flash density near Canton Tower with distance

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Table 1 The information of buildings with the number of downward cloud-to-ground lightning flashes no less than 10 times

名称	建成年份	高度/m	r/km	地闪次数	回击次数	最大回击次数	平均回击次数
广州塔	2009	600	0	20	54	15	2.7
西塔	2009	440	1.25	12	48	9	4.0
东塔	2014	530	1.26	10	23	6	2.3
广晟大厦	2011	360	2.08	10	29	17	2.9

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