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Gao Y.,Hainan Provincial Lightning Protection Center | Gao Y.,Chinese Academy of Meteorological Sciences | Chen H.,Hainan Institute of Meteorological Science | Lao X.,Hainan Provincial Lightning Protection Center | And 2 more authors.
Journal of Natural Disasters | Year: 2012

With the observed thunderstorm data of 18 meteorological stations and VLF lightning locating networks data in Hainan Province, the thunderstorm environment and the characteristics of the thunderstorm activities were analyzed for the Wenchang Rocket Launching Site. The results indicate that the thunderstorm activities in the central and northern parts are stronger than those in the western, eastern and the southern coast. The Wenchang Rocket Launching Site is located in the northern area where thunderstorm activities are strong. Fitting results using the Krigine method shows that annual thunderstorm days ( Td ) of the Wenchang Rocket Launch Site have reduced gradually after 1982. Thunderstorm activities occur all the year round, and are much stronger in months from April to October than in other months, west, northwest and north of the Launch Site have stronger thunderstorm activities than other areas. 79% of the lightning currents have the strength lower than 40 kA, while only 5. 9% of the lightning currents have the strength higher than 60 kA. The occurrence of the lightning flashes has two peak time intervals in a day, one appears from 5:00 am to 6:00 am, and the another appears from 2:00 pm to 6:00 pm. The highest frequency of lightning flash activities occurs around 3:00pm in the afternoon.


Gao Y.,Hainan Provincial Lightning Protection Center | Meng X.,Hainan Provincial Lightning Protection Center | Lao X.,Hainan Provincial Lightning Protection Center
Journal of Natural Disasters | Year: 2013

From the national collected data of lightning disasters from 1998 to 2009, the observational thunderstorm data of 18 meteorological stations, and lightning locating networks data and economy and population data in statistical yearbook of Hainan Province, the indices representing hazard-formative factor, hazard pregnant environment and hazard-affected body of lightning was selected. Through R-Cluster analysis, the indices influencing vulnerability were screened and checked. Based on 5 indices, i. e., thunderstorm days, lightning density above 50 kA, thunderstorm frequency, casualty frequency and regional vulnerability economic modulus as basic variables, similarity measures of samples were calculated. With Ward's method in Q-Cluster, the hierarchy cluster analysis was carried out and Q-iterative cluster was adopted to explain and testify the result of the cluster. Finally the zoning of lightning risk in Hainan Island was constructed. Results show that Haikou City is within the first category zone, whose vulnerability is extremely high, with comprehensive vulnerability as high as 3. 89; Wencang, Chenmai, Linggao, Dingan, Tuncang and Qionghai are in the second category zone, whose vulnerability is just next to the extremely high zones; Danzhou, Qiongzhong, Baisha, Tongshi, Baoting are in the third category zone with moderate risks; Changjiang, Dongfang, Ledong,Wannin, Lingshui and Sanya are in the fourth category zone with weak risks.

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