Lightning Characteristics and Protective Efficiency in Wuhan Area
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Abstract:
The lightning characteristics and protective efficiency in the Wuhan area are analyzed statistically, based on the cloudground lightning data from March 2006 to February 2009. The results indicate: the annual mean number of cloudground lightning flashes in the Wuhan area is 45693; the negative lightning accounts for 960% of the total and the average negative lightning intensity is 326 kA; the positive lightning accounts for 40% of the total and the average positive lightning intensity is 383 kA. The number of lightning flashes from April to August accounts for 969% of the annual total, and that from July to August accounts for 708%, that from September to March of next year for 31%. The positive and negative lightning intensites are mostly within the range of 10 kA to 50 kA, and the average steepness is about 12 kA/μs. The accumulation probability equation for the lightning current bigger than certain amplitude is formulated by several statistical methods. The border areas of the southwestern Xinzhou and southeastern Huangpi and the eastern Jiangxia are highdensity lightning centers, where the annual mean lightning number of lightning flushes is above 85 /km2. According to the threegrade lightning protection category, the shielding failure rate is 13%, 33% and 115% ,and the counterattack rate is 01%、02%、16%, respectively. The results can be used as references in lightning protection engineering design and lightning risk assessment.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.