[Objective]The study aimed to discuss the relationship between thunderstorm days and lightning density. [Method]Based on the data of lightning density and thunderstorm days in Dalian region from 2007 to 2011,the optim...[Objective]The study aimed to discuss the relationship between thunderstorm days and lightning density. [Method]Based on the data of lightning density and thunderstorm days in Dalian region from 2007 to 2011,the optimal radius for the assessment of lightning risk was determined firstly,and then the relationship between thunderstorm days and lightning density in Dalian was fitted using the least square method. [Result]The optimal radius for the assessment of lightning risk was 25 km. The relation between lightning density and thunderstorm days could be fitted well by the formula y =0. 091x2-3. 447 2x ＋34. 713. [Conclusion]The fitting result was consistent with the actual situation,so the formula can be used in relative studies of Dalian.展开更多
Based on the lightning data acquired by a lightning imaging sensor(LIS)carried on the TRMM satellite from 1998 to 2013,the spatial distribution,seasonal,monthly,and diurnal characteristics of lightning activity in the...Based on the lightning data acquired by a lightning imaging sensor(LIS)carried on the TRMM satellite from 1998 to 2013,the spatial distribution,seasonal,monthly,and diurnal characteristics of lightning activity in the Pan-Pearl River Delta were analyzed.The results show that in the Pan-Pearl River Delta,lightning activity was more in the south and less in the north.Near 23°N,lightning density was high from Guangdong and Guangxi to the southern edge of Yunnan.Lightning density weakened continuously as the latitude increased.Among the provinces in the Pan-Pearl River Delta,the maximum and average of lightning density in Hainan Province was greater than that of other provinces.Besides,the lightning activity showed obvious seasonal changes.In the whole year,lightning activity was the weakest in November and next February.Lightning activity in most areas of the Pan-Pearl River Delta was the strongest in August.The peak of lightning activity in most areas of the Pan-Pearl River Delta occurred from 12:00 to 20:00.Lightning activity was the weakest between 07:00 and 10:00 in most areas.展开更多
By using monitoring data of lightning locating system in Hebei during 1999- 2010 and lightning disaster data in Hebei during 2002- 2010,temporal-spatial distribution characteristics of ground flash and lightning disas...By using monitoring data of lightning locating system in Hebei during 1999- 2010 and lightning disaster data in Hebei during 2002- 2010,temporal-spatial distribution characteristics of ground flash and lightning disaster in Hebei Province were analyzed. Annual,monthly and daily changes of ground flash,lightning current intensity and ground flash density in Hebei were analyzed,and we compared ground flash with lightning disaster distribution.展开更多
The problems in calculating parameters of equivalent collection area,earth resistivity and lightning protection category as well as their effects on lightning disaster risk assessment were analyzed,and practical examp...The problems in calculating parameters of equivalent collection area,earth resistivity and lightning protection category as well as their effects on lightning disaster risk assessment were analyzed,and practical examples proved the effects of those differences on lightning protection identification,intercept efficiency calculation in evaluating lightning disaster risk. In the meantime,several new concepts,such as the height of buildings for lightning protection were defined,and a fixed radius value was set to the ground flash density for calculation,establishing the ground flash density formula to solve the problems in parameter calculation,which would be beneficial to promote the standardization of lightning disaster risk assessment.展开更多
文摘[Objective]The study aimed to discuss the relationship between thunderstorm days and lightning density. [Method]Based on the data of lightning density and thunderstorm days in Dalian region from 2007 to 2011,the optimal radius for the assessment of lightning risk was determined firstly,and then the relationship between thunderstorm days and lightning density in Dalian was fitted using the least square method. [Result]The optimal radius for the assessment of lightning risk was 25 km. The relation between lightning density and thunderstorm days could be fitted well by the formula y =0. 091x2-3. 447 2x ＋34. 713. [Conclusion]The fitting result was consistent with the actual situation,so the formula can be used in relative studies of Dalian.
基金Supported by the National Natural Science Foundation of China(42065006)the Second Tibetan Plateau Scientific Expedition and Research(STEP)Program(2019QZKK0105)the Science and Technology Program of Yunnan"Impact Assessments and Monitor-forecasting Technology of Meteorological Disasters for Yunnan Plateau Characteristic Agriculture under Climate Change"(2018BC007).
文摘Based on the lightning data acquired by a lightning imaging sensor(LIS)carried on the TRMM satellite from 1998 to 2013,the spatial distribution,seasonal,monthly,and diurnal characteristics of lightning activity in the Pan-Pearl River Delta were analyzed.The results show that in the Pan-Pearl River Delta,lightning activity was more in the south and less in the north.Near 23°N,lightning density was high from Guangdong and Guangxi to the southern edge of Yunnan.Lightning density weakened continuously as the latitude increased.Among the provinces in the Pan-Pearl River Delta,the maximum and average of lightning density in Hainan Province was greater than that of other provinces.Besides,the lightning activity showed obvious seasonal changes.In the whole year,lightning activity was the weakest in November and next February.Lightning activity in most areas of the Pan-Pearl River Delta was the strongest in August.The peak of lightning activity in most areas of the Pan-Pearl River Delta occurred from 12:00 to 20:00.Lightning activity was the weakest between 07:00 and 10:00 in most areas.
文摘By using monitoring data of lightning locating system in Hebei during 1999- 2010 and lightning disaster data in Hebei during 2002- 2010,temporal-spatial distribution characteristics of ground flash and lightning disaster in Hebei Province were analyzed. Annual,monthly and daily changes of ground flash,lightning current intensity and ground flash density in Hebei were analyzed,and we compared ground flash with lightning disaster distribution.
文摘The problems in calculating parameters of equivalent collection area,earth resistivity and lightning protection category as well as their effects on lightning disaster risk assessment were analyzed,and practical examples proved the effects of those differences on lightning protection identification,intercept efficiency calculation in evaluating lightning disaster risk. In the meantime,several new concepts,such as the height of buildings for lightning protection were defined,and a fixed radius value was set to the ground flash density for calculation,establishing the ground flash density formula to solve the problems in parameter calculation,which would be beneficial to promote the standardization of lightning disaster risk assessment.
