| 基于LLS的多回击地闪及其雷电流幅值分布特征 |
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| 引用本文： | 王学良,成勤,王清龙,余田野,张科杰,赵涛.基于LLS的多回击地闪及其雷电流幅值分布特征[J].热带气象学报,2021,37(3):309-319. |
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| 作者姓名： | 王学良 成勤 王清龙 余田野 张科杰 赵涛 |
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| 作者单位： | 1.湖北省防雷中心，湖北 武汉 430074 |
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| 基金项目： | 湖北省气象局科技发展基金2020Q11湖北省防雷中心科研基金FL-Z-2019001 |
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| 摘 要： | 为进一步研究多回击地闪参数分布特征, 以便为雷电防护工程设计和雷电物理研究提供参考, 根据湖北省雷电定位系统(LLS)2007年1月—2018年12月监测资料, 采用计算机编程处理和数理统计方法, 对多回击地闪次数、多重回击次数和不同类型多回击地闪雷电流幅值等参数进行了统计分析。结果表明: 多回击正地闪、负地闪和总地闪次数占其地闪总数的百分比分别为2.06%、34.76%和32.64%, 多重回击次数分别占其回击总数的0.01%、0.42%和0.40%, 多回击负地闪回击次数占多回击总地闪回击总数的99.69%。首次回击强度大于后续回击强度的多回击正地闪和负地闪分别占多回击地闪总数的82.52%和57.87%;在多回击地闪后续回击中, 正地闪约有9%的后续回击强度大于首次回击强度, 负地闪约有20%的后续回击强度大于首次回击强度。多回击正地闪和负地闪中值电流分别为59.30 kA和35.10 kA, 首次回击分别为90.90 kA和40.00 kA, 后续回击中分别为43.90 kA和33.00 kA。首次回击中, 多回击正地闪和负地闪雷电流幅值大于100 kA的累积概率分别为44.06%和4.64%, 首次回击强度大于后续回击强度的多回击正地闪和负地闪雷电流幅值大于100 kA的累积概率最大分别为52.21%和7.94%;后续回击中, 多回击正地闪和负地闪雷电流幅值小于等于40 kA的累积概率分别为41.80%和69.92%, 首次回击强度大于后续回击强度的多回击负地闪, 雷电流幅值小于等于40 kA的累积概率最大为77.71%。多回击正地闪和负地闪后续回击与首次回击中值电流的比值分别为0.48和0.83。拟合得出的不同类型的多回击正地闪和负地闪雷电流幅值累积概率公式, 拟合效果显著; 拟合公式中a值附近的雷电流幅值累积概率与b值呈显著正相关关系。
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| 关 键 词： | 多回击 地闪 多重回击 中值电流 首次回击 后续回击 雷电流幅值 累积概率 |
| 收稿时间： | 2020-07-17 |
THE DISTRIBUTION CHARACTERISTICS OF MULTIPLE STROKES OF CLOUD-TO-GROUND LIGHTNING AND THEIR LIGHTNING CURRENT MAGNITUDE BASED ON LLS |
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| WANG Xueliang,CHENG Qin,WANG Qinglong,YU Tianye,ZHANG Kejie,ZHAO Tao.THE DISTRIBUTION CHARACTERISTICS OF MULTIPLE STROKES OF CLOUD-TO-GROUND LIGHTNING AND THEIR LIGHTNING CURRENT MAGNITUDE BASED ON LLS[J].Journal of Tropical Meteorology,2021,37(3):309-319. |
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| Authors: | WANG Xueliang CHENG Qin WANG Qinglong YU Tianye ZHANG Kejie ZHAO Tao |
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| Institution: | 1.Lightning Protection Center of Hubei Province, Wuhan 430074, China2.Yichang Meteorological Bureau of Hubei Province, Yichang 443000, China3.Hubei Key Laboratory of Power Grid Lightning Risk Prevention, Wuhan 430074, China |
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| Abstract: | To further investigate the distribution characteristics of multiple strokes of cloud-to-ground (CG) lightning, and to provide reference for the design of lightning protection engineering and lightning physics research, the present study analyzes the parameters such as multiple strokes lightning frequency, multiple return-strokes lightning frequency and lightning current magnitude for different types of multiple strokes lightning using computer programing and mathematical statistics method. These data were collected by the Lightning Location System (LLS) of Hubei Meteorological Service from January 2007 to December 2018. The results show that the percentage for multiple strokes of positive, negative and total CG lightning was 2.06%, 34.76% and 32.64% respectively, and the number of multiple return-strokes was 0.01%, 0.42% and 0.40% of the total number of return strokes respectively. The number of negative multiple strokes accounted for 99.69% of the multiple strokes of total CG lightning. The percentage of multiple strokes of positive and negative CG lightning in which the first return stroke intensity was greater than the subsequent was 82.52% and 57.87% of the total number of return strokes respectively. In the subsequent return stroke of multiple strokes, the percentage of the subsequent return stroke intensity of positive and negative CG lightning being greater than that of the first return stroke was about 9% and 20%, respectively. The median current for multiple strokes of positive and negative CG lightning was 59.30 kA and 35.10 kA, respectively. The first return stroke intensity was 90.90 kA and 40.00 kA, respectively, and the subsequent return stroke intensity was 43.90 kA and 33.00 kA, respectively. In the first return stroke, the cumulative probability for multiple strokes of positive and negative CG lightning in which current magnitude was greater than 100 kA was 44.06% and 4.64%, respectively. When the first return stroke intensity was greater than the subsequent return stroke intensity, the maximum cumulative probability of the positive and negative CG lightning in which current magnitude was greater than 100 kA was 52.21% and 7.94%, respectively. In the subsequent return stroke, the cumulative probability of multiple strokes of positive and negative CG lightning with current magnitude being less than or equaling to 40 kA was 41.80% and 69.92%, respectively. Besides, when the first return stroke intensity was greater than the subsequent return stroke intensity, the maximum cumulative probability of the negative CG lightning with current magnitude being less than or equaling to 40 kA was 77.71%. In the multiple strokes of positive and negative CG lightning, the ratio of the subsequent return stroke to the first return stroke was 0.48 and 0.83, respectively. The fitting results show that the cumulative probability formula of the current magnitude for multiple strokes of the positive and negative CG lightning with different types was significant. There was a significant positive correlation between the cumulative probability of lightning current magnitude near value a and value b in the fitting formula. |
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| Keywords: | multiple strokes cloud-to-ground lightning multiple return-strokes median current first return stroke subsequent return stroke lightning current magnitude cumulative probability |
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