建筑物顶端几何特征对上行先导起始影响的3D模拟  

3D Simulation Research on the Effect of Geometric Characteristics of Building Tip on the Initiation of Upward Leader

作　　者：郭秀峰 高玥 章玲 赵念 汪兆霞 黄可洋 GUO Xiu-feng;GAO Yue;ZHANG Ling;ZHAO Nian;WANG Zhao-xia;HUANG Ke-yang(College of Electronic and Information Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,China;State Key Laboratory of Severe Weather,Chinese Academy of Meteorological Sciences,Beijing 100081,China;College of Atmosphere and Remote Sensing,Wuxi University,Wuxi 214105,China)

机构地区：[1]南京信息工程大学电子与信息工程学院,南京210044 [2]中国气象科学研究院灾害天气国家重点实验室,北京100081 [3]无锡学院大气与遥感学院,无锡214105

出　　处：《科学技术与工程》2024年第15期6154-6163,共10页Science Technology and Engineering

基　　金：国家自然科学基金(42205078);江苏省基础研究计划(自然科学基金)青年基金(BK20190147);江苏省高等学校自然科学研究面上项目(21KJB170007,22KJB170021);灾害天气国家重点实验室开放课题(2021LASW-B04);2021年山东自然科学青年基金(ZR2021QD023);江苏省科协青年科技人才托举工程项目;江苏省高校“青蓝工程”优秀青年骨干教师项目。

摘　　要：建筑物几何特征对上行先导始发具有重要影响,基于三维变网格雷击物理模型,在不同几何特征建筑物和不同雷电流峰值情况下,探讨了下行负地闪过程中,建筑物顶部上行正先导始发影响因素。除了发现建筑物高度对先导的始发具有促进作用外,还得到以下结论:①雷电流峰值I_(P)相同时,建筑物的高度越高,其几何形状对上行稳定先导起始的影响(η)就越小。建筑物高度相同时,雷电流峰值越大,η越小;②圆柱塔形尖端的上行稳定先导最容易起始,且最接近针形,η最小,为12.2%。长方体形上的稳定先导起始最晚,η最大,可达53.4%;③对于高度较矮和雷电流峰值较小的情况下,尖端几何形状(塔形或斜坡)对先导起始的影响较明显。The geometric characteristics of the building have an important effect on the initiation of the upward leader.Based on a three-dimensional variable grid physical lightning model,in the case of buildings with different geometric characteristics and the peak current(I_(P))of the lightning strike,the influence factors of upward positive leader initiation at the tip of buildings during the development of downward negative cloud-to-ground flash is discussed.In addition to finding that,the height of the building has a promoting effect on the initiation of the leader.The following conclusions have obtained.For the same I P,the taller the building,the smaller the difference(η)of its geometric on the leader initiation;for the buildings of the same height,as I P increases,theηbecomes smaller.The stable leader at the tip of the cylindrical tower type is the easiest to initiate and the closest to the needle,the smallestηhave reached at 12.2%.The stable leader at tip of the cuboid type is the latest to initiates,the largestηhave reached at 53.4%.For the case of short building and weaker I P,the geometric characteristics of tip(tower or slope)has a significant effect on the leader initiation.

关 键 词：高建筑物 上行先导 几何形状 雷电流峰值 

分 类 号：P404[天文地球—大气科学及气象学]