气象学报Issue(3)：546-556,11.DOI:10.11676/qxxb2015.027
建筑物高度对上行闪电触发以及传播影响的数值模拟
A numerical simulation of the effects of building height on single upward lightning trigger and propagation
摘要
Abstract
Combined with the stochastic lightning parameterization scheme of self-initiated upward lightning,a fixed back-ground electric field is set,and then 2-dimensional fine-resolution lightning discharge simulations are performed to investigate the effect of building height on single upward lightning trigger and propagation.The results show:(1 )The upward lightning branch is less in the initial stage;to about 2 km away from the ground,the upward lightning begins to appear a lot of branch, the lightning channel begins to appear obvious bifurcation:some part of the path transmits to the high charge density centre vertically,and another part of the channel bypasses the high charge density with outward horizontal transmission;the upward lightning vertical transmission reaches only to 4 km,where is the negative charge center located,and it is unable to reach, through the zero potential line,to the positive charge area above.(2)Building height plays a key role in upward lightning trig-ger,and it is more likely to trigger the upward lightning with the increasing height.And (3)building height has certain adverse effect on upward lightning spread,and with the increase of building height,the horizontal and vertical propagation distance of upward lightning,the fractal dimension and the total propagation length of the lightning channel are all decreased gradually.关键词
建筑物高度/上行闪电/触发条件/传播特征/数值模拟Key words
Building height/Upward lightning/Trigger condition/Propagation characteristics/Numerical simulation分类
天文与地球科学引用本文复制引用
谭涌波,周博文,郭秀峰,张冬冬,师正,陈超..建筑物高度对上行闪电触发以及传播影响的数值模拟[J].气象学报,2015,(3):546-556,11.基金项目
资助课题国家重点基础研究发展计划项目（2014CB441403）、国家自然科学基金项目（41175003）。 （）
