建筑物斜坡角度对稳定上行先导起始影响

郭秀峰; 赵念; 高玥; 章玲; 汪兆霞; 赵宇彬; 张贺

doi:10.11898/1001-7313.20240605

建筑物斜坡角度对稳定上行先导起始影响

DOI: 10.11898/1001-7313.20240605

郭秀峰^1,2,3, ,,
赵念¹,
高玥¹,
章玲¹,
汪兆霞¹,
赵宇彬¹,
张贺¹

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/中国气象局雷电重点开放实验室, 北京 100081;
3. 无锡学院大气与遥感学院, 无锡 214105

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郭秀峰,guoxf_88@163.com

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- 收稿日期: 2024-06-12
- 修回日期: 2024-09-24
- 网络出版日期: 2024-11-07

Influences of Building Slope Angle on the Initiation of Stable Upward Leader

1. College of Electronic and Information Engineering, Nanjing University of Information Science & Technology, Nanjing 210044;
2. State Key Laboratory of Severe Weather & CMA Key Laboratory of Lightning, Chinese Academy of Meteorological Sciences, Beijing 100081;
3. College of Atmosphere and Remote Sensing, Wuxi University, Wuxi 214105

摘要

摘要: 建筑物斜坡角度(顶角)对上行先导的始发具有重要影响。该文基于已建立的三维变网格先导模型,模拟斜坡型高建筑物雷击过程,讨论斜坡角度在不同建筑物高度和雷电流峰值下,对稳定上行先导始发的影响程度和规律。研究表明:当雷电流峰值相同时,建筑物高度越小宽度越宽,斜坡角度对稳定上行先导起始的影响越大,先导始发越困难。当建筑物高度相同时,雷电流峰值越小,斜坡角度对稳定上行先导起始的影响越大。斜坡角度对稳定上行先导起始的影响会随着建筑物高度和雷电流峰值的增加而减小。通过将斜坡角度对稳定上行先导起始的影响作为因变量,斜坡角度、建筑物高度以及雷电流峰值作为自变量进行多元线性回归分析,得到对上行先导的影响程度:雷电流峰值最大,斜坡角度次之,建筑物高度最小。在常见的建筑物高度(100 m以下)和雷电流峰值(小于40 kA)下,斜坡角度对稳定上行先导起始的影响不可忽略(大于23.32%),但在建筑物高度较高(500 m以上)且雷电流峰值较大(大于100 kA)情况下,斜坡角度对稳定上行先导起始的影响相对较小(小于15.88%)。
- 斜坡型建筑物;
- 斜坡角度;
- 上行先导;
- 数值模拟
Abstract: The slope angle (or top angle) of the building significantly influences the formation of upward leader. To simulate the lightning strike process on tall and sloping building using three-dimensional variable grid leader model, the influence of slope angle (θ) on the initiation of stable upward leaders is analyzed, focusing on various building heights (H_b) and peak values of lightning current (I_p). It can be concluded from data that, when the peak lightning current is held constant, reducing the building height and increasing the building width result in an enhanced influence of the slope angle on stable upward leader inception (η), which in turn makes it increasingly challenging to incept. When the height of building is held constant, a reduction in the peak value of lightning current enhances the influence of slope angle on the inception of stable upward leaders (η). This, in turn, makes the inception process increasingly challenging. Changes in building width have a lesser impact on the initiation of the upward leader compared to building height. As heights of buildings and peak values of lightning currents increase, the influence of slope angle on the initiation of stable upward leader becomes less significant. By conducting a multiple linear regression analysis with η as the dependent variable and slope angle (θ), building height (H_b), and peak lightning current (I_p) as independent variables. Results indicate that I_p and H_b have a significant negative effect on η, whereas θ has a positive effect on η. The degree of influence on η is as follows: I_p has the greatest influence, followed by θ, while Hb has the least influence. The influence of slope angle on the inception of stable upward leaders, represented by the parameter η, is significant for building heights below 100 m and peak lightning current values below 40 kA, with the estimated effect exceeding 23.32%. In contrast, for building heights exceeding 500 m and peak values of lightning current above 100 kA, the impact of slope angle on stable upward leader inception is relatively minimal, with an estimated effect of less than 15.88%, in the case, the distinction between the impact of sloped buildings and rectangular buildings on the inception of stable upward leader is sufficiently marginal to enable an approximate analytical approach.
- slope buildings;
- slope angle;
- upward leader;
- numerical simulation

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参考文献(35)

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建筑物斜坡角度对稳定上行先导起始影响

DOI: 10.11898/1001-7313.20240605

通信作者:
郭秀峰,guoxf_88@163.com

计量

Influences of Building Slope Angle on the Initiation of Stable Upward Leader

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目录

留言板

建筑物斜坡角度对稳定上行先导起始影响

DOI: 10.11898/1001-7313.20240605

通信作者: 郭秀峰,guoxf_88@163.com

计量

出版历程

Influences of Building Slope Angle on the Initiation of Stable Upward Leader

计量

出版历程

目录

通信作者:
郭秀峰,guoxf_88@163.com