| 土壤湿度对不规则起伏地表雷电垂直电场传播影响的研究 |
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| 引用本文： | 张源源,庞华基,徐晓亮,王欣眉,张其林,张伟.土壤湿度对不规则起伏地表雷电垂直电场传播影响的研究[J].气候与环境研究,2017,22(1):89-96. |
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| 作者姓名： | 张源源 庞华基 徐晓亮 王欣眉 张其林 张伟 |
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| 作者单位： | 青岛市气象局气象防雷中心, 青岛 266003,青岛市气象局气象防雷中心, 青岛 266003,青岛市气象局气象防雷中心, 青岛 266003,青岛市气象局气象防雷中心, 青岛 266003,南京信息工程大学气象灾害省部共建教育部重点实验室, 南京 210044,青岛市气象局气象防雷中心, 青岛 266003 |
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| 基金项目： | 青岛市气象局业务短平快项目2015qdqxd06 |
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| 摘 要： | 本文采用二维fractional Brown motion(f Bm)随机分形界面模拟不规则起伏地表,基于Longmire-Scott提出的土壤电参数等效模型(L-S模型),分析研究不规则起伏地表的土壤湿度对地闪回击垂直电场传播的影响。结果表明:(1)地表的不规则起伏程度主要会引起垂直电场峰值的衰减和上升沿时间的滞后。随着地表不规则起伏程度的增大,垂直电场峰值衰减越明显,且波形上升沿时间增长。(2)无论地表不规则程度如何,随着土壤湿度的增大,垂直电场的衰减反而减小。(3)总的来说,地表的不规则程度越大,土壤湿度越小,垂直电场的峰值衰减越大,波头上升沿时间越长。
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| 关 键 词： | 分形不规则起伏地表 土壤湿度 雷电回击 垂直电场 |
| 收稿时间： | 2016/1/25 0:00:00 |
The Propagation Effect of Soil Moisture on Lightning Vertical Electric Field over Irregular Terrain |
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| ZHANG Yuanyuan,PANG Huaji,XU Xiaoliang,WANG Xinmei,ZHANG Qilin and ZHANG Wei.The Propagation Effect of Soil Moisture on Lightning Vertical Electric Field over Irregular Terrain[J].Climatic and Environmental Research,2017,22(1):89-96. |
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| Authors: | ZHANG Yuanyuan PANG Huaji XU Xiaoliang WANG Xinmei ZHANG Qilin and ZHANG Wei |
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| Institution: | Lightning Protection Center, Qingdao Meteorological Bureau, Qingdao 266003,Lightning Protection Center, Qingdao Meteorological Bureau, Qingdao 266003,Lightning Protection Center, Qingdao Meteorological Bureau, Qingdao 266003,Lightning Protection Center, Qingdao Meteorological Bureau, Qingdao 266003,Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science & Technology, Nanjing 210044 and Lightning Protection Center, Qingdao Meteorological Bureau, Qingdao 266003 |
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| Abstract: | A two-dimensional fractional Brown motion (fBm) model was used to describe the irregular terrain, and the Longmire-Scott soil-parameter frequency dependent model was applied to investigate the propagation effect of soil moisture on the lightning vertical electric field over irregular terrains. Main results are as follows:(1) The surface irregularity can lead to the attenuation of the magnitude of the vertical electric field and lags of the rise time of the field waveform. With the increase in the surface irregularity, the attenuation of the vertical electric field intensifies and the rise time of the field waveform increases. (2) Regardless of the degree of surface irregularity, increases in the soil moisture will reduce the attenuation of the vertical electric field. (3) Generally, increases in the surface irregularity and decreases in the soil moisture can result in stronger attenuation of the vertical electric field and longer rise time of the field waveform. |
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| Keywords: | Fractal irregular terrain Soil moisture Lightning return stroke Vertical electric field |
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