| 地表湿度导致土壤电参数变化对雷电电磁场传播的影响 |
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| 引用本文： | 欧阳双,张其林,李颖,李东帅,张源源.地表湿度导致土壤电参数变化对雷电电磁场传播的影响[J].气象科技,2012,40(6):1018-1024. |
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| 作者姓名： | 欧阳双 张其林 李颖 李东帅 张源源 |
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| 作者单位： | 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;南京信息工程大学大气物理学院,南京210044 |
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| 基金项目： | 国家自然科学基金项目，中国科学院"百人计划"专项、公益性行业科研专项 |
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| 摘 要： | 基于Scott提出的土壤电参数等效模型和二维分形布朗运动粗糙地表模型,利用Cooray和Wait近似算法,研究了地表湿度引起的土壤电参数变化对雷电回击电磁场传播的影响.结果表明:土壤湿度的增加引起垂直电场和水平磁场的上升随时间减小,对峰值影响不太明显；土壤湿度对水平电场的影响很大,水平电场的峰值与湿度成反比.实际上,雷暴天气往往伴随降水,因此对雷电电磁辐射环境的研究应该考虑土壤湿度的影响.
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| 关 键 词： | 土壤湿度 土壤电导率 土壤相对电容率 雷电回击 电磁场 |
| 收稿时间： | 2011/7/13 0:00:00 |
| 修稿时间： | 2011/9/22 0:00:00 |
Impact on Lightning Electromagnetic Field Propagation of Soil Electrical Parameter Variation Induced by Varying Surface Soil Moisture |
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| Ouyang Shuang,Zhang Qilin,Li Ying,Li Dongshuai and ZhangYuanyuan.Impact on Lightning Electromagnetic Field Propagation of Soil Electrical Parameter Variation Induced by Varying Surface Soil Moisture[J].Meteorological Science and Technology,2012,40(6):1018-1024. |
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| Authors: | Ouyang Shuang Zhang Qilin Li Ying Li Dongshuai and ZhangYuanyuan |
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| Abstract: | Analysis and calculation of different ground electrical parameter variation caused by surface soil moisture are conducted, and the impact of the variation on the propagation of the electromagnetic field of lightning return strokes is examined. A two dimension fraction Brown motion model is presented for describing the natural rough surface. The adopted method is based on the Cooray and Wait approximate calculation, taking advantage of the soil electrical parameter equivalent model put forward by Scott. It is shown that the impact of surface humidity on lightning electromagnetic field propagation can not be ignored and the impact on the horizontal electric field is larger than that on the vertical electric field; the peak value of the horizontal electric field is inversely proportional to the soil moisture. With the increasing humidity, the increase of both vertical and horizontal electric fields deceases with time, but the peak values hardly change. Therefore, the impact of soil moisture must be considered when studying lightning electromagnetic radiation environments because the rainfall always accompanies with thunderstorms. |
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