| 复杂地形对雷电云地闪观测电磁场传输影响的实例分析 |
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| 引用本文： | 纪奎秀,张亮,卜俊伟,等.复杂地形对雷电云地闪观测电磁场传输影响的实例分析[J].高原山地气象研究,2017,37(4):78-83. |
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| 作者姓名： | 纪奎秀 张亮 卜俊伟 等 |
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| 作者单位： | 1. 四川省气象探测数据中心, 成都 610072; |
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| 基金项目： | 四川省气象探测数据中心科学技术研究开发(川气探数课题2017-5)基于地面电场的雷电预警指标研究(省重实验室2018-重点-01)高原与盆地暴雨旱涝灾害四川省重点实验室科技发展基金项目(2017-青年-16) |
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| 摘 要： | 考虑探测原理和地形因素，基于Barrick表面阻抗理论和Wait近似算法等理论，利用不规则起伏地表的雷电电磁场传播模式，结合四川省真实的复杂地形地表数据，以半径r=60km的二维地表为模型，分析复杂地形对雷电电磁波传输的影响。以温江和白玉典型地势为例，分析得出:温江东部平原低海拔区域，雷电电磁波传输路径延长增量的最小值仅为182m，对应的时间延迟增量为0.61μs，温江西部多山高海拔区域，路径延长增量达到最大值，为2290m，对应的时间延迟增量为7.63μs；西部高原的白玉站，此区域地表的路径延长增量都在3000m以上，路径延长增量的最小值也达到3025m，对应的时间延迟增量为10.1μs，路径延长增量达到最大值，为8283m，对应的时间延迟增量为27.6μs。由此可见，在实际雷电探测定位中，必须考虑复杂地形引起的雷电电磁波传输路径增量和相应传输时间增量的影响，才能提高雷电定位精度和效率。
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| 关 键 词： | 复杂地形 电磁波传输 路径延长增量 时间延迟增量 |
| 收稿时间： | 2017-11-03 |
Cases Study of the Influence of Complex Topography on the Observation about the Electromagnetic Transmission of Lightning Flash |
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| Affiliation: | 1. Sichuan Meteorological Observation Data Technology Center, Chengdu 610072;2. Sichuan Lightning Protection Centre, Chengdu 610072;3. Sichuan Meteorological Disaster Prevention Center, Chengdu 610072 |
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| Abstract: | Considering detection principle and terrain factors, the lightning electromagnetic field propagation mode of irregular ups and downs based on the theory of Barrick surface impedance and Wait approximate algorithm was used to analyze that complex terrain was influence on lightning electromagnetic wave transmission, which used two-dimensional surface model of 60 km combined with the real complex terrain surface data of Sichuan province. Taking the typical terrain of Wenjiang and Baiyu as an example, the results of analyses is that the minimum value of the extended increment of the lightning wave propagation path is only 182m on the low altitude area of eastern plains of Wenjiang and the corresponding time delay increment is 0.61μs. The path extension increment reaches a maximum value of 2290m and the corresponding time delay increment is 7.63μs because there are many plateaus and mountains on western of Wenjiang. The path extension increment is more than 3000m on Baiyu station of western plateau, which the minimum value is 3025m and the corresponding time delay increment is 10.1μs. The path lengthening increment reaches a maximum value of 8283m and the corresponding time delay increment is 27.6μs. It points out that the complex terrain caused by lightning electromagnetic wave propagation path increment and corresponding transmission time increment must be considered in actual lightning detection positioning in order to improve the lightning location precision and efficiency. |
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