| 郭泉,吕君.北京地区山背波监测与特征分析[J].声学技术,2015,34(3):247~251 |
| 北京地区山背波监测与特征分析 |
| Detection and characteristic analysis of mountain wave occurred around Beijing area by using infrasound microphone array |
| 投稿时间：2014-03-20 修订日期：2014-06-21 |
| DOI：10.3969/j.issn1000-3630.2015.03.012 |
| 中文关键词: 小孔径阵列 山背波 定位 统计特征 |
| 英文关键词: small aperture array mountain wave localization statistical characteristic |
| 基金项目:国家自然科学基金面上项目(11074278、11174320) |
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| 中文摘要: |
| 利用北京西北地区布置的小孔径大气次声传感器网络,利用有效来波判断方法搜寻有效来波,并使用最小方差空间搜索方法定位波源,分析经常发生并对正常观测造成干扰的一种次声波—山背波信号的特征规律:幅度、频谱、波源位置、波速、来波方向及发生时间统计规律。对2013年4~5月的次声波记录数据进行分析,结果显示:低于0.02 Hz频段,各传感器经常性接收到来自于西北山区方位的次声波,幅度一般在10~20 Pa,中心频率处于0.002~0.005 Hz,最小方差法定位结果显示信号源大多自北京西山的面向阵列的一侧,方位角统计结果显示大多数在260°~360°、0°~40°,且传播速度为10~50 m/s,该波的发生与当地的风速风向具有相关性。 |
| 英文摘要: |
| The characteristics of mountain wave occurred in the Western hill of Beijing by using small aperture infrasound array, including amplitude, spectrum, azimuth of arrival wave, wave source location and statistical law, are studied in this paper, also the problems about the detection threshold and the least squares localization of the mountain wave are considered. The infrasound recordings over two month from 2013/04 to 05 are analyzed, and the result shows that the low frequency infrasonic wave from northwest mountain area is usually detected by the array, whose amplitude is 10~20 Pa and centre frequency is 0.002-0.005 Hz. The wave is mostly from hillside face to the array, and the azimuths of arrival wave are nearly 260-360 and 0-40 degrees respectively, moreover, the wave velocity is 10~50m/s and the occurrence of this wave is correlated with local wind speed and direction. |
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