次声波在近地大气中“中尺度”范围传播规律的研究

Research on mechanism of infrasound waves propagation in near-surface atmosphere of mesoscale range. Based on a constructed wide-area infrasound sensors network composed of low-frequency broad-band infrasound sensors produced by our institute, the propagation characteristics are observed and studied by acoustic image measurement. Presures fluctuations of infrasound waves in 200km range from source are presented by "rainbow imaging". Imapacts of atmospheric weather conditions such as wind field, temperature fluctuation, turbulence, vortex flow,etc. and some terrain conditions on infrasound propagation can be revealed by acoustic energies change displayed by "color cloud", spectrum change, and so on. And then, numerical models for studying on infrasound propagating in atmosphere are modified by comparing their calcualtion results with measurement results, so as to obtain a theorical model for studying on infrasound propagating in near-surface atmosphere of mesoscale range, which can lay the foundation for observing infrasound waves associated with nature events.

研究次声波在近地大气中的"中尺度"范围的传播规律。基于本单位研制的低频宽带次声传感器以及由该传感器组建而成的广域次声监测网络，以声成像测量方法来观测和研究次声波的传播特性。通过"彩虹图"成像方法来反映次声波从波源处产生后200km范围内传播的波动变化。根据传播过程中声能量的"色彩云图"变化规律，频谱变化规律等揭示次声传播过程中受大气风场、温度变化、湍流或者气流涡漩等气象条件以及地形、地貌环境的影响状况。然后，根据与实测研究结果的比较，修正次声波在大气中传播的数学模型，以构建"中尺度"范围近地大气中次声波传播的理论模型，为自然事件关联次声波的观测奠定基础。

研究得到了次声波“中尺度”范围的大气传播的三维射线法以及抛物线方程法。同时，基于本单位研制的低频宽带次声传感器以及由该传感器组建而成的广域次声监测网络，以声成像测量方法来观测和研究次声波的传播特性。通过"彩虹图"成像方法来反映次声波传播的轨迹和声压变化规律。该方法可以根据传播过程中声能量的"色彩云图"变化规律，频谱变化规律等揭示次声传播过程中受大气风场、温度变化、湍流或者气流涡漩等气象条件以及地形、地貌环境的影响状况。研究得到了"中尺度"范围近地大气中次声波传播的算法模型，为自然事件关联次声波的观测奠定基础。