三维超声风速仪测量近地面湍流谱及C_n^2的初步研究

Characteristics of ASL Turbulence Spectra and C_n^2 using three-dimensional ultrasonic anemometer

采用2011年1月在合肥地区复杂下垫面上使用超声风速计测得的风速三分量和温度分湍流实验观测数据,计算分析了合肥地区冬季的不同稳定度条件下的湍流谱特征。并和其他实验进行对比,得到了湍流特征量在不同稳定度下能量谱的曲线拟合公式以及谱峰的位置变化情况,温度谱尾部上翘的现象。另外,比对了超声风速计和温度脉动仪(即单点和双点温度测量法)测得的C_n^2,发现二者符合较好。

Velocity components and temperature data are measured using 50 Hz three-dimensional ultrasonic anemometer during January 2011.Characteristics of the turbulence spectra are calculated and analyzed under different stability over Hefei area.Comparing with other experiment results,curve fitting formulae,diverse instance of the power spectra peak position and tail raising of temperature spectra were obtained.And,two different refractive index structure parameter C_n^2 were measured and compared by hot wire anemometer and sonic anemometer（double-point and one-point method） above a uniform ground.The results obtained by two methods agree well.