摘要
为了探究广汉机场上空边界层高度的变化特征,利用多普勒激光雷达的载噪比数据,采用梯度法、小波协方差法和标准方差法,对机场上空的边界层高度进行了反演,并与L波段探空和飞机探测数据进行了对比,利用飞机探测数据和探空仪数据对激光雷达反演的边界层高度进行了验证。结果表明,在对流边界层顶的识别上,3种方法都能较好地捕获边界层信息,且一致性较好,但在对残余层顶和稳定边界层顶的识别上,梯度法无论是准确性、连续性还是稳定性上都表现出了明显优势;反演得到的对流边界层和残余层高度维持在2000 m左右,稳定边界层高度在100 m~200 m之间;受边界层内湍流的影响,物质边界层高度与热力边界层高度在某些时段会出现显著差异。该研究可为飞行训练提供预警信息,更好地保障飞行安全。
In order to explore the height variation characteristics of the boundary layer over Guanghan Airport,the carrier noise ratio data of Doppler light detection and ranging(LiDAR)was used to invert the boundary layer height over the airport by gradient method,wavelet covariance method,and standard variance method.The calculated data through these methods was then compared with that of the L-band sounding and aircraft detection data.The results show that boundary layer information can be captured well by these methods,and good consistency in the recognition of convective boundary pause can be observed.However,the gradient method shows obvious advantages in accuracy,continuity and stability in the recognition of residual layer pause and stable boundary top layer.During the observation period,the height of the convective boundary layer and the residual layer is about 2000 m,and the height of the stable boundary layer is between 100 m~200 m.The boundary layer height of LiDAR inversion was verified by aircraft detection data and sonde data.Due to the turbulence in the boundary layer,the material boundary layer and the thermal boundary layer were significantly different at certain times.The study can provide early warning information for flight training and better ensure flight safety.
作者
吴俊杰
王耀辉
徐足音
任佳莉
张博义
WU Junjie;WANG Yaohui;XU Zuyin;REN Jiali;ZHANG Boyi(College of Aeronautical Meteorology,Civil Aviation Flight University of China,Deyang 618300,China;Sichuan Provincial Key Laboratory of Civil Aircraft Fire Science and Safety Engineering,Civil Aviation Flight University of China,Deyang 618300,China;Air Traffic Management Academy,Civil Aviation Flight University of China,Deyang 618300,China;Beijing Levisel Technology Co.Ltd.,Beijing 101318,China)
出处
《激光技术》
CAS
CSCD
北大核心
2023年第6期778-785,共8页
Laser Technology
基金
国家重点研发计划资助项目(2021YFB2601701-01)
中国民用航空飞行学院民航飞行技术与飞行安全重点实验室基金资助项目(FZ2020ZZ03)
中国民用航空飞行学院科研基地资助项目(F2018KF05)。
关键词
激光技术
激光雷达
边界层高度
载噪比
laser technique
light detection and ranging
boundary layer height
carrier-to-noise ratio
