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梁志, 刘磊, 师宇, 等. 2023. 山地地形对激光雷达湍流测量精度的影响[J]. 气候与环境研究, 28(2): 207−215. doi: 10.3878/j.issn.1006-9585.2022.22025
引用本文: 梁志, 刘磊, 师宇, 等. 2023. 山地地形对激光雷达湍流测量精度的影响[J]. 气候与环境研究, 28(2): 207−215. doi: 10.3878/j.issn.1006-9585.2022.22025
LIANG Zhi, LIU Lei, SHI Yu, et al. 2023. Mountain Terrain Effects on Lidar Accuracy for Turbulence Measurement [J]. Climatic and Environmental Research (in Chinese), 28 (2): 207−215. doi: 10.3878/j.issn.1006-9585.2022.22025
Citation: LIANG Zhi, LIU Lei, SHI Yu, et al. 2023. Mountain Terrain Effects on Lidar Accuracy for Turbulence Measurement [J]. Climatic and Environmental Research (in Chinese), 28 (2): 207−215. doi: 10.3878/j.issn.1006-9585.2022.22025

山地地形对激光雷达湍流测量精度的影响

Mountain Terrain Effects on Lidar Accuracy for Turbulence Measurement

  • 摘要: 针对平坦地形和山地地形,通过两次外场测量,研究了激光雷达在湍流测量的精度,并分析讨论了误差的可能来源。结果表明,在平坦地形下,激光雷达与测风塔在风速、湍流动能、湍流强度的相关系数分别为0.995、0.908、0.904,拟合结果分别为y=1.003x+0.241、y=1.192x+0.091、y=1.140x+0.006;在山地地形下,二者的相关系数分别为0.999、0.917、0.900,拟合结果分别为y=0.949x+0.119、y=1.606x+0.167、y=1.131x+0.031。在平坦地形下,激光雷达高估风速2.71%,高估湍流动能28.3%,高估湍流强度17%;在山地地形下,激光雷达低估风速3.91%,高估湍流动能77.3%,高估湍流强度17.85%。本文采用了IEC61400-50-3标准中建议的方法验证了激光光束的湍流测量,激光束对湍流测量精度较高,湍流强度的相关系数为0.93,拟合公式为y=1.003x−0.003。山地地形对于激光雷达风速、湍流均有影响,高估湍流动能和湍流强度,低估风速。

     

    Abstract: Lidar turbulence measurement in flat terrain and in mountainous terrain are compared, and the error source is discussed. The field data show that the correlation coefficients for wind speed, turbulence kinetic energy (TKE), and turbulence intensity (TI) are 0.995, 0.908, and 0.904; in flat terrain, respectively, 0.999, 0.917, and 0.900; the fitting results in flat terrain are y=1.003x+0.241, y=1.192x+0.091, and y=1.140x+0.006; the fitting results in mountain terrain are y=0.949x+0.119, y=1.606x+0.167, and y=1.131x+0.031. In flat terrain, lidar overestimates wind speed by 2.71%, TKE by 28.3%, and TI by 17%; in mountain terrain, lidar underestimates wind speed by 3.91%, TKE is overestimated by 77.3%, and TI is overestimated by 17.85%. In the line of sight of a laser beam, the correlation coefficient of lidar TI is 0.93, and the fitting formula is y=1.003x−0.003. The results of this paper show that mountain terrain has an effect on lidar measurement of wind speed and turbulence: Lidar overestimated the TKE and TI, while underestimated the wind speed.

     

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