[1]梁 志,师 宇,丁伟宸,等.山地地形下激光雷达风速的精度验证与模拟[J].山地学报,2022,(2):317-328.[doi:10.16089/j.cnki.1008-2786.000674]
　LIANG Zhi,SHI Yu,DING Weichen,et al.Verification of LiDAR Accuracy and Wind Simulation under Mountainous Terrain[J].Mountain Research,2022,(2):317-328.[doi:10.16089/j.cnki.1008-2786.000674]
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山地地形下激光雷达风速的精度验证与模拟
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2022年第2期
页码:
317-328
栏目:
山地技术
出版日期:
2022-03-25

文章信息/Info

Title:
Verification of LiDAR Accuracy and Wind Simulation under Mountainous Terrain
文章编号:
1008-2786-(2022)2-317-12
作者:
梁 志1; 2; 师 宇1; 丁伟宸1; 2; 胡 非1; 2*
1.中国科学院大气物理研究所,北京 100029; 2.中国科学院大学,北京 100049
Author(s):
LIANG Zhi1; 2; SHI Yu1; DING Weichen1; 2;  HU Fei1; 2*
1. Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China
关键词:
激光雷达;  山地地形;  精度验证;  计算流体力学
Keywords:
LiDAR;  mountainous terrain;  accuracy verification;  Computational Fluid Dynamics(CFD)
分类号:
P412.16; O355
DOI:
10.16089/j.cnki.1008-2786.000674
文献标志码:
A
摘要:
山地地形的边界层风场与平坦地形有显著不同,其空间分布具有独特的特征。山地地形下风场的精细测量对气象预报、风能利用和环境保护等相关领域均非常重要。激光雷达因可移动和便捷性在山地地形下广泛使用,但山地复杂的风场状况会降低激光雷达对风速的测量精度。本文选取风速加速显著的山脊地形作为观测场地,评估了激光雷达在山地地形的风速测量误差,提出了基于计算流体力学数值模拟的风速误差评估方法,解释了地形对风速误差的产生机制。结果表明:(1)激光雷达实测的风速误差随着地形变化呈现显著对应的规律变化,地形坡度最大时误差达到最大值,激光雷达对风速有17.8%的低估;(2)不同激光束的结果表明风速低估是由于风场在空间上的差异造成的;(3)数值模拟的评估结果与实际观测结论一致,山地地形造成了风场的空间差异,通过激光雷达的风速反演算法产生计算误差。本文结论可以指导激光雷达在山地地形下的正确使用,对山地地形下激光雷达的风速误差修正有很好的参考价值。
Abstract:
In mountainous terrain, the spatial distributions of wind flow in Atmospheric Boundary Layer(ABL)are significantly distinct from those of wind flow in flat terrain. Accurate wind measurement in mountainous terrain is playing a crucial role in wind-related disciplines, such as meteorological forecasting, wind energy and environmental protection. In recent years, LiDAR(Light Detection and Ranging)has become an important tool for wind measurement in mountainous terrain due to their great benefits in mobility and flexibility. However, the accuracy of LiDAR is compromised due to the complexity of wind flow in mountainous terrain. In this study, one ridge was selected as our targeted test site for its significant wind acceleration effect, and LiDAR error of wind speed measurement was analyzed under different terrains. One method to evaluating LiDAR error by the numerical simulation of Computational Fluid Dynamics(CFD)was proposed and demonstrated a possible mechanism of how the error was generated by the terrain. The results showed:(1)The LiDAR error of wind speed showed a significant correlation with the slope of the terrain and it reached a maximum when the terrain slope was the largest, with a 17.8% underestimation of the wind speed;(2)The analysis of RWS(Radial Wind Speed)at different laser beams showed that wind speed underestimation was due to spatial differences in wind fields;(3)The distribution pattern of LiDAR error assessed by CFD numerical simulation was consistent with the observation result, and the numerical simulation indicated that the mountainous terrain caused spatial differences of the wind field, and the error was generated by LiDAR Wind Field Reconstruction(WFR). The conclusion of this paper could guide the proper use of LiDAR in mountainous terrain, and was a valuable reference for LiDAR error correction of wind speed.

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备注/Memo

备注/Memo:
收稿日期(Received date):2022-01-29; 改回日期( Accepted date):2022-04-06
基金项目(Foundation item):国家自然科学基金青年项目(42105093); 国家自然科学基金(41975018)。[National Natural Science Foundation of China(Grant 42105093); National Natural Science Foundation of China(Grant 41975018)]
作者简介(Biography):梁志(1985-),男,博士研究生,主要研究方向:复杂地形边界层结构和湍流理论。[LIANG Zhi(1985-), male, Ph.D. candidate, research on boundary layer structure on complex terrain and turbulence theory] E-mail: li-angzhi18@mails.ucas.ac.cn
*通讯作者(Corresponding author):胡非(1962-),男,博士,研究员,主要研究方向:大气边界层湍流。[HU Fei(1962-), male, Ph.D., professor, research on atmospheric boundary layer turbulence] E-mail: hufei@mail.iap.ac.cn
更新日期/Last Update: 2022-03-30