scholarly journals Detection of structures in the horizontal wind field over complex terrain using coplanar Doppler lidar scans

2020 ◽  
Vol 29 (6) ◽  
pp. 467-481
Author(s):  
Bianca Adler ◽  
Norbert Kalthoff ◽  
Olga Kiseleva
Keyword(s):  
Wind Field ◽  
Complex Terrain ◽  
Horizontal Wind ◽  
Doppler Lidar

scholarly journals Detection of Complex Terrain-Induced Wind Shear by Doppler Lidar at Beijing Capital International Airport

2020 ◽  
Vol 237 ◽  
pp. 06004
Author(s):  
Xiaoying Liu ◽  
Songhua Wu ◽  
Hongwei Zhang ◽  
Jianjun Zhang ◽  
Zhiqiang He ◽  
...  
Keyword(s):  
Wind Field ◽  
Complex Terrain ◽  
Wind Shear ◽  
Field Structure ◽  
Shielding Effect ◽  
Doppler Lidar ◽  
Wake Effect ◽  
International Airport ◽  
Glide Path ◽  
Coherent Doppler Lidar

In November 2018, the lidar-based wind shear synchronous experiment was performed at Beijing Capital International Airport (BCIA). In this experiment, aiming at the measurement of the terrain-induced wind shear and the wind field around the runway, the glide path scanning mode, and the RHI strategy were conducted alternately. Radial velocity retrieved from the glide path scanning can obviously present the wakes caused by complex terrain (e.g., hills, tall trees, residential and terminal buildings). The Pulse Coherent Doppler Lidar (PCDL) warned the terrain-induced wind shear, which was verified by the pilot report. The wind field structure around the runway under the wake effect and the building shielding effect is also analyzed.

Simulation of the wind fields over complex terrain with coupling of CFD and WRF

2021 ◽  
pp. 1-12
Author(s):  
Xiaoyu Luo ◽  
Yiwen Cao
Keyword(s):  
Wind Speed ◽  
Wind Field ◽  
Complex Terrain ◽  
Civil Engineering ◽  
Meteorological Data ◽  
Mass Conservation ◽  
Coupling Method ◽  
Wind Fields ◽  
Civil Structures ◽  
Civil Engineers

In the field of civil engineering, the meteorological data available usually do not have the detailed information of the wind near a certain site. However, the detailed information of the wind field during typhoon is important for the wind-resistant design of civil structures. Furthermore, the resolution of the meteorological data available by the civil engineers is too coarse to be applicable. Therefore it is meaningful to obtain the detailed information of the wind fields based on the meteorological data provided by the meteorological department. Therefore, in the present study, a one-way coupling method between WRF and CFD is adopted and a method to keep the mass conservation during the simulation in CFD is proposed. It is found that using the proposed one-way coupling method, the predicted wind speed is closer to the measurement. And the curvature of the wind streamline during typhoon is successfully reproduced.

Influence of the diagnostic wind field model on the results of calculation of the microscale atmospheric dispersion in moderately complex terrain

2013 ◽  
Vol 79 ◽  
pp. 29-35 ◽  
Author(s):  
Ivan V. Kovalets ◽  
Vladimir Y. Korolevych ◽  
Alexander V. Khalchenkov ◽  
Ievgen A. Ievdin ◽  
Mark J. Zheleznyak ◽  
...  
Keyword(s):  
Wind Field ◽  
Complex Terrain ◽  
Field Model ◽  
Atmospheric Dispersion ◽  
Wind Field Model

scholarly journals Regional wind-field study in complex terrain during summer sea-breeze conditions

1979 ◽  
Author(s):  
W.M. Porch ◽  
P.A. Volker ◽  
K.R. Peterson ◽  
R.L. Weichel ◽  
C. Sherman
Keyword(s):  
Field Study ◽  
Wind Field ◽  
Complex Terrain ◽  
Sea Breeze

scholarly journals Analyzing the basic meteorological aspects of a particulate air pollution episode over the industrial area of Northwestern Greece during the November of 2009

2013 ◽  
Vol 15 (2) ◽  
pp. 241-253 ◽  
Keyword(s):  
Air Pollution ◽  
Particulate Matter ◽  
Wind Field ◽  
Lower Troposphere ◽  
Airborne Particulate Matter ◽  
Radical Change ◽  
Industrial Area ◽  
Lower Atmosphere ◽  
Horizontal Wind ◽  
Pollution Episode

The complex terrain basin of Amyntaio – Ptolemais – Kozani in Western Macedonia of Greece is an area characterized by increased industrial activity and therefore it demands continuous and assiduous environmental monitoring. A prolonged particulate matter air pollution episode was recorded in the area during November 2009. Basic meteorological aspects are analyzed, during the episode period. Daily and hourly PM10 and PM2.5 concentration measurements were used along with surface and lower atmosphere hourly meteorological parameters from 13 measuring stations. The observational data were supported by data produced by the meteorological component of an air pollution model. The overall analysis showed that the episode was primarily the result of the synoptic setting of the middle and lower troposphere. An Omega blocking pattern which gradually transformed to a high-over-low pattern prevailed over central and southern Europe during the episode’s period. The examination of the vertical wind field in the lower troposphere and appropriate stability indices, revealed a continuous absence of significant convection. The weak horizontal wind field near the surface and the reduced mixing height combined with the lack of synoptic forcing resulted in the trapping of the pollutants in the lower troposphere and the recording of increased airborne particulate matter concentrations. The radical change of the synoptic setting in the first days of December marked the end of the episode.

Wind-Field Vector Retrieval Method at Low Signal-to-Noise Ratio for Coherent Doppler Lidar

2018 ◽  
Vol 45 (11) ◽  
pp. 1110005
Author(s):  
赵萌 Zhao Meng ◽  
郭磐 Guo Pan ◽  
芮训豹 Rui Xunbao ◽  
陈思颖 Chen Siying ◽  
张寅超 Zhang Yinchao ◽  
...  
Keyword(s):  
Wind Field ◽  
Signal To Noise Ratio ◽  
Field Vector ◽  
Doppler Lidar ◽  
Signal To Noise ◽  
Retrieval Method ◽  
Coherent Doppler Lidar ◽  
Noise Ratio ◽  
Vector Retrieval

Analysis of wind field measurement results of Doppler lidar

2012 ◽  
Vol 24 (9) ◽  
pp. 2037-2042
Author(s):  
唐磊 Tang Lei ◽  
董吉辉 Dong Jihui ◽  
吴海滨 Wu Haibin
Keyword(s):  
Field Measurement ◽  
Wind Field ◽  
Doppler Lidar ◽  
Measurement Results

scholarly journals A Study on Microscale Wind Simulations with a Coupled WRF–CFD Model in the Chongli Mountain Region of Hebei Province, China

Atmosphere ◽  
2019 ◽  
Vol 10 (12) ◽  
pp. 731
Author(s):  
Shaohui Li ◽  
Xuejin Sun ◽  
Shan Zhang ◽  
Shijun Zhao ◽  
Riwei Zhang
Keyword(s):  
Wind Field ◽  
Complex Terrain ◽  
Wrf Model ◽  
Mountain Region ◽  
Weather Research And Forecasting ◽  
Cfd Model ◽  
Improved Method ◽  
Comprehensive Understanding ◽  
Cfd Models ◽  
Computational Fluid Dynamics Cfd

To ensure successful hosting of the 2022 Olympic Winter Games, a comprehensive understanding of the wind field characteristics in the Chongli Mountain region is essential. The purpose of this research was to accurately simulate the microscale wind in the Chongli Mountain region. Coupling the Weather Research and Forecasting (WRF) model with a computational fluid dynamics (CFD) model is a method for simulating the microscale wind field over complex terrain. The performance of the WRF-CFD model in the Chongli Mountain region was enhanced from two aspects. First, as WRF offers multiple physical schemes, a sensitivity analysis was performed to evaluate which scheme provided the best boundary condition for CFD. Second, to solve the problem of terrain differences between the WRF and CFD models, an improved method capable of coupling these two models is proposed. The results show that these improvements can enhance the performance of the WRF-CFD model and produce a more accurate microscale simulation of the wind field in the Chongli Mountain region.

scholarly journals A Simulation Experiment to Retrieve the Atmospheric Density and Three-Dimensional Wind Field by Double Falling Spheres

Atmosphere ◽  
2020 ◽  
Vol 11 (12) ◽  
pp. 1312
Author(s):  
Yue Wu ◽  
Zheng Sheng ◽  
Xinjie Zuo ◽  
Minghao Yang
Keyword(s):  
Wind Field ◽  
Simulation Experiment ◽  
Middle Atmosphere ◽  
Three Dimensional ◽  
Optimal Solution ◽  
Vertical Wind ◽  
Horizontal Wind ◽  
Atmospheric Density ◽  
Falling Sphere ◽  
Falling Spheres

Falling-sphere sounding remains an important method for in situ determination in the middle atmosphere and is the only determination method within the altitude range of 60–100 km. Traditional single-falling-sphere sounding indicates only the atmospheric density and horizontal wind but not the vertical wind; the fundamental reason is that the equation set for retrieving atmospheric parameters is underdetermined. For tractability, previous studies assumed the vertical wind, which is much smaller than the horizontal wind, to be small or zero. Obtaining vertical wind profiles necessitates making the equations positive definite or overdetermined. An overdetermined equation set consisting of six equations, by which the optimal solution of density and three-dimensional wind can be obtained, can be established by the double-falling-sphere method. Hence, a simulation experiment is designed to retrieve the atmospheric density and three-dimensional wind field by double falling spheres. In the inversion results of the simulation experiment, the retrieved density is consistent with the constructed atmospheric density in magnitude; the density deviation rate does not generally exceed 20% (less than 5% below 60 km). The atmospheric density retrieved by the double-falling-sphere method is more accurate at low altitudes than the single-falling-sphere method. The vertical wind below 50 km and horizontal wind retrieved by double-falling-sphere method is highly consistent with the constructed average wind field. Additionally, the wind field deviation formula is deduced. These results establish the fact that the double-falling-sphere method is effective in detecting atmospheric density and three-dimensional wind.

Sign in / Sign up

Export Citation Format

Share Document