Observed turbulence characteristics in unstable conditions over the city of Tehran based on similarity theory

Pegahfar, Nafiseh; Zawar-Reza, Peyman

doi:10.1007/s00703-016-0482-9

Cited by 4 publications

(3 citation statements)

References 80 publications

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“…Because of the lack of horizontally and vertically uniform flux density and constant flux conditions, the MOST cannot be directly applied in the RSL and ML 13 . The local scale approach provides a solution to this issue 14 so that the log‐law has been widely applied to study wind speed profiles and obtain surface roughness parameters in the UBL based on the framework of the MOST 15–18 …”

Section: Introductionmentioning

confidence: 99%

“…13 The local scale approach provides a solution to this issue 14 so that the log-law has been widely applied to study wind speed profiles and obtain surface roughness parameters in the UBL based on the framework of the MOST. [15][16][17][18] The 325-m-tall Beijing Meteorological Tower (BMT) is a convenient facility for studying the atmospheric boundary layer and pollution diffusion in the urban city, which has attracted widespread attention from scholars. In previous studies, based on the measured data from the BMT, researchers analyzed the characteristics of the UBL in Beijing, including the surface roughness, 19 vertical turbulent transfer, 20 vertical mean wind speed and turbulence profiles, 21 thunderstorm outflows, 22 wind speed spectra, 23,24 and so forth.…”

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confidence: 99%

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Investigation of the vertically‐layered structure and surface roughness parameters of the urban boundary layer

Li,

Han,

Zhang

et al. 2023

Structural Design Tall Build

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SummaryAtmospheric flow is the main factor affecting the wind load of urban buildings. The measured data observed continuously from the 325‐m‐tall Beijing Meteorological Tower (BMT) during 2013–2017 is employed to investigate the vertically‐layered structure and surface roughness parameters of the urban boundary layer. Based on the local similarity theory and analysis results of the atmospheric stability and local friction velocity, it can be determined that the height of 80 m is near the bottom of the inertial sub‐layer, the range below this height belongs to the roughness sub‐layer, 140 m belongs to the inertial sub‐layer, and 200 m and 280 m are in the mixing layer. The local friction velocity at 80 m can be considered a relatively reliable value as the friction velocity. Moreover, seasonal effect on local friction velocity is minimal. According to the fitting result of near‐neutral strong wind samples by the log‐law, it is concluded that to obtain a more accurate wind speed profile, all layers should be included when picking fitting heights. In addition, surface roughness parameters are affected by the wind direction and speed. The variation according to the wind direction corresponds to the topographical distribution surrounding the BMT, and the higher range of wind speed may be more applicable for estimating surface roughness parameters.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Investigation of the vertically‐layered structure and surface roughness parameters of the urban boundary layer

Li,

Han,

Zhang

et al. 2023

Structural Design Tall Build

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“…For example, vertical wind velocity data from SODAR measurements were compared against both in‐situ (e.g. Thomas and Vogt, ; Ito, ; Pegahfar and Zawar‐Reza, ) and remote sensing instruments (e.g. Bradley et al ., ).…”

Section: Introductionmentioning

confidence: 99%

Quality and applications of wind data from sound detection and ranging (SODAR) equipment and microwave wind profilers

Chan

Chiu

2018

Weather

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The quality and applications of vertical velocity data from SODAR and radar wind profilers are examined in this paper. The vertical velocity data from collocated SODAR and boundary layer type wind profilers are compared for a period of 7 months. It is found that the two datasets are well correlated, but the slope of the linear fit to the data has a significant deviation from 1. This may be related to the difference in the sampling volumes of the vertical beams from the two instruments. The correlation for horizontal wind data was found to be much stronger. Three applications of the vertical velocity data are discussed: subsidence in the outer periphery of a tropical cyclone and in hazy weather, and the upward motion of the air in convective weather. Data such as those under study here are found to contribute significantly to the monitoring and understanding of weather conditions, and would be useful for the nowcasting of lowvisibility and convective weather.

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Characteristics and similarity relations of turbulence dispersion parameters under heavy haze conditions

Liu

Shi

2021

Atmospheric Pollution Research

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Observed turbulence characteristics in unstable conditions over the city of Tehran based on similarity theory

Cited by 4 publications

References 80 publications

Investigation of the vertically‐layered structure and surface roughness parameters of the urban boundary layer

Investigation of the vertically‐layered structure and surface roughness parameters of the urban boundary layer

Quality and applications of wind data from sound detection and ranging (SODAR) equipment and microwave wind profilers

Characteristics and similarity relations of turbulence dispersion parameters under heavy haze conditions

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