Preprints
https://doi.org/10.5194/gmd-2022-267
https://doi.org/10.5194/gmd-2022-267
Submitted as: development and technical paper
 | 
13 Feb 2023
Submitted as: development and technical paper |  | 13 Feb 2023
Status: a revised version of this preprint is currently under review for the journal GMD.

The development and validation of an Inhomogeneous Wind Scheme for Urban Street

Yuanhao Chen, Zhenxin Liu, Yuhang Wang, Cheng Liu, Shuhua Liu, and Hong Liao

Abstract. The layout of urban buildings shows significant heterogeneity, which leads to the significant spatial inhomogeneity of the wind field in and over the canopy of urban street canyons. However, most of the current urban canopy models do not fully consider the heterogeneity of the urban canopy. Large discrepancies thus exist between the wind speeds simulated by the current urban canopy models and those observed in the street canyon. In this study, a parameterization scheme for wind field, Inhomogeneous Wind Scheme for Urban Street (IWSUS), is developed to better characterize the heterogeneity of the urban canopy. We use a Computational Fuild Dynamics method to generate the IWSUS scheme and compare with observations of wind profile and turbulent flux in and over the street canyon for validation. In IWSUS, the wind speed vertical profiles at six representative positions located in a typical street canyon (i.e., the windward or leeward side of a long straight street, or the inflow or outflow end) are parameterized separately. The wind profile by IWSUS thus can better describe the horizontal heterogeneity of the urban near-surface wind field, e.g., the dynamic drag effect of building in the lower atmosphere layer over the urbanized land use. The validation based on observations shows that the performance of simulation results by IWSUS is better than that by logarithmic-exponential (exp-log) law widely used in the current urban schemes. As we consider typical building arrangement and specific street orientations in IWSUS for wind field simulations, which can better match the distribution characteristics of street canyons around the observation point in the street canyon. The averaged wind profiles and turbulence energy fluxes in the model grids of urban area by IWSUS are also more approach to the observation than those by exp-log law. The normalized mean errors (NME) between the simulated and the observed vertical average wind speed are 49.0 % for IWSUS and 56.1 % for exp-log law in the range from the ground to four times the average height of the building, and 70 % for IWSUS and 285.8 % for exp-log law in the street canyon (range from the ground to building top). This study proves that the accuracy of land surface process and near-grounded meteorological process simulations over urban canopy can be improved by fully considering the heterogeneity of the urban canopy layout structures and the inhomogeneous of wind field distributions in and over the street canyon. The IWSUS is expected to be coupled with mesoscale atmospheric models to improve the accuracy of the wind field, land surface energy budget, meteorological, and atmospheric chemistry simulations.

Yuanhao Chen et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on gmd-2022-267', X.-L. Cheng, 27 Feb 2023
    • AC1: 'Reply on RC1', Zhenxin Liu, 02 Apr 2023
  • CEC1: 'Comment on gmd-2022-267', Astrid Kerkweg, 14 Mar 2023
    • AC2: 'Reply on CEC1', Zhenxin Liu, 02 Apr 2023
  • RC2: 'Comment on gmd-2022-267', Anonymous Referee #2, 16 Apr 2023
    • AC3: 'Reply on RC2', Zhenxin Liu, 25 Apr 2023

Yuanhao Chen et al.

Yuanhao Chen et al.

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Short summary
The heterogenous layout of urban buildings leads to the complex wind field in and over the urban. Large discrepancies exist between the observation and the current simulations without considering the character. The Inhomogeneous Wind Scheme in Urban Street (IWSUS) is developed to simulation the complex wind speed in a typical street. It can better simulate the wind field in and over the inhomogenous street canyon then improve the simulated energy budget in lower atmosphere layer over the urban.