• Journal of Geo-information Science
  • Vol. 22, Issue 6, 1349 (2020)
Xinjie SHEN, Rui ZHAO, Ruizhen HE*, Qi WANG, and Yuchen GUO
Author Affiliations
  • College of Forestry, Henan Agricultural University, Zhengzhou 450000, China
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    DOI: 10.12082/dqxxkx.2020.190231 Cite this Article
    Xinjie SHEN, Rui ZHAO, Ruizhen HE, Qi WANG, Yuchen GUO. Research on Urban Wind Environment Simulation: A Case Study of Zhengzhou Central Area[J]. Journal of Geo-information Science, 2020, 22(6): 1349 Copy Citation Text show less

    Abstract

    Urban wind environment is an important research field of urban climate, which is of great significance to the analysis of urban heat island effect and ventilation. Taking the central area of Zhengzhou city as an example, this paper used meteorological observation data in 1971-2018, the data from ZY-3 satellite in 2016, and then combined with the Open Street Map (OSM) data in 2018 to explore potential ventilation corridors and scientifically quantify the impact of urban form on the wind environment through the combination of meteorology and GIS technology. In this study, the wind environment in urban background was firstly simulated and analyzed with the help of WindNinja software, which improved the accuracy of potential ventilation corridors of the city. The Digital Surface Model (DSM) was made based on the data from ZY-3 satellite in 2016, and then combined with the OSM data in 2018 to calculate the surface roughness of the underlying surface. Then ArcGIS software was used to locate and analyze the location of the potential ventilation corridors in the city by means of the Least Cost Path analysis (LCP). The results were as follows: (1) Average wind speed in Zhengzhou declined slowly with an average rate of 0.26 m/s per decade; The prevailing wind throughout the year was northeast wind, which changed in wind speed and direction after entering the city due to the influence of urban form. In particular, the northeast wind gradually changed to northeast easterly wind in the west of the Beijing-Guangzhou Railway. And the wind speed in the east of the Beijing-Guangzhou Railway was relatively higher than in the west of the Beijing-Guangzhou Railway. (2) The surface roughness of Zhongyuan District, Erqi District, Guancheng District and the western part of Jinshui District was high. The wind speed decreased and the wind direction changed greatly after the prevailing wind entering these study areas, and the overall ventilation environment of those four districts was poor. The surface roughness of the eastern part of Jinshui District and Huiji District was relatively low, with relatively good ventilation conditions. After the prevailing wind entered these areas, the wind speed increased and the wind direction changed less. (3) The common feature of the potential ventilation corridors, which were simulated according to the prevailing wind direction, was that the location tended to be low roughness areas. In these areas, the concentration of ventilation paths was lower and there were more potential ventilation corridors.
    Xinjie SHEN, Rui ZHAO, Ruizhen HE, Qi WANG, Yuchen GUO. Research on Urban Wind Environment Simulation: A Case Study of Zhengzhou Central Area[J]. Journal of Geo-information Science, 2020, 22(6): 1349
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