Study on the Construction Path of Ventilation Corridor for Megacity in the Inclined Plain Area along the Yellow River:A Case Study of Zhengzhou City
Scientific construction of ventilation corridors to alleviate climate issues such as poor urban ventilation and heat island effect has become a hot topic in research and practice in the industry. The inclined plain area exhibits unique characteristics in terms of wind environment within the urban canopy. Taking Zhengzhou,a megacity in the Yellow River basin,as an example,this paper explores the construction path and method of urban ventilation corridors that adapt to the region's specific geographical features through multidisciplinary integration of meteorology,urban and rural planning and other disciplines,at both regional and urban spatial scales. First,at the regional scale,a comprehensive background wind environment assessment is conducted based on long-term (exceeding 30 years) meteorological observation data and the WRF model to determine the wind source. Second,at the urban scale,the focus is on the influence of circulation on the urban wind environment under the inclined plain terrain topography. The sky view factor (SVF) and the surface roughness index superposition model are used to identify and calculate the ventilation potential. This paper combines GIS visual evaluation to define the spatial boundaries of primary and secondary corridors and scientific validation of the ventilation effectiveness is carried out. Finally,the study connects with the three types of territorial planning system to explore hierarchical and classified management of ventilation corridors and cold source as core spatial elements,and to promote spatial positioning and precise implementation. By enriching the theory and technical support for ventilation corridor,the study provides guidance and reference from the perspective of meteorology and planning integration for the ecological protection and high-quality development of megacities along the Yellow River basin in China.
along the Yellow River basininclined plainurban ventilation corridorconstruction path
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