URBAN PLANNING STRATEGIES FOR HAZE MITIGATION IN WINTER CITIES:QUANTITATIVE RESEARCH BASED ON THREE-DIMENSIONAL LANDSCAPE
Urban haze pollution is becoming increasingly prominent,particularly during the heating seasons in winter cities.This issue is usually closely related to a city's three-dimensional form,pollution sources,traffic patterns,and meteorological conditions.This paper focuses on the spatial distribution characteristics of three kinds of particulate matter in winter cities and explores the mechanisms influencing their distribution and diffusion,as well as potential planning strategies.The particulate matter concentration on typical trunk roads within the Fourth Ring Road of Shenyang was monitored,and the three-dimensional urban landscape environment was measured using the ArcGIS platform and street view imagery.Machine learning and the structural equation model were used to analyze the relationship between particulate matter concentration and the four elements:meteorology,traffic,three-dimensional landscape,and pollution sources.The results show that meteorological factors,such as temperature and humidity,have the greatest influence on particulate matter pollution.Additionally,three-dimensional landscape factors,such as green visibility and sky openness,are also significant contributing factors.The control strategies include appropriately increasing the aspect ratio of streets,improving the interface enclosure degree,optimizing sky openness to about 0.5,and constructing urban ventilation corridors.These measures aim to reduce the accumulation and deposition of pollutants.
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