Study On Seasonal Differences In Factors Of Urban Parks On Urban Heat Island Effect In Wuhan City

Urbanization contributes to regional economic development and accelerates the improvement of people’s overall living standards.As the city expands,urban heat island effect gradually becomes more pronounced,posing a certain threat to the physical and psychological health of residents.How to alleviate the urban heat island effect is an important consideration in urban development and planning.As an important component of urban construction,parks can effectively alleviate the urban heat island phenomenon and improve the environmental quality of cities.The study takes Wuhan as the research area,uses Landsat 8 image data,and inverses the land surface temperature to analyze the current situation of the thermal environment in Wuhan in different seasons.The parks are divided into water-based parks and non-water parks.The average temperature inside the park and the average temperature in the outer-buffer-zone are extracted,studying the impact of urban parks on the urban thermal environment in different seasons.The main research conclusions are as follows:(1)There are significant differences in the intensity and distribution of the urban heat island in different seasons.The heat island intensity in different seasons is ranked from high to low as follows:summer>spring>autumn>winter,and heat island proportion index in each season is 0.21,0.24,0.16,0.12,respectively.The high-temperature heat island areas in different seasons are mainly distributed in densely populated buildings such as East and West Lake Logistics Park,Qingshan District Wugang Industrial Park,Jiangxia Industrial Park,Jianghan District Automobile Industry Park,Jiang’an District Economic Development Zone,and the central urban area.The low-temperature areas are mainly distributed in water bodies and mountains.(2)The average temperature inside the park is negatively correlated with the park area,perimeter,green area,water area,and water area ratio in all seasons,and the correlation with the park shape is not significant.The average temperature inside the park in spring is logarithmically fitted with the park area,green area,and water area,with R~2values of 0.491,0.337,and 0.42,respectively.In summer,the average temperature inside the park is logarithmically fitted to the park’s area,green area,and water area,with R~2values of 0.498,0.348,and 0.35,respectively.(3)The average temperature inside the park is greatly affected by water bodies and green areas.Water-based parks is lower than non-water-based parks in all seasons.Non-water-based parks have a better cooling effect when the green area is between 0-15 hectares,and water-based parks have a more significant cooling effect when the green area reaches 20hectares.For each 0.1 increase in the water area of a water-based park,the average internal temperature decreases by 0.26℃,0.4℃,0.15℃,and 0.11℃in different seasons.(4)The cooling effect of parks on the surrounding environment is more significant in spring and summer.The cooling range and magnitude of parks are positively correlated with water area,water area ratio,forest area,green area,and green area ratio,and significantly negatively correlated with impermeable area ratio.In summer,the cooling distance of parks is logarithmically fitted with park area,green area,and water area,with R~2values of 0.435,0.31,and 0.47,respectively.The cooling magnitude is logarithmically fitted with water area and forest area,with R~2values of 0.48 and 0.47,respectively.(5)The cooling effect of a park on the surrounding environment is greatly influenced by the presence of water bodies,with parks featuring water systems providing better cooling effects than those without.The water surface area is a significant factor that affects the cooling effect of a park,and when the water surface area increases to 20 hectares,the cooling distance of the park reaches around 600 meters,with a temperature reduction of about 3.3℃...