Study On The Influencing Factors Of Urban Parks To Alleviate Heat Island Effect In Hot Summer And Cold Winter Area

In this paper,the influencing factors of cooling effect of urban parks in Chengdu City in hot summer and cold winter area are studied.The characteristic data of parks are extracted from remote sensing images and GIS.Considering the great influence of water body,the parks are manually classified as no water system and water system parks,The average temperature inside the park extracted by ENVI and the average temperature of the buffer zone outside the park are used to describe the cooling effect of the park.The author sums up the impact indicators as follows: 19 indicators of landscape characteristics inside the park,19 indicators of shape characteristics and 19 indicators of external environment characteristics.Through the correlation study with the average temperature inside the park,it is concluded that the cooling effect inside the park is more affected by the characteristics inside the park When the ratio of green area to total area is more than 0.38,the average temperature inside the park is significantly correlated with the park area,and the larger the forest area is,the more favorable it is At the same time,19 indicators were correlated with the cooling range,cooling range and cooling rate outside the park,and the results showed that the cooling effect of the external environment of the park was significantly correlated with the water area,water area ratio,green area,impervious surface area ratio and forest area,among which the water area and green area were significantly positively correlated with the cooling range,impervious surface area ratio and forest area The results show that the water surface area ratio has a significant negative correlation with the cooling range;only when the park area and green space area are relatively small,the external environmental characteristics have a certain impact on the cooling effect of the park;on the whole,the cooling range of Chengdu park is about 0 to 450 meters,and the cooling range is about 0 to 3 ?.The green space index and water index have obvious cooling effect on the park,so it is necessary to design vegetation reasonably At the same time,the larger the green area and water area are,the more obvious the cooling effect is.When the green area reaches about 5 hectares,the cooling effect is close to 2 ?.Therefore,reasonable control of area index and optimal design of Park characteristic index are not only conducive to the cooling effect of the park,but also can optimize the overall design of the park Body design.