城市绿地对热岛效应的缓解作用研究——以台州市为例

Heat Island Effect Mitigation by Urban Green Space System: A Case Study of Taizhou City

为了明确城市绿地及其组合对城市热环境的影响,采用实地调查与遥感相结合的方法获取了绿地类型和地表温度等相关数据,并应用统计分析方法对不同绿地类型及其组合的降温效应进行了研究。结果显示:(1)树林和混合绿地的降温效果明显好于草坪和裸地,但更易受到其周围一定范围内绿地分布的影响;(2)不同城市功能区内各绿地类型的降温效应存在明显差异;(3)降低光照强度和增加空气湿度可能是降温的主要机制之一。研究结果对于深入了解绿地类型的降温特征、指导城市绿地规划建设以及定量评价城市绿地建设均可提供技术支撑和科学参考。

In order to clarify the impact of urban green space types and their combination on urban thermal environment, the relevant data including green space types and land surface temperature are acquired by field survey and remote sensing, and the cooling effects of green space types and their combination are analyzed using statistical method in this study. The results show that： （1） the cooling effects of woods and mixed green spaces outperform that of grassland and bare land, but they are more susceptible to a range of surrounding distribution of green spaces; （2） the cooling effects of various green space types have significant difference in the different urban functional areas; and （3） to reduce light intensity and increase air humidity may be one of the main mechanisms for cooling. Those results can provide technical support and scientific reference to understand the cooling effect of different types of green space, guide and quantitatively evaluate the planning and construction of urban green space system.