基于Landsat-8遥感影像的扬州市城市公园夏季温湿效应

Summer Temperature-Humidity Effects of Urban Parks in Yangzhou City in Summer Based on Landsat-8 Remote Sensing Images

基于GEE平台Landsat-8 OLI遥感影像,采用改进的辐射传输方程法,反演扬州市区33个城市公园的地表温度、湿度数据,分析公园空间构成指标与温湿效应的量化关系,以期为同类地区城市公园的规划设计提供理论与数据支撑。结果表明:1)降温增湿幅度与公园面积、周长呈显著对数正相关,与形状指数呈显著对数负相关。2)城市公园降温增湿效率存在阈值,其中对应的面积阈值分别为18~20 hm^(2)与9~10 hm^(2),对应的周长阈值分别为2.90~3.00 km与1.90~2.00 km;面积相近、公园形状越接近圆形,降温增湿效率越大。3)公园温湿效应与其内部绿地、水体面积呈显著对数正相关,与不透水面面积呈显著对数负相关。4)公园温湿效应影响的距离与公园规模呈显著非线性正相关,公园外240~270 m范围,温湿度变化明显;270 m以外,趋于稳定。

Based on Landsat-8 OLI remote sensing images on the GEE platform,an improved Radiative Transfer Equation method is used to invert surface temperature and humidity data of 33 urban parks in Yangzhou city,and the quantitative relationship between park spatial composition indicators and temperature-humidity effects is analyzed,in order to provide theoretical and data support for the planning and design of urban parks in similar regions.The results show:1) The amplitude of cooling and humidification is significantly positively correlated with the park area and perimeter,and significantly negatively correlated with the shape index;2) There are thresholds for the cooling and humidifying efficiency of urban parks.The corresponding area thresholds are 18-20 hm^(2) and 9-10 hm^(2),respectively,while the corresponding perimeter thresholds are 2.90-3.00 km and 1.90-2.00 km,respectively.The closer the area is and the more similar the parks are to a circular shape,the greater the cooling and humidifying efficiency is;3) The temperature-humidity effect of parks is significantly positively correlated with its internal green spaces and water area,and negatively correlated with the impervious water surface area;and 4) The distance affected by the temperature-humidity effect of parks is significantly non-linearly and positively correlated with the park size.Within a range of 240-270 m outside the park,there are significant changes in temperature and humidity,while beyond 270 m,the temperature and the humidity tend to stabilize.