基于GWR的特大山地城市热力景观及其影响因素研究——以重庆市南岸区为例

Research on Urban Thermal Landscape and Its Influencing Factors in Nan′an District of Chongqing City based on GWR Model

以重庆市南岸区为例,基于TM遥感影像反演的地表温度数据,提出以等温斑块为研究载体的城市热环境中的热力景观格局及与自然因素的关系研究方法,以期为城市热环境的相关研究提供一种思路。结果表明:南岸区共形成2204块热力图斑,热力斑块平均面积为0.12 km^(2),平均周长为3.33 km,地表温度高值区域热力等级由中心向外递减,地表温度低值区域热力等级由外向内递增;南岸区热力景观在数量、形状与结构上的表征指数在空间上具有正相关关系,且高值与低值聚集现象明显,PD、LSI指数的聚集情况较为一致,AI指数的高值与低值聚集区域与PD、LSI在空间上呈现相反态势;基于GWR的拟合结果表明,在绿度越低、湿度越小、越为平坦的区域热力景观越为密集,在绿度越高、湿度越大、越为平坦及干度越大的区域热力景观形状越为复杂,在绿度越低、湿度越小、越为平坦及干度越大的区域热力景观分布越集中。研究结果为改善城市热环境以及提高城市居住适宜度提供依据,也对等温斑块应用于城市热环境热力景观格局进行探索,为以后类似研究提供参考。

Taking the Nan′an District of Chongqing as an example,based on the surface temperature data retrieved from TM remote sensing images,a research method on the thermal landscape pattern and the relationship with natural factors in the urban thermal environment using isothermal patches as the research carrier is proposed,with a view to the city Related research on thermal environment provides an idea.The results show that there are 2204 thermal patches formed in the Nan′an District.The average area of thermal patches is 0.12 km^(2)and the average circumference is 3.33 km.The thermal grade of areas with high surface temperature decreases from the center to the outside,and the thermal grade of areas with low surface temperature Increasing from the outside to the inside;the number,shape,and structure of the thermal landscape in the South Bank area have a positive correlation in space,and the aggregation of high and low values is obvious.The aggregation of PD and LSI indexes is relatively consistent.AI index The high-value and low-value clustering areas of,and PD and LSI are in the opposite spatial situation;the fitting results based on GER show that the thermal landscape is denser in areas with lower greenness,lower humidity,and flatter areas.The higher the degree,the higher the humidity,the more flat and the greater the dryness of the area,the more complex the shape of the thermal landscape,the more concentrated the thermal landscape is in the area with lower greenness,lower humidity,flatter and greater dryness.The research results provide a basis for improving the urban thermal environment and the suitability of urban living.It also explores the application of isothermal patches to the thermal landscape pattern of the urban thermal environment,and provides references for similar studies in the future.