摘要:
珠江三角洲城市群是我国经济快速发展的地区,在经济发展的同时,其形成的热岛效应也日益明显.采用热红外遥感方法研究热岛效应,可很直观地了解城市热岛的空间分布状况.基于MODIS影像,运用劈窗算法,对珠江三角洲地区1 a中4季的地表温度(land surface temperature,LST)进行反演;并用不透水面积(impermeable sur-face area,ISA)对城市中心区和郊区进行划分,最终定量获得城市热岛效应的大小.研究结果表明,珠江三角洲地区存在较严重的热岛现象,夏季最为严重,冬季最轻,且城市之间有相互连接形成大片城市热岛效应的趋势;热岛效应的大小与归一化植被指数值成负相关,与城市的经济发展程度成正相关.研究成果可为珠江三角洲地区的城市发展规划提供一定的生态指导.
Abstract:
The Pearl River Delta urban group is a region with rapid economic development;nevertheless, with the economic development, the heat island effect becomes increasingly obvious. Contrast with traditional point surveillance, the thermal infrared remote sensing method can make us understand the spatial distribution of urban heat island more intuitively. In this paper, the authors retrieved the land surface temperature ( LST) of the four seasons of the Pearl River Delta region using the split window algorithm based on MODIS images, and divided the urban core and suburban region based on impermeable surface area(ISA), and finally obtained the surface urban heat island intensity. The results show that the Pearl River Delta region has a serious heat island phenomenon, with the most severe season being summer and the weakest season being winter. There is a tendency that the connection of cities has led to the formation of large urban heat island, especially in the two most serious cities, Foshan and Guangzhou. The heat island intensity is negatively correlated with NDVI value and positively correlated with the degree of the city ' s economic development. The research results would provide some ecological instructions for urban development planning of the Pearl River Delta region.
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