生态环境学报Issue(10)：1622-1627,6.
道路建设对成都市热岛效应的影响
The Effect of Road Construction on Urban Heat Island Effect in Chengdu
摘要
Abstract
The heat island effect is often one of the most evident characteristics of urban climates. Land use/cover changes such as urbanization and road building, are some of the most important factors that induce heat islands. Road properties, including road density and road type, may determine the magnitude of urban heat islands, but such effects have not previously been explored. In this study, we evaluated the effect of road density and the contribution of different road types on urban heat islands using multi-time (winter and summer) Modis data and city transportation maps with 3S technology. The results showed that: (1) The urban heat island effect in Chengdu was very apparent and of high intensity in summer (3~4℃) but weak in winter (2.5~3℃). During daytime, there was a polycentric pattern of heat island, and the central of heat island varied between summer and winter. In summer, the areas with the highest land surface temperature (32.66℃) was in the southwest and the central northeast part of the city. In winter, the land surface temperature in the southwest section of the city and at the city boundary was higher, oftern over 16℃. At night, there was a ring distribution pattern of the urban heat island both in summer and winter, and the land surface temperature decreased from the central of the city to the suburbs. The difference of the land surface temperature between the city and suburbs was 4.37℃ in summer and 2.82℃ in winter;(2)The road system in Chengdu showed a “ring and radiative” distribution pattern, and road density was closely related to the road distribution. The road density in the south and southwest part of the city was higher than that in the northern part;(3)Both in winter and summer, the land surface temperature was significantly correlated with road density, and the coefficient correlation was higher at night (r=0.5) than that in daytime. Thermal contribution index, thermal unit weight index and thermal unit weight index indicated that the third-class roads contributed the most to the urban heat island effect (>95%), much greater than secondary road (45%~80%). These results are expected to provide critical information for decision makers and land managers for management of urbanization and road building, which may mitigate the urban heat island effect.关键词
城市热岛效应/道路密度/热贡献/Modis/热岛强度Key words
urban heat island effect/road density/thermal contrubution/Modis/heat island intensity分类
资源环境引用本文复制引用
曾胜兰..道路建设对成都市热岛效应的影响[J].生态环境学报,2014,(10):1622-1627,6.基金项目
四川省教育厅科研项目（13ZB0075）；高原大气与环境四川省重点实验室开放课题 （）
