近30年宁波市热环境时空变化分析

Analysis of Spatio-temporal Variation of Thermal Environment of Ningbo City in the Past 30 Years

以热岛效应为体现的热环境是目前最受关注的城市生态环境问题之一。本文以宁波市为研究区,在利用单窗算法计算1987年～2015年间夏季地表温度的基础上,获取近30年热岛时空变化,结果表明:宁波市夏季热岛效应明显,各行政区域内热岛强度空间差异显著;此外,近30年宁波市强热岛和极强热岛面积增加了352.10 km2,年变化率在1997年～2007年达到最大,且城市内部空间分布逐渐从聚集向多个次级热岛分布方向发展。

Heat island effect,an important part of thermal environment,is one of the most attractive problems in urban ecological environment field.In this study,Landsat images of Ningbo city during 1987~2015,were used as experimental data to estimate land surface temperature and heat island intensity.The result indicated that the urban heat island effect was obvious and that the spatial distribution of heat island intensity showed significant differences.In addition,the area of strong heat island and extremely strong heat island added up to 352.10 km2,and the change rate of the strong heat island area and extremely strong heat island area reached the maximum during 1997~2007.The spatial distribution of strong heat island area and extremely strong heat island changed from aggregation to dispersion.