测绘与空间地理信息
測繪與空間地理信息
측회여공간지리신식
GEOMATICS & SPATIAL INFORMATION TECHNOLOGY
2015年
1期
13-19
,共7页
城市热岛效应%热红外遥感%转移矩阵%时-空动态演变%成都平原%中等城市
城市熱島效應%熱紅外遙感%轉移矩陣%時-空動態縯變%成都平原%中等城市
성시열도효응%열홍외요감%전이구진%시-공동태연변%성도평원%중등성시
urban heat island effects%thermal infrared remote sensing%transition matrix%spatial and temporal dynamic evolution%me-dium-sized cities in Chengdu plain
城市热岛效应是当前城市气候与城市生态环境的研究热点。研究使用Landsat TM/ETM+遥感影像获取城市建成区信息和反演亮度温度,进而评价成都平原6个中等城市的热岛强度、热岛发育程度以及空间动态演变特征。研究发现,在“评价初期→评价中期→评价末期”过程中,成都平原6个中等城市的热岛强度前期增强、后期减弱;城市旧城区的热岛规模普遍减小,这说明,旧城区热环境有所改善,而城市扩展区的热岛规模普遍增大,是因城市扩展明显改变了地表自然环境,导致热岛效应出现,这与城市化进程的内在规律基本一致。绵阳等城市的研究成果表明,即使城市规模扩大,只要城市规划科学合理,并注重城市生态环境的保护,城市热岛效应也能得到有效缓解。
城市熱島效應是噹前城市氣候與城市生態環境的研究熱點。研究使用Landsat TM/ETM+遙感影像穫取城市建成區信息和反縯亮度溫度,進而評價成都平原6箇中等城市的熱島彊度、熱島髮育程度以及空間動態縯變特徵。研究髮現,在“評價初期→評價中期→評價末期”過程中,成都平原6箇中等城市的熱島彊度前期增彊、後期減弱;城市舊城區的熱島規模普遍減小,這說明,舊城區熱環境有所改善,而城市擴展區的熱島規模普遍增大,是因城市擴展明顯改變瞭地錶自然環境,導緻熱島效應齣現,這與城市化進程的內在規律基本一緻。綿暘等城市的研究成果錶明,即使城市規模擴大,隻要城市規劃科學閤理,併註重城市生態環境的保護,城市熱島效應也能得到有效緩解。
성시열도효응시당전성시기후여성시생태배경적연구열점。연구사용Landsat TM/ETM+요감영상획취성시건성구신식화반연량도온도,진이평개성도평원6개중등성시적열도강도、열도발육정도이급공간동태연변특정。연구발현,재“평개초기→평개중기→평개말기”과정중,성도평원6개중등성시적열도강도전기증강、후기감약;성시구성구적열도규모보편감소,저설명,구성구열배경유소개선,이성시확전구적열도규모보편증대,시인성시확전명현개변료지표자연배경,도치열도효응출현,저여성시화진정적내재규률기본일치。면양등성시적연구성과표명,즉사성시규모확대,지요성시규화과학합리,병주중성시생태배경적보호,성시열도효응야능득도유효완해。
At present , research about Urban Heat Island Effects ( UHI) is a hot issue in urban climate and urban ecological environ-ment.This research obtained brightness temperature and urban information using remote sensing data of Landsat TM /ETM+, and re-searched intensity , development degree , spatial structure and dynamic evolution of UHI of six medium -sized cities in Chengdu Plain . This research found that urbanization is the internal driving force leading to UHI .In the initial stage→interim stage→final stage, the overall heat island intensity trends in various cities in Chengdu Plain showed early enhanced and weakened late .The heat island size in the old town generally reduced , which indicated that the thermal environment has improved for the majority of the city 's old town. The size of the heat island in urban expansion area generally increased , because urban expansion significantly changed the natural en-vironment , which leading to the heat island effect phenomenon .These research results are consistent with of urbanization inherent laws.Research results in Mianyang City also proved that , even if the urban scale expands , the urban heat island effect can be effec-tively alleviated, if urban plan is scientific and reasonable , and attached importance to protecting urban environment .