摘要
以Landsat7/ETM+和快鸟、高分2号遥感影像为数据源,研究金华市建成区夏季热环境的时空特征及土地覆盖类型的城市热环境效应.结果表明:从2005年到2015年,研究区(金华市主城区)夏季热环境发生了很大变化,从区域上看,研究区中心增温不明显,且其局部地区温度下降,研究区其他地方增温显著;从土地覆盖的转换看,水体、植被、裸地转化为厂房后增温20℃以上,林地耕地转化为裸地后增温10℃左右,稀疏林地转化为密林、不透水面转化为植被后降低了地表温度,其最大降幅接近10℃;从变化幅度上看,不透水面的地表温度10年增温幅度远超过植被和水体,而绿化、隔热建筑屋顶分别导致温度下降1.2℃和6℃左右.结论:土地覆盖及其转化是影响城市热环境的主要因素,通过绿化、水体扩容、改变土地利用的类型等方法可以有效地改善城市热环境.
High spatial resolution remote sensing data from both QuickBird,GF-2 and Landsat7/ETM+was utilized to study the temporal and spatial characteristics of the summer thermal environment and assess urban land cover and associated thermal effects by taking Jinhua urban area as a case study.The results indicated that the summer thermal environment in the main urban area in Jinhua changed a lot from 2005 to 2015.In spatial distribution,the land surface temperature(TLS)increased slightly in the center of the study area and even decreased in local areas,but in other areas,TLS increased significantly.In terms of land cover conversion,from water,vegetation or bare land into factory building led to TLS rise 20℃,from woodland or arable land into bare land led to TLS rose 10℃,sparse woodland into thick woodland and impervious surface into vegetation led to TLS reduce 10℃at most.In terms of TLS change,TLS of impervious surfaces and its rise in 10 years was higher than that of vegetation and water surface,however,greening and heat-insulating building roofs caused TLS drops of 1.2℃and 6℃,respectively.Land cover and its transformation were the main factors affected the urban thermal environment.The urban thermal environment was effectively improved by greening,expanding water bodies,and changing the type of land use.
作者
陈梅花
CHEN Meihua(College of Geography and Environmental Sciences,Zhejiang Normal University,Jinhua 321004,China)
出处
《浙江师范大学学报（自然科学版）》
CAS
2020年第3期320-327,共8页
Journal of Zhejiang Normal University:Natural Sciences
基金
广东省科技计划协同创新与平台环境建设重点项目(2019B020208014)
地震动力学国家重点实验室开放基金(LED2018B06)。
