基于MODIS的长三角城市群热岛特征分析

发布时间：2018-04-23 17:08

本文选题：城市热岛 + LST　；参考：《上海师范大学》2015年硕士论文

【摘要】：近年来,我国城市化进程速度加快,下垫面的变化造成建成区与郊区平均气温差异加大,产生城市热岛效应,成为当今城市可持续发展面临的一个重要环境问题。长三角城市群地区为我国发展最快的区域,拥有上海、南京、苏州等经济发达、人口众多的城市,其热岛效应尤为突出。另一方面,遥感和GIS技术在近几十年间得到长足的发展。遥感图像处理与GIS技术相结合已经成为城市热岛研究的重要工具。遥感产品数据的分析对研究长三角地区城市化造成的热岛效应变化有重要意义。本次研究以长三角地区为研究区域,涵盖上海市、江苏省、浙江省,采用MODIS的地表温度产品、植被指数产品、土地利用变化产品等三组数据进行分析。从时间、空间变化角度分析了2001年至2013年间研究区域的白天地表温度四季和年际变化。利用夏季平均地表温度提取出强热岛像元,并对13年来研究区域强热岛像元数量变化进行分析,研究了各城市热岛像元数量,以及各个城市的热岛像元占城市面积的比例情况。分析了研究区域13年来NDVI季节和年际变化。研究了建成区的变化情况。利用NDVI数据进行不透水面提取,并分析不透水面的变化。研究了热岛效应与热岛因子在长三角范围以及地级市范围上的相关。结论如下：(1)长三角地区13年间年均白天地表温度比较接近,年均温度最低的年份为2012年,年均温度最高的年份为2013年。从空间角度来看,地表温度变化最大的区域以及热岛主要集中区域为苏南城市、上海、环杭州湾地区。(2)强热岛主要集中在建成区。2013年夏季强热岛面积前四的城市分别为上海、杭州、宁波、苏州等工业城市。13年间夏季和年均强热岛像元数量以及强热岛像元占城市面积比的变化幅度较大。(3)建成区和水体的NDVI较低且在四季中变化较小。13年来,研究区域的夏季平均NDVI有所减少。研究区域内建成区和不透水面有明显的扩张,以苏.南城市、上海、环杭州湾地区为主。(4)对2001年和2013年夏季长三角地区及不同城市进行分析,发现LST与NDVI、建成区、ISA的分布有一定相关性,LST与NDVI有负相关性,LST与ISA有正相关性。LST与ISAI的相关系数高于其与NDVI的相关系数。
[Abstract]:In recent years, the process of urbanization in China has been speeding up, and the change of the underlying surface has caused the difference between the average temperature between the built area and the suburb to increase, which has produced the urban heat island effect, and has become an important environmental problem facing the sustainable development of cities. The Yangtze River Delta urban agglomeration is the fastest growing area in China, with Shanghai, Nanjing, Suzhou and other cities with developed economy and large population, its heat island effect is especially prominent. On the other hand, remote sensing and GIS technology have made great progress in recent decades. The combination of remote sensing image processing and GIS technology has become an important tool for urban heat island research. The analysis of remote sensing product data is of great significance to study the change of heat island effect caused by urbanization in Yangtze River Delta region. This study takes the Yangtze River Delta as the research area, covering Shanghai, Jiangsu, Zhejiang Province, using MODIS land surface temperature products, vegetation index products, land use change products and other three groups of data were analyzed. The seasonal and interannual variations of daytime surface temperature in the study area from 2001 to 2013 were analyzed from the point of view of temporal and spatial variation. The seasonal and interannual variations of NDVI over the past 13 years in the study area were analyzed. The change of the built area is studied. The impermeable surface was extracted by NDVI data and the change of impermeable surface was analyzed. The correlation between the heat island effect and the heat island factor in the Yangtze River Delta and the prefecture-level cities is studied. Conclusion: 1) the annual average daytime surface temperature in Yangtze River Delta is close to that in 2012, and the lowest in 2012, and the highest in 2013 in the Yangtze River Delta. The average NDVI in the study area decreased in summer. The study area of the built area and impermeable surface has obvious expansion to Su. This paper analyzes the Yangtze River Delta region and different cities in the summer of 2001 and 2013.
【学位授予单位】：上海师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X16;X87

【参考文献】