大连市城市绿地缓解热岛效应研究.docx

大连市城市绿地缓解热岛效应研究
 
 
李星明　张靖　李雪柔　刘妍　卢盈宇
摘 要：热岛效应指城市气温高于郊区的现象。城市绿地通过蒸腾作用和遮荫效应形成“冷岛”，具有缓解城市热岛效应的作用。选取大连市作为研究区，应用定量遥感的方法，选取4期Landsat 8 OLI遥感数据，基于大气校正法反演出大连城市地表温度，并在此基础上采用Pearson相关性，分析绿地缓解热岛效应大小与绿地面积、NDVI指数及到海洋的距离之间的关系。结果表明：大连市城市建成区存在着较严重的城市热岛现象，超过60%的区域地表温度在33 ℃以上；与内陆城市绿地降温效果研究结果相似，大连市绿地的降温距离与绿地面积和NDVIMean有关，但与到海洋的距离没有相关性，且随着面积的增大，降温距离的增加呈对数变化规律。
关键词：热岛效应；缓解；城市绿地；大连市
：X12 ：A DOI 编码：.1006-
Abstract： The heat island effect was a phenomenon in which the urban air temperature was higher than that in the suburb. The urban green
spaces formed the "cold island" by transpiration and shading effect， which could relieve the urban heat island effect. Based on the atmospheric correction method， the urban surface temperature of Dalian city is retrieved and the Pearson correlation was used to analyze the relationship between mitigation of green spaces on the heat island effect and green space area， NDVI index and the distance to the ocean. The results showed that there was a more serious phenomenon of urban heat island in urban built-up area of Dalian City， more than 60% of the regional surface temperature above 33 ℃. Compared with the inland city green space cooling effect of similar results， Dalian green space mitigation distance was connected with green space area and NDVIMean， but there was no correlation relationship with the distance to the ocean