| 摘要: |
| 文章用遥感技术及1995 年、2010 年、2015 年多期Landsat 影像对昆明20 a 的温度变化进行
研究，基于不同地表辐射温度，将所有地块分为5 个温度等级：相对低辐射温度区域（<13.89 ℃），相对
较低温辐射温度区域（13.89~20.67 ℃），中等辐射温度区域（20.67~27.45 ℃），相对较高温辐射温度区域
（27.45~34.23 ℃）和相对高温辐射温度区域（>34.23 ℃），分析城市的热力场变化与下垫面类型变化之间
的关系。结果表明，经过了20 a 的城市化进程，昆明市的低温区逐渐缩小至完全消失，而高温区则是从
无到有，再到逐渐扩大，至2015 年高温区的面积已经达到1995 年高温区面积的13 倍。下垫面的变化是
影响城市地表辐射温度发生变化的主要原因，建筑材料和裸露的地表都具有很高的吸热能力，因此建筑
面积和未利用荒地面积的增加是导致城市地表温度逐渐升高的主要原因，同时人口的剧增还会导致大量
人为热量的释放，也会导致地表温度的升高。植被可以减缓城市的热岛效应，在城区中，有植被覆盖的
区域温度明显要低于其他地区。因此，合理扩大城市的绿化面积是降低城市地表温度的最有效的办法。 |
| 关键词: 城市热力场 动态变化 遥感 下垫面变化 |
| DOI： |
| 分类号: |
| 基金项目:省自然科学基金 |
|
| Analysis on Instantaneous Spatial Pattern and Dynamics of Thermal Force Field in Kunming |
|
Chang Liu,Xiaorui Wang and Xincen Liu
|
|
Southwest Forest University,Yunnan Kunming 650224,Southwest Forest University,Yunnan Kunming 650224,Southwest Forest University,Yunnan Kunming 650224
|
| Abstract: |
| Using remote sensing technology to study temperature variations of Kunming in two decades
with Landsat data on 1995,2010 and 2015. Based on the instantaneous radiation temperature of the land surfaces
in the city, all the patches were divided into 5 levels, clod radiation temperature (<13.89 ℃ ), cool radiation tempe
-rature (13.89~20.67 ℃ ), medium radiation temperature (20.67~27.45 ℃ ), warm radiation temperature (27.45~
34.23 ℃ ), hot radiation temperature (>34.23 ℃ ) and the relationship between underlying surface changes and the
urban thermodynamic field changes was analyzed. The results showed that through two decades of urbanization,
lowest radiation temperature patches narrowing to vanish completely, and highest radiation temperature patches
raised from none, by 2015, the area of the highest radiation temperature patches had reached 13 times of 1995.
Underlying surface changes was major influential factors of urban surface radiation temperature changes, building
materials and bare ground had highly ability to trap heat, so increased areas of construction land and unused
land were the main cause of the urban land surface temperature increased. Meanwhile the dramatic increase in
population could also lead to a large number of anthropogenic heat release, and resulted in the increase of thesurface temperature. Vegetation could reduce urban heat island effect, in urban areas, the area of vegetation
temperature obviously lower than other regions. Therefore, reasonable expand the city""s green area was the most
effective way to reduce the surface temperature of the city. |
| Key words: urban thermal field dynamics RS underlying surface changes |
