基于MSPA模型和电路理论的衡阳市主城区热环境空间网络构建

Construction of a Spatial Thermal Network in the Main Urban Area of Hengyang City Based on MSPA Model and Circuit Theory

摘要: 随着城镇化的快速推进，城市热岛效应愈发显著，对生态环境和居民健康造成了严重威胁。以衡阳中心地区为例，通过运用Landsat 5/8地表温度遥感影像，识别衡阳市中心城区热环境空间变化特征。运用形态学空间格局分析方法(MSPA)和电路理论确定了城市核心热岛景观斑块、热环境廊道和重要节点区域，并分析其时空演变特征。研究结果表明：(1) 2011~2019年衡阳市中心城区热岛景观斑块趋于集中，热岛区域面积显著增加。(2) 热岛核心区域面积占热岛景观面积的比例最高。热岛斑块之间连通性与聚集度进一步提高。(3) 通过电路理论识别出58条热环境廊道，障碍点区域86处，一级夹点区域106处。在采取规划措施时，可以中断夹点区域之间的联系，以减缓整个区域的热岛效应，同时重点保护热环境网络的障碍点区域。研究结果对衡阳市主动减缓城市热岛效应，推动城市可持续发展具有重要的实践指导意义。

Abstract: The urban heat island effect is growing in importance due to the quickening pace of urbanization, which poses a major risk to the health of the local population and the environment. Using Landsat 5/8 surface temperature remote sensing pictures, the spatial change features of the thermal environment in the core city of Hengyang were discovered, using the central region as an example. The urban core heat island landscape patches, thermal environment corridors, and significant node regions were identified, and their spatial and temporal evolution characteristics were analyzed, using the morphological spatial pattern analysis (MSPA) approach and circuit theory. The study’s findings indicate that: (1) The central urban area of Hengyang City has a tendency to have concentrated heat island landscape patches, and between 2011 and 2019, the extent of these places rose dramatically. (2) During the study period, the core heat island area comprised the largest percentage of the heat island landscape area. There was a considerable increase in the connection and aggregation amongst heat island regions. (3) Using circuit theory, 58 thermal environment corridors, 86 obstacle point locations, and 106 first-level pinch point areas were found. To reduce the heat island effect throughout the entire region, planning strategies that prioritize the protection of the thermal environment network’s obstacle point locations may involve breaking the link between the pinch point areas. The study’s conclusions provide Hengyang City with crucial, actionable advice on how to reduce the impact of the urban heat island and advance the city’s sustainable growth.