基于电路理论的多尺度城市热环境网络构建及格局优化：以成都市中心城区为例

高密度、高强度的城市建设和扩张导致城市热岛效应不断增强,研究城市热环境网络格局以优化规划布局是改善城市热环境的有效方法。将形态学空间格局分析与电路理论相结合,立足多尺度,以成都市中心城区及其核心区为研究对象,选取连通性强的冷岛、热岛源地,根据景观格局特征与地表覆盖构建阻力面,运用Linkage Mapper识别廊道、冷岛障碍点和热岛夹点,并进行分级和评价,构建研究区热环境网络,提出多尺度下的格局优化建议。结果表明：1)中心城区尺度识别出23处冷岛源地、34条关键廊道、48处障碍点,廊道呈“串珠状”环绕研究区边缘分布,连通性和稳定性较弱;2)中心城区核心区尺度识别出34处热岛源地、81条关键廊道、98处夹点,廊道呈网状分布且普遍连通性较高,夹点是未来阻断热岛廊道连通的关键区域;3)研究区形成“两环多分支五组团多点”结构的城市热环境网络格局。研究结果可为成都市及其他城市的热环境改善提供科学参考,丰富电路理论在热环境领域中的应用。

Construction and Pattern Optimization of Multiscale Urban Thermal Environment Network Based on Circuit Theory: A Case Study of the Central Urban Area of Chengdu

High-density and high-intensity urban construction and expansion have led to the continuous enhancement of urban heat island effect, and studying the urban thermal network pattern to optimize the planning layout is an effective way to improve the urban thermal environment. This study combines morphological spatial pattern analysis with circuit theory, takes the central urban area of Chengdu and its core area as the research object based on multiple scales, selects cold island and heat island sources with strong connectivity, constructs resistance surfaces based on landscape pattern characteristics and surface coverage, uses Linkage Mapper to identify corridors, cold island barriers and heat island pinch points, performs classification and evaluation, constructs a thermal environment network in the study area, and proposes suggestions for pattern optimization at multiple scales. The results show that: 1) At the central city scale, there are 23 cold sources, 34 key corridors and 48 barriers, and corridors are beaded around the edge of the study area, with poor connectivity and stability; 2) At the core area scale, there are 34 heat sources, 81 key corridors and 98 pinch points were identified, corridors are distributed in a network and generally with high connectivity, amd the pinch points are the key areas to block the connectivity of heat island corridors in the future; 3) The study area forms an urban thermal environment network pattern with the structure of "two rings, multiple branches, five clusters, and multiple points". The study can provide scientific reference for the improvement of thermal environment in Chengdu and other cities, and enrich the application of circuit theory in thermal environment field