Analysis of Thermal Environment in a Street Canyon Using Thermal Images

利用热图像分析街道峡谷的热环境

基本信息

批准号：
05650553
负责人：
HOYANO Akira
金额：
$ 1.47万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

项目摘要

Most studies directed at simulating an urban climate have been based on the consideration that an urban canopy layr can be assumed roughness, and therefore, obtaining a suitable heat balance for an urban canopy layr has been difficult. This problem led to my thesis, which is focused on investigating all urban surfaces using a new index that can evaluate an urban thermal environment during urban development planning. The effects of employing the index are verified using remote sensing and GIS data to investigate the actual conditions of all urban surfaces. In addition, a heat balance algorithm is developed which can simulate these surfaces such that urban thermal images can be constructed.1)A new index based on sensible heat flux, called "heat island potential(HIP)", was defined to express the thermal characteristics of each type of region contained in an urban area, i.c., spatial forms and materials. The optimum mesh scale required to set up an system of particles used to perform the heat balance simulation was found to be 1 m.2)A practical, computer-performance-based method was developed for predicting the surface temperature distributions of all urban surfaces. On the assumption that the surface temperature distributions of surroundings is equal to air temperature, the heat balance of each particle system was simulated. Based on results providing the temperature distribution of all urban surfaces, the long wave radiation from the surroundings was simulated such that the heat balance of each particle system could be simulated again, with this feedback system being optivized after two iterations. The effectiveness of the algorithm developed based on GIS data was verified by comparing calculated results with actual surface temperature distributions observed by remote sensing.

大多数旨在模拟城市气候的研究都是基于以下考虑的考虑，即可以假定城市冠层Layr是粗糙度的，因此，很难为城市冠层Layr获得合适的热量平衡。这个问题导致了我的论文，该论文的重点是使用一个可以在城市发展计划期间评估城市热环境的新指数来研究所有城市表面。使用遥感和GIS数据来验证使用指数的效果，以研究所有城市表面的实际条件。此外，还开发了一种可以模拟这些表面以构建城市热图像的热量平衡算法。1）基于明智的热通量（称为“热岛电位（HIP）”）的新索引被定义为表达包含在Urban区域中的每种类型区域的热特性，i.c.，i.c.，空间和材料。建立用于执行热量平衡模拟的粒子系统所需的最佳网格尺度为1 m.2）开发了一种实用的，基于计算机的绩效的方法，以预测所有城市表面的表面温度分布。假设周围环境的表面温度分布等于空气温度，则模拟了每个粒子系统的热平衡。基于提供所有城市表面温度分布的结果，对周围环境的长波辐射进行了模拟，以便可以再次模拟每个粒子系统的热平衡，在两个迭代后，此反馈系统被选择。通过将计算的结果与通过遥感观察到的实际表面温度分布进行比较，根据GIS数据开发的算法的有效性得到了验证。