ANALYSIS ON THE LONG TERM COOLING EFFECT OF URBAN GREEN AREA ON URBAN CLIMATE

城市绿地对城市气候的长期降温效应分析

基本信息

批准号：
11660259
负责人：
HONJO Tsuyoshi
金额：
$ 2.3万
依托单位：
CHIBA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11660259/
关键词：
URBAN CLIMATE GREEN AREA ENEGY BALANCE COOLING HEAT ISLAND COOL ISLAND FUNCTION OF URBAN GREEN AREA ROAD OF WIND 冷却効果

项目摘要

Urban green area is considered as a cool island in an urban heat island. We made micrometeorological investigation at Shinjuku Gyoen Park, which is one of large green areas in the center of Tokyo area. We measured special distributions of temperature and humidity, profiles of ground temperature and surface temperature by infra-red thermography. As a result, cool island effect of the park is obvious and cool air flows to the surrounding urban area. At the center of the park, low soil temperature was observed, which indicates low temperature at the park for long term trend. Heat balance calculations indicate that high sensible heat flux from the surrounding urban area and high latent heat flux from the park.A two dimensional k-ε two equation model was used with the equations of temperature and normalized humidity to analyze the thermal effect of urban green areas. The relation between the scale of an urban green area and its influence and the relation between the interval of an urban green area and its influence were analyzed.From the distribution of temperature and normalized humidity, it is observed that a green area of larger scale influences a higher area. From the distribution of diffusivity, a large value was observed at the transition area from green area to urban area and this tendency was the same in the case of two green areas.

城市绿地被认为是一个城市热岛的凉爽岛屿。我们在新月陀螺公园进行了微气候投资，该公园是东京地区中心大型绿色地区之一。我们测量了温度和湿度的特殊分布，地面温度和表面温度的特殊分布。结果，公园的凉爽岛屿效应是明显而凉爽的空气流到周围城市地区。在公园的中心，观察到低土壤温度，这表明长期趋势的公园温度低。热平衡计算表明，周围城市区域的高度明智通量和公园的高潜热通量。二维K-ε两个方程模型与温度方程和归一化湿度一起使用，以分析城市绿色区域的热效应。分析了城市绿色区域的规模及其影响力与城市绿色区域间隔之间的关系与其影响之间的关系。从温度的分布和归一化的湿度，可以观察到较大规模的绿色区域会影响较高的面积。从扩散率的分布中，在从绿色区域到市区的过渡区观察到了很大的价值，在两个绿色区域的情况下，这种趋势是相同的。