【摘要】 利用自动气象站风、温、湿观测资料,对北京城市集中绿地缓解夏季高温(最高气温≥35℃)的效果进行了初步研究。研究结果表明:1)所研究的集中绿地都具有缩短高温持续时间的作用,但对最高气温的调节存在很大差异,有些集中绿地对最高气温几乎没有缓解作用,甚至有增温的可能。因此为发挥集中绿地缓解高温的效果,应尽可能提高绿地的通风条件。2)对北京城来说,集中绿地面积≥20 hm2时,降温效果比较显著。3)在高温天气情况下,集中绿地对高温的缓解作用对人体舒适度的改善,可能会由于集中绿地相对湿度较高而被抵消。更多还原

【Abstract】 From urban automatic weather station system data recorded in Beijing City during 2002,the effect of urban greenbelt on mitigating heat wave temperature during summer season in Beijing City is presented.The analysis demonstrates that urban concentrated greenbelt has discernable regulation on summer heat wave temperature by decreasing its maximum temperature and shortcutting its duration.The effect of greenbelt on ventilation must be considered and eliminated by planting and designing carefully.For Beijing City,when the square of urban concentrated greenbelt should be more than 20 hm2,the mitigating effect is striking then under moderate ventilation conditions.In the other respect,increasing relative humidity in concentrated greenbelt possibly counteracts the amelioration of physical comfort out of mitigating high temperature.更多还原