2种外部环境对城市带状绿地温湿效益的影响比较

摘要

In this paper,two types of green belt:road side and river side green belts occurring in the Relics Park of the Capital City Wall of Yuan Dynasty were investigated to analyze the ecological benefits on the surrounding environment.The results showed that the influential width of the 15-meter-wide river on the temperature-humidity of urban green belts was 28 meters,and the influential width of the same width road on the temperature-humidity urban green belts was 20 meters.Under the condition of the same width and similar degree of canopy,the effects of temperature and humidity were measured at the point n5 (10 m),it showed that the temperature of the green belt with external environment for the river was 1.28℃ lower than the control,and the relative humidity was 4.47％ higher than the control,while the temperature of the green belt with the external environment for the road was 1.14℃ higher than the control,the relative humidity was 4.63 ％ higher than the control was lower than the control.Within the influence scope of river or road,the value of temperature-humidity index of the green belts with external environment for the river was relatively low,and the comfort was high.%选择宽度相同(64 m)、郁闭度(70％～75％)相似的元大都城垣遗址公园2种绿地类型作为试验对象,对比探讨了不同外部环境类型(道路、河流)对城市带状绿地温湿效益影响差异,综合3d不同时段的测试数据.结果表明,河流(宽度为15m)对带状绿地温湿效益的影响范围为28 m,道路(宽度为15 m)对带状绿地温湿效益的影响范围为20 m;在宽度相同、郁闭度相似条件下,选取影响效果明显的第n5点(即10 m处)进行温湿度测定,发现外部环境为河流的带状绿地温度比对照低1.28℃,相对湿度比对照高4.47％,而外部环境为道路的带状绿地温度比对照高1.14℃,相对湿度比对照低4.63％;城市带状绿地在受河流或道路的影响范围内,外部环境为河流的带状绿地THI值相对较低,舒适性较好.