To better understand the cooling effect of a raingarden in Fitzroy Gardens, Melbourne, as well as its benefits for an urban microclimate, two rounds of 36-h microclimate monitoring at the raingarden were conducted. Land surface temperature and soil moisture were analyzed according to monitoring data. The results show a clear raingarden cooling effect in summer. The largest difference of land surface temperatures inside and outside the raingarden can reach 23.6 ℃, and the diurnal variation in temperature inside the raingarden was much less than that outside the raingarden. The soil moisture increased rapidly after irrigation, with the increase in the volumetric water content (VWC) of 2% to 3.6%. The soil moistures of adjacent irrigated garden beds and grass were higher than those inside the raingarden. Monitoring soil moisture helps guide raingarden irrigation.%为了解墨尔本Fitzroy公园的雨水花园在夏季里的降温情况,以期为海绵城市改善城市微气候的研究提供数据支持,记录了2次连续36 h微气候观测过程,根据观测数据进行了地表温度与土壤湿度的分析.结果表明:雨水花园在夏季有明显的降温作用,雨水花园地表温度内外差值最大达到23.6 ℃,内部温度变化缓于雨水花园外的地表温度变化;灌溉后土壤湿度迅速提升,体积含水量(VWC)上升幅度在2% ~3.6%;花园与草地等绿地土壤湿度高于雨水花园内部土壤湿度;监测土壤湿度有利于指导雨水花园的灌溉方式.
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