Field Measurement And Analysis Of Microclimate Effects Of Small-scale Water In Urban Parks

Under the background of global warming,with the increasing prominence of urban climate problems,the contradiction between people's pursuit of healthy and comfortable outdoor environment and harsh urban climate has gradually become prominent.As an important part of urban outdoor space,landscape architecture space is an important place for people to take outdoor activities.Its microclimate conditions directly affect the comfort of users.Taking the Prince Bay Park in Hangzhou as an example,the microclimate effects of different types of water in spring,summer and winter were measured and analyzed.The purpose of this study was to explore the influence mechanism of different types of small water on Microclimate in urban parks,summarize their microclimate effects,and design water scenery reasonably for urban parks.It provides theoretical basis for pleasant microclimate.The results show that:(1)In summer,both lakes and streams cool the air temperature and surface temperature,and increase the relative humidity of the air.At the same time,the gentle still water surface can increase the local wind speed.The microclimate effect of Lake still water in winter is similar to that in summer,which shows that the temperature decreases and humidifies,and the local wind speed increases.The larger the area,the more significant the climate effect is.The microclimate effect of stream dynamic water is related to flow velocity and water volume.The water with higher flow velocity and wider water surface can increase temperature.The water or microclimate effect with slower flow velocity and narrower water surface is not significant or similar to that of summer.In spring,the microclimate effect of lake-like still water is the same as that of winter and summer.Most streams have not observed the effect of regulating temperature,humidity and wind speed.Water with higher velocity and wider water surface has obvious cooling effect on air temperature and surface temperature.(2)The microclimate effect of lake-like still water on the surrounding space of water is different from that of water and the azimuth and altitude of the sun.In this study,the effect of cooling and humidification on the eastern side of the water was weakened in the afternoon.(3)The microclimate effect of gentle and static water in spring,summer and winter is cooling and humidifying,which has nothing to do with the water in the form of streams or lakes,but the effect of cooling and humidifying is related to the water,and the effect of cooling and humidifying in lakes is stronger than that of streams.(4)The dynamic water microclimate effects of streams are significantly different from flow velocity and width.Streams with turbulent currents,wide water surface and large flow have the effect of reducing air temperature in summer and increasing air temperature in winter.However,the slow flow and narrow water streams had no obvious regulation effect in spring and winter.(5)Generally speaking,the microclimate effects of small water are more likely to be affected by underlying surface materials,spatial openness,surrounding vegetation green,solar irradiation angle,shading,topography and other factors,which are not consistent with the general law.When solar radiation is strong in summer,the microclimate effects of different types of water are very small.Therefore,many factors should be taken into account in the actual operation,and the actual effect of simply relying on the regulating capacity of the water itself may not be ideal.