Research On Microclimate Control Technology Of Ecological Landscape In Xi’an Olympic Sports Park

As a special type of sports park,the sports park of Olympic Sports center has a large building complex and covers a wide area.And the landscape is mostly regular or mixed garden The microclimate of the park has an important impact on the life and health of the active population.Reasonable design can improve the exercise environment of the active population and improve the quality of life.The Olympic Sports Center park has its fixed functional elements and typical layout pattern,and the microclimate under the typical pattern has its common laws.This article has summarized the typical pattern of the Olympic sports center of park of 10 high level events in 20 years.Implement the underlying surface field measurement on the ten typical Olympic sports center park,such as Jinan,Tianjin.Using the ENVI-met micro climate numerical simulation software,the micro climate characteristics of typical park layout mode and the ecological landscape control technology is studied,in order to provide technical reference to the xi ’an Olympic sports center park which is the same pattern.The main conclusions are as follows:(1)A "品" glyph arranged "a two house" is the layout pattern and the stadium arrangement separately in the "three a pavilion" on one side of the park.(three small venues finished a “品” glyph configuration,stadium alone to decorate,the stadium and three small venues connected with platform)Above can be regarded as the Olympic sports center park rules typical mode of the layout.(2)The field test results show that the temperature and humidity index of the tree forest in Jinan Olympic Sports Center is 26 at 15:00 in summer,which is less than that of the tree forest in Tianjin Olympic sports center park at 28.5 at the same time,themicro-climate control ability and climate comfort of the compound greening structure are better than those of the simple greening structure The air temperature at 1.5 m increased with the increase of the underlying surface temperature.Among the 10 kinds of typical underlying surface in the park,the difference of temperature among the three kinds of underlying surface was the biggest,and the temperature rising speed was fast.Therefore,the park underlay pavement,artificial turf,color asphalt and concrete three materials should avoid large-area centralized layout.(3)The microclimate simulation of the park shows that the radiation of the park buildings,squares and urban arterial roads is the main problem of the park thermal environment.Compared with the Arbor forest area,the temperature around the stadium increased by about 1 ℃,and the wind environment of the Olympic sports center park was greatly influenced by the shape of the stadium and the layout of the stadium,the streamline design of the main stadium causes the local wind speed on both sides of the main stadium to be too high.The acceleration wind zone on both sides of the main stadium of the Jinan and Tianjin Olympic Sports Center,the wind speed value is 1.8 times and 1.23 times of the wind speed coming from the main stadium respectively,the higher the wind speed of "narrow pipe wind" is,the Jinan Olympic Sports Center "narrow pipe wind" is 1.4 times of the incoming wind speed.(4)The design key points are put forward from two aspects of regulating the micro-climate in the park and resisting the influence of the external environment of the park on the micro-climate in the park,it is concluded that the microclimate control ability of trees is the strongest,and the influence of urban trunk roads on the thermal environment of the park can be reduced by adding trees and shrubs to the boundary of dominant wind direction The micro-climate of the decentralized layout mode of the Park Square greening is superior to the centralized layout;the enclosed layout should be given priority in the layout of the outdoor training grounds,and the east-west greening layout is superior to the north-south greening when the greening is arranged unilaterally,the low temperature area of the training ground is larger under this pattern.(5)Based on the key points of microclimate control technology,this paper putsforward some suggestions on the optimization of the landscape plan of Xi’an Olympic Sports Center Park.The results show that the main reason for the worse microclimate comfort degree of the park is the tree-tree belt arrangement in the greening group,increasing the number of trees and shrubs in the East and West Directions of the greening groups on both sides of the main stadium can obviously improve the thermal environment of the greening groups and the central square of the park.Compared with before optimization,the temperature of the greening groups decreased by 0.6℃ at15:00,the temperature of the central square decreased by 0.3℃,and the ecological landscape optimization scheme of Xi’an Olympic Sports Center was put forward.