City Park Acoustic Environment Survey And Evaluation-A Case Study Of Xiangfu Culture Park In Changsha

With the concept of "park city",people have higher and higher requirements for the comfort of human life.With the people-oriented design concept deeply rooted in people's hearts,comfort has become one of the criteria for judging people's quality of life.Along with the fact that noise pollution has become more and more serious in recent years,it has caused certain negative impacts on people's mind and body.Parks are the areas where people's daily leisure activities have high traffic flow,and the quality of acoustic environment has not attracted attention,which has affected people's recreation experience.Therefore,the optimization of the park's acoustic environment is imminent.Taking Changsha Xiangfu Cultural Park as an example,this paper uses the combination of fixed-point measurement and Cadna/A simulation to evaluate and optimize the acoustic environment of the park.The main results are as follows:(1)Conducting on-the-spot investigation and measurement of Changsha Xiangfu Cultural Park,and obtaining data such as the planning and layout of the Xiangfu Cultural Park and its surrounding areas,elevation,traffic volume,and sound level values of various areas of the park,and clarifying the sound around the measurement site.The source type and interviewed the visitors'evaluation of the park's acoustic environment;(2)Using the method of subjective and objective combination to evaluate the acoustic environment of Changsha Xiangfu Cultural Park,and explore the relationship between acoustic environment satisfaction and subjective loudness,goodwill and coordination.Subjective evaluation gives the soundscape in the park.It is mainly composed of natural sound,living sound and artificial sound.The tourists have the highest satisfaction with natural sound,the second is the life sound,and the artificial sound is the lowest;the objective evaluation shows that the sound level inside the park is mostly in the interval of 55-60dB(A).The sound level values around the road are all over 70dB(A).Overall,the west side acoustic environment with rich terrain changes is better than the east side.(3)Using the Canda/A computer simulation method,the parameters of the park's acoustic environment(such as road traffic flow,building layout,terrain)are changed.It is concluded that the park acoustic environment quality is inversely proportional to the road traffic volume.The larger the flow rate,the worse the acoustic environment quality;the layout of the building is inseparable from the sound environment quality of the park.The result shows that the hybrid>parallel>vertical type is mainly due to multiple reflections between the buildings with the vertical layout of the road.The reverberation effect is generated,which causes a large part of the facade of the building to be exposed to noise to make the acoustic environment worse.The terrain promotes the optimization of the acoustic environment of the park,and the Xiangfu is obtained by changing the topographical difference of the surrounding buffer zone on the west side.The noise distribution map of the cultural park,the area with a sound level greater than 60dB(A)decreased significantly.The main reason is that the increase of the height difference enriches the vertical change,and the sound absorption barrier is formed vertically,which blocks part of the road traffic noise,thereby improving the The quality of the acoustic environment in the park.(4)Based on the current situation of the Changsha Xiangfu Cultural Park,the noise reduction measures are taken.According to the optimization principle,the optimization countermeasures of the park acoustic environment are discussed from the perspective of various acoustic elements,and the park acoustic environment is optimized from the planning level to the landscape design level.Based on the reference,it provides relevant reference for the acoustic environment evaluation and optimization of small-scale parks in China.The purpose of this paper is to better optimize the sound environment of the park through the study of the factors affecting the acoustic environment of the park,to provide a five-story garden landscape space for visitors,and to explore how to construct a livable acoustic environment space.At the same time,the designer hopes to strengthen the consideration of the acoustic environment elements in the planning and design stage,and learn about the psychology of the tourists through questionnaires,and consider the urban acoustic environment from the perspective of Cadna/A simulation software to contribute to the improvement of the park acoustic environment.