Study On The Wind Environment Of Rural Buildings In The Coastal Mountainous And Hilly Areas Of Zhejiang Province

In recent years,with the development and construction of land resources and wind resources utilization projects in the mountainous and hilly coastal areas of Zhejiang Province,more and more projects have been developed.The continuous development of rural revitalization strategy and the increasing demand for new rural construction have drawn much attention to the quality of living environment in rural areas.In the aspect of human settlement environment research,the wind environment research of urban residential areas is relatively abundant,but the research of rural residential buildings,especially low buildings under complex terrain is relatively scarce.In addition,most of the current standards and research results are mostly applicable to plain areas,and they are not targeted enough to provide clear guidance for wind environment research of buildings in mountainous and hilly coastal areas of Zhejiang Province with complex landforms.This research takes the wind environment in the mountainous and hilly coastal areas of Zhejiang province as the research object.Through the analysis of wind field data,the field wind environment investigation and test in the case area,and the multi-scale simulation of local near-earth wind field based on WRF and CFD numerical simulation methods,the wind environment evaluation system of low buildings in the mountainous and hilly coastal areas of Zhejiang Province is preliminarily constructed.The wind environment of the case area is evaluated and the wind environment of the low-rise buildings in Huang Xian village is good.It provides reference for architectural layout planning and wind environment optimization in coastal mountainous and hilly areas.Firstly,by reviewing relevant literature and existing wind environment evaluation methods and standards,the wind environment in the coastal mountainous and hilly areas of Zhejiang was reviewed,and the technical background was summarized.Taking Huang Xian Village in Feng Hua,Ningbo City as the research object,through physical geography condition analysis,field research and mesoscale numerical simulation WRF,the current situation of wind environment of local low-rise buildings and the existing problems of wind environment in this area are comprehensively understood.The results show that Huang Xian Village has a comfortable climate,with an overall warm winter and cool summer.The average wind speeds in winter and summer are 2.0 m/s and 1.8 m/s respectively,with the dominant wind direction mainly being the northwest direction.By analyzing the local outdoor macro wind environment from multiple dimensions such as wind profile maps,wind speed and direction rose maps,and mesoscale wind field distribution maps,the results show that the wind environment in this area is mainly affected by factors such as climate conditions,terrain,and building layout.The overall wind speed in Huang Xian Village is relatively small,and the proportion of calm wind areas is relatively large.Secondly,the outdoor wind environment of Huang Xian village is simulated by PHOENICS,and the wind environment data is calculated accordingly.Based on the wind environment simulation results,the wind field distribution characteristics at outdoor pedestrian height in summer and winter were analyzed,and the existing meteorological data were used to analyze and judge the wind speed probability distribution model in the case area under the good climate.The exceeding threshold probability method,statistical data of meteorological data and wind field information obtained from the CFD numerical simulation were used to study the pedestrian wind environment in Huang Xian Village.The results show that the comfort level of pedestrians around the low-rise buildings in Huang Xian village is general,and the probability of exceeding the threshold is far less than the risk probabilityFinally,a benign wind environment evaluation system suitable for coastal mountainous and hilly areas in Zhejiang province is established.The system uses a combination of qualitative and quantitative methods to score each sub-item,so as to evaluate the wind environment quality of low-rise rural buildings under benign wind conditions.The case calculation shows that the overall score of the winter monsoon environment in the region is 3.65,and the overall score of the summer monsoon environment is 3.75.The overall performance of the wind environment in Huang Xian Village is good.Due to the differences in terrain,topography,and meteorological conditions,it is generally not possible to obtain universally applicable conclusions for wind environment analysis,and it is necessary to conduct targeted research on a case-by-case basis.However,the technical methods and routes proposed in this article for analyzing and evaluating the wind environment of low-rise buildings in mountainous and hilly areas along the coast of Zhejiang Province will provide a clear path for engineering site selection and design optimization.