Wind Environment Simulation And Landscape Reform Of Northeast Agricultural University

Northeast Agricultural University is located at the junction of urban and rural areas and adjacent to the chemical plant.The wind environment and air quality in the campus are poor year-round.In spring and autumn,the wind speed is high,as a result,frequent dusting occurs and ground garbage is collected.The phenomenon causes extremely harsh stimuli to teachers' and students' respiratory system.Based on the reality,this study was conducted in order to use landscape planting methods to improve the wind environment in Northeast Agricultural University and improve the air quality.The research combines multidisciplinary knowledge such as landscape architecture and aerodynamics,which will help enrich and develop the landscape architecture system and have a long-term theoretical significance.Exploring the relationship between the landscape design and wind environment,using landscape plants rationally to impact on the outdoor space microclimate has a profound practical significance for improving the quality of the campus' environment.This paper takes the wind environment of Northeast Agricultural University as the research object,consulting lots of reference,using the Computation Fluid Dynamics(CFD)numerical simulation technology,combing Harbin wind speed and wind direction data,qualitatively and quantitatively analyses and sums up the causes of wind environmental problems and explores the transformation strategy based on landscape planting design.There are mainly the following results.(1)Innovatively use spherical three-dimensional model and cylindrical assembly three-dimensional model as geometric models of shrubs and arbors,and verify the rationality.(2)The effect of reducing wind speed in the horizontal direction was as follows: forest planting> group planting> cluster planting> line planting> two symmetrically planting> orphan planting.And it is in vertical direction that 15 m high arbor + 8m medium arbor + 4m small arbor + 2.5m bush + 0.2m ground covers> 2.5m shrub + 0.2 m ground covers> 15 m high arbor + 8m medium arbor + 4m small arbor + 0.2m ground covers.So it can be inferred that the ability of vertical plant community structure to reduce the wind speed ranks as arbors-shrubs-grass,shrubs-grass,arbors-grass.(3)Combining GIS and 3D modeling from the perspective of wind environment simulation,we have learned how to implement 3D model using Supermap and CAD campus planning ichnography.By collecting data,I obtained the wind rose map of Harbin City in the spring of 2017.PHOENICS software is used to simulate the wind environment under the current conditions of the Northeast Agricultural University campus,and the wind speed cloud map and wind speed vector diagram at a height of sight--1.5 m was obtained.Through the analysis of the simulation results,locations where the wind can easily occur and possible causes are concluded.(4)Six typical windy areas are selected for transforming plant landscapes according to the analysis of the reasons.The adjusted plant landscape is simulated with CAD model and PHOENICS to verify the feasibility and generality of the above landscape reconstruction.