Study On Windproofing Effect Of Korshinskii Shrub With Different Distribution Patterns

The construction of wind-proof vegetation in sand areas is an important measure to prevent and control desertification in arid areas in northwest China.Among them,korshinskii shrub is used as an important wind-proof and sand-fixing barrier in sand area.In this paper,caragana caragana,a common plant in dengkou county,bayan nur city,Inner Mongolia autonomous region,was studied.From vegetation configuration pattern,through to the individual korshinskii,caragana korshinskii ondemond distribution,uniform distribution type distribution korshinskii,clusters of caragana korshinskii and different configuration mode line belt korshinskii wind speed were observed before and after the study,the wind speed,the aerodynamic roughness under different configuration pattern such as factor analysis,this paper discusses the different configuration pattern korshinskii windproof effect.The results are as follows:(1)When the airflow passes through caragana korshinskii,a deceleration zone is formed after the plant,and the wind speed increases first and then decreases on both sides of the plant model.The wind speed is the smallest at 2H on the leeward side,and then increases gradually.Wind speeds at different heights at the same location increase with height.(2)Through wind speed observation of dispersed caragana square with different coverage,it was found that with the increase of vegetation coverage,the wind protection effect of vegetation was more obvious,and the aerodynamic roughness was in a cubic function with the increase of coverage.Under the condition of the same vegetation coverage,the uniform distribution caragana model was better than the random distribution and the cluster distribution.(3)Through the experiment of korshinskii shrub with row band arrangement,it is found that the better the wind protection effect is with the increase of row number.However,the more the number ofrows,the better.The protection efficiency of three-row conformation is less obvious than that of two-row conformation.In order to ensure the maximization of economy and benefit,it is suggested to choose the two-row conformation of korshinskii shrub in practice.The wind protection efficiency of korshinskii shrub with row spacing of 1H was slightly better than that of the other two types of korshinskii shrub with row spacing of 1H.It is suggested to choose the korshinskii shrub with row spacing of 1H.Experiments were carried out on korshinskana shrub in two rows of korshinskana.The average wind protection efficiency was 77.2%,73.3%,65.4%,58.5%,and 47.2% in 4H,6H,8H,10 H and 12 H.Comparing with the local sand-driving wind speed,it is suggested that the bandwidth of caragana caragana should be between 4H and 10 H in the actual construction.(4)By comparing the distribution of the same vegetation coverage with that of the uniform korshinskii shrub,it was found that the wind protection efficiency of the korshinskii shrub with the uniform distribution was significantly higher than that of the uniform distribution.According to the local wind speed data for many years,it is suggested that the best configuration scheme is two-row caragana with row spacing of 1H and band spacing of 4-10 h.