硬质地HDPE沙障防风效益的风洞试验  

Wind tunnel test on windproof benefit of horniness HDPE sand barrier

作　　者：张帅 丁国栋[1,2] 高广磊 孙桂丽[3] 赵媛媛 于明含[1,2] 丛智杰[1] 包岩峰 Zhang Shuai;Ding Guodong;Gao Guanglei;Sun Guili;Zhao Yuanyuan;Yu Minghan;Cong Zhijie;Bao Yanfeng(School of Soil and W ater Conservation,Key Laboratory of National Forestry and Grassland Administration on Soil and Water Conservation,Beijing Forestry University,Beijing 100083,China;Yanchi Ecology Research Station of the Mu Us Sandy Land,Yanchi 751500,Ningxia,China;Forestry and Horticulture Department,Xinjiang Agriculture University,Urumqi 830052,Xinjiang,China;Institute of Desertification,Chinese Academy of Forestry,Beijing 100091,China)

机构地区：[1]北京林业大学水土保持学院,水土保持国家林业和草原局重点实验室,北京100083 [2]宁夏盐池毛乌素沙地生态系统国家定位观测研究站,宁夏盐池751500 [3]新疆农业大学林学与园艺学院,新疆乌鲁木齐830052 [4]中国林业科学研究院荒漠化研究所,北京100091

出　　处：《北京林业大学学报》2020年第3期127-133,共7页Journal of Beijing Forestry University

基　　金：内蒙古自治区科技重大专项课题“沙化土地抗逆树种筛选与适地适树研究”。

摘　　要：【目的】研究硬质地HDPE网沙障防风效能。【方法】按照1:10的比例制作不同高度(1、2和3 cm)、不同边长(10、15和20 cm)、不同孔隙度(0.5和0.6)的硬质地HDPE网沙障模型,通过布设测点模拟出不同配置模式下沙障网格纵截面流场图及风速稳定后沙障网格内水平流场图,并运用地统计学的方法进行空间自相关分析。【结果】空间自相关分析中18种不同配置模式的沙障有16种符合高斯模型,2种符合球状模型,且所有模型R2均高于0.97,空间相关度小于25%,变程大于测点间距,表明不同沙障网格都具有强烈的空间自相关性,且测点间距合理。气流在通过沙障时可顺畅的从沙障孔隙中穿过,不会造成气流的抬升加速作用,因此障后近地表及沙障上方的风速均低于相同高度处的对照风速。硬质地HDPE沙障防风效能在本研究设置的变量梯度范围内与高度呈正相关关系,与边长和孔隙度呈负相关关系,高度和孔隙度对防风效能的影响较大。【结论】硬质地HDPE材料性质稳定,不会产生塑性变形,抗老化能力强,且防风效果较好,应用前景较好。[Objective] The objective of this study was to research the benefit of horniness HDPE sand barrier on windproof. [Method] We have made horniness HDPE sand barrier model of different heights(1,2 and 3 cm), lengths(10, 15 and 20 cm), and porosity(0.5 and 0.6) according to the 1:10 ratio. We simulated the vertical flow field map and the horizontal flow field map of stable wind speed grid under different configuration modes by laying out the measuring points, and used the geostatistical method to carry out spatial autocorrelation analysis. [Result] In the spatial autocorrelation analysis, there were 16 kinds of sand barriers in 18 different configuration patterns conforming to the Gauss model, 2 conformed to the spherical model, and the R2 of all the models was higher than 0.97, the spatial correlation was less than 25%, and the change range was larger than the distance between the measuring points. It showed that the different sand barriers all had strong spatial autocorrelation, and the distance between measuring points was reasonable.The airflow can smoothly cross the pores when passing through the sand barrier, which will not cause the lifting and acceleration of the air flow. Therefore, the wind speed near the surface and above the barrier was lower than the control wind speed at the same height. The wind-proof performance of the horniness HDPE sand barrier was positively correlated with the height within the variable gradient range set in this study, and negatively correlated with the side length and porosity. [Conclusion] The horniness HDPE material has stable properties, no plastic deformation, strong anti-aging ability, good windproof effect and good application prospects.

关 键 词：硬质地 HDPE沙障 空间自相关 风速流场 

分 类 号：S157.1[农业科学—土壤学]