Subjects: Geosciences >> Geography submitted time 2024-03-01 Cooperative journals: 《干旱区研究》
Abstract： To find out the characteristics of the wind-sand environment along the under-construction Tumushuk-Kunyu desert highway, the wind-sand protection engineering practice was carried out based on the attributes of wind-sand elements along the desert highway. The wind-sand activity law along the highway was analyzed and summarized by a field survey, ERA5 wind speed data, and satellite image information. The annual average wind speed along the highway was 3.03 –3.28 m·s−1, the average yearly sand wind speed was 5.85–6.10 m·s−1, and the annual sand wind frequency was 16.87%–21.41%. The sand#2;driving wind was concentrated in the spring and summer. April–August was the period with the highest frequency of sand-driving wind in a year. The easterly wind (NE, ENE, E, and ESE) was the main wind along the highway. The frequency of sand-driving wind in the south and west of the Mazatag Mountains was higher than in the north. The annual sediment DP along the line was 99.77–145.30 VU, which belongs to a low wind energy environment and medium variability. The volume and density of the sand dunes on the northern and southern sides of Mazartag Mountain were significantly different. The moving rate of dunes along the line was 1.19–3.69 m·a−1, which was a medium moving speed. There is a significant negative correlation between the moving rate and the vertical projection area of the dunes. The moving direction ranged from 171.76°to 192.53°, consistent with the RDD. The design of the sand control system in the north of Mt. Mazatagh was mainly based on the east, and the south should consider both the east and the west.
Subjects: Geosciences >> Geography submitted time 2023-11-13 Cooperative journals: 《干旱区地理》
Abstract：尉犁-且末沙漠公路（简称尉-且沙漠公路）穿越塔克拉玛干沙漠腹地，对于实现新疆社会稳定和长治久安提供有力交通保障。风沙危害是尉-且沙漠公路建设和通车的主要危害，亟需采取防治措施对该公路进行保护。基于ERA5风况数据，全方位分析了尉-且沙漠公路沿线的风能环境，并结合遥感影像分析沿线的沙丘移动特征，系统阐述了沿线遭受的风沙危害，在此基础上对该沙漠公路提出了有针对性的风沙防治措施。结果表明：（1） 沿线年均起沙风速介于6.03~6.64 ms-1之间，年起沙风频率介于14.73%~30.44%之间。（2） 起沙风主要发生在春夏两季中。起沙风主方向以ENE、E为主。（3） 沿线年输沙势介于106.48~293.70 VU之间，存在低、中两种风能环境，年方向变率指数介于0.49~0.74之间，属中比率，年合成输沙方向介于213.48~255.94之间，各方向季输沙势与季起沙风频率变化特征一致，方向变率指数呈现明显季节变化特征。风能环境的时空变化特征造成了沙丘移动速率的空间差异性，在起沙风作用下，沿线遭受不同程度的风沙危害，沿线按照阻-固原则，有针对性地设置工程、生物并存的防治措施。研究结果全面概述了尉-且沙漠公路沿线的风沙环境特征及危害，为该公路沿线防治措施的设置及后续改进优化提供理论依据。
Subjects: Mechanics >> Applied Mechanics submitted time 2023-03-20 Cooperative journals: 《应用力学学报》
Abstract： In order to explore the feasibility of using desert sand entirely to prepare engineered cementi-tious composites (ECCs) in Xinjiang region , and study the uniaxial compression size effect of ECCs whichare prepared entirely from desert sand , on the basis of analyzing and comparing the macroscopic mechani-cal properties and microstructure of ECCs prepared by three aggregates ( i. e. , desert sand, quartz sand,and river sand) , the uniaxial compression tests of five groups of desert sand ECC specimens with differentsizes were carried out. The results show that at the same ratio of materials , the ECCs prepared entirely byusing desert sand have compressive , tensile , and flexural strength similar to that of the ECC prepared by the other two kinds of sand , in desert sand ECCs , fewer attachments and relatively complete morphology offiber surface are beneficial to its bridging effect;the uniaxial compression properties of ECC prepared en-tirely by using desert sand have size effect ; the expression of the relation between height-thickness ratioand compressive strength , and the stress-strain full curve model with dfferent height-thickness ratio are ingood agreement with the test results.
Subjects: Geosciences >> Geology submitted time 2022-12-20 Cooperative journals: 《干旱区研究》
Abstract：
The Tazhong-38th Corp Desert Highway, currently under construction, extends from the hinterland of Taklamakan Desert to its southeastern edge. Different degrees of wind and sand hazards are distributed along the whole route, posing serious threats to the construction, service, and maintenance of the desert highway. Based on remote sensing image interpretation and wind data analysis, the wind and sand environment characteristics and dune movement rules in different sections of the desert highway were assessed, and a corresponding sand hazard prevention system framework is proposed. Our analysis showed that the prevailing wind directions along the desert highway are NE, ENE, and E, and the frequency of sandy wind increases from 21.7% to 33.8%. The wind direction characteristic develops from sharp bimodal to blunt bimodal, and the wind and sand hazards gradually become more severe: the drift potential along the section ranges from 178.23 to 309.43 VU, the wind energy environment is low to medium, the resultant drift direction is between SW-WSW, and the wind direction variation rate is medium. The annual average dune movement speed is between 3.16 and 6.26 m.a-1 , and there are obvious spatial differences in dune movement speed and direction. The consistency between dune movement direction and the resultant drift direction is poor in some sections. Based on the above environmental characteristics of the desert highway sections, a sand control system for the desert highway, combining blocking and solidification, is proposed. The results of our study have practical application value in the development of prevention and mitigation measures for desert highway sand damage.
Subjects: Environmental Sciences, Resource Sciences >> Basic Disciplines of Environmental Science and Technology submitted time 2020-06-21 Cooperative journals: 《干旱区研究》
Abstract：以新疆S214省道沙害防治区段为背景，应用CFD（computational fluid dynamics）数值模拟方法分析了高立式芦苇沙障周围的风沙流场，结果表明： 高立式芦苇沙障周围流场可分为迎风侧减速区，上方加速区和背风侧恢复区，背风侧无明显涡流区生成，沙障间的合理间距与风速呈负相关。现场布置模式对20 m·s-1的风沙流有较好防护效果，低于此风速时，第二道沙障背风侧基本无恢复区生成，后两道沙障迎风侧积沙较多且紧贴沙障分布，压埋沙障速度较快。通过相贴原理优化沙障间距，可以充分发挥各道沙障的防护作用，有效抵御风沙流侵袭，适当延长沙障使用年限。根据前人观测数据、现场调查和数值模拟结果，建议研究区内高立式芦苇沙障间距宜为20～25 m。该研究结果可为研究区内高立式芦苇沙障的合理布置提供理论依据，也可为其他风沙防护工程的建设提供参考。
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