Subjects: Geosciences >> Geography submitted time 2024-03-01 Cooperative journals: 《干旱区研究》
Abstract： In this article, using the parameters of hydrological, water resources, and the desertification area of theShiyang River basin in different periods, the basin hydrology, water resources, desertification, and its changes inthe relationship between them were quantitatively studied. It provides the data and the theoretical basis forhydrological, water resource features, and land desertification in this area. The research showed that although theprecipitation in the Shiyang River basin had increased from 2005 to 2021, the variability was large and remainedat a low level, with an average annual precipitation of only 234.70 mm. From 1993-2004, the annual precipitationat the Caiqi hydrological station reduced, whereas the annual sediment transport increased. The annualprecipitation at the Zamusi hydrological station increased from 1999 to 2021, whereas the annual sedimentdischarge decreased. From 2005 to 2021, the total amount of water resources in the Shiyang River basindecreased by 0.24×108 m3 ·a-1, but water consumption and water consumption remained at high levels of 24.70×108 m3 and 17.07 × 108 m3, with high water consumption and consumption in agriculture, forestry, and fruitindustries, exacerbating the irrationality of water resource utilization in the basin. From 1975 to 2014, the totalarea of desertified land in the basin reduced, but the land changes in different periods and desertification typesremained quite different, and the situation of desertification prevention and control in the basin was still grim.
Subjects: Geosciences >> Geography submitted time 2024-03-01 Cooperative journals: 《干旱区研究》
Abstract： The dynamic wind environment characteristics on the east and west sides of the Shashangou Bridgeused by the Dunge Railway were investigated using field observations, indoor analysis, and CFD numericalsimulations. The results show that the sand-driving winds on the east and west sides of Shashangou Bridge weremainly NW and WNW winds in the spring and summer, and SE and S winds in the autumn and winter. Theannual sand transport potential on the west side of Shashangou Bridge is 284.19 VU, which indicates a mediumwind energy environment. The sand transport potential was determined to be 27.4 VU, and the sand transportwith the wind direction was 124° . The directional variability index is 0.10, which indicates a small ratio andvariable wind direction. The sediment transport potential on the east side of Shashangou Bridge is 31.24 VU,indicating a low wind energy environment. The results of the sediment transport potential were 8.97 VU, whilethe results of the sediment transport wind direction were 91° , and the directional variability index was 0.29,indicating a medium ratio. The average wind speed, frequency of sand-driving wind, sand transport potential, andresultant sand transport potential on the west side of Shashangou Bridge were larger, indicating that themonitoring and control of sand damage on the west side of the bridge should be improved. According to thecharacteristics of the wind dynamic environment on the west side of the bridge when combined with the flowingdune, the numerical simulation analysis results show that the wind speed in the overhead area and bridge deck isgreater than the sand- driving wind speed, and the sand transport capacity was strong, indicating that sandaccumulation does not readily occur. However, with the advance of sand dunes, the possibility of sandaccumulation at the bottom of the bridge and wind sand on the rail increases.
Subjects: Geosciences >> Geology submitted time 2021-08-12 Cooperative journals: 《干旱区研究》
Abstract：玛曲县高寒草甸沙化是青藏高原地区发生沙化的典型案例，其成因、趋势和治理一直受到极大关注。利用三维激光扫描仪，结合野外监测和室内分析等方法，揭示了区域风沙环境，结合区域沉积物粒度与形态特征，依据沙物质来源复杂程度将沙化类型划分为风蚀坑沙化类型和复杂沙化类型。结果表明：区域全年输沙势为164.34VU，合成输沙势为91.57 VU，合成输沙方向132.37°，风向变率0.56，属于中比率低风能环境。综合风蚀坑沙化类型周边风蚀坑与积沙区的长度比、体积比、长轴线、与区域主风向吻合程度及沉积物粒度特征，可知风蚀坑是该沙化类型区域积沙的主要贡献者。在现代沙化过程中，复杂沙化类型除周边风蚀区、活化沙丘以及沙化草地等为区域积沙贡献沙物质外，黄河河道也为区域积沙提供一定量的沙物质。
Subjects: Geosciences >> Geography submitted time 2021-08-01 Cooperative journals: 《干旱区地理》
Abstract： 乌玛高速公路是《国家公路网规划》中内蒙古乌海至青海玛沁高速公路的简称，对宁夏自 治区沿黄经济带发展有着重要意义。通过野外观测和实地考察，对乌玛高速公路腾格里沙漠段风 能环境、沙丘类型、地表沉积物进行分析。研究表明：观测期间年平均风速 2.86 m·s-1，大于起沙风 年均风速为 6.23 m·s-1；起沙风以 5~9 m·s-1 为主，占比达 96.36%；主导风向为 NW-NNW 和 E-ESE。 沿公路自 NE 向 SW 方向，输沙势和最大可能输沙量呈减小趋势。公路两侧沙丘以流动沙丘为主， 沙丘类型包括格状沙丘和线性沙垄等。在风力作用下，格状沙丘主梁沿 NE-SW 延伸，沙丘高度自 NE 向 SW 方向呈增高趋势。公路沿线沙丘表层沉积物以中沙和细沙为主，分选性较好，偏度为正 偏或极正偏，中等和宽峰态分布。
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