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Mechanisms of the formation of wind-blown sand hazards and the sand control measures in Gobi areas under extremely strong winds along the Lanzhou-Xinjiang high-speed railway 被引量:2
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作者 Jianjun QU Tao WANG +5 位作者 Qinghe NIU Benli LIU Lihai TAN Qingjie HAN Yang GAO Jianhua XIAO 《Science China Earth Sciences》 SCIE EI CAS CSCD 2023年第2期292-302,共11页
The Lanzhou-Xinjiang high-speed railway(HSR)traverses areas of the Gobi Desert where extremely strong winds are frequent.These strong winds cause sand/gravel hazards,an unaddressed issue that often seriously compromis... The Lanzhou-Xinjiang high-speed railway(HSR)traverses areas of the Gobi Desert where extremely strong winds are frequent.These strong winds cause sand/gravel hazards,an unaddressed issue that often seriously compromises the safe operation of the HSR.This paper studies the mechanisms leading to wind-blown sand hazards and the outcomes of sand control projects in these areas.The main findings are as follows:(1)Cold northern airflows over the Tian Shan mountain range are accelerated by the wind tunnels and downslope effect as they pass over complex terrain comprising passes,gullies,and proluvial fans.Consequently,the wind intensity often increases two-to threefold,creating frequent high-speed winds that lead to severe sand damage along the HSR.(2)In the Gobi areas with extremely strong winds,sand grains can be lifted as high as 9 m from the ground into the air,far higher than in other areas of the desert.The sand transport rate decreases exponentially with increasing height.Both wind speed and particle size determine saltation height.Coarser particles and stronger winds provide the particles with a higher kinetic energy as they collide with the ground.In the wind zones of Baili and Yandun,the analysed study areas,the saltation layer height of wind-blown sand/gravel exceeds 3 and 2 m,respectively.(3)Based on the above findings,recently emerging sand control materials,suitable for the areas of interest,were screened and developed.Furthermore,under the proposed principle of‘supplementing blocking with trapping’,a comprehensive sand control measure was established,featuring sandblocking belts comprised of multiple rows,and high,vertical sand-trapping installations with a large grids size.The installed system showed a high efficacy,reducing sand transport rate by 87.87%and significantly decreasing the deposition of sand along a trial section of the HSR. 展开更多
关键词 Gobi areas with extremely strong winds wind-blown sand hazards Complex terrain sand/gravel flow wind-blown sand control
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2种保水剂对北京南口风沙区侧柏成活及生长的影响 被引量:13
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作者 杨晓晖 张朝荣 +2 位作者 李国旗 马晨玉 慈龙骏 《林业科学研究》 CSCD 北大核心 2006年第2期235-240,共6页
以北京南口风沙区人工种植的侧柏苗为研究对象,对造林时施用2种保水剂及其剂量的处理与不同浇水量的对照处理进行了比较,结果表明:在造林初期,施用保水剂可使成活率达90%以上,与浇水量高1倍的对照相差无几,施用2种保水剂后第2年... 以北京南口风沙区人工种植的侧柏苗为研究对象,对造林时施用2种保水剂及其剂量的处理与不同浇水量的对照处理进行了比较,结果表明:在造林初期,施用保水剂可使成活率达90%以上,与浇水量高1倍的对照相差无几,施用2种保水剂后第2年春季土壤含水量比对照提高了84.7~119.4g·kg^-1,2种对照处理的保存率比保水剂处理的降低了7.78~25.56个百分点,从而降低了浇水和苗木补植所带来的成本;同时保水剂的施用也显著地提高了侧柏的初期生长量。研究中所选定的不同保水剂及其剂量对侧柏苗生长的影响差异并不显著。 展开更多
关键词 保水剂 侧柏苗 土壤水分 成活率及生长 北京南口
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