【摘要】 通过对规划中的敦-格铁路沙山沟段两侧沙漠地貌的实地调查,发现沙山沟两侧形似高大复合型沙山的地貌,实为阿尔金山前洪积扇前缘的冲洪积、冲湖积平原受构造抬升后剥蚀而形成的剥蚀丘陵台地覆盖流沙所致。由于下伏地形十分稳定,因此,沙山沟两侧沙山不会发生整体移动,也就不会对敦-格铁路造成威胁。再结合气象资料计算了沙山沟的最大可能输沙量及输沙方向,结果表明,输沙方向与铁路基本平行,同时微地形造成的顺谷风有清沙和导沙的作用。最后分段讨论了该区域内可能存在的沙害及其影响,认为该地区风沙灾害可防可治,铁路可以通过,并且提出了防治沙害的有效措施。更多还原

【Abstract】 The field investigation to megadunes in the Shashangou section of Dunhuang-Golmud Railway disclosed that the megadunes are not composite Megadunes,but drift sand covered on denuded hills and platforms which are caused by the uplifting of the alluvial-pluvial fan ahead of Altyn Tagh Mountains.The subsurface terrains are steady,so the megadunes in the Shashangou will not move as a whole,thus its threat to the Dunhuang-Golmud Railway is negligible.The meteorological data are interpreted to calculate the maximum possible sand transport quantity and the maximum possible sand transporting direction.Results show that the sand transporting direction is parallel to the railway,and the wind brought by the micro-terrain can reduce the sand hazards.The possible aeolian-sand hazards are separately investigated.From the results,the authors believe that the intensity of the aeolian-sand hazards in this area can be controlled,and consequently,it’s safe for the railway to be built across the valley.Detailed suggestions are provided both qualitatively and quantitatively for setting up an effective sand controlling system.更多还原