【摘 要】
：
青藏铁路格尔木-拉萨段沿线地表松散沉积物广泛分布,为风沙活动的产生提供了丰富的物质来源。地表松散沉积物按成因分为现代风成沙,河流冲积物,古风成沙和洪积、湖积沉积物。粒度分析结果显示,格-拉段沿线风沙物质(沙丘沙、防沙体系积沙)样品(56个)平均粒径变化于1.29～3.25Φ之间,均值2.36Φ(0.19mm)。平均粒径在2～3Φ(0.25～0.125mm)之间的样品占总数的78.57%。粒度组成以
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青藏铁路格尔木-拉萨段沿线地表松散沉积物广泛分布,为风沙活动的产生提供了丰富的物质来源。地表松散沉积物按成因分为现代风成沙,河流冲积物,古风成沙和洪积、湖积沉积物。粒度分析结果显示,格-拉段沿线风沙物质(沙丘沙、防沙体系积沙)样品(56个)平均粒径变化于1.29～3.25Φ之间,均值2.36Φ(0.19mm)。平均粒径在2～3Φ(0.25～0.125mm)之间的样品占总数的78.57%。粒度组成以细沙为主(65.20%),其次是中沙(20.53%),0.5～0.1mm范围重量百分比在49.44%～9
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