The fixed sandy dune and lowland among sandy dunes act as converge of material and species flow, and they are also the source of species diffusing.

固定沙丘和丘间低地是物质流和物种流的汇， 同时又是重要的物种扩散的源。

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Many natural phenomena and natural disasters have close relation with granular materials avalanche, i. e. sand dune development and movement, debris flow, snowslide and earthquake.

沙丘发育和前移、泥石流、雪崩、地震等诸多自然现象和自然灾害都与颗粒物质的崩塌有着紧密的联系。

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By the roadbed height proposed and the analysis of wind velocity flow field, the active sand dune zone should be kept between 1.

按风速流场分析所建议的路基高度为：流动沙丘区路基合理高度宜在1。

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