active e sand dune 流动沙丘
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。
The result suggests that the sand dune is characterized by semi-active dune, the move speed is very slow, and all round the district desertification shows negative increase.
研究结果表明，区域沙丘属于半固定沙丘，移动速度缓慢，全区的沙化地总体表现为负增长。
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