关键词: 沙坡头, 阻沙, 格状沙丘, 防护带, 沙中, 孔隙度, 风沙流, 输沙量, 移速, 主风向

Abstract: The experiments of dune levelling around sandbreaks by fence technigues was conducted at the north side of the railway track in Shapotou Station. The observation in three windy seasons indicate that the major ridges of sand dunes move slowly; the moving speeds of the ridges is 0.56m/yr. which obtained by calculating the sand contents accumulated under the fences. The secondary ridges are main manifestation on the encroach and damage of sand dunes. It is possible and practical to levell sand accumulation around sandbreaks in Shapotou District by different fences made of various materials. The average sand contents under prevail wind is 6.5m³/m. width, yr.; the average sand contents stopped and accumulated under the fences is 5.5 m³/m. width.yr.; and 70-80% of shifting, sands were stopped by the fences i.e. only 20-30% of shifting sands were accumulated in the front area of sandbreaks.