The sand belongs to low porosity and permeability . The porosity distribution scope is 0.2% — 19.3%, is 6.79% in average, permeability distribution scope is 0.01 — 59.15×10~(-3) um~2, is 0.694×10~(-3)um~2 in average.
On sand packs of water permeability 0.156-2.53 μm 2 at 120℃ a water plugging rate ranged in 90-95% and a breakthrough pressure of 5.0 MPa/m are observed for low concentrated, 0.2-0.3%, polymer gel and 99.99% and 14 MPa/m, respectively, for high concentrated, 0.6%, polymer gel.
The variables studied were transport of sand, underlying surface roughness, windblown sediment, wind-sand flow structure, soil mechanical composition and amount of wind erosion.
The following conclusions were drawn: 1) The order of decreasing threshold of wind speed for sand displacement and surface roughness were forestland, wild grassland, farm land, sparse wild grassland and flood plain.
2) There were significant differences in sand flux among different ground covers.
At a height of 0-20 cm, the height increased while the sediment discharge percent of sand flux decreased; there were significant differences in the sand flow formation under different land-use types.
3) The mechanical composition of sand particles consisted mainly of silver sand in the flood plain and sparse wild grassland, and of silver sand, particle silver sand and floury sand in other land-use types.