Studying wind-sand flow transportation and effect factors of typical valley in Bashang area of Hebei Province

several characteristics are obtained primarily involving:(1)Wind speed increased by degrees with increased height under the three different surface conditions including high-efficiency farmland

meadow and bosk

and vertical distributing correlated nearly with character of surface conditions;(2)Vertical distributing of transportation sediment was obviously different under the three different surface conditions

and the total sediment on high-efficiency farmland had a well relation with vertical height by a negative exponential function;(3)The particle-size distribution analysis of the windblown sediment collected from individual layers showed that the proportions of fine particles(diameter 0.10.075 mm) and silt and clay particles(diameter 0.075~0.019 mm) were very high and accounted for a considerable higher proportion over 80%

suggesting that the motion of sand particles near the surface is dominated by saltational fashion;(4)The total sediment correlated nearly with character of surface conditions and decreased with increased vegetative cover;(5)Environmental complications including meteorological and factitious factors had crucial efforts on wind-water erosion of typical valley.