Wind-Sand Flow Structure and Its Variation under Different Surface Conditions in the Ulanbuh Desert
Wind-Sand flow structure and its variation of 0-40 cm in the mobile sand dune,semifixed dune and fixed dune of Ulanbuh desert are investigated.The results show as the followings:(1) 0-40 cm vertical height,total windblown sand flux increases with the increase of wind speed; total windblown sand flux of mobile sand dune is greater than total windblown sand flux of semifixed dune and fixed dune at different wind speed,presents decreasing function of exponential relation; (2) under the same wind velocity,0-40 cm vertical height,relative windblown sand fluxes of three types of surfaces present decreasing function of power relation with the increase of the height; (3) with the increase of the height,medium sand particles basically present decreasing trend,while fine sand particles increase,and the increase ranges are different under different surface conditions; (4) three types of different surface conditions near surface 0-10 cm layer of wind sand flow structure features of S values are less than 3.8,and λ value is greater than 1,indicating that three types of different surface conditions are in a state of wind erosion or transfer.
Ulanbuh desertwind-sand flow structurewindblown sand fluxparticle size distribution
国家科技期刊平台
NSTL
万方数据
维普
