Effect of Sandbag Barrier on Surface Particle Size of Sand Dunes

As a new kind of sand-fixing material,PLA fiber is used to form sandbag barrier by filling with sand and setting these cylindrical sandbags on the sand dunes,which can change the near-surface sand flow structure,surface roughness and other factors effectively.In order to understand the influence of PLA sand barrier on surface particle size of sand dunes,soil samples from 0 to 11 cm have been taken in dunes laid with sand barriers and the control dune,and the average particle size has been measured with Rise-2008 laser particle size analyser for contrasting the difference of average particle size between PLA sand barrier in different specification and position and the control dune.The results show that comparing the PLA sand barriers in 1 m×1 m,2 m×2 m and 3 m×3 m,the smaller the average particle size is,the higher the specification of PLA sand barrier is,which is bigger than the control dune obviously(p0.005).The averge particle size in windward slope,slope top and leeward slop laid sand barriers are 11.4%,26.8% and 1.8% higher than the control dune seperately.The average particle size in slope top is the highest,the one in windward slope is the second and the one in leeward slope is the lowest,which the trend is consistent with the control.