Abstract: The model was designed with 1:10 scale,and the testing wind velocity consist of 7.0 m·s^-1,10 m·s^-1and 15.0 m·s^-1.The structure of flow field was measured under wind only,then,the erosion deposition features were measured under sand-carrying wind flow.The results are as follows:(1) Near the 3 types obstacles of tight,sparse and air,there are some structural characteristics of retardant periptery before the body,lifting accelerating area just pass the top,back-flow area behind the body,and low-speed back-flow area on the surface behind the body.The tight and sparse sand bag obstacles have obvious sand-preventing effect.(2) The rulers of upright checkerboard sand barriers include 2.5 m×2.5 m,5 m×5 m,10 m×10 m.The sand-carrying wind speeds up gradually when it flows to the objects,and reachs the maximun over the first checkerboard;then,the speed decreases gradually resulted from the stopping function of the objects;the flow trends stable after 15~20 m course,and sands deposite evenly.The test proved that the double filmed sand bag obstacle and initial upright checkerboard sand barrier are effective for protecting all the facilities in sand-shifting desert areas.

Key words: double-filmed sand bag obstacle, upright checkerboard sand barrier, sand-controlling engineering, structure of flow field