Abstract: Sand cemented bodies (SCB) were extensively distributed in the hinterland of the Taklimakan Desert. In this study, the effects of SCB with different sizes on restraining aeolian erosion and windblown sand discharge were researched by wind tunnel simulation. Results showed that wind velocity and SCB size were the main factors affecting aeolian erosion. Under certain wind conditions, aeolian erosion restraint rate was decreased exponentially with the increase of SCB size. Under a certain SCB coverage, wind erosion rate was increased with the increase of wind velocity, and the bigger the SCB size was, the more obvious the increase trend of wind erosion with the increase of wind velocity would be. SCB size was the dominant factor affecting the surface windblown sand discharge, but not wind velocity. With the increase of SCB size, there was a rising process of sand grains on the SCB mulch bed, and the windblown sand discharge was increased with the increase of SCB size. The effect of SCB mulch bed in restraining the windblown sand discharge was mainly reflected by SCB density, and the lower the coverage was, the higher the windblown sand discharge would be. At the same SCB coverage, the distribution density and number of the large-sized SCB were lower than those of small-sized SCB. Therefore, the surface windblown sand discharge was relatively high. The restraint of SCB with different sizes to wind erosion and windblown sand discharge was in an order of 2-3 mm<3-5 mm<5-7 mm<7-10 mm<10 mm.

Key words: sand cemented body, particle size, aeolian erosion rate, windblown sand discharge, particle density