Abstract: Incoming flow velocity profile is a key factor for controlling and influencing the sand flow field. Based on CFD unsteady model,in this study a numerical analysis of different incoming flow profile forms under specific roughness of underlying surface was carried out so as to explore the influence of incoming flow profile on wind speed and sand deposition. The results showed that the velocity partition of two incoming flow profile forms formed around the sand retaining wall. On the leeward side,the recirculation zone of uniform flow was not obvious,but that of logarithmic flow. On the windward side,a sudden velocity change of the uniform flow occurred,but the velocity of logarithmic flow was increased in a logarithmic law. The distribution of sand deposition around sand retaining wall under different incoming flow forms was different: sand deposition of uniform flow occurred only on the leeward side,but that of logarithmic flow occurred on both sides,and it was more serious on the windward side than on the leeward side. Sand deposition on the windward side was reduced but increased on the leeward side with the increase of incoming flow speed.

Key words: incoming flow profile form, wind velocity, aeolian sand deposition, sand retaining wall, numerical simulation