Variable Characteristics of Wind Profile of the Artificial Sand Dune in Sandy Land around the Qinghai Lake

Through the study of wind profile and sand flow in the sand area of the eastern shore of Qignhai Lake,which the technique of straw-checkerboard combining with sea-buckthorn seeding is experimented and promoted,it can be found that the low layers wind speed decreased obviously while high layers got increased in each position of artificial sand dune compared with the mobile dune.This is mainly due to the vertical change rates of the wind speed.Moreover,there is a surpass height which is higher at the foot of the slope and lower at the top between the artificial and mobile sand dunes,which leads to the better effects of wind prevention and sand fixation in the surface layer.Besides the difference of sand dune gradient,vegetation coverage and the average sand grain size have effects on the change of the wind profile.These results above will make a preliminary evaluation and provide basic guide to the management of desertification around the Qinghai Lake.