The Study About Auxiliary Protective Technique Of Sand Barrier During Stumping Convalescence Of Salix Psammophila Protection Belt On Desert Crossing Highway

Surface and highway pavement would be easily damaged by wind erosion and sand burial during stumping convalescence of Salix psammophila protective belt on desert crossing highway.Therefore,the gauze sand barrier was set up for protection,and its mode of arrangement high limit sand resistance and sediment transport were explored.On the windward side of Salix psammophila protective belt,the gauze sand barrier was set at different angle and at different distance of Salix psammophila protective belt's windward side.The wind speed and sediment transport rate were observed and the roughness was analyzed in different modes.As the distance from gauze sand barrier to Salix psammophila protection belt varies,the result showed that the distribution of wind speed flow isoline was different.The isoline is the densest when the distance is 3 times than barrier height.In addition,the corresponding position with the maximum attenuation of wind speed is within the scope of Salix psammophila protective belt.And the maximum rate of wind speed reduction and recovery compared with the other two distance arrangements.Surface roughness within Salix psammophila protective belt is markedly increased and greater than open field(More than 7.33 times),and the best setting angle is 45°.The reduction of sediment transport rate decreases with the increase of the setting angle of the gauze sand barrier,and all of them are greater than 88.08%.The effect of control to wind sand flow on surface is the most obvious when the gauze sand barrier is 3 times than barrier height from Salix psammophila protective belt,and the average of transport rate was 89.14%.Above all,the optimum mode of arrangement gauze sand barrier should be set by the 3 times than barrier height and angle for 45°.