The Techiques Research On Highway Sand Hazard Precaution And Control In Shannan Region Of Tibet

Movement of sand and sand on the highway on the dangers of highway sand hazard control technology an important component part. Study on the technical line sandstorm physics, mathematical statistics for the basic tenets. Jiangbei Road in the sand to sand and control effectiveness research, for improving the operations of Jiangbei Road Shannan and the ecological environment has an important theoretical and practical significance.In this paper, using experimental and field positioning on the indoor wind tunnel experiment Jiangbei Road sandstorm disasters study drew the following conclusions:⑴.Different surface, the wind speed and load a power function, 0 ~ 40 cm layer of sediment exponential distribution function; roughness: laying grid Saudlant; 30% coverage of the Saudlant; Naked Sandland.⑵.In the bare sandy land near surface 2 m in height, wind speed with height was logarithmic function, and in the laying of grid sand and vegetation cover some of the sandy, wind speed with height exponentially function.⑶.Wind tunnel tests showed that: vegetation cover and erosion rate was exponential function, and the roughness of power function, vegetation height and roughness of a power function, vegetation cover under various wind speed and wind erosion rate was between nonlinear positive correlation function similar relationship for Q = a + bU2InU, roughness and wind erosion rate exponentially function.⑷.The restoration of vegetation roughness can be increased to improve the operations of highways, increasing vegetation cover, can inhibit the occurrence of wind erosion, the complete eradication of Highway Sand.⑸.With the reality on the ground, can be set up along the road in Jiangbei 52 m width of the protective zone.