关键词: 风沙, 湍流, 稳定分布, 分形, 标度律

Abstract: Based on the heterogeneity and intermittency of wind- sand turbulent flow. the relationships be tween the sand percent and the height are studied, and the formula M(h)∝h^-D is derived by the stable distribution theory, obtaining the fracbol dimensions D=2.36(h>10cm),D=1.465(h<10cm) as well as the velocity distribution W(|u|)=a₂|u|^(-D)/(2-1) the sand particle diffusiom<|x(t)|>∝t^2/D. According to the tra- veiling solutions of the Kdv-Burgers equation, the scaling law for wind-sand flow (υ/β)ξ+Dlnh=A is found. and it reveals the inherent relations among the dissipation υ, dispersion β, wind velocity ζ and height h. The starting radius of sand particle drived by wind turbulence is given by r_e=(c'/(5-D)ρ)[(β/υ)In(E₁/E₂)]^(5-D)/3 and the starting wind velocity V₁=V_2exp[(υ/2β)γ_c³ρ³(2.65/c')³] Finally, the multifractal charateristies of the wind-sand flow are discussed.