Atmospheric turbulence which induced by wind shear and/or convection is non-uniform anisotropic flows of high Reynolds and Rayleigh number[1].According to the mechanism of turbulence generation,atmospheric boundary-la...Atmospheric turbulence which induced by wind shear and/or convection is non-uniform anisotropic flows of high Reynolds and Rayleigh number[1].According to the mechanism of turbulence generation,atmospheric boundary-layer stratification can be classified into neutral,unstable(convective)and stable[2].Observations show that sandstorms and wind-blown sand mostly occur under unstable stratifications from afternoon to early evening[3].As the surface absorbs the solar radiation,the surface temperature increases and vertical convection develops,which enhances the momentum exchange between the upper and lower layers and hence increases the near surface wind speed and shear stress[4].展开更多
基金supported by the State Key Program of National Natural Science Foundation of China(41931179)the Second Tibetan Plateau Scientific Expedition and Research Program(2019QZKK020109 and 2019QZKK020611)+4 种基金the Major Science and Technology Project of Gansu Province(21ZD4FA010)the National Natural Science Foundation of China(11772143)the Fundamental Research Funds for the Central Universities(lzujbky2020-cd06)Scientific and Technological Research and Development Plan of China Railway Urumqi Bureau Group Co.LTD(WLMQ-KGHZGS-HRTLGGB-2020-0031)the Youth Fund of PLA Rocket Force University of Engineering(2021QN-B029)。
文摘Atmospheric turbulence which induced by wind shear and/or convection is non-uniform anisotropic flows of high Reynolds and Rayleigh number[1].According to the mechanism of turbulence generation,atmospheric boundary-layer stratification can be classified into neutral,unstable(convective)and stable[2].Observations show that sandstorms and wind-blown sand mostly occur under unstable stratifications from afternoon to early evening[3].As the surface absorbs the solar radiation,the surface temperature increases and vertical convection develops,which enhances the momentum exchange between the upper and lower layers and hence increases the near surface wind speed and shear stress[4].
