An analytic expression for wind-velocity profile within the saltation layer |
| |
| Authors: | Z S Li J R Ni C Mendoza |
| |
| Institution: | a Department of Environmental Engineering, Peking University, Beijing, 100871, China;b The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing, 100871, China;c Department of Civil Engineering, University of Missouri, Rolla, MO 65409-0030, USA |
| |
| Abstract: | The vertical wind-velocity profile within the saltation layer is investigated theoretically. New equations for the fluid shear stress distribution in the saltation layer and the velocity profile affected by saltation are derived. The dependence of the velocity profile on the threshold shear velocity, the vertical variations of sand grain velocity, the vertical sand-mass-flux distribution, and the fluid shear stress within the saltation are demonstrated. Velocity profiles with or without Bagnold's focus are predicted. These velocity profiles are not very sensitive to the vertical distribution of sand-mass flux. Predicted velocity profiles are compared with profiles measured in the wind tunnel, and satisfactory agreement has been achieved. |
| |
| Keywords: | Wind-velocity profile Saltation layer Shear stress profile Analytic expression |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
