Roughness lengths of roughness sub-layers over beds with artificial standing vegetation
Physical implication of roughness sub-layer over roughness surface has seldom been discussed specifically. Using a wind profiler with ten Pitotstatic probes at ten heights above the floor of a wind tunnel, we respectively determined wind gradients of roughness and inertia sub-layers over beds with compact and porous elements. For beds with compact elements, aerodynamic roughness lengths of sub-layers increase linearly from 0.07 mm to 30.74 mm with artificial standing vegetations height and lateral cover while those of inertia sub-layer are scattered. For beds with porous elements, aerodynamic roughness of sub-layer increase from 0.92 mm to 4.91 mm with decrease of porosity of individual element from 0.75 to 0.15, and larger than those of those of inertia sub-layer. Aerodynamic roughness of sub-layer reflects effect of such geometric properties as height, lateral cover and porosity on airflow.
Aerodynamic roughness length Roughness sub-layer Inertia sub-layer Momentum vegetation
F.M.Mei S.S.Jiang T.Wang
School of Environmental and Chemical engineering, Xian Polytechnic University, Xian,China Key Labo School of Environmental and Chemical engineering, Xian Polytechnic University, Xian,China Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Re
国际会议
西安
英文
537-542
2009-07-11（万方平台首次上网日期，不代表论文的发表时间）