Changes of the displacement height and roughness length of maize during a growing season
Changes of the displacement height and roughness length of maize during a growing season
复制标题
玉米生长季位移高度和粗糙度长度的变化
DOI：
10.1016/0168-1923(88)90066-4
复制
发表时间：
1988
影响因子：
6.2
通讯作者：
J. H. Boxel
中科院分区：
文献类型：
--
作者：
A. Jacobs;J. H. Boxel
研究了不同生长季节玉米作物的位移高度(d)和粗糙度长度（z0）的变化规律。进行了风廓线、理查德森梯度数和热动量湍流通量估算的测量程序。将测井剖面拟合技术和涡动相关技术相结合，获得了独特的dandz0值。在整个生长季节，位移高度与冠层高度(H)呈良好的相关关系（r= 0.98）。平均值ford/ h0.75。粗糙度长度与冠层高度和位移高度之差密切相关。平均值为0.26 forz0/(H−d) （r= 0.86）。如果比值/ h固定，粗糙度长度对风速和热稳定性没有明显的依赖性。
Variations in the displacement height (d) and roughness length (z0) of a maize crop were investigated through a growing season. A programme of measurement from which the wind profile, the Richardson gradient number and the turbulent fluxes of heat and momentum were estimated, was carried out.Two techniques were combined to obtain unique values fordandz0: the log-profile fitting technique and the eddy correlation technique. Throughout the growing season, the displacement height appeared to correlate very well (r= 0.98) with the height (H) of the canopy. A mean value ford/Hwas 0.75. The roughness length was strongly correlated with the difference between the canopy height and the displacement height. A mean value of 0.26 forz0/(H−d) was found (r= 0.86). If the ratiod/Hwas fixed, the roughness length did not show any clear dependence on wind speed or thermal stability.