| 梯度法计算空气动力学粗糙度存在的问题 |
| |
| 引用本文： | 邱玉珺,吴风巨,刘志.梯度法计算空气动力学粗糙度存在的问题[J].南京气象学院学报,2010,33(6):697-702. |
| |
| 作者姓名： | 邱玉珺 吴风巨 刘志 |
| |
| 作者单位： | [1]南京信息工程大学中国气象局大气物理与大气环境重点开放实验室,江苏南京210044 [2]内蒙古苏尼特左旗气象局,内蒙古苏尼特左旗026000 |
| |
| 基金项目： | 国家自然科学基金资助项目，南京信息工程大学科研基金，江苏省青蓝工程资助项目 |
| |
| 摘 要： | 利用2009年春季内蒙古苏尼特左旗风速、空气温湿度的野外观测资料，用梯度法研究荒漠化草原区空气动力学粗糙度Z0时发现，Z0有明显的日、月分布规律。中性条件下，根据风速对Z0的不同影响可分为3个特征区。梯度法计算Zn有风速条件约束，只有在风速较大时计算的Z0真实可靠，确定可靠风速区域是正确应用梯度法计算Z0的关键。乙随风速值的增大成指数关系递减，可从指数函数的收敛性确定Z0。
|
| 关 键 词： | 风速对数廓线 粗糙度 摩擦风速 指数函数 |
Problem of the Gradient Method to Study Aerodynamic Roughness |
| |
| QIU Yu-jun,WU Feng-ju,LIU Zhi.Problem of the Gradient Method to Study Aerodynamic Roughness[J].Journal of Nanjing Institute of Meteorology,2010,33(6):697-702. |
| |
| Authors: | QIU Yu-jun WU Feng-ju LIU Zhi |
| |
| Institution: | 1. Key Laboratory of Atmospheric Physics ＆Environment of China Meteorological Administration,NUIST,Nanjing 210044,China; 2. Sonid Left Banner Meteorological Bureau,Sonid Left Banner 011300,China) |
| |
| Abstract: | Based on the observed wind velocity data, humidity and temperature data from April 20 to June 18,2009 in the Sonid Left Banner of Inner Mongolia, the aerodynamic roughness（ Z0 ） is studied and the gradient method calculated Z0 is discussed. The results show that Z0 has daily and monthly distribution characteristics obviously. Wind velocity has different effect on the Z0. When the wind field is under the neutral stability, there are 3 wind characteristic regions with different effect on Z0. Wind velocity is a constraint condition of the gradient method to study Z0. Only on the large wind velocity condition, the Zo calculated base on wind data is really reliable. Z0 is exponential descent with the wind velocity increasing. It can be determined by the exponential astringency. |
| |
| Keywords: | logarithmic velocity profile aerodynamic roughness friction velocity exponential function |
| 本文献已被 维普 万方数据 等数据库收录！ |
