Improvement of an Aerodynamic Roughness Model With Meteorological Measurements and TM Image
文献类型：会议论文
| 作者 | Zhou Y. L. ; Sun X. M. ; Ju W. M. |
| 出版日期 | 2009 |
| 关键词 | aerodynamic roughness footprint TM image drag coefficient energy fluxes |
| 页码 | 781-785 |
| 英文摘要 | Aerodynamic roughness length (z(0)) is one of the main parameters for describing aerodynamic characteristics and turbulence exchange of underlying surfaces. It also plays a very important role in land surface fluxes simulation and atmospheric boundary layer studies. In fluxes and atmospheric numerical simulation models, z(0) is usually considered as a simple parameter related to rough elements, while actually z(0) is the result of aerodynamic and thermal factors and rough elements. Some researchers on z(0) established a model to calculate effective roughness at TM pixel scale. But in the model, the length of the fetch is simply considered as 100 times of the highest measuring height, which results in much uncertainty of the model. With the development of eddy covariance observations and the footprint theory, fetch could be determined with more accurate footprint model. This paper aims to make an improvement for the model basing on footprint model, and clarify the relationship between z(0) and air temperature, wind speed and geometric roughness. Firstly meteorological data in two different levels was obtained to calculate z(0) and the calculated z(0) was considered as the real value, and then the fetch length was calculated by FSAM footprint model. Secondly LAI was retrieved from TM image to calculate geometric roughness. Thirdly drag coefficient was taken into the roughness calculation model, and then a roughness calculation model was established with footprint model and LAI, vegetation height, atmospheric stratifications and drag coefficient. The result indicated that z(0) is the function of thermal and aerodynamic factors, and the reason for roughness dynamic was interpreted thoroughly. The quantitative relationship between rough elements and aerodynamic and thermal factors is clarified, and a more accurate model for retrieving z(0) at TM pixel scale could be established with the fetch determined by footprint. |
| 收录类别 | CPCI |
| 会议录出版者 | Ieee |
| 语种 | 英语 |
| ISBN号 | 978-1-4244-4562-2 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/25424]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Zhou Y. L.,Sun X. M.,Ju W. M.. Improvement of an Aerodynamic Roughness Model With Meteorological Measurements and TM Image[C]. 见:. |
入库方式： OAI收割
来源：地理科学与资源研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。