| 零平面位移高度的Marquardt算法 |
| |
| 引用本文： | 刘小平,董治宝. 零平面位移高度的Marquardt算法[J]. 中国沙漠, 2002, 22(3): 233-236 |
| |
| 作者姓名： | 刘小平 董治宝 |
| |
| 作者单位： | 中国科学院 寒区旱区环境与工程研究所 风沙物理与工程实验室, 甘肃 兰州 730000 |
| |
| 基金项目： | 国家自然科学基金项目 (4 0 0 0 10 0 5 )，中国科学院“百人计划”项目资助 |
| |
| 摘 要： | 对数风速廓线中的零平面位移高度(d)是描述和估计地表粗糙元的空气动力学特征及其对地表风蚀抑制效应的重要参数之一。本文设计了用以计算对数风速廓线中非线性参数d的计算机非线性回归法——Marquardt法,并用砾质床面上风速廓线的风洞模拟实验资料加以验证。结果表明,用Marquardt法计算出的d/h(即d与砾石高度h之比)与砾质地表起伏度(Dv),d与风速(u)之间存都在较好的相关性,从而表明,Marquardt法是计算风速廓线非线性参数d的理想方法。
|
| 关 键 词： | Marquardt算法 零平面位移高度 |
| 文章编号： | 1000-694X(2002)03-0233-04 |
| 收稿时间： | 2001-05-30 |
| 修稿时间： | 2001-05-30 |
Estimating of Displacement Height Using Marquardt Method |
| |
| LIU Xiao-ping,DONG Zhi-bao. Estimating of Displacement Height Using Marquardt Method[J]. ournal of Desert Research, 2002, 22(3): 233-236 |
| |
| Authors: | LIU Xiao-ping DONG Zhi-bao |
| |
| Affiliation: | Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China |
| |
| Abstract: | The displacement height (d), which appears in the logarithmic velocity profile, is one of parameters that have been developed to express the response of ground surface and obstacles to airflow. This paper describes the application of the method for estimating zero-plane displacement based on experimental data from the gravel beds in wind tunnel. The results show that good correlation exits not only between the ratio of d to gravel height h and relief factor (D v ), but also between d and free-stream wind velocity. So, it is reliable to use this method to estimate the non-linear parameter d in the wind profile. |
| |
| Keywords: | wind velocity profile Marquardt method displacement height |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《中国沙漠》浏览原始摘要信息 |
|
点击此处可从《中国沙漠》下载全文 |
