Knowledge Resource Center for Ecological Environment in Arid Area
| 黑河地区不同下垫面的近地层相似性分析 | |
| 贺建林 | |
| 出版年 | 1993 |
| 学位类型 | 硕士 |
| 导师 | 王介民 |
| 学位授予单位 | 中国科学院寒区旱区环境与工程研究所 |
| 中文摘要 | 本文利用黑河地区三种下垫面的湍流观测资料，分析了不同下垫面近地层无量纲化垂直风速方差，温度方差和湿度方差的相似性，以及绿洲下垫面近地层各风速分量谱的峰值频率的相似性，分析结果表明，地形起伏或粗糙程度对垂直风速的统计特征影响很小。不同下垫面上近地层无量纲化垂直风速方差、温度方差和湿度方差的相似性均能较好地成立，各对应的方差相似性在不同下垫面上分别大致相同。同时，温度方差的相似性与温度方差的相似性也基本相同，由于某些原因，戈壁和沙漠两种下垫面上的湿度方差分别比绿洲上的结果要离散得多。垂直风速峰值频率的相似性与大多数文献的结果大致相同，但水平方向风速谱的峰值频率相似性与文献有一些差异，尤其是横向风速谱的峰值频率的结果差异较大，在理论上，本文利用相似性理论，假设在稳定层结大气中，垂直风速方差σ_w是高度Z的弱函数，推得了无量纲化垂直风速方差与稳定度Z/L（L为Monin-Obukhov长度）之间的函数关系。这个函数关系式可以解释稳定层结大气中无量纲化的垂直风速方差并非常数等观测事实。 |
| 英文摘要 | Based on the eddy observations over the three kinds of different underlying surface in Heihe area, Surface-layer similar investigation for vertical wind velocity variance, temperature variance and humidity variance of dimensionless have been conducted over the different underlying surface, also has that of peak frequency of wind component spectrum in Oasis. The results show terrain undulation or roughness play a less important role to the statistical characteristics of vertical wind velocity. Surface-layer similarity of the dimensionless variance of vertical wind velocity, temperature and humidity over different underlying surface accord better with Monin-Obukhov similarity, every corresponding dimensionless variance similarity is generally similar to that of different underlying surface, respectively. The similarly of humidity varlance is also elementary similar to that of temperature variance. Because of some reasons, the humidity variance of two kinds underlying surface in Gobi and Desert is scattered very much than that in Oasis, respectively. The similarity of the peak frequency of vertical velocity spectrum is generally similar to that of most literature, but that of horizontal wind velocity spectrum is some different to some literature, especially, that of cross-wind.Based on the similarity theory, the author has assiumed the vertical wind velocity variance σ_w is a feeble function of height z in the stable atmosphere, has infered to the function relationship of the dimensionless vertical wind velocity variance depend on the stability z/L (L is Monin-Obukhov longth). The function relationship may be used to explain many facts, for example, the dimensionless vertical wind velocity variance is not constant etc. in the stable atmosphere. |
| 中文关键词 | 近地层相似性 ; 方差 ; 峰值频率 |
| 英文关键词 | surface-layer similarity variance peak frequency |
| 语种 | 中文 |
| 国家 | 中国 |
| 来源机构 | 中国科学院西北生态环境资源研究院 |
| 资源类型 | 学位论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/286200 |
| 推荐引用方式 GB/T 7714 | 贺建林. 黑河地区不同下垫面的近地层相似性分析[D]. 中国科学院寒区旱区环境与工程研究所,1993. |
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