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应用生态学报 ›› 1991, Vol. 2 ›› Issue (2): 97-102.

• 研究论文 •    下一篇

通风结构林带背风面湍流相关特征初步分析

王政权, 宫伟光, 罗传文   

  1. 东北林业大学, 哈尔滨 150040
  • 收稿日期:1990-04-16 出版日期:1991-04-25 发布日期:1991-04-25
  • 基金资助:

    国家青年科学基金

Preliminary analysis of correlative characteristics of turbulence on leeward side of open windbreaks

Wang Zhengquan, Gong Weiguang, Luo Chuanwen   

  1. Northeast Forestry University, Harbin 150040
  • Received:1990-04-16 Online:1991-04-25 Published:1991-04-25

摘要: 本文根据湍流统计理论和野外观测数据,详细分析了林带背风面湍流自相关、空间相关和湍流积分尺度特征。在林带背风面的林缘附近,由于湍流尺度较小,使湍流相关系数不紧密。这时的时间尺度在2—3s(1.5m)和3—8s(5m),而空间尺度为10—20m左右。在远离林带以后,林带的作用减弱,随着湍流尺度增大,导致湍流相关系数增大。这时的时间尺度在15—20s,空间尺度在70—80m范围内,且湍流自相关系数服从2/3的指数定律。

关键词: 林带, 湍流相关, 湍流尺度, 湍涡

Abstract: In this paper, autocorrelation, space correlation, and integral scale of turbulence were discussed, using theory of turbulence statistics and field observation data. On leeward side of windbreaks, near X=1H-5H, turbulent correlations were not close due to the small scale of turbulence. The time scale of eddy is about 2—3 sec. (1.5m) and 3—8 sec. (5m), and space scale is 10—20m. The turbulence correlations were higher with the distance from windbreaks and the scale of turbulence increased. The time and space scale of eddies are about 15—20 sec. and 70—80m at the range X=20H-X=30H, respectively. Meanwhile, autocorrelation of turbulence confirmed the 2/3 power law.

Key words: Windbreaks, Turbulent correlation, Turbulent scale, Eddies