摘要
通过R/S分析证实了风洞中风场的风速时程具有分形特性,并计算了在风洞中模拟的地面粗糙度类别为A,B,C,D四类风场的盒维数,发现风场的分维数与风场类别存在着对应关系。在实际中可以根据风场的分数维初步判定风场的类别。风场的分数维可以反映相应的地面状况或周围建筑物的密集程度,即风场分维数能反映相应的地面地貌状况。
This paper proves that the time history of wind speed in wind tunnel has the fractal characterization through R/S analysis, calculates the box-counting dimension of four kinds of simulated wind fields with different land surface roughness A, B, C, D, and discovers that there is a corresponding relationship between fractal dimension and the type of wind field. In practical application, the category of wind fields can be determined preliminarily according to the fractal dimension. The fractal dimension of wind field can reflect the corresponding conditions on the ground or the intensity of the surrounding structures. That is, the fractal dimension of the wind field can reflect corresponding landform condition of the ground.
出处
《自然灾害学报》
CSCD
北大核心
2014年第1期32-38,共7页
Journal of Natural Disasters
基金
国家自然科学基金资助(91215302
51178180
51278190)
关键词
风洞
风场
地貌
分形
盒维数
wind tunnel
wind field
landform
fractal
box-counting dimension
