Citation

Zhu LD, Ren PJ, Chen W, Zhou C, Wang JQ. Shiyan Liuti Lixue/Journal of Experiments in Fluid Mechanics 2011; 25(4): 15-21.

Copyright

(Copyright © 2011, Shi yan liu ti li xue bian ji wei yuan hui)

DOI

unavailable

PMID

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Abstract

Wind profiles in the deep gorge at the Balinghe bridge site were investigated via a field measurement using a phased array sodar wind profiler. It is found that the mean wind speed profiles in a deep gorge are seriously affected by the gorge terrain, and sometimes show complicated, irregular and diverse patterns, such as zigzag patterns, positive or negative shear patterns, etc. In the upper half part of the gorge, the mean wind speed profiles have relatively regular patterns in the relevant cases of large mean wind speeds. The regular profiles, however, are clearly different from the power law specified in codes for common flat terrains, and show variation patters of exponential law. Furthermore, the statistic results show that the wind azimuth is affected by the gorge terrain more significant in the lower part of the gorge than in the upper part of the gorge, and its variation amplitude is thus larger in the lower part than in the upper part of the gorge. Both the scattered range and the absolute value of the wind attack angle display decreasing tendencies with the increase of the height. The observed turbulent intensities in the gorge are larger than those suggested in the relevant codes for common flat terrains, and possess a certain degree of random, which is more violent with the increase of height.