Open AccessInfluence of local zero-plane displacement on effective aerodynamic parameters over heterogeneous terrain
Author(s) -
Zhong Shi,
Xiguang Yang,
Weidong Guo
Publication year - 2013
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.62.144212
Subject(s) - displacement (psychology) , plane (geometry) , zero (linguistics) , terrain , surface finish , surface roughness , planar , physics , materials science , geometry , mathematics , computer science , psychology , linguistics , philosophy , psychotherapist , ecology , computer graphics (images) , quantum mechanics , composite material , biology
In this paper, we investigate the statistical features of the influences of local zero-plane displacement on effective roughness length and effective zero-plane displacement for three surface categories, with a so-called joint calculation scheme for effective aerodynamic parameters over heterogeneous terrain proposed by Zhong et al. [Zhong Z, Lu W, Song S and Zhang Y 2011 J. Hydrometeor. 12 1610]. The local zero-plane displacement is found to magnify the effective roughness length. However, such a magnification effect tends to decrease as the roughness step increases. On the other hand, the effective zero-plane displacement increases as local zero-plane displacement increasing, though it is always less than the area-weighted linear average of the local zero-plane displacement. However, the effective zero-plane displacement tends to decrease with the roughness step increasing.