Field Investigation And Wind Tunnel Simulation Of Strong Wind Characteristics In Mountainous Regions

With the implementation of the strategic development of Western China, bridges in mountainous Regions and projects for the construction of large-scale structure are increasing day by day, and the research in the wind characteristics in mountainous Regions becomes the new hot spot in the Structural Wind Engineering. However, different from the condition in isotropic wind field in subdued topography, the complex topography in mountainous Regions will obviously change the wind-speed vertical distribution of wind flow in stratum and turbulent structures, and thus form a special ravine wind, over-mountain wind, and obscuring effects. Few studies have been carried out in this field. It is difficult for engineers to predict the problems in wind-induced response in mountainous Regions. Therefore, it is significant to study the wind-field characteristics in complex topography systematically.Combined with the projects of The Actual Measurement Based on Field Tests and Simulation of Inland Strong Wind and Its Effects from State Natural Science Funds Commission, this paper, adopting wind characteristics based on field tests and wind tunnel test, systematically investigates the parameter of the wind characteristics in mountainous Regions and its relationship:wind profile, turbulence number, turbulence integral scale, wind power spectrum and so on. Two aspects are studied.(1) The parameter of the wind characteristics and its relationship are obtained, using actual-measurement Stats by collecting the wind-observed data for a whole year of two typical complex wind fields in Xinjiang. The findings are as follows:①the index a in wind profile, with directional properties, is smaller than the normal value and the wind profile does not accord with the index-percent model because of the effects of the topography.②urbulent number is smaller than that in normal strong wind. The distribution of turbulent intensity is complicated because of the influence of the topography.(2) Wind tunnel test of topographical model is implemented. The contrastive analysis between the actual-measurement data and the test result proves the validity of the test method. The category of surface roughness is distinguished. Rules of the change of the wind characteristics are concluded. All provides reference materials for the future research in the wind characteristics in mountainous Regions.