坝陵河大桥桥位深切峡谷风剖面实测研究

用相控阵声雷达风廓线仪对坝陵河大桥桥址处深切峡谷中风剖面进行了实地观测，结果表明：在地形复杂的山区深切峡谷中，平均风剖面受峡谷地形影响较大，形态有时显得较为复杂而不规则，呈现锯齿形、正切变形或逆切变形等多样化。在峡谷的上半部，平均风速较大时其剖面相对较为规则，但不符合规范中描述平坦地貌平均风速剖面的幂函数形式，而具有e指数函数的变化规律。此外，统计显示，风向角在低空范围内受峡谷地形的影响要比在高空范围内严重，其在低空范围的变化幅度也要比在高空范围的变化幅度大。风迎角的散布范围和绝对值大小均随高度的增加呈减小的趋势。观测得到的峡谷湍流度大于平坦地貌湍流度的规范推荐值，同时峡谷湍流度具有一定的随机性，并且这种随机性随高度的增加而变大。

Investigation on wind profiles in the deep gorge at the Balinghe bridge site via field measurement

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 eases 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 tend- encies 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.