高海拔高温差深切峡谷桥址区日常大风成因

发布时间：2018-03-26 05:08

本文选题：深切峡谷　切入点：桥址区　出处：《西南交通大学学报》2014年06期

【摘要】：为探讨高海拔高温差深切峡谷桥址区日常大风的成因,采用CAW600-RT型四要素自动气象站、手持风速仪及便携式温度计,对大渡河大桥桥址区风特性进行实测,分析了桥位处平均风速与温度、日照及地形地貌等的相关性.结果表明:大渡河大桥位于高海拔高温差深切峡谷内,桥址区几乎每天下午起风,平均风速常达10 m/s以上;根据成因,桥位处的大风可分为2类,一类受大尺度大气环流影响,另一类受小尺度范围内热力驱动而产生日常大风,并受局部地形及随时间变化的日照的影响;桥位处日常大风出现的频率较高,虽不控制桥梁的设计基准风速,但影响桥梁的耐久性和行车舒适性.
[Abstract]:In order to probe into the causes of daily gale in the deep gorge site of high altitude and high temperature difference, the wind characteristics of the bridge site of Dadu River Bridge were measured by using CAW600-RT four-element automatic weather station, hand-held anemometer and portable thermometer. The correlation between average wind speed and temperature, sunshine, topography and geomorphology are analyzed. The results show that the Dadu River Bridge is located in a deep valley with high altitude and high temperature difference. The wind rises almost every afternoon in the bridge site area, and the average wind speed is often over 10 ms. According to the cause of formation, the gale at the bridge can be divided into two categories: one is influenced by the large-scale atmospheric circulation, the other is driven by the heat in the small scale, and the daily gale is caused by the local topography and the variation of sunshine with time. The frequency of daily gale in bridge is high. Although it does not control the design standard wind speed of bridge, it affects the durability and driving comfort of bridge.
【作者单位】：西南交通大学桥梁工程系;四川省交通运输厅公路规划勘察设计研究院;同济大学桥梁工程系;中国气象局公共气象服务中心;
【基金】：国家自然科学基金资助项目(U1334201) 交通运输部建设科技计划项目(2014318800240)
【分类号】：U442

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