新型ADV流速仪在桥墩模型试验中的应用

Application of Acoustic Doppler Velocimeter(ADV) in Bridge Pier Model Test

为了精确进行流速测量,对在建的马鞍山长江大桥桥墩概化水槽模型试验采用了新型声学多普勒流速仪(ADV)测量。通过开展桥墩模型试验,进行桥址断面概化和岸坡概化,重点观测桥墩附近水流变化及河床变形情况,了解桥墩周围河床的冲刷深度、冲刷范围,为工程设计和防护措施提供依据。研究表明:由于新型ADV测量范围大、速度快,可以测量瞬态流速、平均流速以及三维脉动流速分布,是一种测量精度高、功能全的流速测量仪器,在水流运动研究中将会得到越来越广泛的应用。

A new type of Acoustic Doppler Velocimeter（ADV） was applied to measure the flow rate accurately in a generalized pier model test tank for the Ma＇anshan Yangtze River Bridge which is under construction.The bridge site section and bank slope were generalized through the model test.Focused on changes in water flow observed near the piers as well as on the bed deformation,the test was to obtain the depth and the scope of riverbed erosion around the pier,and thereby providing basis for protective measures and engineering design.It was manifested that ADV could measure the distributions of instantaneous velocity,average velocity and three-dimensional fluctuating velocity as it measured rapidly in wide scope.It is a full-featured flow measuring instrument of high accuracy,and will be more widely used in the study of water movement.