The Bed Configuration Change by Interaction between Bridge Piers

초록

In this paper, the influence of the bed configuration by interaction between bridge piers is examined through the experiments in which 5 piers in the non-cohesive bed material in the experimental flume were installed. In the experiments the distance with the maximum distance of 25 times of the pier length and the maximum distortion width of 8 times of the pier width were utilized. Through the experimental studies, it was indicated that the bed configuration patterns are severely affected when the interaction between adjacent bridge piers exists. In the low flow, which can be characterized as low Froude number,the maximum bed configuration change is obtained when the piers are installed in the straight line in the flow direction without any distortion. However, in the high flow, which can be characterized as high Froude number, the maximum bed configuration change is obtained when the piers are installed with some distortion from the flow direction. The influence of the bed configuration by interaction between bridge piers is changed depending upon the Floude numbers, the length between piers, and the distortion width between adjacent bridge piers. The maximum scour depth increment of about 50% when the interaction between bridge piers exists is obtained compared to the single pier.