一、绪论本文介绍的动床河工模型位于南非Zu-luland,跨越Umfolozi河,用于确定公路桥最佳桥位、桥孔长度以及桥墩位置。根据相似理论确定的模型比尺是正确而有效的。模型试验记录了冲刷深度与河床变形,清楚地显示出原来建议桥位的严重缺陷,试验确定了较好的桥位方案。把需要的桥孔长度从366米减少到213米,同时预测到可靠的冲 I. INTRODUCTION The moving bed and river model introduced in this paper is located in Zu-luland, South Africa, and crosses the Umfolozi River. It is used to determine the optimal bridge position, bridge hole length and bridge piers location of highway bridges. According to the similarity theory to determine the model scale is correct and effective. The model test records the erosion depth and riverbed deformation, clearly shows the serious defects of the proposed bridge position, and the experiment has determined a better bridge position scheme. The required length of the bridge from 366 meters to 213 meters, while predicting a reliable red