The scour around the Chindwin River bridge piers, the stability of fairway at the bridge crossing and impacts on the navigable conditions are analyzed in order to forecast the maximum scour around the piers and try to apply the conclusions to the bridge construction in Myanmar in the future. HEC-RAS model is used to undertake a study of flow behavior and the scour impact in the channel with particular interest in flow characteristics at the bridge opening. Output from the model is used to compare scour estimates. A comparison of the simulated model results with the observed field measurements is done. The one-dimensional model simulates relatively well using the same roughness values as used for the higher flows. The simulated water surface is consistent with those surveyed in the field. Results show that the HEC-RAS prediction scour depths are reasonable with the measured value.%对缅甸宛江桥桥墩周围的冲刷、桥梁通车时的稳定性及其对通航条件的影响进行分析.HEC-RAS模型用来对河道中的水流状况尤其是在桥正常运营时航道内的水流条件进行实际分析,旨在预测桥墩周围可能发生的最大冲刷,并将结论用于缅甸将来的桥梁建设事业之中.模型计算的结果与实测冲刷作了比较,在急流时,使用相同糙率的情况下,一维数值模拟得较好,数值模拟得到的水位与观测的结果一致,表明HEC-RAS模型预测冲刷深度是可行的.
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