中文摘要：

钱江通道位于钱塘江河口的强涌潮区域,在洪潮水动力作用下河床冲淤剧烈。极端水动力作用下河床的冲刷深度是过江隧道工程建设的关键技术问题之一。本文基于河床演变分析、动床数值模拟、动床物理模型试验、沉积物分析等手段进行研究。首先建立了钱江通道过江隧道河段洪、潮水流冲刷深度的预测模型,经钱塘江河口的实测地形、水流泥沙及河床冲淤等资料的验证。在此基础上预测了过江隧道断面在极端水动力作用下最大冲刷深度,并与沉积物分析方法进行比较,四种研究方法所得的结果定性定量基本合理,进一步表明了预测模型的可靠性,预测的最大冲刷深度可为过江隧道的合理埋设提供参考依据。

英文摘要：

The Qiantang tunnel locates in the river reach with strong Qiantang bore.The sedimentation/scouring range in this reach usually reached 5 to 10 m under the action of the flood and tidal flows.The river bed scour depth is one of the key technical problems for the tunnel project across the Qiantang Estuary.In the paper,four prediction methods for the maximum scour depth of the river bed at the tunnel are set up based on the analysis of the hydraulic geometry of river channel,method of sedimentology,sediment mathematical model and movable bed physical model.These models have been calibrated using hydrographic field data as well as data on historical morphological changes in the Qiantang Estuary.After the calibration these models have been applied to investigate the maximum scour depth caused by the strong water flow in the cross section of the Qianjiang tunnel across the Qiantang Estuary.Finally,the paper presents the maximum scour depth and scour curve of the river bed at the tunnel section under the 100-yr flood/tide flow according to the results from four prediction methods,and the predicted results agree very well with each other.It shows that the predicted results are basically reasonable and offer a scientific basis of the layout of the tunnel.