Prediction of erosion depth under the action of the exceptional flood in the river reach of a tunnel across the Qiantang estuary
Prediction of erosion depth under the action of the exceptional flood in the river reach of a tunnel across the Qiantang estuary
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发表时间：
2008
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通讯作者：
C. Ying
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作者：
C. Ying
钱塘江口是一个强烈的冲积河口，在洪水或潮汐流的作用下，沉积/侵蚀延伸通常达到5-10，因此河床侵蚀延伸是穿越钱塘江口隧道工程的关键技术问题。本文在分析河道水力几何、泥沙的基础上，建立了该隧道附近河床最大侵蚀深度的3种预测方法。 采用数学模型和移动床物理模型，利用水文实地数据和钱塘江口历史地貌变化数据对这些模型进行了标定，标定后用于研究特大洪水对钱塘江口隧道断面造成的最大冲刷深度，最终得到百年一遇洪水下隧道附近河床断面的最大冲刷深度和冲刷曲线。 采用三种预测方法进行预测，预测结果与地质钻探资料吻合较好，表明预测结果基本合理，为该隧道的研究提供了科学依据。
The Qiantang estuary is a strong alluvial estuary.The sedimentation/erosion extends usually reaches 5-10 under the action of the flood or tidal flow.So the riverbed erosion extend is the key technical problem for the tunnel project across the Qiantang estuary.In the paper,three prediction methods on the maximum erosion depth of the river bed nearby this tunnel are set up based on the analysis of the hydraulic geometry of river channel,the sediment mathematical model and the movable bed physical model.These models are calibrated using hydrographic field data as well as those on the historical morphological changes in the Qiantang estuary.After the calibration these models are used to investigate the maximum scour depth caused by an exceptional flood in the cross-section of a tunnel across the Qiantang estuary.Finally,the maximum erosion depth and erosion curve of the riverbed cross-section nearby the tunnel under the 100-year flood is predicted by the three predicting methods,and the predicted result agrees very well with the geologic drilling data.It is shown that the predicted result is basically reasonable and the scientific basis is offered for the study of this tunnel.