中线南水北调孤柏嘴穿黄渡槽长度论证

Length Discusson of Gubaizui Aqueduct Bridge of Drawing Water from the Yangtze River into the Yellow the through the Middle Line

穿黄渡槽长度是渡槽设计中极其重要的指标，对工程量和投资影响极大。本文结合穿黄河段的实际情况，根据黄河下游实测资料分析、动床物理模型试验、数学模型计算等方面的成果，分析研究了穿黄渡槽缩窄河道后对穿黄河段洪水演进、泥沙冲淤及河势等可能产生的影响，并进行了槽孔水力计算。在此基础上，经综合比较，确定孤柏嘴穿黄波相长度为3500m，既满足了黄河行洪排沙的要求，又节减了穿黄渡槽的工程量和投资。

Length of the aqueduct bridge across the Yellow River is a very important index for aqueduct bridge design,and it influence significanily the project quantity and investrnent .According to the analysis of actual data of the lower Yellow River, the' research achievements of movable river bed experiments and mathmetic models, taking the actual conditions of the aqueduct into consideration, the influences of the aqueduct narrowed the river channel on the flood transmission in the relative Yellow River reaches,siltation and erosion,and the river regime, and others are studied in the paper,and the hydraulic calculation has been taken for the aqueduct bridge holes. On the basis and after comprehensive comparison, length of Gubaizui aqueduct bridge across the Yellow River of is decided as 3,500 meters,which not only meets the requirement for the Yellow River flood bosmission and sedAnent delivery, but also decrease the project quantity and investment.