感潮河道桥梁和码头工程群对行洪累积影响

以宁波甬江流域感潮河段所建工程群为研究对象,基于Delft3D数学模型开展了典型洪潮条件下桥梁和码头群对河道行洪的累积影响研究,对比分析单类工程群和两类工程群对河道洪水位和流速的影响。结果表明:桥梁和码头群对河道行洪存在累积影响,位置集中在宁波大学上游的甬江、奉化江和姚江河段;在两类工程群单独作用下均存在水位(流速)增加或减小的区域,桥梁和码头群的联合作用使得水位(流速)变化幅度更大,但不是两类工程群影响幅度的简单叠加;在两类工程群单独作用下水位(流速)变化相反的区域,桥梁和码头群的联合作用下水位(流速)的变化幅度减小。

Cumulative influence of bridge and wharf engineering groups on flood propagation in tidal rivers

Taking the engineering groups built in tidal reaches of the Yongjiang River Basin in Ningbo City as an example, the cumulative influence of bridge and wharf groups on flood propagation under typical flood and tidal conditions was studied based on the numerical model of Delft3D. The results of the influence of a single type and two types of engineering groups on flood level and flow velocity were contrastively analyzed. The results show that bridge and wharf groups have a cumulative influence on flood propagation, which is located in the reaches of the Yongjiang River upstream of Ningbo University, the Fenghua River and the Yao River. In the region of water level (velocity) both increase or decrease by the single type of bridge or wharf groups, the water level (velocity) has a higher variation amplitude by the combined action of bridge and wharf groups, but the changed value is not a simple superposition of the influence amplitude of two engineering groups. In the region of water level (velocity) changes in opposite by the single type of bridge and wharf groups, the variation amplitude of water level (velocity) is reduced by the combined action of bridge and wharf groups.