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中文摘要：
为研究甬江上已建桥梁群对感潮河流防洪纳潮的影响，基于Delft3 D模型建立甬江二维非恒定流数学模型，并使用原型观测数据对模型进行参数率定和验证，开展典型洪水和潮汐条件下桥梁群对甬江水流流速和水位的影响研究。结果表明：单个桥梁对水流的影响主要在桥位近区，桥梁群因影响范围的重叠而产生累积影响，且增加了对水流的影响范围。通过不同洪水和潮汐条件下桥梁群对水流的影响比较发现，大潮小洪情况下桥梁群对甬江水流的影响较大洪小潮情况下更为明显。
英文摘要：
In order to study the effects of a group of bridges built across the Yongjiang River, a tidal river, on the flood and tide control of the river, a two-dimensional numerical model was established for the unsteady flow of the Yongjiang River based on the Delft3D model. The established model was calibrated and verified by the field observation data and used to study the influence of the group of bridges on the flow velocity and water level of the river under different flood and tide conditions. The results show that a single bridge has an effect on the flow near the bridge, while a group of bridges have a much greater accumulative influence on the flow velocity and water level and increase the influenced area. The effects of the bridges on water flow under different flood and tide conditions were compared. It was found that the effects of the bridges were more significant under the conditions of a spring tide and a small flood than under the conditions of a large flood and a neap tide.
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