二维水动力学模型在商合杭铁路淮河大桥洪水影响评价中的应用

Application of Two-dimensional Hydrodynamic Model in Flood Impact Assessment of Shanghehang Railway

为分析商合杭铁路淮河大桥对淮河干流、寿西湖行洪区及董峰湖行洪区的行洪影响,基于MIKE 21软件建立淮河正阳关至峡山口段二维水动力学模型,选用非结构化三角形网格模型进行洪水演进模拟。确定该大桥修建后,虽干流主槽流速大小局部改变,但河段过流能力变化甚微,雍水影响有限,绕流滞流范围小,对河段行洪影响总体可控,为大桥设计提供了理论依据。

In order to analyze the impact of the Huaihe bridge of Shanghehang railway on the flood passage of Huaihe River mainstream, Shouxihu flood diversion area, Dongfenghu flood diversion area, this paper established a two-dimensional hydrodynamic model for the Huaihe River from Zhengyangguan to Xiashankou section, which was based on MIKE 21 software. It selected the unstructured triangle mesh model to simulate the flood routing. When it was decided to build the bridge, the flow velocity of the main channel in main stream changed topically, the flow capacity of the river section had hardly changed. The influence of hammed water on the river was limited, the range of flow around and viscous flow was small, and the impact on the river section flood was generally controllable, which could provide the theoretical basis for the bridge design.