Abstract
The construction of a river-crossing bridge will have an impact on the flow movement of the river section, which will bring adverse impact on flood control. In this paper, the influence of a planned bridge project on flood water level and flow field was analysed by using a two-dimensional mathematical model. The calculation results show that the construction of the bridge will cause backwater to the upstream of the bridge, resulting in the elevation of flood water level, thus bringing pressure to the use of flood control dam. At the same time, due to the squeezing effect of bridge piers on the flow, the flow velocity between piers and between piers and embankments on both sides will increase, which will bring adverse effects on the safe operation of the levee and pier.
Highlights
When a bridge crosses a river, piers are usually arranged in the river channel, which will cause the water level of the reach to rise and the local velocity will increase [1,2,3,4]
The study area is located in the main urban area of Nanchang City, of which the left bank is the embankment along the river, and the flood control standard of the dike is 100 year return period flood
The calculation results of two-dimensional mathematical model show that after the proposed bridge project is implemented, a little impact on the flow is brought, and the impact is mainly reflected as a raised water level in the upstream area of the proposed bridge, and the water level in the local area downstream of the piers is decreased
Summary
When a bridge crosses a river, piers are usually arranged in the river channel, which will cause the water level of the reach to rise and the local velocity will increase [1,2,3,4]. This will affect the flood control of the river reach where the bridge is located. The results can provide the optimization basis for the construction of the bridge in the province, and provide a reference for the urban flood control in Nanchang City
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