浅析拟建桥梁对河道泄洪的影响

The Influence of Planned Bridge on the River Channel Flood Discharging

本文描述了河槽一般冲刷、桥墩局部冲刷、水面线、能量水头损失等的计算理论,引入成温邛快速路金马河大桥这一工程实例,运用计算理论得出拟建跨河桥梁所引起的阻水总面积、桥位断面过水面积缩窄率、水位壅高值、水位降低值,以及河槽一般冲刷深度、桥墩局部冲刷深度、近岸流速的变化等;并由此分析拟建桥梁对河道泄洪及河势稳定的影响,最后得出拟建桥梁方案是否可行的的结论。

This article introduced the calculation theory of river channel general erosion, pier local erosion, water surface profile, energy head loss, and used this theory in the engineering practice of JinMaHe Bridge on Chengdu-Wunjiang express way, the calculation results included total area of water resistance, area contraction ratio, raising and lowering value of water level, river channel general erosion depth, pier local erosion depth and variation of nearshore flow velocity. With the above results, this article analyzed the influence of planned bridge on the river channel flood discharging, and then judged the feasibility of the planned bridge scheme.