卡口河段桥梁建设对河道行洪的影响——以渭河咸阳段为例

发布时间：2018-02-16 23:54

本文关键词： 河道行洪卡口河段桥梁建设数值模拟　出处：《水土保持研究》2017年06期 　论文类型：期刊论文

【摘要】：河流束窄处断面窄深,形成河道水沙输移的卡口,该区域行洪能力相对较弱,桥梁建设更加威胁河道防洪安全。以陇海铁路咸阳渭河桥改扩建工程为例,采用平面二维水流数学模型,研究了不同工程方案在3种洪水频率下对河道行洪的影响特征,结果表明:在桥梁建设期,四桥并存引起桥位处水位壅高值最大;疏浚量大的工程方案建设后过水面积增大更多,桥位水位降低幅度也相对较大,如工况1建设后300年一遇、100年一遇、5年一遇洪水下分别降低0.9m,0.9m,0.6m;卡口河段的桥梁建设宜结合适当的疏浚工程,以增加行洪河宽及过水面积,平顺水流,提升河道行洪能力。
[Abstract]:The narrow section at the narrow section of the river bundle forms a bayonet for river channel water and sediment transport. The flood discharge capacity in this area is relatively weak, and the bridge construction is more threatening to the flood control safety of the river. Taking the reconstruction and extension project of the Xianyang Weihe River Bridge of Longhai Railway as an example, By using two-dimensional plane flow mathematical model, the effects of different engineering schemes on river channel flood discharge under three flood frequencies are studied. The results show that in the period of bridge construction, the high water level at the bridge site caused by the coexistence of four bridges is the largest; After the construction of a project with a large amount of dredging, the area of overflowing water will increase more, and the water level of the bridge will also be reduced by a relatively large margin. For example, once in 300 years after construction, once in 100 years and once in 5 years, it is necessary to reduce 0.9mor 0.9mor 0.6m respectively under flood condition 1. The bridge construction of Kakou River should be combined with appropriate dredging works in order to increase the width and area of running Honghe River, smooth the water flow and enhance the flood discharge capacity of the channel.
【作者单位】：西北农林科技大学水土保持研究所;中国科学院水利部水土保持研究所;水利部黄河水利委员会黄河上中游管理局;
【基金】：西北农林科技大学博士科研启动基金“黄土丘陵沟壑区治沟造地工程对水系平衡的影响”(2452015337)
【分类号】：TV87;U442.3

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