大量跨河桥梁的兴建，使得天然河段变成了桥位河段。
The construction of a large number of river-crossing Bridges makes the natural reach turn into the bridge location reach.
文章分析了跨河桥梁对河道行洪、壅水、水流、冲淤等的影响，介绍了计算方法。
The article analyses the effects of crossing bridge on flood-flowing, resisted-water, water-stream and water-poured mud, an explanation of how to analyse and calculate them is given.
列出了国内进行防洪评价的依据，以及拟建跨河桥梁对河道防洪影响综合评价的内容；
Then the basis for evaluation of national flood control is given and the synthesized content of the flood control influence for the proposed bridge is discussed;
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