桥梁对河流阻水影响的一个综合判别指标

A Comprehensive Discriminant Index of Water-blocking Influence from Bridge to River

针对桥梁对河流的阻水影响问题,基于河流能量观点提出了考虑河流能量与桥梁阻水比双因素的综合判别指标η,应用其讨论了山区河流和平原区河流修建桥梁对河流的阻水影响。结果表明:综合判别指标η可以有效地区分相同桥墩布置形式桥梁对不同类型河流的阻水影响;综合判别指标η可以指导桥墩在河流中的合理布置,有效减小桥梁对河流的阻水影响,与桥梁阻水比、单宽流量等指标在指导桥墩合理布置方面起到相同效果。该研究成果在一定程度上弥补了一般桥梁阻水比指标的不足。

According to water-blocking impact of the bridge to the river, a comprehensive discriminant index ηconsidering river energy and bridge water-blocking ratio is put forward based on river energy point, and the impact of building the bridge on the mountain and- plain rivers on river water-blocking is discussed. The results show that the comprehensive discriminant index η can effectively distin- guish the water-blocking impact of the bridge with same pier layout on the different types of rivers. The comprehensive discriminant in- dex η can guide the rational arrangement of piers in rivers, effectively reduce the impact of the bridge on the river＇ s water blocking, and play the same effect with bridge water blocking ratio, single-wide flow rate and other indicators in a reasonable arrangement of guide piers Research results can make up for the lack of the indicator of bridge water-blocking ratio to a certain extent.