Improving bridge afflux prediction for overbank flows
Improving bridge afflux prediction for overbank flows
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DOI：
10.1680/wama.2008.161.5.253
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发表时间：
2008-10
期刊：
影响因子：
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通讯作者：
G. Seckin;D. Knight;S. Atabay;N. Seçkin
中科院分区：
文献类型：
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作者：
G. Seckin;D. Knight;S. Atabay;N. Seçkin
通过复式槽道水槽试验研究了桥梁缩窄处的桥梁汇流现象。水槽在主槽和漫滩有不同的糙率配置。所有的试验都是在无偏心和入口无倒圆的条件下进行的。对不同拱腹类型和平腹类型的桥梁模型进行了正交试验（o = 0°）和两种不同斜交角（o = 30°和45°）的试验。对于每组实验，弗劳德数的正常深度，流入比和阻塞比（桥的面积低于水位总流量面积）的基础上开发的类比方法。对这些量进行了分析，得到了一个简单实用的流入方程。该流入方程也适用于美国地质调查局收集的现场数据，并与使用更复杂的方法，如HEC-2，WSPRO和USBPR获得的结果进行了比较。
Tests were carried out to investigate bridge afflux phenomena for bridge constrictions in a compound channel flume. The flume had different roughness configurations in the main channel and floodplains. All tests were undertaken for the condition of no eccentricity and no entrance rounding. The normal crossing (o = 0°) and two different skew angles (o = 30° and 45°) were tested for different arch and flat soffit type bridge models. For each set of experiments, the Froude number for normal depth, afflux ratio and blockage ratio (area of bridge below water level to total flow area) were obtained based on an analogical method developed previously. These quantities were analysed to obtain a simple practical afflux equation. This afflux equation was also applied to field data collected by the US Geological Survey and the results were compared with those obtained using the more complex methods such as HEC-2, WSPRO and USBPR.