Debris Accumulation at Bridge Crossings: Laboratory and Field Studies
Debris Accumulation at Bridge Crossings: Laboratory and Field Studies
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桥梁交叉口的碎片堆积：实验室和现场研究
DOI：
10.5703/1288284313171
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
Lyn Dennis
中科院分区：
文献类型：
--
作者：
D. Lyn;T. Cooper;Y. Yi;R. Sinha;A. Rao;Lyn Dennis
在印第安纳州的几个桥梁交叉口，桥墩处大量堆积的大型木质残体构成了一个长期的、有时相当严重的问题。这项研究涉及实验室和实地两个部分，审查了促成这种碎片堆的形成和发展的因素。实验室研究是在一个矩形水道中进行的，该水道有一个单一的模型桥墩（在某些情况下，上游有一个垂直圆柱体，模拟碎片偏转器，以及一个模型沙洲），并将销钉和细枝作为模型记录，研究考虑了速度和深度的影响。实验表明，局部深度的影响比预期的要大，局部深度越小，碎片积聚的可能性一般越大。实地研究包括视频监测和记录两个地点的碎片运输事件，即鳗鱼河的SR 59南渡（自2001年9月开始运营）和大朱砂河上的SR 63南行桥（自2003年4月开始运营）。在2001/2002年季节期间，仅在SR 59现场获得了重大流动事件期间的结果（图像），并且可以得出关于与重大流动事件相关的泥石流堆的开始和增长的一些定性结论。
Extensive accumulation of large woody debris at bridge piers poses a chronic and sometimes quite severe problem at several bridge crossings in Indiana. This study, involving both laboratory and field components, examines the factors contributing to the initiation and development of such debris piles. The laboratory study, performed in a rectangular channel with a single model pier (and in some cases with an upstream vertical cylinder modeling a debris deflector, as well as a model sand bar) and both dowels and twigs as model logs, considered the effects of velocity and depth. The experiments point to a stronger than might be expected effect of local depth, with the potential for debris accumulation generally greater when the local depth is smaller. The field study consisted of video monitoring and recording of debris-transporting events at two sites, the SR59 south crossing of the Eel River (in operation since 9/2001), and the SR63 southbound bridge over the Big Vermillion River (in operation since 4/2003). Results (images) during significant flow events have only been obtained at the SR59 site during the 2001/2002 season, and some qualitative conclusions can be drawn regarding the initiation and growth of debris piles in relation to significant flow events.