Laboratory study on wood accumulation probability at bridge piers
Laboratory study on wood accumulation probability at bridge piers
复制标题
桥墩木材堆积概率的室内研究
DOI：
--
复制
发表时间：
2020
影响因子：
2.3
通讯作者：
R. Boes
中科院分区：
文献类型：
--
作者：
I. Schalko;L. Schmocker;V. Weitbrecht;R. Boes
摘要河流基础设施，如桥梁，在洪水期间很容易积聚运输的大型木材（LW）。为了有助于改进风险评估，预测LW积累概率（AP）是至关重要的。以往的研究主要集中在桥面板的影响。在本研究中，进行了水槽实验，以研究桥墩处的LW AP，重点是（1）引流量条件，（2）不同桥墩粗糙度、形状、直径和桥墩数量的桥墩特性，（3）LW特性，包括各种原木长度、原木直径、原木密度、有分支和无分支的LW，以及非拥挤与（半）拥挤LW运输，（4）河床冲刷。实验结果表明，AP主要是来流流速和原木长度的函数。将计算结果组合成设计方程，用于预测工程应用中的风险评估。
ABSTRACT River infrastructures like bridges are prone to accumulations of transported large wood (LW) during floods. To contribute to an improved risk evaluation, the prediction of LW accumulation probability (AP) is crucial. Previous studies on LW AP focused mainly on the influence of a bridge deck. In the present study, flume experiments were conducted to investigate LW AP at bridge piers with special emphasis on (1) approach flow conditions, (2) bridge pier characteristics with different pier roughness, shape, diameter, and pier number, (3) LW characteristics, involving various log lengths, log diameter, log density, LW with and without branches, and uncongested versus (semi-) congested LW transport, and (4) channel bed, i.e. scour. Based on the experiments, AP is mainly a function of approach flow velocity and log length. The results were combined in a design equation to predict AP for risk assessment in engineering application.