Obstacle-Reynolds-number based analysis of local scour at submerged cylinders
Obstacle-Reynolds-number based analysis of local scour at submerged cylinders
复制标题
DOI：
10.1080/00221686.2010.547719
复制
发表时间：
2011-04
影响因子：
2.3
通讯作者：
T. Euler;J. Herget
中科院分区：
文献类型：
--
作者：
T. Euler;J. Herget
本文开发并验证了一种简单的基于过程的分析方法，以确定河流环境中障碍物的局部冲刷。它基于障碍物雷诺数和弗劳德数。进行了清水水槽实验，以研究粗均匀砂中浸没圆柱体的局部冲刷深度。由此产生的冲刷深度与分析模型相关，并通过浸没和浮出的圆筒的局部冲刷的两个数据集进行验证。相对于平均流速的投影正面障碍物面积的大小对冲刷坑的形状和深度有显着影响。导出的幂律函数令人满意地描述了当前的冲刷深度数据。该方法仅限于近平衡清水冲刷、均匀沉积并排除颗粒密度影响。
A simple process-based, analytical approach is developed and validated herein to determine the local scour at obstacles in the fluvial environment. It is based on the obstacle Reynolds and Froude numbers. Clear-water flume experiments were conducted to investigate the local scour depths at submerged cylinders in coarse uniform sand. The resulting scour depths were correlated with an analytical model and validated with two data sets on local scour at submerged and emergent cylinders. The size of the projected frontal obstacle area in relation to the mean flow velocity has a significant effect on the scour hole shape and depth. A power law function is derived that satisfactorily describes the present scour depth data. The approach is limited to near-equilibrium clear-water scour, uniform sediment and excludes particle density effects.