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Experimental and numerical investigations of similarity for dam-break flows on wet bed
Journal of Hydrology ( IF 5.9 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.jhydrol.2020.124598
Bo Wang , Wenjun Liu , Wei Wang , Jianmin Zhang , Yunliang Chen , Yong Peng , Xin Liu , Sha Yang

Abstract The similarity brings great convenience to the description of the dam-break flows. The previous works mainly focus on the similarity of dam-break flows under the condition of dry bed downstream. In view of the fact that there is often a certain tail water depth in a river, this paper deals with both the gravity similarity and self-similarity of dam-break flows in a horizontal and smooth channel with a wet-bed downstream condition by using both physical and numerical models. In the laboratory tests, the digital image processing technique is adopted for flow measurement, providing water surface profiles, stage hydrographs and cross-sectional mean velocity. Three different upstream depths and ten water depth ratios α (i.e., the ratio of initial downstream water depth against the upstream water depth, ranging from 0.05 to 0.9) are considered. The numerical simulations on the vertical two-dimensional experiments are carried out using a computational fluid dynamics solver, providing velocity profiles in addition to the hydraulic parameters obtained in experiments. The following observations are made: (1) the water surface profiles, stage hydrographs, mean velocity distribution and horizontal velocity profiles are shown to satisfy the gravity similarity well; (2) the gravity similarity characteristic of the vertical velocity profiles in the reservoir performs better than that in the flooded area; (3) the water surface profiles, mean velocity distribution and horizontal velocity profiles approximately satisfy the self-similarity after a period of time for α

中文翻译:

湿床溃坝流相似性的实验与数值研究

摘要 这种相似性给溃坝流的描述带来了极大的方便。以前的工作主要集中在干床下游条件下溃坝流的相似性。鉴于河流中往往存在一定的尾水深度,本文利用湿床下游条件下水平光滑河道中溃坝水流的重力相似性和自相似性。物理模型和数值模型。在实验室测试中,采用数字图像处理技术进行流量测量,提供水面剖面、阶段水位线和横截面平均速度。考虑了三种不同的上游深度和十个水深比α(即初始下游水深与上游水深的比值,范围从0.05 到0.9)。垂直二维实验的数值模拟是使用计算流体动力学求解器进行的,除了在实验中获得的水力参数外,还提供速度剖面。得出以下观察结果: (1) 水面剖面、阶段水位线、平均速度分布和水平速度剖面均能很好地满足重力相似性;(2) 储层垂直速度剖面的重力相似性特征优于淹没区;(3) α 一段时间后,水面剖面、平均速度分布和水平速度剖面近似满足自相似性 除了在实验中获得的水力参数外,还提供速度剖面。得出以下观察结果: (1) 水面剖面、阶段水位线、平均速度分布和水平速度剖面均能很好地满足重力相似性;(2) 储层垂直速度剖面的重力相似性特征优于淹没区;(3) α一段时间后,水面剖面、平均速度分布和水平速度剖面近似满足自相似性 除了在实验中获得的水力参数外,还提供速度剖面。得出以下观察结果: (1) 水面剖面、阶段水位线、平均速度分布和水平速度剖面均能很好地满足重力相似性;(2) 储层垂直速度剖面的重力相似性特征优于淹没区;(3) α 一段时间后,水面剖面、平均速度分布和水平速度剖面近似满足自相似性 显示平均速度分布和水平速度剖面很好地满足重力相似性;(2) 水库垂直速度剖面的重力相似性特征优于淹没区;(3) α 一段时间后,水面剖面、平均速度分布和水平速度剖面近似满足自相似性 显示平均速度分布和水平速度剖面很好地满足重力相似性;(2) 储层垂直速度剖面的重力相似性特征优于淹没区;(3) α 一段时间后,水面剖面、平均速度分布和水平速度剖面近似满足自相似性
更新日期:2020-04-01
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