当前位置: X-MOL 学术J. Hydroaul. Res. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Elucidating the importance of sediment avalanches in scour at obstacles
Journal of Hydraulic Research ( IF 2.3 ) Pub Date : 2021-04-01 , DOI: 10.1080/00221686.2020.1866694
Jorge Soto 1 , Oscar Link 2 , Wernher Brevis 3
Affiliation  

ABSTRACT

An experimental analysis of the dynamics of avalanches for different stages of development and turbulent flow conditions is introduced. Experiments were conducted in a laboratory flume using clear-water conditions and a video camera placed within an acrylic cylinder. The results of a proper orthogonal decomposition of the pre-processed image sequences highlighted the existence of two types of sand avalanches: Type I corresponding to a narrow and vertically long-advancing slide, and Type II characterized by an elongated and short-advancing pattern. Temporally speaking, sand avalanches were triggered aperiodically, resembling the behaviour of the horseshoe vortex system. The frequency of occurrence of avalanches decreased with time, while the estimated volume of mobilized sand increased in the same period. The sand slide magnitudes and associated inter-avalanche time were Log-Pearson 3 distributed. Sand avalanches are an important scour mechanism, which depending on the flow intensity contribute to about 40% to 60% of the scoured volume.



中文翻译:

阐明沉积物雪崩在障碍物冲刷中的重要性

摘要

介绍了不同发展阶段和湍流条件下雪崩动力学的实验分析。实验是在实验室水槽中使用清水条件和放置在丙烯酸圆柱体中的摄像机进行的。预处理图像序列的适当正交分解的结果突出了两种类型的沙崩的存在:I型对应于狭窄且垂直长推进的滑坡,II型以细长和短推进模式为特征。从时间上讲,沙崩是非周期性触发的,类似于马蹄涡系统的行为。雪崩的发生频率随着时间的推移而降低,而估计的流动沙子体积在同一时期增加。滑沙幅度和相关的雪崩间时间是 Log-Pearson 3 分布的。沙崩是一种重要的冲刷机制,根据流动强度,沙崩约占冲刷体积的 40% 至 60%。

更新日期:2021-04-01
down
wechat
bug