Laboratory Measurement of Sediment Transport under Dam-Break Waves Based on Image Analysis
Laboratory Measurement of Sediment Transport under Dam-Break Waves Based on Image Analysis
复制标题
基于图像分析的溃坝波浪下泥沙输送的实验室测量
DOI：
10.1142/9789814689977_0056
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Takenori Shimozono
中科院分区：
文献类型：
--
作者：
Lianhui Wu;Dejun Feng;Akio Okayasu;Takenori Shimozono
本文介绍了冲积带溃坝波作用下泥沙输运特性的一种新的实验室研究方法。这次冲刷事件是由斜坡海滩上的溃坝孔坍塌造成的。采用自主开发的输沙测量系统，分别基于粒子图像测速法（PIV）和消光法同时测量输沙浓度和输沙速度。浓度和速度数据相结合，得到具有高时空分辨率的泥沙通量。数据表明，在靠近砂层的初始上冲和后期上层由于再悬浮的反冲过程中，浓度最高。在整个流动过程中存在显著的床层荷载，而在上升过程中存在显著的悬浮荷载。
A new laboratory investigation of characteristics of sediment transport under dam-break waves in the swash zone is described. The swash event was produced by the collapse of a dam-break generated bore on a sloping beach. An originally developed sediment transport measurement system was applied to simultaneously measure sediment concentration and transport velocity based on particle image velocimetry (PIV) and a light extinction method respectively. Concentration and velocity data were combined to produce sediment flux with high temporal and spatial resolution. The data show that maximum concentration occurs during the initial uprush close to the sand bed and during the latter backwash in the upper layers due to re-suspension. Significant bed load exists throughout the flow period, while suspended load is remarkable during uprush.