原文传递
Velocity Fields in Near-Bottom and Boundary Layer Flows in Prebreaking Zone of a Solitary Wave Propagating over a 1:10 Slope
| 题名： | Velocity Fields in Near-Bottom and Boundary Layer Flows in Prebreaking Zone of a Solitary Wave Propagating over a 1:10 Slope |
| 其他题名： | Adrian,R.J.,and Westerweel,J.(2011).Particle image velocimetry,Cambridge University Press,New York. |
| 正文语种： | 英文 |
| 作者： | Chang Lin |
| 关键词： | Shoaling solitary wave;Boundary layer flow;Flow reversal;Overshooting;Run-up;Run-down;Hydraulic jump;Flow visualization technique (FVT);Particle image velocimetry (PIV);Similarity profile |
| 摘要： | The velocity characteristics of a solitary wave shoaling in the prebreaking zone and near the breaking point are investigated experimentally. The study focuses on the near-bottomand boundary layer flows on a 1:10 slope, with the incident wave steepness varying from 0.133 to 0.384.Both a flowvisualization technique (FVT) with thin-layered dye as well as particle image velocimetry (PIV) with a high-speed camera were used. Results fromFVT reveal that laminar boundary layer flow occurs not only in the prebreaking zone during the shoaling phases, but also in the postbreaking zone during the run-up and run-down phases. However, the laminar boundary layer disappears soon after breaking but before the runup motion, and immediately after the flow separation followed by hydraulic jump during the later stage of the run-down motion. Results from the PIV measurement show that the maximum horizontal velocity appears under the wave crest and increases during the shoaling process. Flow reversal is observed after the passage of the wave crest. Three unique similarity profiles are then obtained for the velocity distributions in the acceleration phases and in the layers of flow reversal with overshooting, as well as for the maximum onshore and offshore velocities in the boundary layer. In addition, the nondimensional time for the beginning of flowreversal at eachmeasuring section is found to be exponentially proportional to the dimensionless distance to the slope origin, but nearly independent of the incident wave steepness. This study also investigates the lead-time effects of the horizontal velocity at different heights in the boundary layer and at different measuring sections along the slope. The maximumvalue of the nondimensional lead time, occurring very close to the sloping bottom, decreases linearly with the dimensionless distance to the toe of the slope. |
| 出版年： | 2015 |
| 论文唯一标识： | P-108Y2015V141N03002 |
| 英文栏目名称： | Technical Papers |
| doi： | 10.1061/(ASCE)WW.1943-5460.0000269 |
| 期刊名称： | Journal of Waterway, Port, Coastal, and Ocean Engineering |
| 拼音刊名(出版物代码)： | P-108 |
| 卷： | 141 |
| 期： | 03 |
| 页码： | 1-30 |
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