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Characteristics of Undular Surges Propagating in Still Water
Feidong Zheng,Pingyi Wang,Jianfeng An,Yun Li 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.9
In this study, physical experiments were performed in a horizontal rectangular channel to investigate the evolution of undular surges that propagate in still water and the reflection of these surges on a vertical wall. The generated undular surges were located in the intermediate water depth wave regime. The results demonstrated that the maximum wave steepness attained by undular surges was close to the breaking limit of progressive waves at intermediate water depths. Nevertheless, the dispersion relationship was inconsistent with the wave dispersion trend for intermediate gravity waves and strongly depended on the initial flow conditions and surge type. Furthermore, it was found that the longitudinal current velocity was governed primarily by water surface displacement. A novel and universal formula based on the experimental results was proposed to describe the velocity distributions in different types of undular surge flows. In addition, a non-breaking undular surge behaved as a solitary wave regarding its reflection on a vertical wall. Overall, the findings highlighted the effects of the initial flow conditions on the hydrodynamic characteristics of undular surges and demonstrated the unique features of undular surges that propagate in still water.
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