波状涌潮在变化地形上的水动力研究

本文采用非静压单相流模型（NHWAVE）研究了波状涌潮在变化地形上的传播演变特性。通过设置合理的计算工况，系统分析了涌潮高度、潮前水深和斜坡坡度对波状涌潮水动力特性的影响。计算结果表明，涌潮高度和潮前水深对波状涌潮在变化地形上的水动力特性影响显著，不同的地形坡度对波状涌潮水动力特性影响较小。变化地形的存在可导致涌潮高度显著增大，引起沿程最大水位的剧烈变化，并且使涌潮传播速度降低。随涌潮高度的逐渐增加，斜坡前后潮差持续增大，同时表层速度与水深平均速度均呈现增大趋势。当增加潮前水深时，斜坡前后潮差减小，表层速度与水深平均速度单调递减。本文研究成果对于正确认识波状涌潮在变化地形上的传播演变规律有一定的参考意义，为波状涌潮河段涉水建筑物的工程设计及安全评估提供了科学依据。

Study on the hydrodynamics of undular tidal bore over the uneven seabed

In this study, hydrodynamic characteristics of transformation and breaking processes of the undular tidal bore on the uneven seabed have been numerically investigated by applying a nonhydrostatic numerical wave model (NHWAVE). Effects of tidal bore height, initial water depth and bed slope on the hydrodynamics of tidal bore are discussed in detail. Research findings indicates that the tidal bore height and initial water depth have significant effects on the transformation and breaking processes of the undular tidal bore on the uneven seabed. However, different bed slope on the undular tidal bore hydrodynamic characteristics of the influence of less. The existence of bed slope can lead to a significant increase in the height of the undular tidal bore, causing dramatic changes in the maximum water level along the range, and make the tidal bore propagation speed is reduced. The average speed of water depth tends to increase with the tidal bore height, as well as the height difference between the upstream and downstream tidal bore height. When increasing the water depth, the tidal difference between the upstream and downstream tidal bore height decreases, and the surface velocity decreases monotonically with the average velocity of water depth. The research findings drawn from this study can have certain reference significances for the accurate understanding of the hydrodynamics of tidal bore on the uneven seabed. It provides a scientific basis for the engineering design and safety assessment of wading buildings in the tidal river section.