强涌潮水流条件下直立圆柱体的涌潮作用力试验研究

Experimental Study on Tidal Bore Force of Vertical Cylinder Under Strong Tidal Bore

为厘清强涌潮河口直立式圆柱体受到的涌潮作用力与涌潮水流条件、圆柱直径的关系,通过涌潮水槽模型试验研究了三种直径直立圆柱在不同潮前水深、涌潮高度条件下的涌潮作用力。结果表明,强涌潮的涌潮作用力为直立圆柱受到冲击力叠加该时刻的水流绕流阻力、圆柱前后水位压差力。通过数据回归分析,得到了一个无量纲涌潮作用力计算公式。该公式表明,涌潮作用力分析计算除了要考虑涌潮高度、圆柱直径外,潮前水深也是关键因素,且涌潮作用力与圆柱直径之间存在显著的非线性关系。

To clarify the relationship between the tidal force acting on a vertical cylinder in a strong tidal estuary and the tidal flow conditions and cylinder diameter,a tidal bore flume model experiment was conducted to study the tidal force acting on three types of vertical cylinders with different pre tidal water depths and tidal bore heights.The results indicate that the tidal force of strong tidal bore is the sum of the impact force on the upright cylinder and the resistance of the water flow around it at that moment,as well as the pressure difference of the water level before and after the cylinder.A dimensionless tidal force calculation formula was obtained through data regression analysis.This formula indicates that the pre tidal water depth is also a key factor in the analysis and calculation of the tidal bore force besides considering the height of the tidal bore and the diameter of the cylinder,and there is a significant nonlinear relationship between the tidal bore force and the diameter of the cylinder.