浅水区孤立墩上的非线性波浪力

The nonlinear wave force on a circular cylinder in shallow water

本文基于一阶近似椭圆余弦波理论研究了浅水区非线性波浪对圆柱墩的绕射作用,推得了计算绕射后圆柱墩周围的水面方程,从而得到墩柱面上波面的壅高值。文中也推导了作用于圆柱墩上的波浪力计算公式,并对工程中常遇到的波浪范围进行了计算,得到了非线性波浪力与线性波浪力的比值,并制成图供设计参考。

Based on the first order cnoidal wave theory, the nonlinear wave diffraction around a circular cylinder in shallow water is studied in this paper. The equation of the wave surface around the cylinder is formul- ated and by using this formula the wave surface elevation on the cylinder surface can be obtained. In this paper, the formula for calculating the cnoidal wave force on a circular cylinder is also derived. For the wave conditions which often occur in the practical engineering designs, the ratios of the nonlinear wave forces to the linear wave forces are calculated, and the results are plotted in diagrams presented in the paper for design purposes.