从能量的角度出发,采用Hamilton描述并结合变分原理和摄动分析,并借助于符号运算导出了骑行在大波上的小波的Hamilton密度函数和非线性动力学方程。这里的大波和小波是对波高而言的。在Hamilton描述中,正则变量取为波高和速度势。本文导出了描述小波演化的二阶方程,在一阶近似下的方程与Henyey等人(1988)的结果一致。 From the energy point of view, using Hamilton description combined with variational principle and perturbation analysis, the Hamiltonian density function and nonlinear dynamic equations of the wavelet riding on large waves are derived by means of symbolic operation. Big waves and wavelets here are for wave height. In Hamilton’s description, regular variables are taken as wave heights and velocity potentials. In this paper, we derive the second-order equation that describes the evolution of the wavelet. The first-order approximation is consistent with the result of Henyey et al. (1988).