A new nonlinear frequency-domain model based on the mild-slope equation is outlined. The model is an enhancement over previous work in that a closer correspondence between scaling of nonlinearity and horizontal variation of bathymetry is made relative to earlier models. This results in additional terms in the nonlinear summation terms of the model, as amplitude gradient terms are required in order to formulate a consistent model. From the resulting elliptic model, a parabolic approximation is developed in order to efficiently model the equations. Comparisons between the present model, previously-formulated models, and experimental data show that the present model does evidence improvement in performance over previous models.

概述了一种基于缓坡方程的新非线性频域模型。该模型是对以前工作的增强，因为相对于早期模型，非线性缩放和测深水平变化之间的对应关系更紧密。这会在模型的非线性求和项中产生附加项，因为需要振幅梯度项才能制定一致的模型。从得到的椭圆模型中，开发了抛物线近似，以便有效地对方程建模。当前模型、先前制定的模型和实验数据之间的比较表明，与以前的模型相比，当前模型确实在性能上有所改进。