Cold pulses generated by the fission of internal solitary waves over gentle slopes are an important source of nutrients and relief from excess heat to benthic ecosystems. This numerical study investigates the effect of stratification form on pulses produced by fission of internal solitary waves propagating over a smooth, gentle, linear topographic slope in 2D simulations. Three stratification types are investigated, namely (i) thin tanh (homogeneous upper and lower layers separated by a thin pycnocline), (ii) surface stratification (linearly stratified layer overlaying a homogeneous lower layer) and (iii) broad tanh (continuous density gradient throughout the water column). Incident wave amplitude was varied. In the thin tanh stratification, good agreement is seen with past studies, whilst the dynamics observed in the surface stratification are very similar to those in the thin tanh stratification. However, in the broad tanh stratification, due to the different form of incident waves, the fission dynamics differ, but produce pulses similar in form to those produced by fission in the other stratifications. Pulse amplitude, wavelength and propagation velocity are found to strongly depend on incident wave amplitude, and each degenerate linearly as the pulse propagates upslope.

内部孤立波在缓坡上的裂变产生的冷脉冲是营养物质的重要来源，也是底栖生态系统从多余热量中解脱出来的重要来源。这项数值研究调查了分层形式对在二维模拟中在平滑、平缓、线性地形斜坡上传播的内部孤立波裂变产生的脉冲的影响。研究了三种分层类型，即（i）薄tanh（由薄厚跃层分隔的均匀上下层），（ii）表面分层（覆盖均匀下层的线性分层层）和（iii）宽tanh（连续密度梯度整个水柱）。入射波幅度变化。在薄 tanh 分层中，与过去的研究有很好的一致性，而在表面分层中观察到的动力学与在薄 tanh 分层中观察到的动力学非常相似。然而，在广义tanh分层中，由于入射波形式不同，裂变动力学不同，但产生的脉冲与其他分层中裂变产生的脉冲形式相似。发现脉冲幅度、波长和传播速度强烈依赖于入射波幅度，并且随着脉冲向上传播而线性退化。