When a river debouches into a shallow receiving basin, it behaves as a sediment-laden shallow jet which plays a key role in the subsequent sediment transport and morphological evolution at the river mouth. A linear stability analysis that directly incorporates the effect of the presence of suspended sediment on the hydrodynamic instability of shallow jets was performed in this study. The sediment effect was accounted for using a two-way coupling. The onset of the instability was found to be generally insensitive to the addition of moderate quantities of suspended sediment particles. However, an eigenfunction analysis indicated that the nonlinear development of the instabilities may indeed be affected by the presence of sediment. The results of this study have important implications for estuarine and deltaic geomorphology, and can inform delta restoration projects such as artificial diversion to achieve maximum land building potential.

当河流汇入浅层接收盆地时，它表现为一个充满泥沙的浅射流，在随后的河口输沙和形态演变中起着关键作用。本研究进行了线性稳定性分析，该分析直接结合了悬浮沉积物的存在对浅射流水动力不稳定性的影响。使用双向耦合考虑了沉积物效应。发现不稳定的开始通常对添加适量的悬浮沉积物颗粒不敏感。然而，本征函数分析表明，不稳定性的非线性发展可能确实受到沉积物存在的影响。该研究结果对河口和三角洲地貌具有重要意义，