Using the method of process-oriented hydrodynamic modelling, this work investigates the dispersal of particles in stratified fluids on continental margins. The fundamental principle underlying this work is that particles can be upwelled across isopycnal surfaces, given that turbulent fluctuations do generally not offset the advective displacement of a particle. This principle is validated here with the diapycnal upslope sediment transport in a bottom Ekman layer that forms under a stratified geostrophic slope current. Similarly, this study indicates that the interaction between slope currents with a submarine channel can facilitate a continuous diapycnal upslope flux of particles, confined to the lowermost 10–20 m of the water column. Velocity anomalies that facilitate this upslope sediment flux are the signature of standing topographic Rossby waves that only develop for slope currents that are left-bounded (right-bounded) by shallower water in the northern (southern) hemisphere. Findings of sensitivity studies confirm the existence of up-channel flows for a wide range of parameter values. Under the assumption that particles remain suspended in the water column, the inclusion of gravitational settling significantly increases the up-channel sediment flux. Sediment settling operates to trap particles close to the seafloor within the core of bottom-intensified up-channel flow. The author postulates that this mechanism plays an important role in biogeochemical cycles at continental margins.

使用面向过程的流体动力学建模方法，这项工作研究了大陆边缘上分层流体中颗粒的扩散。这项工作的基本原理是，假设湍流涨落通常不会抵消颗粒的对流位移，则颗粒可以跨等高表面向上流动。在层状地转斜流作用下形成的底部埃克曼层中的斜向上坡沉积物输运证实了这一原理。同样，这项研究表明，斜流与海底通道之间的相互作用可以促进颗粒的连续的上斜向上通量，该通量被限制在水柱的最低10–20 m。促进这种上坡沉积物通量的速度异常是站立的地形Rossby波的特征，仅在北半球（南半球）的较浅水向左向（右向）倾斜的斜流形成。敏感性研究的结果证实了在较大范围的参数值中存在上行流。在颗粒保持悬浮在水柱的假设下，重力沉降的加入显着增加了上行通道的沉积物通量。沉积物沉降的作用是将靠近海底的颗粒捕获在底部增强的向上通道水流的核心内。作者推测该机制在大陆边缘的生物地球化学循环中起着重要作用。