New research by Alexander Metelkin & Bernhard Vowinckel in the International Journal of Sediment Research

A recent study by Alexander Metelkin & Bernhard Vowinckel highlights the critical role of sediment aggregate permeability in determining their settling behavior. Until now, this factor has often been overlooked because it is challenging to measure directly. The study compares two approaches: one that assumes a fractal aggregate structure and neglects permeability, and another that uses a constant porosity and includes permeability. The results show that both models yield similarly accurate predictions for highly porous aggregates. In addition, detailed numerical simulations were used to investigate the behavior of permeable and impermeable flocs in dense suspensions and stratified environments. The findings reveal that in complex flow conditions, permeability has a significant impact—and should be taken into account when modeling sediment transport.