Boundary layer models for inverse estimates of entrainment and related processes at the sediment-water interface

With entrainment estimation required for both field data analysis and models this paper provides a compendium of the theoretical concentration boundary layer models and auxiliary shear stress estimators required to invert for estimates of entrainment rates. The various models are roughly categorized by the type of forcing function treated and three categories are defined. Within each category, no effort is made to evaluate one model over another. The essential points are that one field deployment might require the use of all categories of models to cover the succession of forcing function responses at a particular site. Interfacial boundary conditions expressed in the form of bed concentration and shear velocity are summarized, especially with regard to the limits imposed by the assumptions used in the derivation.