COMBINED CONVECTION-DIFFUSION MODELLING OF SEDIMENT ENTRAINMENT

Peter Nielsen

doi:10.9753/icce.v23.%p

No. 23 (1992), Conference Proceedings

No. 23 (1992)

COMBINED CONVECTION-DIFFUSION MODELLING OF SEDIMENT ENTRAINMENT

Conference Proceedings

https://doi.org/10.9753/icce.v23.%25p

Published 1992-01-29

Peter Nielsen⁺⁻

Peter Nielsen

Depeartment of Civil Engineering, The University of Queensland

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Keywords

sediment entrainment
convection modeling
diffusion modeling

How to Cite

Nielsen, P. (1992). COMBINED CONVECTION-DIFFUSION MODELLING OF SEDIMENT ENTRAINMENT. Coastal Engineering Proceedings, 1(23). https://doi.org/10.9753/icce.v23.%p

Abstract

A new, quantitative framework is presented for the modelling of suspended sediment concentration distributions. It accounts for large scale mixing (convection) as well as small scale mixing. The small scale mixing is modelled in terms of gradient diffusion as usual. It is shown how the new, combined convection-diffusion model can explain the different c(z)-distributions of different sediment sizes in the same flow. Also, the dependence of the c(z)-distribution shape on wave period and sediment settling velocity is explained for oscillatory flow over ripples. It is shown that individual Fourier components of cn{z,i) behave differently in diffusion dominated and in convection dominated flows. This makes it possible to determine the dominant entrainment mechanism (convection or diffusion) on the basis of concentration time series taken simultaneously at different levels.

https://doi.org/10.9753/icce.v23.%25p

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Authors retain copyright and grant the Proceedings right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this Proceedings.

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COMBINED CONVECTION-DIFFUSION MODELLING OF SEDIMENT ENTRAINMENT

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