Towards Improved Engineering Model for Sediment Transport Prediction Under Combined Wave-Current Sheet Flows



Li, M
(2013) Towards Improved Engineering Model for Sediment Transport Prediction Under Combined Wave-Current Sheet Flows. Civil Engineering and Architecture.

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Abstract

Sediment transport under combined wave-current sheet flow condition is predicted by a wave-period-averaged (WPA) profile model based on a diffusion concept. The total transport rate is split into current induced and wave induced components with associated model parameters. The current induced transport rate is evaluated through vertical profiles of wave-period-averaged flow velocity and sediment concentration. A new wave-induced transport profile is also proposed utilising the wave-induced current residual velocity and period-averaged sediment concentrations. Important sheet flow processes, including turbulence dumpling in the suspension layer, sediment particle’s hindered settling and phase-lag effects are taken into account through a number of model parameters that have been validated by available laboratory measurements. Sediment size gradient is also considered by a conventional multi-fraction approach with special treatment for the sediment mixing parameters for fine and coarse sediment fractions. Model results for both laboratory and field measurements show its encouraging accuracy for the sediment transport prediction under sheet flow condition.

Item Type: Article
Additional Information: Available under the terms and conditions of the Creative Commons Attribution License (CC-BY) (http://creativecommons.org/licenses/by/3.0/ ).
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TC Hydraulic engineering. Ocean engineering
Depositing User: Symplectic Admin
Date Deposited: 28 Jul 2015 15:11
Last Modified: 05 Jan 2018 08:10
DOI: 10.13189/cea.2013.010103
URI: http://livrepository.liverpool.ac.uk/id/eprint/2018081

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