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3D layer-integrated modelling of morphodynamic processes near river regulated structures

Faghihirad, S., Lin, Binliang and Falconer, Roger Alexander 2017. 3D layer-integrated modelling of morphodynamic processes near river regulated structures. Water Resources Management 31 (1) , pp. 443-460. 10.1007/s11269-016-1537-x

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Abstract

Sedimentation and erosion can significantly affect the performance of river regulated reservoirs. In the vicinity of flow control structures, the interaction between the hydrodynamics and sediment transport often induces complex morphological processes. It is generally very challenging to accurately predict these morphological processes in real applications. Details are given of the refinement and application of a three-dimensional (3-D) layer integrated model to predict the morphological processes in a river regulated reservoir. The model employs an Alternating Direction Implicit finite difference algorithm to solve the mass, momentum and suspended sediment transport conservation equations, and an explicit finite difference scheme for the bed sediment mass conservation equation for calculating bed level changes. The model is verified against experimental data reported in the literature. It is then applied to a scaled physical model of a regulated reservoir, including the associated intakes and sluice gates, to predict the velocity distributions, sediment transport rates and bed level changes in the vicinity of the hydraulic structures. It is found that the velocity distribution near an intake is non-uniform, resulting in a reduction in the suspended sediment flux through the intake and the formation of a sedimentation zone inside the reservoir.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Uncontrolled Keywords: MorphodynamicsNumerical modellingTurbulent flowsRegulated reservoirsThree-dimensional flowPhysical modellingLaboratory studies
Publisher: Springer
ISSN: 0920-4741
Date of First Compliant Deposit: 14 December 2016
Date of Acceptance: 30 October 2016
Last Modified: 04 Jun 2017 09:31
URI: http://orca.cf.ac.uk/id/eprint/96421

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