Numerical modelling of hydro-morphological processes dominated by fine suspended sediment in a stormwater pond

Guan, M., Ahilan, S., Yu, D., Peng, Y. and Wright, N. ORCID: 0000-0002-1289-2830, 2018. Numerical modelling of hydro-morphological processes dominated by fine suspended sediment in a stormwater pond. Journal of Hydrology, 556, pp. 87-99. ISSN 0022-1694

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Abstract

Fine sediment plays crucial and multiple roles in the hydrological, ecological and geomorphological functioning of river systems. This study employs a two-dimensional (2D) numerical model to track the hydro-morphological processes dominated by fine suspended sediment, including the prediction of sediment concentration in flow bodies, and erosion and deposition caused by sediment transport. The model is governed by 2D full shallow water equations with which an advection–diffusion equation for fine sediment is coupled. Bed erosion and sedimentation are updated by a bed deformation model based on local sediment entrainment and settling flux in flow bodies. The model is initially validated with the three laboratory-scale experimental events where suspended load plays a dominant role. Satisfactory simulation results confirm the model’s capability in capturing hydro-morphodynamic processes dominated by fine suspended sediment at laboratory-scale. Applications to sedimentation in a stormwater pond are conducted to develop the process-based understanding of fine sediment dynamics over a variety of flow conditions. Urban flows with 5-year, 30-year and 100-year return period and the extreme flood event in 2012 are simulated. The modelled results deliver a step change in understanding fine sediment dynamics in stormwater ponds. The model is capable of quantitatively simulating and qualitatively assessing the performance of a stormwater pond in managing urban water quantity and quality.

Item Type: Journal article
Publication Title: Journal of Hydrology
Creators: Guan, M., Ahilan, S., Yu, D., Peng, Y. and Wright, N.
Publisher: Elsevier
Date: January 2018
Volume: 556
ISSN: 0022-1694
Identifiers:
NumberType
10.1016/j.jhydrol.2017.11.006DOI
S002216941730759XPublisher Item Identifier
Divisions: Professional Services > The Directorate
Depositing User: Linda Sullivan
Date Added: 26 Oct 2018 14:21
Last Modified: 26 Oct 2018 14:21
URI: http://irep.ntu.ac.uk/id/eprint/34764

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