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Large eddy simulation of turbidity currents in a narrow channel with different obstacle configurations
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Goodarzi, Danial, Sookhak Lari, Kaveh, Khavasi, Ehsan and Abolfathi, Soroush (2020) Large eddy simulation of turbidity currents in a narrow channel with different obstacle configurations. Scientific Reports, 10 . 12814 . doi:10.1038/s41598-020-68830-5 ISSN 2045-2322.
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Official URL: https://doi.org/10.1038/s41598-020-68830-5
Abstract
Turbidity currents are frequently observed in natural and man-made environments, with the potential of adversely impacting the performance and functionality of hydraulic structures through sedimentation and reduction in storage capacity and an increased erosion. Construction of obstacles upstream of hydraulic structures is a common method of tackling adverse effects of turbidity currents. This paper numerically investigates the impacts of obstacle’s height and geometrical shape on the settling of sediments and hydrodynamics of turbidity currents in a narrow channel. A robust numerical model based on LES method was developed and successfully validated against physical modelling measurements. This study modelled the effects of discretization of particles size distribution on sediment deposition and propagation in the channel. Two obstacles geometry including rectangle and triangle were studied with varying heights of 0.06, 0.10 and 0.15 m. The results show that increasing the obstacle height will reduce the magnitude of dense current velocity and sediment transport in narrow channels. It was also observed that the rectangular obstacles have more pronounced effects on obstructing the flow of turbidity current, leading to an increase in the sediment deposition and mitigating the impacts of turbidity currents.
| Item Type: | Journal Article | ||||||
|---|---|---|---|---|---|---|---|
| Subjects: | G Geography. Anthropology. Recreation > GE Environmental Sciences T Technology > TA Engineering (General). Civil engineering (General) T Technology > TC Hydraulic engineering. Ocean engineering T Technology > TD Environmental technology. Sanitary engineering |
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| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||||
| Library of Congress Subject Headings (LCSH): | Turbidity currents, Sedimentation and deposition, Hydraulic structures , Obstruction theory | ||||||
| Journal or Publication Title: | Scientific Reports | ||||||
| Publisher: | Nature Publishing Group | ||||||
| ISSN: | 2045-2322 | ||||||
| Official Date: | 30 July 2020 | ||||||
| Dates: |
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| Volume: | 10 | ||||||
| Article Number: | 12814 | ||||||
| DOI: | 10.1038/s41598-020-68830-5 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||||
| Date of first compliant deposit: | 31 July 2020 | ||||||
| Date of first compliant Open Access: | 31 July 2020 | ||||||
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