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Water 2019, 11(2), 235; https://doi.org/10.3390/w11020235

Investigation of Flow, Erosion, and Sedimentation Pattern around Varied Groynes under Different Hydraulic and Geometric Conditions: A Numerical Study

1
College of Transportation and Civil Engineering, Fujian Agriculture and Forestry University, No. 63, Xiyuangong Road, Shangjie, Minhou County, Fuzhou 350002, China
2
Department of Civil Engineering, University of Zanjan, University Blvd., Zanjan 45371-38791, Iran
3
Department of Civil Engineering, Semnan University, Mowlawi Blvd., Semnan 35196-45399, Iran
4
Department of Geography, Environmental Science and Planning, University of Swaziland, Kwaluseni M201, Swaziland
*
Author to whom correspondence should be addressed.
Received: 16 November 2018 / Revised: 20 January 2019 / Accepted: 26 January 2019 / Published: 30 January 2019
(This article belongs to the Section Hydraulics)
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Abstract

Groynes are popular hydraulic structures often used to control the erosion of banks by altering flow and sediment transport. In this paper, the effects of altering groyne orientation and spatial setup (from large to small and vice versa) on flow patterns, bed erosion, and sedimentation are numerically investigated. Studied groynes were parallel to each other, non-submerged, and impermeable. Numerical simulations were conducted in FLOW-3D. A nested mesh configuration combined with Van-Rijn formula on sediment transport yielded more accurate results when comparing numerical results to experiments. Groynes arranged from large to small at an angle of 45° decreased the scour depth by up to 55%, and an arrangement from small to large at an angle of 135° reduced the scour depth by up to 72%. Additionally, it was observed that simulations with an orientation closer to 90 degrees needed more equilibrium time when compared to other simulations. View Full-Text
Keywords: groynes with non-equal lengths; numerical simulation; erosion; sedimentation; flow pattern groynes with non-equal lengths; numerical simulation; erosion; sedimentation; flow pattern
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Choufu, L.; Abbasi, S.; Pourshahbaz, H.; Taghvaei, P.; Tfwala, S. Investigation of Flow, Erosion, and Sedimentation Pattern around Varied Groynes under Different Hydraulic and Geometric Conditions: A Numerical Study. Water 2019, 11, 235.

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