Numerical Investigation on Flow Characteristics in a Mildly Meandering Channel with a Series of Groynes

Changfeng Ding, Chunguang Li (), Lulu Song and Shaozhuo Chen
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Changfeng Ding: School of Civil and Hydraulic Engineering, Ningxia University, Yinchuan 750021, China
Chunguang Li: School of Mathematics and Information Science, North Minzu University, Yinchuan 750021, China
Lulu Song: School of Civil and Hydraulic Engineering, Ningxia University, Yinchuan 750021, China
Shaozhuo Chen: School of Civil and Hydraulic Engineering, Ningxia University, Yinchuan 750021, China

Sustainability, 2023, vol. 15, issue 5, 1-21

Abstract: In single-bend channels or meandering channels, groynes are widely used as a river-training structure. Geometric factor is an important principle of groyne design. In this paper, the numerical method based on the Renormalization Group (RNG) k-ε turbulence model is used to study the effects of groynes with different lengths and orientations on the mean flow pattern and turbulence characteristics in a mildly meandering channel. The analysis shows that compared with equal-length groynes, the groynes arranged in descending order perform well in improving the flow velocity of the main channel, and the maximum longitudinal velocity at the channel center can be increased by 1.57 times the average velocity. However, at the same time, they bring higher Normalized Turbulent Kinetic Energy (NTKE) and Normalized Bed Shear Stress (NBSS) values. The attracting groynes arranged in descending order help to reduce scouring. The groynes arranged in ascending order reduce the velocity of the riverbank in some downstream areas and are suitable for bank protection. It effectively decreases the NTKE and NBSS around the groyne fields and can reduce the inner bank scouring of the mildly meandering channel. The findings are helpful for the management of meandering rivers.

Keywords: numerical investigation; meandering channel; groynes; turbulent kinetic energy; bed shear stress (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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