Laboratory investigation of flow and turbulent characteristics around permeable and impermeable groynes in a strongly curved meandering channel

Jayasree, P. K.; Balan, K.

doi:10.1080/09715010.2022.2115318

Cited by 3 publications

(1 citation statement)

References 39 publications

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“…The previous experimental and numerical studies have concentrated mostly on estimating the equilibrium scour depth around I-head groynes [10,14,17,[21][22][23][24][25][26][27][28]. Some have observed the mean flow and turbulence around the I-head groynes [5,8,[29][30][31][32][33][34][35][36][37][38]. There are limited studies available on how the head shape of the groyne influences the flow.…”

Section: Introductionmentioning

confidence: 99%

Development of a Framework for Cost–Benefit Analysis of I-Head and T-Head Groynes Based on Scour and Turbulent Flow Characteristics

Mall,

Priyanka,

Hari Prasad

et al. 2023

Sustainability

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River bank protection is a vital component of sustainable development. This study investigates and compares the scour and flow features around two different types of groynes, an unsubmerged I-head groyne (IHG) and T-head groyne (THG), to provide insights into their performance and efficiency in river reaches. Experiments were conducted to examine the scouring pattern, mean and turbulent flow characteristics including 3D mean flow velocity distribution, Reynolds stresses, turbulent kinetic energy, and bed shear stress near the bed region around the groynes under similar flow conditions. The results indicated that THG had a maximum equilibrium scour depth over three-fold greater than IHG. For both the IHG and THG cases, it was observed that there is a direct correlation between the location of maximum negative vertical velocity and its magnitude to the region of maximum local scour and its depth. All the stresses of high magnitude are found along the propagation of the detached shear layer profile, which turns back sharply downstream towards the bank containing the IHG while remaining mostly away from the bank in the case of THG. The effective bank protection length was estimated to be two-fold the groyne length in the case of IHG and three-fold the groyne transverse length in the case of THG. Cost–benefit analysis of the two groyne types shows IHG as the more cost-efficient groyne with respect to bank protection lengths. This study provides valuable insights for developing design methodologies aimed at promoting the wider utilization of different head-shape groynes in river reaches and aids in selecting appropriate groyne head configurations that align with specific field requirements.

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Section: Introductionmentioning

confidence: 99%

Development of a Framework for Cost–Benefit Analysis of I-Head and T-Head Groynes Based on Scour and Turbulent Flow Characteristics

Mall,

Priyanka,

Hari Prasad

et al. 2023

Sustainability

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Experimental Study on Flow Characteristics and Energy Reduction Around a Hybrid Dike

Iqbal

Tanaka

2023

Int J Civ Eng

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

Ding

Song

et al. 2023

Sustainability

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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.

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Laboratory investigation of flow and turbulent characteristics around permeable and impermeable groynes in a strongly curved meandering channel

Cited by 3 publications

References 39 publications

Development of a Framework for Cost–Benefit Analysis of I-Head and T-Head Groynes Based on Scour and Turbulent Flow Characteristics

Development of a Framework for Cost–Benefit Analysis of I-Head and T-Head Groynes Based on Scour and Turbulent Flow Characteristics

Experimental Study on Flow Characteristics and Energy Reduction Around a Hybrid Dike

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

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