Sediment transport and roughness coefficients generated by flexible vegetation patches in the emergent and submerged conditions in a semiarid alluvial open-channel

Cavalcante, Douglas Monteiro; Chaves, Maria Tatiane Leonardo; Campos, Gabriella Moreira; Cantalice, José Ramon Barros; Barros, Genival

doi:10.1016/j.ecolind.2021.107472

Cited by 5 publications

(4 citation statements)

References 51 publications

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“…The morphodynamic evolution of river systems is intricately linked to the sediment load (Popovic et al., 2021; Wu et al., 2023). Vegetation drag predominantly influences the movement of bed‐load sediment (Cavalcante et al., 2021; Follett & Nepf, 2012; Wu et al., 2021a; Zong & Nepf, 2011). The presence of vegetation often results in a reduction in local flow velocity, facilitating sediment retention.…”

Section: Introductionmentioning

confidence: 99%

Drag Coefficient of Emergent Vegetation in a Shallow Nonuniform Flow Over a Mobile Sand Bed

Zhang,

Cheng,

Hassan

et al. 2024

Water Resources Research

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Widely distributed in natural rivers and coasts, vegetation interacts with fluid flows and sediments in a variable and complicated manner. Such interactions make it difficult to predict associated drag forces during sediment transport. This paper investigates the drag coefficient for an emergent vegetated patch area under nonuniform flow and mobile bed conditions, based on an analytical model solving the momentum equation following our previous work (Zhang et al., 2020, https://doi.org/10.1029/2020WR027613). Emergent vegetation was modeled with rigid cylinders arranged in staggered arrays of different vegetation coverage ∅. Laboratory flume tests were conducted to measure variations in both the water and bed surfaces along a vegetated patch on a sand bed. Based on the experimental and theoretical analyses, a dimensionless drag model integrating both terms of flow properties and bed effects is proposed to predict the drag coefficient Cd over a mobile bed. The calculated values of Cd exhibit two different trends, that is, nonmonotonically or monotonically increasing along the streamwise direction, due to the combined effect of water surface gradient and bed slope. The morphodynamic response of the mobile bed to nonuniform flow manifests as an evolution in the bed slope within the vegetated patch. Ongoing scouring directs the flow's energy toward overcoming the rising Cd and bed slope, leading to a relatively stable stage with a low sediment transport rate. This study advances the existing understanding of the drag coefficient's role over a mobile bed within nonuniform flows. It also enhances the applicability of vegetation drag models in riverine restoration.

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Section: Introductionmentioning

confidence: 99%

Drag Coefficient of Emergent Vegetation in a Shallow Nonuniform Flow Over a Mobile Sand Bed

Zhang,

Cheng,

Hassan

et al. 2024

Water Resources Research

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“…Additionally, placing submerged shallow sills on the river bottom at a specific distance can stop seawater from spreading across a much greater distance [15]. Cavalcante et al [16] investigated an emergent and submerged semiarid alluvial open channel on sediment transport and roughness coefficients created by vegetation patches that are flexible. This study measured water and solid discharge directly using hydro sedimentometry and estimated the hydraulic roughness coefficients of Ipomoea pes-flexible caprate's vegetation element under emergent and submerged conditions using a simplified force balance model.…”

Section: Introductionmentioning

confidence: 99%

“…This study measured water and solid discharge directly using hydro sedimentometry and estimated the hydraulic roughness coefficients of Ipomoea pes-flexible caprate's vegetation element under emergent and submerged conditions using a simplified force balance model. Aquatic vegetation density affects flow transport capacity hydraulically, increasing vegetation resistance to the flow and decreasing sediment transport capacity [16].…”

Section: Introductionmentioning

confidence: 99%

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Using CFD Modeling to Simulate the Control of the Propagation of Salt Wedge using Inclined Roughness Elements

Badr,

Azzubaidi

2023

E3S Web Conf.

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This research aims to simulate and use Computational Fluid Dynamics, CFD, to control the propagation of salt wedges. The flume has a cross-section of 25 cm in height and 7.5 cm in width with a length of 6 m and a zero slope. The simulated model is used to investigate the use of inclined roughness elements to control the propagation of salt wedges. The elements are blocks of 2 cm by 3 cm cross-sections having an inclined face in the direction of the flow, with a length of 2 and 3 cm. These elements were installed in two rows at both sides of the bed of the flume with variable spacing between them in the direction of the flow, and their centerline is inclined by an angle of 30 degrees in the direction of the flow. The simulation model was validated by comparing its output with a published laboratory experiment. Ten CFD model runs were conducted under two different discharges and five different spacing between the inclined roughness elements. The used discharges are 30 l/min and 45.3 l/min, and the spacing between elements was 3, 6, 9, 12, and 15 cm. The results demonstrated a good relationship between the obtained model runs and the observations of the laboratory experience under the same conditions. The result showed that when no roughness elements were used, the propagation of the salt wedge extended to 3.9 and 3.1 m at a discharge of 30 l/min and 45.31 l/min, respectively. The propagation of the salt wedge is reduced as the spacing increases to some limit and then starts to decrease when you use roughness elements. At the maximum applied discharge of 45.3 l/min, the propagation of the salt wedge was reduced by 82, 84, and 85% when the spacing between the blocks is 3, 6, and 9 cm, respectively. The percentage of reduction in the propagation of the salt wedge starts to reduce to 79% and 75% as the spacing between the blocks is increased to 12 and 15 cm, respectively. When the discharge is 30 l/min, the propagation of the salt wedge is reduced by 76, 74, and 78% at a spacing of 3, 6, and 9 cm, respectively. At the same time, the propagation is reduced by 58% at 12 cm and 53% as the spacing is increased to 12 and 15 cm.

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An inclusive multiple model for predicting total sediment transport rate in the presence of coastal vegetation cover based on optimized kernel extreme learning models

Jalil-Masir

Fattahi

Ghanbari-Adivi

et al. 2022

Environ Sci Pollut Res

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Sediment transport and roughness coefficients generated by flexible vegetation patches in the emergent and submerged conditions in a semiarid alluvial open-channel

Cited by 5 publications

References 51 publications

Drag Coefficient of Emergent Vegetation in a Shallow Nonuniform Flow Over a Mobile Sand Bed

Drag Coefficient of Emergent Vegetation in a Shallow Nonuniform Flow Over a Mobile Sand Bed

Using CFD Modeling to Simulate the Control of the Propagation of Salt Wedge using Inclined Roughness Elements

An inclusive multiple model for predicting total sediment transport rate in the presence of coastal vegetation cover based on optimized kernel extreme learning models

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