Effect of submerged vegetation density on flow under favorable pressure gradient

Brahimi, Mahboobeh; Afzalimehr, Hossein

doi:10.1007/s42452-018-0052-5

Cited by 6 publications

(1 citation statement)

References 48 publications

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“…Furthermore, because this type of rivers goes dry during a certain period of the year, they are characterised by overgrown vegetation, mainly macrophytes, which influence the roughness of the river reach significantly [23,24]. Because of several factors influencing the Manning n roughness coefficient, accurate measurement is a challenging task, and it demands very extensive work.…”

Section: Introductionmentioning

confidence: 99%

Calibration of channel roughness in intermittent rivers using HEC-RAS model: case of Sarimsakli creek, Turkey

Ardıçlıoğlu¹,

Kuriqi

2019

SN Appl. Sci.

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Natural channel's roughness determination constitutes one the most challenging procedure towards the development of hydraulic models for flood prediction and flood hazard mapping. Therefore, it is essential to calibrate and validate the channel's Manning's n roughness coefficient using simulation models. In this study, we calibrated and validated Manning's n roughness coefficient using HEC-RAS for Sarimsakli creek that is tributary of the Kizilirmak river in central Anatolia, Turkey. For calibration of Manning's n-values, six different flow regimes were considered based on mean daily flow records between 2005 and 2010. We found that calculated water surface profiles for different Manning's n are slightly lower than the measured one, that indicates a continuous underestimation of the roughness coefficient n by the model. Therefore, our results suggest that higher values of Manning's n should be considered in case of the intermittent rivers. A polynomial relationship was proposed between roughness values and Froude numbers. Finally, a linear relation was established between calculated and measured Manning's n roughness coefficient. Nevertheless, results showed that careful attention should be given to higher n-values because the differences between HEC-RAS and Manning's n becomes larger. Solution-oriented results obtained and the methodology applied to the Sarimsakli creek may serve as a practical reference for HEC-RAS modelling and flood prediction in intermittent rivers. Keywords Ecohydraulics • Flood risk • Flooding • Hydraulic model • Riparian vegetation • River restoration List of symbols HEC-RAS River Analysis System (RAS) developed by Hydrologic Engineering Center (HEC) of U.S. Army Corps of Engineers 1D/2D One dimensional/two dimensional n Manning's roughness coefficient (s/m 1/3) Q Flow discharge (m 3 s −1) V Flow velocity (m s −1) A Submerged cross-section's area (m 2) R Hydraulic radius (m) P Wetted perimeter (m) S ws Water surface slope (m/m) Fr Froude number (−) g Gravitational acceleration (ms −2) S Friction slope (m/m) ε Average difference (%) h meas Measured depth (m) h calc Calculated depth (m) S o Channel bottom slope (m/m) S f Friction slope (m/m) t Time (s) q l Lateral inflow (m 3 s −1) x Longitudinal coordinate (m)

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Section: Introductionmentioning

confidence: 99%

Calibration of channel roughness in intermittent rivers using HEC-RAS model: case of Sarimsakli creek, Turkey

Ardıçlıoğlu¹,

Kuriqi

2019

SN Appl. Sci.

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Effect of Reedy Emergent Side-Vegetation in Gravel-Bed Streams on Bed Shear Stress: Patch Scale Analysis

Parisa

Afzalimehr

2021

Iran J Sci Technol Trans Civ Eng

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Recent advances in nanomaterial-based electrochemical detection of antibiotics: Challenges and future perspectives

Joshi

Kim

2020

Biosensors and Bioelectronics

173

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Effect of submerged vegetation density on flow under favorable pressure gradient

Abstract: Many species of flexible submerged vegetation are observed in natural streams in which the flow is rarely uniform. For better understanding the effect of flexible submerged vegetation density on the flow, experiments were conducted in the

Cited by 6 publications

References 48 publications

Calibration of channel roughness in intermittent rivers using HEC-RAS model: case of Sarimsakli creek, Turkey

Calibration of channel roughness in intermittent rivers using HEC-RAS model: case of Sarimsakli creek, Turkey

Effect of Reedy Emergent Side-Vegetation in Gravel-Bed Streams on Bed Shear Stress: Patch Scale Analysis

Recent advances in nanomaterial-based electrochemical detection of antibiotics: Challenges and future perspectives

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