Hydraulic jump over an adverse slope controlled by different roughness elements

Parsamehr, P; Kuriqi, Alban; Farsadizadeh, D; Dalir, A Hosseinzadeh; Daneshfaraz, Rasoul; Ferreira, R.

doi:10.1007/s11269-022-03330-x

Cited by 19 publications

(6 citation statements)

References 34 publications

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“…Santos et al (2014) found that a high density boulder configuration combined with a higher discharge can reduce fish transit time. In fact, Mohammad Nezhad et al (2022) and Parsamehr et al (2022) showed that the bed shear stress caused by discontinuous roughness elements can increase energy dissipation by generating more turbulence.…”

Section: Introductionmentioning

confidence: 99%

Design of a bilateral‐symmetric multi‐slot fishway and its comparison with vertical slot fishway in terms of hydraulic properties

Zhang

Bian

Shi

et al. 2023

River Research & Apps

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Aiming at improving the hydraulic properties and enhancing the fish passage efficiency, this study proposes a novel bilateral‐symmetric multi‐slot fishway (BMSF) by combining the structural features of a double‐sided vertical‐slot fishway, multi‐slot fishway and T‐shape fishway. Eight BMSF cases are further designed by adjusting the slot width and the distance between the short baffle and the front end of the central wall, in order to achieve the relatively best hydrodynamic characteristics. The flow fields of two vertical‐slot fishways and eight BMSF fishways are obtained by numerically solving the Reynolds‐averaged Navier–Stokes equation, the volume‐of‐fluid equation and the k‐ω‐SST turbulence model. Numerical results manifest that the recommended BMSF‐8 provides the smallest values in terms of the maximum time‐averaged velocity magnitude (1.42 m s−1), the maximum time‐averaged turbulent kinetic energy (0.132 m2 s−2), the maximum time‐averaged Reynolds shear stress component (44 Pa), the spatial‐mean time‐averaged velocity magnitude (0.58 m s−1), and the spatial‐mean time‐averaged turbulent kinetic energy (0.042 m2 s−2) in the middle pool at Q = 1000 L/s. Even for the depth‐mean time‐averaged velocity magnitude at the slot and the volume percentages of some critical physical quantities, BMSF‐8 is also superior to the other cases. To sum up, BMSF‐8 leads to the relatively lowest flow velocity and turbulence, being more suitable for the passage of the whole fish community (especially for small‐sized fishes with weaker swimming ability). In addition, the generalizability of the aforementioned superiority of BMSF‐8 is displayed by providing the numerical results of four operating conditions (i.e., Q = 600, 800, 1000 and 1200 L/s).

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Section: Introductionmentioning

confidence: 99%

Design of a bilateral‐symmetric multi‐slot fishway and its comparison with vertical slot fishway in terms of hydraulic properties

Zhang

Bian

Shi

et al. 2023

River Research & Apps

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“…If this effect predominates, the procedure might not be appropriate. Parsamehr et al 30) experimented on an adverse slope for hydraulic jumps controlled by roughness elements. The Froude number during experimentation varied from 4.9 to 12.4.…”

Section: Fig 1: Effects and Applications Of Hydraulic Jumpmentioning

confidence: 99%

Prediction of Depth Ratio, Jump Length and Energy Loss in Sloped Channel Hydraulic Jump for Environmental Sustainability

Gupta¹,

Dwivedi²

2023

Evergreen

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The association of enormous amounts of energy proximate to hydraulic structures, like spillways, downstream of draft tubes, etc., which might be harmful to environment, has prompted the researcher to consider this occurrence to dissipate this excess energy. Due to natural occurrence, hydraulic jump unavoidably reduces incoming flow energy. Most of the researchers considered hydraulic jump characteristics to be the function of inflow Froude number but in this research, the effects of incoming Reynolds number (Re1) is introduced first time in a sloped channel jump and all the correlation are formed while taking into account the influence of Re1, inflow Froude number (Fr1) and Channel slope (θ). The experiment was performed in the sloped channel (0 0 , 2 0 , 4 0 and 6 0 ) in an open channel flow test setup and eight experiments are designed and performed and collected 57 data for each channel slope. Regression analysis was utilised after using Buckingham's theorem to make all the variables dimensionless to generate correlations. Moreover, error analysis was carried out, and all created correlations were compared to correlations that had already been developed. The depth ratio (d2/d1) increases by 34.85%, relative length (Lj/d1) decreases by 18.91% and energy loss (EL/E1) increases by 63.62% for 6 0 channel slope as compared to the classical jump. The R 2 value of developed correlation for d2/d1, Lj/d1, Lj/d1 (in terms of d1/d2) and EL/E1 was 0.98, 0.975, 0.98 and 0.99 respectively which shows the efficacy of the entire developed model.

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“…This suggests a corresponding decrease in the stilling basin's depth. Parsamehr et al [15] used various roughness elements on adverse slopes to predict jump characteristics experimentally. According to the research, the shear stress coefficient due to bed roughness was 12.4 times higher on a negative slope of −2.5% with a relative roughness height (h/d 1 ) of = 1.33 than it was on a smooth bed.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of hydraulic jump characteristics in sloping rough surfaces for sustainable development

Gupta,

Dwivedi

2024

Eng. Res. Express

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Understanding the intricate dynamics of hydraulic jumps in sloped channels holds pivotal importance in various engineering applications. This research explores the intricate relationship between the size of the bed material and the basic properties of hydraulic jumps, providing insight into the relative jump length, height, and energy efficiency. The goal of the research is to get important knowledge that will be useful for optimizing hydraulic systems and enhancing their overall efficiency in diverse engineering domains. This study used an open-channel flow arrangement with four-bed slopes (0° to 6°) and three irregularity heights (10 to 30 mm). During the investigation, the Froude number differed from 2.30 to 8.85 and the Reynolds number differed from 5450 to 25500. A novel instinctive technique was used to create correlations for different hydraulic jump characteristics in roughen-bed inclined channels. The study examines the combined effects of roughness and slope of the bed, and it was discovered that the relative jump height and efficiency of hydraulic jump increase by 19.37% and 8.44% respectively while the relative jump length decreases by 23.05% with an increase in bed slope from 0° to 6°. The relative jump height and efficiency of the hydraulic jump increase by 14.20% and 21.06% respectively while the relative jump length decreases by 29.09% with a rise in bed roughness from 0 to 30 mm.

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Hydraulic jump over an adverse slope controlled by different roughness elements

Cited by 19 publications

References 34 publications

Design of a bilateral‐symmetric multi‐slot fishway and its comparison with vertical slot fishway in terms of hydraulic properties

Design of a bilateral‐symmetric multi‐slot fishway and its comparison with vertical slot fishway in terms of hydraulic properties

Prediction of Depth Ratio, Jump Length and Energy Loss in Sloped Channel Hydraulic Jump for Environmental Sustainability

Experimental investigation of hydraulic jump characteristics in sloping rough surfaces for sustainable development

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