An Experimental Study of Hydraulic Jump in a Gradually Expanding Rectangular Stilling Basin with Roughened Bed

Hassanpour, Nasrin; Dalir, A Hosseinzadeh; Farsadizadeh, D; Gualtieri, Carlo

doi:10.3390/w9120945

Cited by 29 publications

(19 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Figure 17 indicates that the results obtained by the Equation 31show ± 26% variation with the corresponding observed data. Additionally, the difference between the computed data of L r /y 1 by Equation (32) and the experimental data of present research, Ead and Rajaratnam [15] and Carollo et al [17] are in the range of ±30% and only 9 out of the 356 L r /y 1 ratios fall beyond the mentioned error band. The following regression-based equation is defined between the estimated values, the expansion ratio and the relative roughness height.…”

Section: Methodscontrasting

confidence: 59%

“…The experimental values of L r /y 1 in the present research, Carollo et al [17] and Ead and Rajaratnam [15] are compared with the values computed by Equations (31) and (32) in the Figure 17a,b, respectively. The Figure 17 indicates that the results obtained by the Equation 31show ± 26% variation with the corresponding observed data.…”

Section: Methodsmentioning

confidence: 82%

“…Hassanpour et al [32] studied the characteristics of the hydraulic jump in a gradually expanding rectangular stilling basin. They showed that the sequent depth ratio and relative length of the jump decreased by the decreasing divergence ratio.…”

Section: Of 29mentioning

confidence: 99%

“…Fitting Equations (26) and (27) to all experimental data obtained from this research gives a = 4.963 and a 0 = 2.227. Therefore, Equations (31) and (32) for this study can be written as:…”

Section: Relative Roller Lengthmentioning

confidence: 99%

See 3 more Smart Citations

Hydraulic Jump below Abrupt Asymmetric Expanding Stilling Basin on Rough Bed

Torkamanzad

Dalir

Salmasi

et al. 2019

Water

Self Cite

View full text Add to dashboard Cite

The present research describes a laboratory study of hydraulic jump in the abrupt asymmetric expansion stilling basin as an energy dissipator by changing the geometry of walls and bed roughness elements. The experiments were carried out in a horizontal flume with 10 m length, 0.5 m width, and 0.5 m depth for a range of the upstream Froude numbers ( F r 1 ) from 5 to 11. Four physical models with expansion ratio of α = 0.33, 0.5, 0.67, and 1 and asymmetry ratio of Δ = 0.16 were installed in the flume and two different heights of roughness elements ( h = 1.4 and 2.8 cm) were also considered. The results indicated that the sequent depth and the jump length as well as the roller length below abrupt asymmetric expansion on the rough bed were decreased in comparison to the same parameters of the jump in a prismatic channel with smooth bed. It was revealed that the roughness elements have the effective role on stabilization of the hydraulic jump location. The analysis of energy dissipation efficiency confirmed that the spatial jump in the abruptly expanded basin with roughened bed was more efficient than classical jump. In order to estimate the hydraulic jump characteristics, empirical relationships associated with expansion ratio of basin walls, relative height of roughness elements and upstream Froude number were proposed based on the experimental data that resulted in preliminary design of an abrupt asymmetric enlarged basin.

show abstract

Section: Methodscontrasting

confidence: 59%

Section: Methodsmentioning

confidence: 82%

Section: Of 29mentioning

confidence: 99%

“…Fitting Equations (26) and (27) to all experimental data obtained from this research gives a = 4.963 and a 0 = 2.227. Therefore, Equations (31) and (32) for this study can be written as:…”

Section: Relative Roller Lengthmentioning

confidence: 99%

See 2 more Smart Citations

Hydraulic Jump below Abrupt Asymmetric Expanding Stilling Basin on Rough Bed

Torkamanzad

Dalir

Salmasi

et al. 2019

Water

Self Cite

View full text Add to dashboard Cite

show abstract

“…Carollo and Ferro [21] studied the characteristics of hydraulic jump on a rip-raped bed and concluded that relative sequent depth y 2 /y 1 decreases with the size of bed roughness. Hassanpour et al [22] investigated the effect of geometric and hydraulic parameters on energy dissipation and location of the hydraulic jump, in different roughness heights and the divergence of walls. Their results showed that the tail-water depth, the roller length, and the hydraulic jump length on a gradual expansion basin with the rough bed were significantly smaller than that of the classical hydraulic jumps in a rectangular basin with smooth and rough bed.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Hydraulic Jump over Rough Beds

Nikmehr

Aminpour²

2020

Period. Polytech. Civil Eng.

View full text Add to dashboard Cite

In this study, the hydraulic jumps over rough beds are numerically simulated. In order to calibrate the numerical model, the experimental data were used, which performed in a rectangular flume in various roughness arrangements and different Froude numbers. The effect of the distance (s) and the height (t) of the roughness on different characteristics of the hydraulic jump, including the sequent depth ratio, water surface profile, jump’s length, roller’s length, and velocity distribution were evaluated and compared. The results showed that the numerical model is fairly well able to simulate the hydraulic jump characteristics. The results also showed that the height and distance of roughness slightly reduced the sequent depth ratios for all Froude numbers. Also, the hydraulic jump length is reduced at the presence of the rough bed. Velocity profiles in different experiments were similar and there was a good agreement between simulated and measured results. Also, increasing the distance and the height of the roughness will slow down the velocity near the bed, increase the shear stress, and increase the gradient of the velocity distribution near the bed.

show abstract

Flow Downstream Sluice Gate with Orifice

Mohamed

Abdelhaleem

2020

KSCE J Civ Eng

View full text Add to dashboard Cite

An Experimental Study of Hydraulic Jump in a Gradually Expanding Rectangular Stilling Basin with Roughened Bed

Cited by 29 publications

References 34 publications

Hydraulic Jump below Abrupt Asymmetric Expanding Stilling Basin on Rough Bed

Hydraulic Jump below Abrupt Asymmetric Expanding Stilling Basin on Rough Bed

Numerical Simulation of Hydraulic Jump over Rough Beds

Flow Downstream Sluice Gate with Orifice

Contact Info

Product

Resources

About