Effect of sinusoidal corrugated bed on hydraulic jump characteristics

Abbaspour, Akram; Dalir, A Hosseinzadeh; Farsadizadeh, D; Sadraddini, Ali Ashraf

doi:10.1016/j.jher.2009.05.003

Cited by 41 publications

(25 citation statements)

References 6 publications

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“…Pagliara et al [18] carried out laboratory tests in a flume with a uniform and non-homogeneous bed material to present experimental relationships to estimate the main features of the hydraulic jump, such as roller, jump length, and sequent depth ratio. Abbaspour et al [19] investigated the effect of sinusoidal corrugated bed with different wave steepness on the basic features of the hydraulic jump. They showed that the length ratio and the tailwater depth ratio of the jump on corrugated beds are smaller than that of the corresponding jump on a smooth bed.…”

Section: Introductionmentioning

confidence: 99%

Hydraulic Jump below Abrupt Asymmetric Expanding Stilling Basin on Rough Bed

Torkamanzad

Dalir

Salmasi

et al. 2019

Water

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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.

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Section: Introductionmentioning

confidence: 99%

Hydraulic Jump below Abrupt Asymmetric Expanding Stilling Basin on Rough Bed

Torkamanzad

Dalir

Salmasi

et al. 2019

Water

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“…Compiling the experimental data of Ead and Rajaratnam (2002), Tokyay (2005) found out that, D was 0.2, Lj/Y2* was 4 for Fr 1 >6 and higher energy losses were achieved using corrugated beds comparing to smooth bed. Also, Abbaspour et al (2009) studied the sinusoidal corrugation further by using wide ranges of t/Y 1 and t/s of (0.32-1.67) and (0.286-0.625) respectively and Fr 1 range of 3.8-8.6. The findings of the research were, D was 0.2, Lj/Y2* was 3 (Fr 1 <6) and 3.5 (Fr 1 >6).…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Hydraulic Jump on a Striped Channel Bed

ALIL¹,

SARHAN²,

ALI³

2017

juod

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The substantive conditions are affecting the subjective process of creating rapid turbulent changes in flow. Such character happens in hydraulic jump phenomenon, which depends on how much of flow kinetic energy changes into potential energy. During this process part of the kinetic energy is dissipated by taking other types of energy in the channel. The quantity of energy dissipated reflects on the height and length of the jump. The effects of lowering the bed of channel by means of square strips of six different spaces (2, 3, 4,5,6,7 cm) respectively are studied experimentally with additional smooth bed. The investigation leads that bed strips increases the energy dissipation by 6%. The energy dissipation increases with the increase of strips spacing, the best spacing is between 5 and 6 cm. Consequently jump height decreases which is reflected by the reduction of the relative sequent depth value by (6%-15%). While the relative length of jump decreases by 22% and 28% compared with the smooth bed. The mean dimensionless depth deficit is 0.15 and normalized jump length is 2.5. Within the limitations of this work, different relationships are suggested to predict hydraulic jump characteristics with coefficient of determination more than 0.9.

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“…The hydraulic jump on a corrugated bed has been studied by Ead andRajaratnam (2002), Tokay (2005), Yadav and Ahmad (2007), and Abbaspour et al (2009), in which the height of corrugation from crest to trough and wave length of corrugation play significant roles in the corrugated beds. Mohamed-Ali (1991), Negm (2002), Izadjoo and Bajestan (2005), and Bejestan and Neisi (2009) have considered the effects of roughened-bed stilling basin on the length of a hydraulic jump in a rectangular channel.…”

Section: Introductionmentioning

confidence: 99%