Submerged Hydraulic Jumps below Abrupt Expansions

Ohtsu, Iwao; Yasuda, Youichi; Ishikawa, Motoyasu

doi:10.1061/(asce)0733-9429(1999)125:5(492)

Cited by 51 publications

(57 citation statements)

References 9 publications

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“…Rajanatnam [9] , Hager [10] , and Iwao Ohtsu [11] investigated underflow energy dissipation below abrupt symmetrical expansions or with drop sill and Katakam [12] studied both of them. Their researches show that underflow energy dissipation below abrupt symmetrical expansions with drop sill has the highest energy dissipation ratio and the best flow pattern.…”

Section: The Formation Of Multi-horizontal Submerged Jetsmentioning

confidence: 99%

A new type of plunge pool—Multi-horizontal submerged jets

Deng

Zhang

et al. 2008

Sci. China Ser. E-Technol. Sci.

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Based on the understanding of the mechanism of energy dissipation, a new type of plunge pool is presented with the advantages of high rate of energy dissipation, low impact pressure, and small close-to-bed velocity on the soleplate of the plunge pool. The first advantage owes to enlarged shearing energy dissipation areas in the plunge pool, while the other two are caused by the jet that enters in a nearly horizontal level to keep the soleplate from being scoured directly. All of the above arrangements make this new type of energy dissipator distinct from the underflow energy dissipation. Through experiments on the physical model, the authors found that the water flow maintained stable and submerged in horizontal direction when the flow was narrow in horizontal but thick in vertical direction. However, the wide flat nappe was ready to submerge or float as the downstream water level rised or dropped. The entire flow fields of multi-horizontal submerged jets into plunge pool were also numerically simulated. The numerical results of water surface curve, close-to-bed velocity and floor pressure agree well with the experimental data. The flow pattern in the plunge pool was analyzed after combining the laboratory data and numerical simulation. hydraulic engineering, 3-D flow field, numerical simulation, plunge pool, submerged jets

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Section: The Formation Of Multi-horizontal Submerged Jetsmentioning

confidence: 99%

A new type of plunge pool—Multi-horizontal submerged jets

Deng

Zhang

et al. 2008

Sci. China Ser. E-Technol. Sci.

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“…Additionally, lateral free spaces in end-sill may increase the sediment sluicing and fish migration rate. In spite the fact, there are enormous numbers of researches on hydraulic jumps within stilling basin (Sumi & Nakanishi, 1991;Chanson & Montes,1995;Katakam & Rama, 1998;Ohtsu et al, 1999;Larson, 2004;Pagliara et al, 2008;Zare & Doering, 2011), 3D nature of energy dissipation process at the presence of forced hydraulic jumps within simultaneous combination of sudden lateral enlargement, abrupt drop and end-sill is not yet solved in the literature. Fulfilling the gap of knowledge under this topic was the major motivation to conduct this investigation.…”

Section: Introductionmentioning

confidence: 99%

Energy dissipation within in-ground stilling basin

Shahmirzadi¹,

Takemon²,

Kantoush³

2014

Hydraulic Structures and Society - Engineering Challenges and Extremes

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“…A forced hydraulic jump within a confined and complex structure such as ISB has yet to be solved in the literature. This study specifically focused on a small expansion ratio (=bottom outlet width/ ISB width) of 0.2, as it is more practically common and causes a periodic and unstable flow pattern rather than larger expansion ratios 2) . Present research experimentally investigates the hydraulic characteristics of the forced hydraulic jump in an ISB and attempts to classify the possible flow patterns within it under different hydraulic and geometry conditions.…”

Section: Introductionmentioning

confidence: 99%

hydraulic design of in-ground stilling basin under submerged jump conditions for flood mitigation dams

Shahmirzadi

Sumi

2013

J. JSCE

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Forced submerged jumps within a non-prismatic stilling basin, named in-ground stilling basin, were experimentally investigated. An in-ground stilling basin (ISB) is a newly popular concept for stilling basin downstream of flood mitigation dams (FMDs). In FMDs usually one bottom outlet is located in the centerline and the width of the stilling basin is much wider than the width of the bottom outlet, which leads to a small expansion ratio, k, for the outflow. This study experimentally investigates the flow patterns and velocity reduction, within ISB downstream of FMDs, under different hydraulic and geometric conditions. Finally, an innovative design guide-line is proposed considering downstream flow requirement.

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Submerged Hydraulic Jumps below Abrupt Expansions

Cited by 51 publications

References 9 publications

A new type of plunge pool—Multi-horizontal submerged jets

A new type of plunge pool—Multi-horizontal submerged jets

Energy dissipation within in-ground stilling basin

hydraulic design of in-ground stilling basin under submerged jump conditions for flood mitigation dams

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