Effect of Step Geometry on Local Scour Downstream of Stepped Chutes

Tuna, Muhammed Cihat; Emiroğlu, M. Emin

doi:10.1007/s13369-012-0335-x

Cited by 24 publications

(9 citation statements)

References 18 publications

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“…In free-surface flow, gravity effects are always important, and Froude Number modeling is used, hence viscous and surface tension effects are negligible in the prototype. According to Chow [18], the model flow must behave as a prototype for Reynolds Number is larger than 2000, and Weber Number is higher than 11, according to [19and20]. If scale effects will become significant in a model, a smaller prototype-to-model scale ratio should be used to minimize the scale effects.…”

Section: Model Similitudementioning

confidence: 99%

Experimental Investigation of Energy Dissipation in Ogee Spillway Using New Distributions of Dissipation Blocks

Al-Fatlawi,

Al-Shuker

2023

E3S Web Conf.

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Ogee spillway is the most important structure used to get rid of excess water during flood. Scouring phenomenon occurring in the downstream region due to high energy dissapation is an envitable. This study aims to reduce the amount of scour occurred at the downstream stilling basin of the ogee spillway by using three dissipation energy blocks namely as baffle, triangle and stepped blocks. A new distribution was proposed for each type of dissipated block, which varied between one row, two rows, and three rows. The flow and scour experimental tests were carried out under Froude numbers ranging from 2.5 to 8.5. During the tests, sequent depths and transverse velocities distribution were measured. The results showed that the used blocks appeared with good results in minimizing flow velocities and sediment scouring within the stilling basin in accordance with proposed distributions, especially with the range of Froude number 4.5-8.5. Also, The stepped block is characterized by reducing the flow velocities compared to the baffle block and triangle block, as it can be seen that there is a decrease in velocities up to 0.85% for all used distributions (A1, A2, A3, B1, B2, and C1).

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Section: Model Similitudementioning

confidence: 99%

Experimental Investigation of Energy Dissipation in Ogee Spillway Using New Distributions of Dissipation Blocks

Al-Fatlawi,

Al-Shuker

2023

E3S Web Conf.

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“…For example, some researchers examined the flow characteristics of the stepped spillways using box gabions (Peyras et al 1992;Wuthrich & Chanson 2015;Zuhaira et al 2020). Some researchers have also examined the amount of scouring downstream stepped spillways (Tuna & Emiroglu 2013;Aminpour & Farhoudi 2017;Eghlidi et al 2020). Felder et al (2012aFelder et al ( , 2012b) conducted many experimental studies about pooled stepped spillways that used different step heights and chute channel angles.…”

Section: Introductionmentioning

confidence: 99%

Stepped spillway design for energy dissipation

Ikinciogullari

2023

Water Supply

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Important water structures known as stepped spillways are used to dissipate energy, aerate rivers, and reduce the cost of the downstream pool. The aim of this study is to increase the energy dissipation rate by proposing an alternative design to the flat stepped spillways, which are frequently used in practice. For that reason, the Circular Stepped Spillway (CSS) has been constructed and numerically investigated in this paper. The energy dissipation rate of the CSS and the flat stepped spillway has been compared using three different models and discharges. According to the simulation findings, the CSS performs better as the step radius gets smaller. The CSS models with step depths of 0.50, 1.50, and 2.50 cm have dissipated up to 21.4, 38, and 50.7% more energy than the flat stepped spillway, respectively.

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“…Araştırmacıların bir kısmı, kutu gabyonlar kullanarak basamaklı dolusavaklar üzerindeki akım karakteristiklerini incelemişlerdir (Peyras vd., 1992;Wuthrich & Chanson, 2015;Zuhaira vd., 2020). Bir kısım araştırmacılar da basamaklı dolusavakların mansabında oluşan oyulmayı incelemişlerdir (Aminpour & Farhoudi, 2017;Eghlidi vd., 2020;Tuna & Emiroglu, 2013). Bilgisayar teknolojisinin gelişmesi ile hesaplamalı akışkanlar dinamiği (HAD) (Computational Fluid Dynamics-CFD) yöntemi, araştırmacıların ilgisini çekmiş ve basamaklı dolusavaklar üzerinde yapılan sayısal çalışmaların sayısı gün geçtikçe artmıştır.…”

Section: Introductionunclassified

Ters Basamaklı Eşikler Kullanılarak Tasarlanan Basamaklı Savakların Enerji Sönümleme Oranlarının Sayısal Olarak İncelenmesi

Ikinciogullari¹

2021

European Journal of Science and Technology

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ÖzBasamaklı savaklar, şüt kanalı üzerindeki akım enerjisini sönümleyebilmek amacıyla tasarlanan ve yüzyıllardır kullanılan bir savak çeşididir. Bu savakların geliştirilebilmesi amacıyla basamak geometrisi üzerine birçok çalışma yapılmış ve yapılmaya devam etmektedir. Bu çalışma kapsamında, basamak uçlarına eklenen ters basamak geometrisindeki eşiklerin enerji sönümleme oranına etkisi Flow3D ® yazılımı ile incelenmiştir. Üç farklı model ve altı farklı debi kullanılarak sürdürülen çalışmada toplam 18 adet analiz yürütülmüştür. Elde edilen sonuçlara göre, her bir basamak ucuna eklenen ters basamaklı eşiklerin, sıçramalı akım şartlarında, klasik basamaklı savaklardan %18'e kadar daha fazla enerji sönümleyebildiği, bu değerin nap akımı rejimine geçildikçe azaldığı gözlenmiştir.

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Effect of Step Geometry on Local Scour Downstream of Stepped Chutes

Cited by 24 publications

References 18 publications

Experimental Investigation of Energy Dissipation in Ogee Spillway Using New Distributions of Dissipation Blocks

Experimental Investigation of Energy Dissipation in Ogee Spillway Using New Distributions of Dissipation Blocks

Stepped spillway design for energy dissipation

Ters Basamaklı Eşikler Kullanılarak Tasarlanan Basamaklı Savakların Enerji Sönümleme Oranlarının Sayısal Olarak İncelenmesi

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