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Journal articles on the topic 'Spillway width'

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Published: 4 June 2021

Last updated: 3 February 2022

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1

Tacail, François G., Barry Evans, and Alan Babb. "Case study of a labyrinth weir spillway." Canadian Journal of Civil Engineering 17, no. 1 (1990): 1–7. http://dx.doi.org/10.1139/l90-001.

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A labyrinth weir is an effective and economical means of providing increased spillway capacity under some restricted operating conditions. This type of weir is particularly suited to reservoir sites where a low head to high discharge relation is required, the topography restricts the spillway width, and a self-operating structure is highly desirable for emergency operation. Over the past few decades, labyrinth weir spillways have been constructed throughout the world. Definitive guidelines and theoretical procedures pertaining to hydraulic design of this type of weir are not completely establi

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2

Luna-Bahena, Juan, Oscar Pozos-Estrada, Víctor Ortiz-Martínez, and Jesús Gracia-Sánchez. "Experimental Investigation of Artificial Aeration on a Smooth Spillway with a Crest Pier." Water 10, no. 10 (2018): 1383. http://dx.doi.org/10.3390/w10101383.

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Crest piers placed on overflow spillways induce standing waves at the downstream end of them and the supercritical flow expands after flowing past the rear of the pier. The expanding flow from each side of a pier will intersect and form disturbances or shock waves that travel laterally as they move downstream and eventually reach the chute sidewalls. Recently, investigations regarding crest piers are related with artificial aeration on stepped spillways to eliminate the risk of cavitation damage. However, there is a lack of studies on standing and shock waves in smooth spillways concerning the

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3

Hassanzadeh Vayghan, Vahid, Ali Saber, and Soroosh Mortazavian. "Modification of Classical Horseshoe Spillways: Experimental Study and Design Optimization." Civil Engineering Journal 5, no. 10 (2019): 2093–109. http://dx.doi.org/10.28991/cej-2019-03091396.

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Investigation of the hydraulic aspects of spillways is one of the important issues regarding hydraulic structures. This study presents a modified horseshoe spillway (MHS) constructed by adding a flow passage and an internal weir in the bed of a classical horseshoe spillway (CHS). This modification increased the discharge efficiency and eliminated the rooster-tail hydraulic jump in CHSs. Eighteen laboratory-scale MHSs in various geometric sizes, six various CHSs, and a rectangular weir of the same width were constructed and tested under the same flow conditions. Results showed that in terms of

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4

Moran, Rafael, Miguel Ángel Toledo, Javier Peraita, and Raffaella Pellegrino. "Energy Dissipation in Stilling Basins with Side Jets from Highly Convergent Chutes." Water 13, no. 10 (2021): 1343. http://dx.doi.org/10.3390/w13101343.

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Spillways with Highly Converging Chutes (HCCs) are a non-conventional alternative that can be applied to achieve a higher outflow capacity when the weir length exceeds the width of the valley at the toe of gravity or arch dams. This kind of spillway has been used in the past, but no general studies have yet been published. This article summarizes experimental research work aiming to increase the knowledge of the effect of some design parameters of HCCs on the energy dissipation in the stilling basin at the toe of the dam. As a comparison reference, we use the Type I stilling basins, widely kno

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5

Bigillon, Françoise, Aslak Løvoll, and Bård Venås. "Multiple analysis approach for the design of the labyrinth spillway on the Nam Teng river, Myanmar: Concept design - CFD - physical model." E3S Web of Conferences 40 (2018): 05050. http://dx.doi.org/10.1051/e3sconf/20184005050.

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This paper presents the results of a combined approach - concept design, Computational Fluid Dynamics (CFD) simulations and physical model test - to design a spillway on the Nam Teng River in Myanmar. The spillway includes a 140 m wide labyrinth weir which ensures that the PMF flow QPMF=6800 m3/s passes with a maximum head of 5.5 m. The width required to pass PMF flow for a conventional ogee shaped weir is ca. 200m. The design of the spillway is based on design recommendations for labyrinth weirs from Tullis [1] and USBR guidelines to design the chute, stilling basin and outfall channel that l

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6

ELISTRATOV, A. S. "SELECTION OF THE MOST FAVORABLE MODE OF OPERATION OF THE SURFACE SPILLWAY ACCORDING TO THE CONDITIONS OF SOIL EROSION IN THE LOWER POND BY THE EXAMPLE OF THE BOGUCHANSKAYA HYDROELECTRIC POWER PLANT (GES)." Prirodoobustrojstvo, no. 3 (2021): 95–103. http://dx.doi.org/10.26897/1997-6011-2021-3-95-103.

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The work of the spillway variant No. 2 of the Boguchanskaya HPP (GES) with a smooth drain face with a jump-bucket for jet discharge into the lower pond is considered. The disadvantage of the Boguchansky dam layout with a spillway No. 2 is its close adjoining to the HPP building and the absence of the separation wall between them preventing from the influence of its operation on the work of HPP. One of the ways to reduce this influence is to remove the left border of the discharge fl ow from the HPP water area. To implement this task there is considered a variant with a planned deviation of the

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7

Cheng, Xiang Ju, and Wen Qian Zhao. "Experimental Study of DO Mass Transfer over Roughened Spillway." Advanced Materials Research 512-515 (May 2012): 2304–7. http://dx.doi.org/10.4028/www.scientific.net/amr.512-515.2304.

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Spillways or chutes have been used for over 3000 years. Recently, new construction materials and design techniques have increased the interest in spillways and chutes to increase dissolved oxygen concentration in water, especially for contaminated city rivers. A series of laboratory experiments were operated to obtain the efficiency of DO mass transfer over roughened spillway. Two kinds of roughened spillway were considered, i.e., stepped and semi-balled spillways. By means of measuring the DO concentration at the crest and downstream of spillways, the experimental results showed that the more

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8

Faudli, Imam, Azmeri Azmeri, and Cut Dwi Refika. "Analisis Kavitasi pada Saluran Transisi dan Peluncur Pelimpah Bendungan Kluet – Model Fisik Skala 1:60." Jurnal Teknik Sipil 28, no. 2 (2021): 173–78. http://dx.doi.org/10.5614/jts.2021.28.2.6.

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River Region of Baru-Kluet has a steep slope contour and high rainfall so that it is vulnerable to flooding while during the dry season rice fields experience drought due to lack of water. Therefore, a dam is built to mitigate these issues. The spillway is a flow-control component in the dam which is used to improve regulation and enlarge the flow rate that will cross the spillway building. Spillway that has a steep slope is vulnerable to hydraulic behavior called cavitation. The experiment was carried out at the River and Coast Laboratory of Syiah Kuala University, Indonesia. This study aims

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9

Hassanzadeh Vayghan, Vahid, Mirali Mohammadi, and Ali Ranjbar. "Experimental Study of the Rooster Tail Jump and End Sill in Horseshoe Spillways." Civil Engineering Journal 5, no. 4 (2019): 871–80. http://dx.doi.org/10.28991/cej-2019-03091295.

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In a horseshoe spillways, due to the collision of the falling nappes from their surround walls, in the center of spillway’s trough, a spatial hydraulic jump is formed that named “rooster tail”. This study by using the physical model of horseshoe spillway, investigates the form, height and length of rooster tail jump. Based on the analytical methods, the effective parameters on rooster tail jump’s height and height were determined and their interaction was investigated and linear relationships were proposed to predict jump’s length and height. By increasing the amount of water on the spillway’s

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10

Chu, Kejian, Zulin Hua, and Lijun Ji. "AERATION AT OVERFLOW DAMS WITH CURVED SURFACES BY DIFFERENT FLASHBOARD SPILLWAYS." JOURNAL OF ENVIRONMENTAL ENGINEERING AND LANDSCAPE MANAGEMENT 22, no. 3 (2014): 226–36. http://dx.doi.org/10.3846/16486897.2014.901226.

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Aeration using overflow dams is an eco-friendly and economical method of improving dissolved oxygen levels in polluted urban streams. Laboratory investigations of aeration performance in smooth spillways, as well as in parallel flashboard and interlaced flashboard spillways with different flashboard intervals, for overflow dams with curved surfaces have been conducted separately. Aeration efficiencies of the different types of spillways, in particular the effects of varying discharge rate, total spillway height, and flashboard interval, have been discussed in detail. The test data illustrate t

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11

Chanson, Hubert. "Stepped spillway flows and air entrainment." Canadian Journal of Civil Engineering 20, no. 3 (1993): 422–35. http://dx.doi.org/10.1139/l93-057.

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Stepped spillways have become a popular method for handling flood releases. The steps significantly increase the rate of energy dissipation taking place on the spillway face and reduce the size of the required downstream energy dissipation basin. The compatibility of stepped spillways with roller compacted concrete and gabion construction techniques results in low additional cost for the spillway. This paper presents a review of recent developments for the design of stepped spillways, provides a discussion of the effects of air entrainment, and presents new calculation methods that take into a

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12

Teng, Penghua, and James Yang. "CFD modeling of two-phase flow of a spillway chute aerator of large width." Journal of Applied Water Engineering and Research 4, no. 2 (2016): 163–77. http://dx.doi.org/10.1080/23249676.2015.1124030.

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13

Razavi, Amir Reza, and Hassan Ahmadi. "Study on the Compaction Effect Factors of Lime-treated Loess Highway Embankments." Civil Engineering Journal 3, no. 11 (2017): 1133. http://dx.doi.org/10.28991/cej-030943.

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Morning-glory spillways are usually used in dams constructed in narrow valleys or those on steeply sloped supports. Furthermore, one can adopt this type of spillway in cases where guiding and diversion tunnels of adequate diameter are available. One of positive characteristics of these spillways is that, their maximum capacity can be approached at relatively low head. This characteristic can be seen as an advantage in cases wherein maximum outflow from the spillway shall be limited. On the other hand, should water head on top of the spillway exceeds the project baseline head, changes in output

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14

Wan, Wuyi, Awais Raza, and Xiaoyi Chen. "Effect of Height and Geometry of Stepped Spillway on Inception Point Location." Applied Sciences 9, no. 10 (2019): 2091. http://dx.doi.org/10.3390/app9102091.

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Air entrainment in a stepped spillway is very important to protect the spillway from cavitation damage. The inception point is the location where air starts entering the non-aerated flow zone. The inception point location depends on different parameters, such as the discharge, step height, and step shape. In this paper, various stepped spillways, including flat steps, pooled steps, and round steps with different step heights were numerically simulated using the volume of fluid and realizable k-ε models. The results indicate that the inception point location moves downwards with the increase of

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15

Raza, Awais, Wuyi Wan, and Kashif Mehmood. "Stepped Spillway Slope Effect on Air Entrainment and Inception Point Location." Water 13, no. 10 (2021): 1428. http://dx.doi.org/10.3390/w13101428.

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Spillway is a crucial hydraulic structure used to discharge excess water from the dam reservoir. Air entrainment is essential to prevent cavitation damage on the spillway, however, without air entrainment the risk of cavitation over the spillway increases. The most important parameter for the determination of air entrainment in stepped spillways is the inception point. The inception point is the location where the air starts to inter into the water flow surface over the spillway. It occurs when the turbulent boundary layer meets the free surface. The location of the inception point depends upo

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16

Chanson, H. "History of stepped channels and spillways: a rediscovery of the “wheel”." Canadian Journal of Civil Engineering 22, no. 2 (1995): 247–59. http://dx.doi.org/10.1139/l95-034.

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Recently, spillways with a stepped profile have regained interest and favor among design engineers to pass flood waters over the dams. The stepped geometry enhances the energy dissipation above the spillway and reduces the size of a downstream stilling basin. In this paper, the author shows that the technique of stepped channels has been developed since Antiquity. Spillways and irrigation channels with stepped profiles were developed by several civilisations around the Mediterranean sea and in America. The main characteristics of the stepped spillways along the ages suggest a regular evolution

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17

Feng, Maoyuan, and Pan Liu. "Spillways Scheduling for Flood Control of Three Gorges Reservoir Using Mixed Integer Linear Programming Model." Mathematical Problems in Engineering 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/921767.

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This study proposes a mixed integer linear programming (MILP) model to optimize the spillways scheduling for reservoir flood control. Unlike the conventional reservoir operation model, the proposed MILP model specifies the spillways status (including the number of spillways to be open and the degree of the spillway opened) instead of reservoir release, since the release is actually controlled by using the spillway. The piecewise linear approximation is used to formulate the relationship between the reservoir storage and water release for a spillway, which should be open/closed with a status de

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18

Kells, James A., and C. D. Smith. "Reduction of cavitation on spillways by induced air entrainment." Canadian Journal of Civil Engineering 18, no. 3 (1991): 358–77. http://dx.doi.org/10.1139/l91-047.

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Spillways for medium and high head dams may be exposed to high velocity flows and the associated destructive phenomenon of cavitation. Cavitation may occur at rough spots in the surface of the chute or tunnel, at local discontinuities in the finished surface such as construction joints, and at locations along critical flow profiles having significant deviations from design specifications. This paper addresses, on the basis of a review of the literature, a method for preventing or reducing cavitation damage on spillways through the use of spillway aerators. While the ability of induced or force

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19

Zerrouk, Nacer Eddine, and Claude Marche. "Les évacuateurs de crues en labyrinthe : dimensionnement, fonctionnement, exemples et particularités." Canadian Journal of Civil Engineering 22, no. 5 (1995): 916–24. http://dx.doi.org/10.1139/l95-108.

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The purpose of this paper is to demonstrate that labyrinth spillways can be a better option than rectilinear ones. The stages that have led to development of the labyrinth spillway are briefly reviewed as are applicable design and calculation principles. Discharge flow diagrams given by Hay and Taylor, Darvas, Lux and Hinchliff, and Magalhaes and Lorena for a trapezoidal labyrinth weir are compared. Calculation procedures and design diagrams were automated, making it possible to study flood routing through a labyrinth spillway and compare its performance to that of an equivalent rectilinear sp

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20

Ashoor, Abdelwanees, and Amin Riazi. "Stepped Spillways and Energy Dissipation: A Non-Uniform Step Length Approach." Applied Sciences 9, no. 23 (2019): 5071. http://dx.doi.org/10.3390/app9235071.

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A stepped spillway, which is defined as a spillway with steps on the chute, can be used to improve the energy dissipation of descending water. Although uniform stepped spillways have been studied comprehensively, non-uniform stepped spillways need more attention. In the interest of maximum energy dissipation, in this study, non-uniform stepped spillways were investigated numerically. To this end, within the range of skimming flow, four different types of non-uniform step lengths, including convex, concave, random, and semi-uniform configurations, were tested in InterFOAM. To evaluate the influ

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21

Enjilzadeh, Mohammad Reza, and Ebrahim Nohani. "Numerical Modeling of Flow Field in Morning Glory Spillways and Determining Rating Curve at Different Flow Rates." Civil Engineering Journal 2, no. 9 (2016): 448–57. http://dx.doi.org/10.28991/cej-2016-00000048.

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Morning glory spillways with drop inlets are normally employed in dams built on narrow valleys or placed on steep slopes. In Iran, morning glory spillways have been commonly used in large Dam projects such as Sefidrood dam, Alborz dam, and Haraz dam. Physical models should be built to accurately determine hydraulic parameters of the flow and flow field in spillways. Establishment of a physical model involves extravagant costs and conditions that cannot be justified in some cases. Therefore, suitable numerical models can be proposed for such circumstances. Using FLOW3D numerical models, 3-dimen

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22

Bai, Zhaoliang, and Jianmin Zhang. "Comparison of Different Turbulence Models for Numerical Simulation of Pressure Distribution in V-Shaped Stepped Spillway." Mathematical Problems in Engineering 2017 (2017): 1–9. http://dx.doi.org/10.1155/2017/3537026.

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V-shaped stepped spillway is a new shaped stepped spillway, and the pressure distribution is quite different from that of the traditional stepped spillway. In this paper, five turbulence models were used to simulate the pressure distribution in the skimming flow regimes. Through comparing with the physical value, the realizablek-εmodel had better precision in simulating the pressure distribution. Then, the flow pattern of V-shaped and traditional stepped spillways was given to illustrate the unique pressure distribution using realizablek-εturbulence model.

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23

Mohammadpour Zalaki, Sajjad, Hosein Fathian, Ebrahim Zalaghi, and Farhad Kalantar Hormozi. "Investigation of hydraulic parameters and cavitation in Kheir Abad flood release structure." Canadian Journal of Civil Engineering 42, no. 4 (2015): 213–21. http://dx.doi.org/10.1139/cjce-2014-0409.

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The simulation of flow behaviors before the construction of spillways using physical model and simulating packages is a crucial task. This paper investigates the flow behaviors in Kheir Abad flood release structure on Ab Shirin River, Iran by using Flow3D software and the results were compared with those of the physical model. First, by setting up a virtual model of spillway, the software performance was verified and calibrated. Then, by entering different flow discharge values, the two-dimensional flow hydraulics through the spillway was simulated by the software and flow depths, velocities a

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24

GURJEV, A. P., M. M. CHUMICHEVA, O. V. МАREEVA, A. S. VERHOGLYADOVA, and A. BRAKENI. "STILLING BASIN WITH A FLOW SWIRLING." Prirodoobustrojstvo, no. 1 (2021): 79–86. http://dx.doi.org/10.26897/1997-6011-2021-1-79-86.

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In the given materials there is given an analysis of the operation of existing constructions of devices for dissipation of excess energy of idle water discharges at hydraulic engineering facilities. The most applied design for dissipation of fl ow energy in the practice of hydraulic building in the world is stilling basins with straight axis made in prismatic or trapezoidal shapes which is appealing in their simplicity. The main disadvantage of these stilling wells in case of their using together with tubular spillways, especially having several strings, is practical impossibility to provide u

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25

Morovati, Khosro, Afshin Eghbalzadeh, and Saba Soori. "Study of Energy Dissipation of Pooled Stepped Spillways." Civil Engineering Journal 2, no. 5 (2016): 208–20. http://dx.doi.org/10.28991/cej-2016-00000027.

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Water transferring to the dam downstream creates high levels of kinetic energy. Stepped spillways are amongst the most effective spillways in reducing the kinetic energy of the flow moving towards the downstream. The geometry of the steps in stepped spillways can affect the reduction of kinetic energy of the flow transferring to the downstream. Therefore, in this study the effect of different number of steps and discharge on flow pattern especially energy dissipation were investigated. The VOF method was used to simulate the flow surface and the k-ε (RNG) turbulence model was used for flow tur

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26

Heidari, Ali, and Poria Ghasemi. "Evaluation of step�s slope on energy dissipation in stepped spillway." International Journal of Engineering & Technology 3, no. 4 (2014): 501. http://dx.doi.org/10.14419/ijet.v3i4.3561.

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Stepped spillways are kind of dissipative structures used in rivers with steep slopes to reduce the flow energy and also the scouring potential of water. This dissipation is caused through diffusion along the spillway. The reduction of energy also leads to optimize the still basin geometry and performance downstream, and thus make the project more economic. In this paper, the hydraulic behaviour of stepped spillway is investigated based on kinetic energy. The results show that the average mean kinetic energy decreases upon an appraise in stepss slope. Finally, horizontal steps are proposed. Ke

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27

Razavi, Amir Reza, and Hassan Ahmadi. "Numerical Modelling of Flow in Morning Glory Spillways Using FLOW-3D." Civil Engineering Journal 3, no. 10 (2017): 956. http://dx.doi.org/10.28991/cej-030928.

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Suspended load amount with flow is one of the factors which are disregarded in designing morning glory spillways. It is due to the fact that physical modeling of sediment load with flood flow is very difficult and costly. Suspended sediments load with flow can change the density of passing water, leading to changing most of assumptions existing in spillways' design. With its unique potential to model dense flows and flows contain suspended loads, numerical model of FLOW-3D can provide valuable information in this regard. In the present study, flow was calibrated and validated using FLOW-3D thr

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28

Wadhai, Prafull, Aniruddha Ghare, Narendra Deshpande, and Avinash Vasudeo. "Comparative analysis for estimation of the height of training wall of convergent stepped spillway." International Journal of Engineering & Technology 4, no. 2 (2015): 294. http://dx.doi.org/10.14419/ijet.v4i2.4312.

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For a dam system with inadequate capacity of spillway, provision of (RCC) roller compacted concrete stepped spillways with converging training walls prove to be an appropriate alternative. Sufficient number of guidelines and literature references are available on the design of straight side walled stepped spillways. The need was felt to conduct the experiments on stepped spillways with convergent training walls, as limited literature is available. This paper presents the comparative analysis of an experimentation conducted on flow over convergent stepped spillways having 1:1 chute slope with 4

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29

Zhou, Yu, Jianhua Wu, Fei Ma, and Jianyong Hu. "Uniform flow and energy dissipation of hydraulic-jump-stepped spillways." Water Supply 20, no. 4 (2020): 1546–53. http://dx.doi.org/10.2166/ws.2020.056.

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Abstract In skimming flow, a uniform flow can be achieved and the flow depth, velocity and air concentration remain constant if a stepped spillway is sufficiently long. In this study, physical model experiments were performed to investigate the uniform characteristics and energy dissipation of a hydraulic-jump-stepped spillway, which is a new type of stepped spillway for increasing the unit discharge capacity and energy dissipation. Based on the redefinition of uniform flow, experimental results show that at a given stepped spillway slope, a smaller height for the beginning of the uniform flow

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30

Chu, Ke Jian, Zu Lin Hua, Li Gu, Xiao Dong Liu, and Qi Ming Li. "Experimental Investigation on Reaeration Performance in Parallel Flashboard Spillway." Advanced Materials Research 347-353 (October 2011): 2375–79. http://dx.doi.org/10.4028/www.scientific.net/amr.347-353.2375.

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The reaeration performance in smooth and parallel flashboard spillways with 3cm, 6cm and 9cm board space over curve dams has been experimentally investigated respectively. Reaeration efficiencies of different types of spillways, in particular the effects of varying discharge rate of overflow and drop-water depth have been taken account in detail. The test data illustrates that the reaeration efficiency increases with increasing drop-water depth, and decreases with increasing discharge current; the flashboard spillways appear to offer markedly higher reaeration efficiency than the smooth spillw

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31

Montazar, A., and S. A. Salehi Neyshabori. "Impacts of some parameters affecting the hydraulic performance of U-shaped side spillways." Canadian Journal of Civil Engineering 33, no. 5 (2006): 552–60. http://dx.doi.org/10.1139/l06-009.

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Side channel spillways are one type of outlet works at dams with wide applications in irrigation and drainage systems and in water and wastewater facilities. When the flow enters the side channel through the end and two side weirs of the spillway, it is called a three-sided spillway. Based on the results of laboratory experiments, the present study investigates the impacts of variation in end-sill elevation and location and the bed slope of the side channel for different inflow rates into a spillway. In these evaluations, variation in flow regime is taken as a qualitative index and the flow tu

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32

OGBOGU, SYLVESTER, and WILLIAMS ADU. "Life history and larval density of Cheumatopsyche digitata Mosely (Trichoptera: Hydropsychidae) in Opa Reservoir spillway, Ile-Ife, southwestern Nigeria." Zoosymposia 5, no. 1 (2011): 401–7. http://dx.doi.org/10.11646/zoosymposia.5.1.32.

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The life history and density of Cheumatopsyche digitata Mosely (Trichoptera: Hydropsychidae) were examined below Opa Reservoir in Ile-Ife, southwestern Nigeria. This caddisfly is the only species that occurs immediately below the impoundment auxiliary spillway where it closely associates with an aquatic bryophyte, Fontinalis sp. We collected larvae every month between July 2004 and June 2005 as long as larvae were available in the study site. The instar growth ratio was fairly constant and ranged from 1.198 to 1.402 (mean ± standard error = 1.285 ± 0.073) but mean head capsule width increased

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33

Balioti, Vasiliki, Christos Tzimopoulos, and Christos Evangelides. "Multi-Criteria Decision Making Using TOPSIS Method Under Fuzzy Environment. Application in Spillway Selection." Proceedings 2, no. 11 (2018): 637. http://dx.doi.org/10.3390/proceedings2110637.

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The selection of an appropriate spillway has a significant effect to the construction of a dam and several procedures and considerations are needed. In the past, this selection of the type of the spillway was arbitrary and sometimes with bad results. Recently the Multiple Criteria Decision Making theory has given the possibility to make a decision about the optimum form of a spillway under complex circumstances. In this paper, the above method is used and especially the TOPSIS (Technique for Order Preference by Similarity to Ideal Solution) method for the selection of a spillway for a dam in t

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34

Peng, Zhang, Yuan, et al. "Energy Dissipation in Stepped Spillways with Different Horizontal Face Angles." Energies 12, no. 23 (2019): 4469. http://dx.doi.org/10.3390/en12234469.

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Energy dissipation is one of the most important factors in choosing stepped spillways. However, very few studies have investigated energy dissipation with different horizontal face angles. In this paper, the realizable k-ε turbulent model was used to study the flow field, energy dissipation rates and turbulent kinetic energy and its dissipation rate for different stepped spillways with five horizontal face angles in the skimming flow regions. Results showed that the field and direction of the flow were changed by the horizontal face angles of the stepped spillway, which produced some unique ch

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35

Dong, Wang, Vetsch, Boes, and Tan. "Numerical Simulation of Air–Water Two-Phase Flow on Stepped Spillways Behind X-Shaped Flaring Gate Piers under Very High Unit Discharge." Water 11, no. 10 (2019): 1956. http://dx.doi.org/10.3390/w11101956.

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Stepped spillways are commonly used under relatively low unit discharge, where cavitation pitting can be avoided by self-aerated flow. However, there are several dams in China with stepped spillways in combination with X-shaped flaring gate piers with unit design discharge considerably larger than specified in the available guidelines. Consequently, air–water two-phase flow on stepped spillway behind X-shaped flaring gate piers under very high unit discharge was investigated using Computational Fluid Dynamics (CFD) simulations. The 3-D Reynolds-averaged Navier–Stokes equations were solved, inc

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36

Zhang, Jing, Qinghua Zhang, Tiantian Wang, Jinmeng Yang, and Xuemei Li. "Research on the water level in a bending channel using a guide wall." Water Supply 19, no. 8 (2019): 2494–506. http://dx.doi.org/10.2166/ws.2019.130.

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Abstract In order to study the water level at the convex and concave banks after installing a guide wall in a spillway chute bend, with the original condition that the Fr at the entrance of the channel bend is larger than 1.0 (supercritical flow) when there is no the guide wall, systematic experiments with the guide wall were conducted for three radii (2.4B, 3.2B and 4B; B is the width of the channel), bottom slopes (0.01, 0.005 and 0.02), and discharges (50, 100 and150 m3 h−1). Results show that, firstly, after installing a guide wall, the Fr becomes smaller and even lower than 1.0, which mea

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Mousavimehr, S. M., Omid Aminoroayaie Yamini, and M. R. Kavianpour. "Performance Assessment of Shockwaves of Chute Spillways in Large Dams." Shock and Vibration 2021 (February 20, 2021): 1–17. http://dx.doi.org/10.1155/2021/6634086.

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Spillways are the most important structures of large dams that are responsible for releasing the excessive flood discharge from the reservoir. Although many studies have been performed to determine the flow characteristics over these structures, however, the available information on the shockwaves’ characteristics for spillways’ design is limited. The supercritical flow below the chute piers generates an aerated flow known as shockwaves. Due to the flow interaction with the chute piers, three kinds of standing waves just downstream of the pier, in the middle of the chute, and on the sidewalls

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Fadaei-Kermani, E., G. A. Barani, and M. Ghaeini-Hessaroeyeh. "Numerical Detection of Cavitation Damage on Dam Spillway." Civil Engineering Journal 2, no. 9 (2016): 484–90. http://dx.doi.org/10.28991/cej-2016-00000051.

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The present paper deals with the numerical detection of cavitation damage level and location on dam spillways. At first, flow over a spillway was simulated using the computational fluid dynamics method. The flow characteristics such as pressure, velocity and depth through the spillway have been calculated for five different flow rates. Since the actual flow is turbulent, the RNG turbulence model has been used for simulation. The numerical results of flow characteristics including flow depth, velocity and pressure were compared with the available results of the hydraulic model tests. The numeri

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Pelikán, Petr, and Jana Marková. "The use of Regression Triplet in Hydraulic Modelling on the Example of Determination of Overfall Coefficient." Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 64, no. 2 (2016): 497–502. http://dx.doi.org/10.11118/actaun201664020497.

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The paper is focused on a hydraulic problem of water overfall on hydrotechnic structures, especially outlets and spillways of water reservoirs. The main parameter of such structures is its discharge capacity depending on overfall coefficient, dimensions of spillway, gravitational constant and height of overflowing water jet. The aim of investigation was the mathematical derivation of formula for calculation of overfall coefficient for sharp-crested spillway from observed data. The problem was solved with the aid of statistical method of nonlinear regression analysis, Gauss-Newton algorithm (no

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Kurzekar, Ujwal. "Design of Kawlewada Dam and its Components." International Journal for Research in Applied Science and Engineering Technology 9, no. VII (2021): 100–108. http://dx.doi.org/10.22214/ijraset.2021.36245.

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This paper presents the design and stability analysis of Kawlewada dam (a concrete gravity dam situated in kawlewada village of gondia district) and its components. Through, the demanding years, it has been observed that failures of dams due to many factors are common. So, it is the essential to analysis the various components, parts of dam against all its modes of failures, forces acting on it, uncontrollable disasters such as earthquake, disaster, etc. For this, the preliminary data of the dam required for design, such as control levels, dimensions, crest width, base width, etc. was collecte

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Roushangar, Kiyoumars, Ali Foroudi, and Mojtaba Saneie. "Influential parameters on submerged discharge capacity of converging ogee spillways based on experimental study and machine learning-based modeling." Journal of Hydroinformatics 21, no. 3 (2019): 474–92. http://dx.doi.org/10.2166/hydro.2019.120.

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Abstract Ogee spillways with converging training walls are applied to lower the hazard of accidental flooding in locations with limited construction operations due to their unique structure. Hence, this type of structure is proposed as an emergency spillway. The present study aimed at experimental and machine learning-based modeling of the submerged discharge capacity of the converging ogee spillway. Two experimental models of Germi-Chay dam spillway were utilized: one model having a curve axis which was made in 1:50 scale and the other with a straight axis in 1:75 scale. Using visual observat

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Almawla, Atheer Saleem, Ammar Hatem Kamel, and Assim Mohammed Lateef. "Modelling of Flow Patterns over Spillway with CFD (Case Study: Haditha Dam in Iraq)." International Journal of Design & Nature and Ecodynamics 16, no. 4 (2021): 373–85. http://dx.doi.org/10.18280/ijdne.160404.

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Spillways are designing to release surplus water over a volume of storage. The excess water flows from the top of the reservoir and is carried back to the river by a spillway. Many radial gates were destroyed under hydrodynamic load. Radial gate connectors are susceptible to fatigue failure due to excessive vibration; therefore, gate vibration during operation must be investigated to confirm safe operation at the design water pressure. Several studies were carried out to analyse and simulation of flow over the spillway. In this article, the flow pattern over the Haditha dam spillway has been s

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Jafari-Nodoushan, Ehsan, Khosrow Hosseini, Ahmad Shakibaeinia, and Seyed-Farhad Mousavi. "Meshless particle modelling of free surface flow over spillways." Journal of Hydroinformatics 18, no. 2 (2015): 354–70. http://dx.doi.org/10.2166/hydro.2015.096.

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A meshless Lagrangian (particle) method based on the weakly compressible moving particle semi-implicit formulation (WC-MPS) is developed and analysed for simulation of flow over spillways. To improve the accuracy of the model for pressure and velocity calculation, some modifications are proposed and evaluated for the inflow and wall boundary conditions implementation methods. The final model is applied for simulation of flow over the 45° and 60° ogee spillways (with different inflow rates) and also shallow flow over a spillway-like curved bed channel. To evaluate the model, the numerical resul

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Chanson, Hubert. "Aeration and deaeration at bottom aeration devices on spillways." Canadian Journal of Civil Engineering 21, no. 3 (1994): 404–9. http://dx.doi.org/10.1139/l94-044.

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Aeration devices are introduced along chute spillways and at bottom outlets to prevent cavitation damage in high velocity flows. Bottom aerators are characterized by large quantities of air entrained along the jet interfaces and also by a strong deaeration process near the impact of the water jet with the spillway bottom. In this paper, the aeration and deaeration occurring respectively in the aeration region and in the impact region are reviewed. A reanalysis of air concentration data obtained on models provides information on the flow characteristics at the end of the impact region. These re

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Sujono, Joko. "Hydrological Analysis of the Situ Gintung Dam Failure." Journal of Disaster Research 7, no. 5 (2012): 590–94. http://dx.doi.org/10.20965/jdr.2012.p0590.

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Early on the morning ofMarch 27, 2009, the Situ Gintung dam, located near Jakarta, Indonesia, and with an catchment area of 3.1 km2, failed and flooded the area below it. This disaster has awakened most of the Indonesian people, especially those who are concerned about hydraulic structures, natural disasters and sustainable water resources management. During the disaster, about 100 people died and a number of people went missing. There are hundreds of dams like the Situ Gintung dam and other big dams have been built in Indonesia. Most of these dams pose a high potential hazard to life and prop

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Wera, Fiona-Annilow, Teck-Yee Ling, Lee Nyanti, Siong-Fong Sim, and Jongkar Grinang. "Effects of Opened and Closed Spillway Operations of a Large Tropical Hydroelectric Dam on the Water Quality of the Downstream River." Journal of Chemistry 2019 (January 13, 2019): 1–11. http://dx.doi.org/10.1155/2019/6567107.

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Water quality downstream of a hydroelectric dam is potentially affected by dam operations and other land uses in the river basin. Previous short-distance studies below the large Bakun Dam indicated poorer water quality during closed spillway. However, the extent of the impact is still unknown. Such knowledge is essential for mitigating the impact of the dam. Thus, the objectives of this study were to determine the water quality up to a distance of 210 km under two spillway operations, namely, closed and opened spillways, and also to determine the changes in water quality from the predam condit

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Bung, Daniel, and Daniel Valero. "Re-Aeration on Stepped Spillways with Special Consideration of Entrained and Entrapped Air." Geosciences 8, no. 9 (2018): 333. http://dx.doi.org/10.3390/geosciences8090333.

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As with most high-velocity free-surface flows, stepped spillway flows become self-aerated when the drop height exceeds a critical value. Due to the step-induced macro-roughness, the flow field becomes more turbulent than on a similar smooth-invert chute. For this reason, cascades are oftentimes used as re-aeration structures in wastewater treatment. However, for stepped spillways as flood release structures downstream of deoxygenated reservoirs, gas transfer is also of crucial significance to meet ecological requirements. Prediction of mass transfer velocities becomes challenging, as the flow

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Li, Dengsong, Qing Yang, Xudong Ma, and Guangqing Dai. "Case Study on Application of the Step with Non-Uniform Heights at the Bottom Using a Numerical and Experimental Model." Water 10, no. 12 (2018): 1762. http://dx.doi.org/10.3390/w10121762.

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Steps effectively dissipate the energy of water along a path and reduce the size of the stilling basin but are rarely used in curved spillways. The shore spillway of a reservoir, which is restricted by topography, must be arranged in a curved shape. At high flow velocity and low water depth, some areas of the base plate of the curved spillway were not covered by the water. The water flow into the stilling basin did not form a submerged hydraulic jump. It was proposed that a step with bottom non-uniform heights be placed in the smooth base plate of the curved spillway to improve these undesirab

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Wilson, John W., Albert E. Giorgi, and Lowell C. Stuehrenberg. "A Method for Estimating Spill Effectiveness for Passing Juvenile Salmon and Its Application at Lower Granite Dam on the Snake River." Canadian Journal of Fisheries and Aquatic Sciences 48, no. 10 (1991): 1872–76. http://dx.doi.org/10.1139/f91-221.

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Juvenile salmonids migrating down the Snake and Columbia rivers in the northwestern United States pass each of the rivers' hydroelectric dams via either the powerhouse or the spillway. Spill effectiveness, the proportion of juveniles passing through the dam via the spillway, is important to fishery managers seeking to minimize the exposure of fish to turbines. We outline a method for estimating spill effectiveness and its sampling variance using a multinomial model with categories defined on the basis of information recovered from radio tagged fish. We applied this method to data from tagged c

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Aghebatie, Behrouz, and Khosrow Hosseini. "Investigation on slug flow phenomenon in Alborz morning glory spillway and preventing its destructive effects." International Journal of Modern Physics C 31, no. 06 (2020): 2050084. http://dx.doi.org/10.1142/s0129183120500849.

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Slug flow is a flow pattern which occurs in conveyance systems containing a two phase-fluid flow. Large air bubbles entrapped along these systems interrupt the flow and conduct to undesirable pressures and their fluctuations. Most of the previous concerning studies on slug flow phenomenon were performed in micro-channels with small scales in which the expansion of the air bubbles was negligible. In contrast, we investigated the systems with large pressure drops which conduct to abrupt increases on the volume of air phase. In this research, the verification tests applying CFD techniques were pe

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