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Journal articles on the topic 'Weirs'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Yousif, Omed S. Q., and Moses Karakouzian. "Effect of Corner Shape on Hydraulic Performance of One-Cycle Rectangular Labyrinth Weirs." Fluids 5, no. 3 (2020): 117. http://dx.doi.org/10.3390/fluids5030117.

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The hydraulic performance of rectangular labyrinth weirs has been investigated by many researchers, however, the effects of the corner shape on the hydraulic performance of rectangular labyrinth weirs have not been addressed in the current literature. Accordingly, this experimental study aims to explore the effect of the corner shape of on discharge efficiency of rectangular labyrinth weirs. Five flat-crested rectangular labyrinth weirs, with five different corner shapes, were made of High-Density Polyethylene Plastic (HDPE) and tested in a rectangular flume. Under different overflow discharge

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2

Ghazizadeh, Farhad, and M. Azhdary Moghaddam. "An Experimental and Numerical Comparison of Flow Hydraulic Parameters in Circular Crested Weir Using Flow3D." Civil Engineering Journal 2, no. 1 (2016): 23–37. http://dx.doi.org/10.28991/cej-2016-00000010.

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Circular crested weirs consist of a circular crested of upstream and downstream walls. These weirs are widely used in hydraulic engineering as water discharge structures and can be used to control water level in channels and tanks. In the present study, using Flow3D software, hydraulic properties were investigated to find weir geometry optimization through CFD method. Also, this study attempted to investigate flow on some sections of circular crested weirs in 3 groups and 11 models. Upstream and downstream slope changes as well as the height of the weir were also studied. To validate the model

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3

Emiroglu, M. "Estimating Flow Characteristics of Different Weir Types and Optimum Dimensions of Downstream Receiving Pool." Journal of Hydrology and Hydromechanics 58, no. 4 (2010): 245–60. http://dx.doi.org/10.2478/v10098-010-0023-z.

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Estimating Flow Characteristics of Different Weir Types and Optimum Dimensions of Downstream Receiving PoolThis paper presents the results of a laboratory study on the flow characteristics of sharp-crested weirs, broad-crested weirs, and labyrinth weirs. The variation of the maximum bubble penetration depth for different weir types is investigated depending on overfall jet expansion, discharge, and drop height. Moreover, most efficient depth, length and width of the downstream receiving pool in an open channel system are studied by considering the penetration depth, overfall jet expansion, jet

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4

Hussain, Ruqiya Abed, Sawsan Abdullah Hassan, and Asmaa Abdul Jabbar Jamel. "Experimental Study on Flow over Triangular Labyrinth Weirs." International Journal of Design & Nature and Ecodynamics 17, no. 2 (2022): 249–55. http://dx.doi.org/10.18280/ijdne.170211.

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Recently, many research studies have focused on labyrinth weirs' hydraulic performance, especially as dependent on engineering features. In the current study, the hydraulic properties of flow over labyrinth triangular weirs models (from the upper perspective) with sharp crest have been experimentally studied and compare their efficiency with suppressed rectangular weirs (conventional weirs). Twelve fiberglass models are developed for this reason and tested in a 6m in length, 30cm in width, and 40cm height in laboratory flume, nine models were constructed for triangular labyrinth weirs and thre

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5

Yousif, Omed S. Q., Kawa Z. Abdulrahman, Wazira Qadir, Ahang S. Ali, and Moses Karakouzian. "Characteristics of Flow over Rectangular Labyrinth Weirs with Round Corners." Hydrology 8, no. 4 (2021): 158. http://dx.doi.org/10.3390/hydrology8040158.

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The hydraulic performance of round-cornered rectangular labyrinth weirs with varying weir heights and effective lengths has not been explored in the existing literature to the authors’ knowledge. The purpose of this experimental study was to see how the height and effective length of round-cornered rectangular labyrinth weirs affect their discharge efficiency. Nine flat-crested rectangular labyrinth weirs made of high-density polyethylene (HDPE) were tested in a rectangular flume under various discharges to fulfill the goals of this study. The discharge coefficients for the weirs were then cal

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6

Kılıç, Zeyneb. "Geometric and Hydraulic Properties of Arced Labyrinth Weirs." International Journal of Current Engineering and Technology 12, no. 02 (2022): 121–26. http://dx.doi.org/10.14741/ijcet/v.12.2.4.

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Weirs serve a critical role in dam safety. Numerous reservoirs' flood projections used in hydraulic design have risen in magnitude in recent years. As a result, many current spillways are no longer adequate since they do not fulfill current discharge capacity standards. Labyrinth weirs are frequently used to rehabilitate existing fixed width spillways. Weirs come in a variety of shapes and sizes, including labyrinth, linear, piano key, and more. Labyrinth weirs enhance the weir crest length for a given width, which increases the weir flow capacity. The majority of labyrinth weirs are designed

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7

A, Abo A. "Performance Against Cavity Index and Discharge Coefficient between Broad and Sharp Crested Weirs." Polytechnic Journal 12, no. 1 (2022): 103–7. http://dx.doi.org/10.25156/ptj.v12n1y2022.pp103-107.

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The purpose of this research is examining the performance of rectangular broad and sharp crested weirs in terms of cavity index and discharge coefficient. For this purpose, a computational fluid dynamics CFD code FLUENT is applied. Firstly, the code verified by applies on the experiments work of Hagre et al 1994 the results show excellent agreements between CFD and Hager et al 1994. Secondly the code applied on both broad and sharp crested weirs. The results demonstrate that broad crested weirs have a lower discharge coefficient than sharp crested weirs, implying that broad crested weirs have

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8

Rezazadeh, Shiva, Mohammad Manafpour, and Hamze Ebrahimnejadian. "Three-Dimensional Simulation of Flow Over Sharp-Crested Weirs Using Volume of Fluid Method." Journal of Applied Engineering Sciences 10, no. 1 (2020): 75–82. http://dx.doi.org/10.2478/jaes-2020-0012.

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AbstractIn sharp crested weirs, significant changes occur in the hydraulic characteristics of the flow past the weirs with different geometry. A detailed investigation and better understanding of hydraulic behavior will help practically to choose an appropriate geometry for weir. The purpose of this research is simulate the flow over sharp crested weir and investigate the effect of geometric shapes of sharp crested weirs on hydraulic characteristics of the flow such as pressure, velocity, water level profiles and discharge coefficients. Thus the limitation and usage range of sharp crested weir

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9

Emiroglu, M. Emin, and Ahmet Baylar. "Experimental Study of the Influence of Different Weir Types on the Rate of Air Entrainment." Water Quality Research Journal 38, no. 4 (2003): 769–83. http://dx.doi.org/10.2166/wqrj.2003.048.

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Abstract Aeration is used in water treatment to alter the concentration of dissolved gases, to strip volatile organics, and to reduce tastes and odours. This can be obtained by creating turbulence in the water. One method of producing such turbulence is via the overflow jets downstream of weir structures. This paper investigates the effect of varying weir types on the air entrainment rate. Empirical correlations predicting the maximum penetration depth and air entrainment rate were developed for different weir types. It is demonstrated that the air entrainment rate of the broad-crested weirs i

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10

Tian, Zhong, Wei Wang, Ruidi Bai, and Nan Li. "Effect of Flaring Gate Piers on Discharge Coefficient for Finite Crest-Length Weirs." Water 10, no. 10 (2018): 1349. http://dx.doi.org/10.3390/w10101349.

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The use of flaring gate piers (FGPs) along with finite crest-length weirs changes the shape of plunging jets and increases the efficiency of energy dissipation in some projects; however, the FGPs may affect the discharge capacity. In this study, the flow pattern and discharge coefficient were experimentally investigated under different conditions by varying the weir lengths Lw, contraction ratio β, contraction angle θ, and water heads H. A comparative analysis of the weirs with and without FGPs was performed. For the finite crest-length weirs with FGPs, the water-surface profiles in the flow c

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11

Moldovan, Aurelian Cosmin, Valer Micle, Tomi Alexandrel Hrăniciuc, and Nicolae Marcoie. "Research on the Sustainable Development of the Bistrita Ardeleana River through the Resizing of Weirs." Water 14, no. 20 (2022): 3333. http://dx.doi.org/10.3390/w14203333.

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The layout of water resources and the complex and rational use of them have an important role in the socioeconomic activities of an urban settlement. Transversal hydrotechnical constructions such as weirs reduce the longitudinal connectivity of rivers and streams, affecting river biodiversity as well as water quality. This paper presents an alternative method that will help restore connectivity. In order to choose the best solution, topographical measurements were taken with a total topographical station, and a professional drone was used to obtain an updated orthophoto plan. After processing

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12

Neimanis, A. S., H. N. Koopman, A. J. Westgate, L. D. Murison, and A. J. Read. "Entrapment of harbour porpoises (Phocoena phocoena) in herring weirs in the Bay of Fundy, Canada." J. Cetacean Res. Manage. 6, no. 1 (2023): 7–17. http://dx.doi.org/10.47536/jcrm.v6i1.784.

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Harbour porpoises (Phocoena phocoena) are small coastal cetaceans vulnerable to mortality in fishing operations. Not all interactions are fatal, however, and each year many porpoises swim into and are subsequently released from herring weirs in the Bay of Fundy, Canada through a targeted release programme. This study examines catch composition, body condition, characteristics associated with mortality and factors affecting entrapment of porpoises in weirs between 1992-2001. A total of 886 porpoises were recorded in weirs during this period. A total of 657 animals were involved in attempted rel

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13

R. Eslinger, Kam, and Brian M. Crookston. "Energy Dissipation of Type a Piano Key Weirs." Water 12, no. 5 (2020): 1253. http://dx.doi.org/10.3390/w12051253.

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A Piano Key weir (PK weir) is a nonlinear, labyrinth-type weir well suited for rehabilitation projects due to a relatively small footprint and the ability to pass large discharges for lesser upstream-head values when compared with other weir types. A critical component of a hydraulic structure is the energy-dissipative properties. Currently, information and guidance is limited, with previous energy dissipation studies of PK weirs primarily of specific projects. Therefore, to document and quantify energy dissipation, four laboratory-scale Type A PK weir models with different width ratios (Wi/Wo

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14

Mohammed, Rangeen Shihab, and Shaker Abdulatif Jalil. "Hydraulic Performance of Sharp-Crested Labyrinth Weir." Academic Journal of Nawroz University 11, no. 1 (2022): 47–56. http://dx.doi.org/10.25007/ajnu.v11n1a1025.

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Weirs are used as a control structure in the waterways. Among the influencing geometrical parameters on the weir performance is the total crest length. Experimental work on 27 geometric models of two-cycle Labyrinth shape crest weir is tested. The tested physical models consist of three weir heights, three apex widths and the sidewall angle is between (4.67°≤ α ≤ 19°), with three models of rectangular labyrinth weirs. The weirs of the wider apex and the same total length perform better and its coefficient of discharge is higher. Labyrinth weirs of longer sidewall length and contents same apex

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15

Alizadeh Sanami, Forough, Amir Ghaderi, Fardin Alizadeh Sanami, Parisa Mirkhorli, and Silvia Di Francesco. "Laboratory Study of the Hydraulic Performance of the A-Type Triangular Piano Key Weir." Water 15, no. 11 (2023): 2124. http://dx.doi.org/10.3390/w15112124.

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A piano key weir (PKW), a new type of weir aiming to increase the discharge capacity of an existing dam, was recently designed. Despite a large body of research in this field, only a few studies were conducted on A-type triangular piano key weirs (TPKW) in straight channels. In this context, this present research sought to study the flow regime, stage–discharge relationship, and discharge coefficient. Experiments were carried out using nine TPKW models and three linear weirs (LW) as the control weirs. The results indicated that the triangular piano key weirs are capable of passing a higher dis

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16

Baylar, Ahmet, Tamer Bagatur, and Ahmet Tuna. "Aeration Performance of Triangular Notch Weirs at Recirculating System." Water Quality Research Journal 36, no. 1 (2001): 121–32. http://dx.doi.org/10.2166/wqrj.2001.008.

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Abstract An adequate supply of dissolved oxygen is essential for the survival of aquatic organisms. Hydraulic structures can increase dissolved oxygen levels by creating turbulent conditions, where small air bubbles are carried into the bulk of the flow. Plunging overfall jets from weirs at recirculating systems are a particular instance of this. This paper seeks triangular notch weirs having different weir angle (α) and how they affect the aeration performance. It is demonstrated that the aeration efficiency of a 90° triangular notch weir is generally better than that of the other weirs.

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17

Rdhaiwi, Ali Qasim, Ali Khoshfetrat, and Amirhossein Fathi. "EXPERIMENTAL COMPARISON OF FLOW ENERGY LOSS IN TYPE-B AND -C TRAPEZOIDAL PIANO KEY WEIRS (PKWS)." Journal of Engineering and Sustainable Development 28, no. 1 (2024): 55–63. http://dx.doi.org/10.31272/jeasd.28.1.4.

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As non-linear weirs with a high flow rate, Piano Key Weirs (PKWs) have attracted the attention of water engineers in recent years. Given the limited information available on the energy losses of these weirs, it is important to investigate the energy losses and discharge capacity of these weirs. In this research, two trapezoidal PKWs, i.e., type-B and -C, with a height of 0.2 m were used. The studied flow rates were 0.025, 0.03, 0.035, and 0.04 m3/s. The results showed that energy loss decreased by increasing the flow velocity and upstream depth. The average energy loss in the type-B trapezoida

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18

Roushangar, Kiyoumars, Mohammad Taghi Alami, Jalal Shiri, and Mahdi Majedi Asl. "Determining discharge coefficient of labyrinth and arced labyrinth weirs using support vector machine." Hydrology Research 49, no. 3 (2017): 924–38. http://dx.doi.org/10.2166/nh.2017.214.

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Abstract A labyrinth weir is a linear weir folded in plan-view which increases the crest length and the flow rate for a given channel width and an upstream flow depth. The present study aimed at determining discharge coefficients of labyrinth and arced labyrinth weirs using support vector machine (SVM)-based models. A total of 527 laboratory test data of four types of weirs, namely, Normal and Inverted orientation Labyrinth Weirs in flume (NLW, ILW) and Arced Labyrinth Weirs with and without nappe Breakers in reservoir (ALW, ALWB), were captured from the published literature and utilized to fe

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19

Namaee, Mohammad Reza, Mohammad Sadegh Jalaledini, Mahdi Habibi, Saeed Reza Sabbagh Yazdi, and Mona Ghafouri Azar. "Discharge coefficient of a broad crested side weir in an earthen channel." Water Supply 13, no. 1 (2013): 166–77. http://dx.doi.org/10.2166/ws.2012.081.

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Side weirs are widely used to divert flows from rivers and channels. However, the hydraulic behavior of this type of weir is complex and difficult to predict accurately. Previous studies on side weirs have generally focused on side weirs in rectangular channels with a smooth bed. However, one of the applications of side weirs is in irrigation systems which have trapezoidal cross sections and significant bed roughness. The present study investigates the hydraulic behavior of a broad crested side weir in an earthen channel with a rough bed under subcritical flow. These investigations showed that

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20

Pařílková, Jana, Jaromír Říha, and Zbyněk Zachoval. "The Influence of Roughness on the Discharge Coefficient of a Broad-Crested Weir." Journal of Hydrology and Hydromechanics 60, no. 2 (2012): 101–14. http://dx.doi.org/10.2478/v10098-012-0009-0.

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The Influence of Roughness on the Discharge Coefficient of a Broad-Crested Weir The use of environmentally-friendly materials in hydraulic engineering (e.g. the stone lining of weirs at levees) calls for the more accurate estimation of the discharge coefficient for broad-crested weirs with a rough crest surface. However, in the available literature sources the discharge coefficient of broad-crested weirs is usually expressed for a smooth crest. The authors of this paper have summarized the theoretical knowledge related to the effect of weir crest surface roughness on the discharge coefficient.

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21

Qasim Rdhaiwi, Ali, Ali Khoshfetrat, and Amirhossein Fathi. "EXPERIMENTAL INVESTIGATION OF SCOUR DOWNSTREAM OF A C-TYPE TRAPEZOIDAL PIANO KEY WEIR WITH STILLING BASIN." Journal of Engineering and Sustainable Development 27, no. 6 (2023): 688–97. http://dx.doi.org/10.31272/jeasd.27.6.2.

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In recent years, engineers have focused on finding a solution to reduce scouring downstream of piano key weirs. Piano key weirs have high efficiency in flood flow and a higher discharge coefficient. In this research, a type C trapezoidal piano key weir with a type 1 stilling basin was used. Three discharges and three water depths were also used. The results showed that the existence of the stilling basin reduces scour. In the weir with the stilling basin, the maximum scour depth is reduced and the scouring hole becomes more elongated. The maximum distance of the scouring depth increases compar

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22

Hussain, Rukaia A., and Sahar A. Mohammed. "Discharge Coefficient for Cylindrical Weirs." Tikrit Journal of Engineering Sciences 13, no. 1 (2006): 82–96. http://dx.doi.org/10.25130/tjes.13.1.05.

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The hydraulic characteristics of cylindrical weirs under free flow conditions were studied experimentally in order to investigate the discharge coefficient (Cd) and the influence of some significant factors and performance of weirs for discharge measuring. The experimental tests were carried out on three models of weirs in which the diameter of weir (D) was varied three times as: 8.0, 10.0 and 12.0 cm. For each model, a series of measurements were taken to measure coefficients of discharge. Results showed that the coefficient of discharge (Cd) increase with increasing the ratio of head to weir

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23

Gunjalli, Gowthami, Aishwarya S, Muthu D, Venkata Subramaniam C, and Ramakrishnan K. "Perforated Weir for Effective Operation – A Study." International Journal of Engineering & Technology 7, no. 3.12 (2018): 285. http://dx.doi.org/10.14419/ijet.v7i3.12.16043.

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The excess water during monsoon season in the river is retained using low dams and it overflows through weirs. Maintaining the water depth at the required level and increasing the discharge from the weir are the current problems facing now a days. To overcome these problems, a novel sharp crested perforated weir has been developed in this work with different shapes of perforations viz. circle, rectangle, square and triangle having same area of perforation. A total of 24 models were made with single, double, triple opening for each shape, under two different sets of area of openings. The models

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24

Baylar, Ahmet, and M. Emin Emiroglu. "The effect of sharp-crested weir shape on air entrainment." Canadian Journal of Civil Engineering 29, no. 3 (2002): 375–83. http://dx.doi.org/10.1139/l02-017.

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Aeration in the waters of rivers and streams is very important to the quality and existence of aquatic life. If the overfall jets downstream of weir structures plunges into a plunge pool, entrained air bubbles will contribute to aeration. This paper investigates sharp-crested weirs having different cross-sectional geometry and their effect on the air entrainment rate. It is demonstrated that the air entrainment rate of a 30° triangular sharp-crested weir is better than that of the other sharp-crested weirs tested. Moreover, variation in the number of V-notches over the width of the weir plate

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25

Bhukya, Raj Kumar, Manish Pandey, Manousos Valyrakis, and Panagiotis Michalis. "Discharge Estimation over Piano Key Weirs: A Review of Recent Developments." Water 14, no. 19 (2022): 3029. http://dx.doi.org/10.3390/w14193029.

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The piano key (PK) weir has advanced over the labyrinth weir to increase the discharge capacity. Piano key weirs exhibit nonlinear flow behavior and are easy to place on the existing spillway or newly constructed dam with less base area. Various investigators are given equations to calculate the discharge coefficient for free and submerged flow conditions. The study focuses on reviewing the impacts of the PK weir geometry on the weir flow discharge coefficient, including weir length and height, upstream and downstream key widths, and apex overhangs. In this study, all possible aspects of PK we

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26

Guan, Dawei, Jingang Liu, Yee-Meng Chiew, and Yingzheng Zhou. "Scour Evolution Downstream of Submerged Weirs in Clear Water Scour Conditions." Water 11, no. 9 (2019): 1746. http://dx.doi.org/10.3390/w11091746.

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Although weirs or dikes in the riverine and coastal environments are frequently overtopped, few studies have hitherto examined the evolution of the scour process downstream of these structures under the submerged condition. This paper presents an experimental investigation on time evolution of the scour process downstream of submerged weirs with a uniform coarse sand. The clear-water scour experiments were carried out in a tilting recirculation flume. Different flow intensities and overtopping ratios (approach flow depth/weir height) were adopted in the experiments. Experimental observations s

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27

Bijankhan, Mohammad, and Vito Ferro. "Dimensional analysis and stage-discharge relationship for weirs: a review." Journal of Agricultural Engineering 48, no. 1 (2017): 1–11. http://dx.doi.org/10.4081/jae.2017.575.

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Deducing the weir flow stage-discharge relationship is a classical hydraulic problem. In this regard Buckingham’s theorem of dimensional analysis can be used to find simple and accurate formulas to obtain the rating curves of different weir types. At first, in this review paper the rectangular weir that is a very common hydraulic structure is studied. It is indicated that the crest shape, approach channel width, obliquity (angle between the weir crest and the direction normal to the flow motion) and vertical inclination (pivot weir) are the key-parameters affecting the flow over the rectangula

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28

Bettez, J., R. D. Townsend, and A. Comeau. "Scale model testing and calibration of City of Ottawa sewer weirs." Canadian Journal of Civil Engineering 28, no. 4 (2001): 627–39. http://dx.doi.org/10.1139/l01-024.

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This paper reports the results of a laboratory study of the effects of (i) manhole proximity to installation site, (ii) pipe slope (i.e., approach velocity), (iii) upstream head measurement location, and (iv) submergence on the "hydraulics" of two types of sewer weirs used by the City of Ottawa. The City's streamlined form of broad-crested weir and its compound-shaped sharp-crested weir were initially calibrated for a "pipe straight"-arrangement (no upstream manhole is present) for a wide range of flow conditions at 0.2%, 0.4%, and 1.0% pipe slopes. The calibration tests were then repeated wit

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29

Kipnusu, Evagzard Korir, Charles Mwithali M´Erimba, and John Gichimu Mbaka. "Impact of Weirs on Decomposition Rates of Dombeya goetzenii (K. Schum) Leaf Litter in the River Njoro, Kenya." African Journal of Pure and Applied Sciences 4, no. 3 (2023): 1–11. http://dx.doi.org/10.33886/ajpas.v4i3.424.

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Water storage impoundments have deleterious effects on the structure and functioning of running water ecosystems. Many studies have been undertaken on the impacts of large impoundments on river ecosystems. However, comparatively few researches have determined the impact of small weirs on the functioning and structure of running water ecosystems. The main objective of the current study was to determine the impact of weirs on the decomposition rates of Dombeya goetzenii leaf litter in the Njoro River. The study was undertaken at five study sites located along the middle reaches of the Njoro Rive

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30

Rajaratnam, N., C. Katopodis, and M. A. Fairbairn. "Hydraulics of culvert fishways V: Alberta fish weirs and baffles." Canadian Journal of Civil Engineering 17, no. 6 (1990): 1015–21. http://dx.doi.org/10.1139/l90-112.

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This paper presents the results of a laboratory study of the hydraulic performance of fish weirs and fish baffles used by Alberta Transportation for improving the fish-passing capacity of culverts. It was found that if the longitudinal spacing of the weirs is limited to 0.6 and 1.2 times the diameter of the culvert, their performance is comparable to that of the corresponding weir and slotted-weir baffle systems, with regard to the depth of pool between the baffles as well as the barrier velocity. On the other hand, the fish baffles did not perform as well as the fish weirs under the condition

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31

Al Babely, Emad Abdul-Gabbar, Adnan Abdul-Wahab Al Muhammad, and Mohammad A. Al Dabbagh. "Overflow Characteristic of Cylindrical Shape Crest Weirs over Horizontal Bed." Tikrit Journal of Engineering Sciences 18, no. 4 (2011): 29–39. http://dx.doi.org/10.25130/tjes.18.4.04.

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The most common types of weirs are the broad-crested weir, the sharp-crested weir, the circular crested weir and the ogee crested weir. Advantages of the cylindrical weir shape include the stable overflow pattern, the ease to pass floating debris, the simplicity of design compared to ogee crest design and the associated lower costs. In present study, it was investigated the overflow characteristics of circular weirs in laboratory for various cylinder radii of three sizes (11.4, 9.0, 6.3 cm), and the models fixed on the channel bed vertically to the direction of flow. The result shows that the

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32

Pirzad, M., M. H. Pourmohammadi, H. Ghorbanizadeh Kharazi, M. Solimani Babarsad, and E. Derikvand. "Experimental study on flow over arced-plan porous weirs." Water Supply 22, no. 3 (2021): 2659–72. http://dx.doi.org/10.2166/ws.2021.446.

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Abstract Unlike conventional impermeable weirs, porous weirs do not clog the flow and passage of aquatic life with increased aeration or aerobic reactions. They have minimal negative effects on the environment and are known as environmentally friendly structures. This study experimentally investigates the hydraulic performance of arced-plan porous weirs (APPWs) in different hydraulic and geometric conditions. For this purpose, four different porous and two solid weirs were examined. Experiments were conducted in a horizontal laboratory flume with length, width and height of 20, 0.6 and 0.5 m,

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33

Valentine, Elizabeth, Kurt Kronebusch, David Z. Zhu, et al. "Combined sewer overflow over an oblique weir at Rat Creek in Edmonton, Alberta." Canadian Journal of Civil Engineering 37, no. 3 (2010): 477–88. http://dx.doi.org/10.1139/l09-177.

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Oblique weirs are commonly used in urban drainage systems to remove excess flow from a sewer, in particular, a combined sewer system that has limited conveyance capacity. It is important to understand the hydraulics of these weirs to properly monitor the amount of the overflows as well as to design and improve sewer systems. The Rat Creek structure in Edmonton, Alberta, is a combined sewer overflow structure with a weir at an oblique alignment to the centerline of the sewer. A physical model study of the structure was conducted. The results show that both the approach flow conditions and the c

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Sanz-Ronda, Francisco Javier, Francisco Javier Bravo-Córdoba, Ana García-Vega, Jorge Valbuena-Castro, Andrés Martínez-de-Azagra, and Juan Francisco Fuentes-Pérez. "Fish Upstream Passage through Gauging Stations: Experiences with Iberian Barbel in Flat-V Weirs." Fishes 6, no. 4 (2021): 81. http://dx.doi.org/10.3390/fishes6040081.

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The monitoring of river discharge is vital for the correct management of water resources. Flat-V gauging weirs are facilities used worldwide for measuring discharge. These structures consist of a small weir with a triangular cross-section and a flat “V”-shaped notch. Their extensive use is a consequence of their utility in the measurement of both low and high flow conditions. However, depending on their size, local morphology and river discharge can act as full or partial hydraulic barriers to fish migration. To address this concern, the present work studies fish passage performance over flat-

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Wibowo, A. R., M. Bisri, Sumiadi, and V. Dermawan. "Model of discharge coefficient of crest gate rubber weir at fully closed condition." IOP Conference Series: Earth and Environmental Science 930, no. 1 (2021): 012026. http://dx.doi.org/10.1088/1755-1315/930/1/012026.

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Abstract Crest Gate Rubber Weir is a modification of rubber weir with adding a metal plate or crest gate on the upstream side. The rubber in this weir functioning as a support while the crest gate serves on elevating water. Although many have been implemented, this weir’s discharge coefficient needs be researched considering its unique shape. This study looks for discharge coefficient to determine the discharge that passes through weirs at fully closed conditions. The research was conducted with a hydraulic model resembling part of Tirtonadi Weir in Surakarta with a hydraulic model. The model

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Kim, Young-Hyo, In-Hwan Cho, Ha-Kyung Kim, Eun-A. Hwang, Byung-Hun Han, and Baik-Ho Kim. "Assessing the Impact of Weirs on Water Quality and Phytoplankton Dynamics in the South Han River: A Two-Year Study." Water 16, no. 6 (2024): 833. http://dx.doi.org/10.3390/w16060833.

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This study investigates the ecological effects of weirs on water quality and phytoplankton communities in the South Han River (SHR) over a two-year period. By focusing on three key weirs—Kangcheon Weir, Yeoju Weir, and Ipo Weir—the research examines how artificial structures influence river hydrodynamics, nutrient cycles, and algal growth patterns. Utilizing water quality measurements, phytoplankton analysis, and environmental factor assessments, the study identifies significant fluctuations in water quality parameters and phytoplankton abundance across the surveyed points. The analysis reveal

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Hubble, T. C. T. "Slope stability analysis of potential bank failure as a result of toe erosion on weir-impounded lakes: an example from the Nepean River, New South Wales, Australia." Marine and Freshwater Research 55, no. 1 (2004): 57. http://dx.doi.org/10.1071/mf03003.

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The consequences of weirs present on the Upper Nepean River on the long-term slope stability of both vegetated and devegetated riverbanks were investigated using models that account for the reinforcement of bank sediments by tree roots. The effects of the weirs in concert with channel widening and deepening caused by dredging in 1970s and 1980s, as well as natural processes, have turned the Upper Nepean from a small upland river into a series of quiet, narrow lakes, measuring 3–5 m deep, 30–70 m wide and several kilometres long. The surface of these lakes is located currently within the steep

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Hadi, Zahraa Muslim, and Hayder Q. Majeed. "Simulation of the Entrance to the Escape of the Flood Branching from the Diyala River." Journal of Engineering 29, no. 08 (2023): 138–48. http://dx.doi.org/10.31026/j.eng.2023.08.10.

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The Diyala River is considered the third most important river in Iraq. However, in the recent period, Diyala Governorate has been subject to several floods. This study aims to simulate an efficient labyrinth weir at the flood escape entrance branching from the Diyala River to reach the best entrance through which the flood waves can pass safely. The discharge coefficient was calculated laboratory for five types of trapezoidal side labyrinth weirs with different sidewall angles. Results showed that the coefficient discharge for the trapezoidal labyrinth side weir with an angle of the sidewall i

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Ghadba, Edan I. "Hydraulic Characteristics of Semi- Circular Sharp Crested Weirs." Tikrit Journal of Engineering Sciences 18, no. 1 (2011): 58–68. http://dx.doi.org/10.25130/tjes.18.1.11.

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In this research the hydraulic characteristics of sharp crested weirs with semi- circular shape were studied, the study was depended on the dimensional analysis which confirmed by experimental work. The dimensional analysis results demonstrate that the effective parameters on the discharge of flow over this type of weir are the ratio of water height above the weir crest to the radius of this weir (H/R) and the ratio of water height above the weir crest to the height of the crest (H/P). Experimental tests were carried out on (16) models of weirs with Semi-circle shape where the radius of cuttin

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Lindermuth, Adrian, Théo St Pierre Ostrander, Stefan Achleitner, Bernhard Gems, and Markus Aufleger. "Discharge Calculation of Side Weirs with Several Weir Fields Considering the Undisturbed Normal Flow Depth in the Channel." Water 13, no. 13 (2021): 1717. http://dx.doi.org/10.3390/w13131717.

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Discharge behavior at side weirs is significantly influenced by the water surface profile along the weir crest. In the past century, different approaches were developed to describe this profile and the associated discharge coefficients. However, the application of these methods to practical problems poses a particular challenge, as a complex three-dimensional funnel is formed due to the discharge reduction, leading to significant uncertainties in determining the relevant flow depth. For this reason, a new approach for the determination of the discharge coefficient of side weirs was developed t

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Kabwe, Alex Lushikanda, Masahiro Hyodo, Hidehiko Ogata, Yoshihiro Sagawa, Yoshinao Adachi, and Masayuki Ishii. "The Factors Affecting Stability and Durability of Flow Diversion Simple Weirs in Muchinga Province of Zambia." Water 16, no. 13 (2024): 1852. http://dx.doi.org/10.3390/w16131852.

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The effectiveness of simple weirs and the ability of rural farmers to construct durable weirs are still areas of concern in rural areas in Zambia. The objective of this study is to investigate the factors contributing to the varying levels of durability of the simple weir structures used for the diversion of river flows. This study was conducted in five districts where 33 simple weirs located in similar geographical zones were analyzed for their longevity. The research delved into catchment and climatic variables, as well as the social and psychological perception of simple weirs. This study c

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Wang, Yue, Jihong Xia, Wangwei Cai, et al. "Response of Fish Habitat Quality to Weir Distribution Change in Mountainous River Based on the Two-Dimensional Habitat Suitability Model." Sustainability 15, no. 11 (2023): 8698. http://dx.doi.org/10.3390/su15118698.

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Weirs are often constructed on mountainous rivers because of their low construction costs and their ability to provide irrigation and facilitate landscaping, yet there is little research on how fish habitat quality in mountainous rivers responds to weir distribution. This study categorized the distribution characteristics of weirs on typical reaches according to their sinuosity and calculated the corresponding habitat suitability index (HSI) and weighted usable area (WUA) under various discharge conditions using a coupled MIKE21 and habitat suitability model. Then, the relationship between the

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Baylar, Ahmet. "An Investigation on the Use of Venturi Weirs as an Aerator." Water Quality Research Journal 38, no. 4 (2003): 753–67. http://dx.doi.org/10.2166/wqrj.2003.047.

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Abstract The most classic example of a hydraulic structure where gas transfer occurs is a weir. Transfer of gases between the atmosphere and river water can occur in a free overfall jet from a weir. A free overfall jet from a weir plunging into downstream water causes entrainment of air bubbles if the free overfall jet velocity exceeds the critical value where aeration occurs. This paper investigates the free overfall jets from Venturi and rectangular notch weirs and their effect on air entrainment rate. A Venturi weir was placed at the upstream channel end in order to increase the flow veloci

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Lakusic, Stjepan. "The effect of crest shape on discharge coefficient at linear weirs." Journal of the Croatian Association of Civil Engineers 75, no. 07 (2023): 695–702. http://dx.doi.org/10.14256/jce.2027.2017.

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A detailed experimental laboratory analysis of the effect of crest shape on the discharge coefficient of sharp-crested weirs is presented in the paper. The experiments were conducted for four different crest shapes. The experiments and analyses show that discharge capacity, and discharge coefficient in particular, are significantly affected by weir crest height. It is stated in conclusion that rounded crest shape has the highest discharge capacity. In practice, sharp crested weirs are generally preferred to other crest shapes due to construction facility, although the discharge coefficient val

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Azimi, Hamed, and Saeid Shabanlou. "Comparison of Subcritical and Supercritical Flow Patterns Within Triangular Channels Along the Side Weir." International Journal of Nonlinear Sciences and Numerical Simulation 17, no. 7-8 (2016): 361–68. http://dx.doi.org/10.1515/ijnsns-2015-0103.

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AbstractSide weirs with triangular channel are used as flow controlling devices in draining and irrigation networks. By installing a side weir on the main conduits side walls, the runoff overflows from the weir and are conducted toward the diversion channel. In this study, changing of the flow free surface and the turbulence of the flow field in triangular channels with side weir are numerically simulated using volume of fluid (VOF) scheme and RNG k–ε turbulence model. In the present paper, the pattern of the spatially varied flow with decreasing discharge in both subcritical and supercritical

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Uyumaz, A. "Flow Over Side Weirs in Rectangular and Circular Channels." Water Science and Technology 21, no. 8-9 (1989): 739–46. http://dx.doi.org/10.2166/wst.1989.0277.

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Flow over side weirs in rectangular and circular channels is discussed. Numerical models are obtained from energy principles and are solved by a finite difference method. The results are presented in diagrammatic form for practical use. It is shown that rectangular channel side weir procedures cannot be used for obtaining approximate water surface profiles along the side weirs in circular channels.

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Mehri, Yaser, Jaber Soltani, Mojtaba Saneie, and Mohhamad Rostami. "Discharge Coefficient of a C-Type Piano Key Side Weir at 30° and 120° Sections of a Curved Channel." Civil Engineering Journal 4, no. 7 (2018): 1702. http://dx.doi.org/10.28991/cej-03091106.

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A piano key side weir (PKSW) is a non-linear weir that discharge exceeds linear weirs by increasing the length in width. PKSW can be used in side weirs with space limitation. As side weirs are extensively used in flood control, water level control in rivers, and water supply channels, it is necessary to use PKSW as side weirs. This research discusses the discharge coefficient of a PKSW by assessing a C-type PKSW at 30° and 120° sections of a channel with a longitudinal curve. Dimensional analysis was used for identifying the parameters effective in the discharge coefficient. The effects of the

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El Hattab, Mohamad H., Ana Mijic, and Dejan Vernon. "Optimised Triangular Weir Design for Assessing the Full-Scale Performance of Green Infrastructure." Water 11, no. 4 (2019): 773. http://dx.doi.org/10.3390/w11040773.

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Conventional triangular weirs have been originally developed to measure, divert, and control surface water. However, a special application of these weirs, such as for low flow measurements in full-scale monitoring of Green Infrastructure (GI), is not well investigated. Available head-discharge relationships for triangular sharp-crested weirs are only valid under a free-flow regime. Literature focusing on the V-notch weir usage for GI assessment suggests that it is necessary to calibrate the head-discharge relationship before its use. This study focuses on understanding the effects of site cons

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Vanishree, B. Rao, and R. Manjula. "Analysis of various parameters affecting weir design and fabrication of Weirs: An Overview." MATEC Web of Conferences 144 (2018): 01006. http://dx.doi.org/10.1051/matecconf/201814401006.

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Several geometric parameters influence weir discharge and it is explained in our present study. The PK weir is more efficient than rectangular labyrinth weir due to reduction in entrance losses of PK weir inlet key geometry. PK weir is a type of labyrinth weir with variation in angle. Therefore, in this paper we also discuss about labyrinth weir. PKW are compatible for constructing on existing or new spillway with lesser space requirement and structural stability. PKW are installed in order to increase the discharge capacity for a given footprint area. PKW is used to increase the overflow capa

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Rood, Stewart B., and Amber Willcocks. "Duckling mortality at a river weir." Canadian Field-Naturalist 133, no. 2 (2019): 167. http://dx.doi.org/10.22621/cfn.v133i2.2159.

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River weirs are low-head dams that dissipate energy by creating hydraulic recirculation zones at their base. These recirculation zones are a major cause of human drownings and have been referred to as “drowning machines”. We observed an event that allowed us to add ducklings to the list of weir victims. As a Mallard (Anas platyrhynchos) hen and her brood floated over the Calgary weir, the mother flew safely over the hydraulic recirculation. The ducklings drifted into the recirculation and three quickly passed through; four were stalled, repeatedly recirculated, and died. We observed other regi

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