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Journal articles on the topic 'TRIANGULAR LABYRINTH WEIR'

Author: Grafiati

Published: 11 September 2023

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1

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 (April 27, 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 three models were constructed for suppressed rectangular weirs, Three alternative heights (p=15, 20, and 25cm) were employed in this research, for each height, the vertex angle (θ) changed three times (60օ, 90օ, 120օ), and for each one of these weirs was used, seven different discharge were approved. The overall tests in this study were 84. The dimensionless parameters on which the discharge coefficient (Cd) is dependent were obtained using dimensional analysis. parameters were plotted. According to this experimental present study, as compared to linear weirs, labyrinth triangular weirs shown to be more hydraulically efficient. Also, the height of the weir (P) has effects on the discharge coefficient, where (Cd) increased with decreasing (P). Also, the vertex angle of triangular labyrinth weirs(θ) has a major influence on discharge coefficient and on weir performance, where the discharge coefficient raises when decreases the value of angle(θ), in another means, when the angle decreases gave an increase in the path of the flow, where it gave the triangular labyrinth weir with an angle of 60o the discharge coefficient reached its greatest value (2.55), followed by the weir with an angle of 90o and 120o respectively. In other words (a small vertex angle gives more length effective (Le) to the weir) and this leads to an increase in flow capacity or performance for the weir.

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2

Aurahman, Tara H., Jehan M. Fattah Sheikh Suleimany, and Taban K. Hamad. "Determination of Discharge Coefficient for both Semicircular and Triangular Labyrinth Weirs." Polytechnic Journal 11, no. 2 (December 30, 2021): 56–64. http://dx.doi.org/10.25156/ptj.v11n2y2021.pp56-64.

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A Labyrinth weir is a type of nonlinear weir folded in plan-view, with the ability to pass a large flow at low heads due to an increase in the effective length of the weir crest for a given channel width. The discharge coefficients (Cd) were experimentally determined for both semicircular and triangular labyrinth weirs of varying sidewall angles (α) under free-flow conditions using eight physical models. Dimensional analyses are conducted using the Buckingham π theorem to find the dependent and non-dependent variables. A nonlinear empirical equation was developed using (Statistical Package for the Social Sciences 22) software. The findings show that the discharge coefficient decreases with the increase of headwater to (Ht/P) for both types of labyrinth weir with different plan forms. It is found that the efficiency of the semicircular and triangular labyrinth is higher than linear weir for (Ht/P ≤ 0.45) and decreases with increasing the value of (Ht/P) due to interference of flow between the layers in downstream. The obtained results revealed that the discharge coefficient (Cd) values obtained empirically using multivariable power regression and 5th degree polynomial equations considerably agree with the experimental data, for both of the semicircular and triangular labyrinth weirs. Furthermore, the correlation coefficient R2was (0.9951) and (0.9637) using 5th degree polynomial equation, and their values were (0.9643) and (0.9274) using multivariable power regression equation for both semicircular and triangular labyrinth weir models, respectively. The results in the present study compared quite well with the predicted results of the proposed equations obtained by other investigators.

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3

Abbasi, Saeed, Sajjad Fatemi, Amir Ghaderi, and Silvia Di Francesco. "The Effect of Geometric Parameters of the Antivortex on a Triangular Labyrinth Side Weir." Water 13, no. 1 (December 24, 2020): 14. http://dx.doi.org/10.3390/w13010014.

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Side weirs are important structural measures extensively used, for instance, for regulating water levels in rivers and canals. If the length of the opening is limited, the amount of water diverted out of the channel and the effective length can be increased by applying a labyrinth side weir. The present study deals with numerical simulations regarding the hydraulic performance of a labyrinth side weir with a triangular plan in single-cycle mode. Specifically, six different types of antivortexes embedded inside it and in various hydraulic conditions at different Froude numbers are analyzed. The antivortexes are studied using two groups, permeable and impermeable, with three different heights: 0.5 P, 0.75 P, and 1 P (P: Weir height). The comparison of the simulated water surface profiles with laboratory results shows that the numerical model is able to capture the flow characteristics on the labyrinth side weir. The use of an antivortex in a triangular labyrinth side weir reduces the secondary flows due to the interaction with the transverse vortexes of the vertical axis and increases the discharge capacity by 11%. Antivortexes in a permeable state outperform those in an impermeable state; the discharge coefficient in the permeable state increases up to 3% with respect to the impermeable state. Finally, based on an examination of the best type of antivortex, taking into account shape, permeability, and height, the discharge coefficient increases to 13.4% compared to a conventional labyrinth side weir.

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4

Ghaderi, Amir, Rasoul Daneshfaraz, Mehdi Dasineh, and Silvia Di Francesco. "Energy Dissipation and Hydraulics of Flow over Trapezoidal–Triangular Labyrinth Weirs." Water 12, no. 7 (July 14, 2020): 1992. http://dx.doi.org/10.3390/w12071992.

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In this work experimental and numerical investigations were carried out to study the influence of the geometric parameters of trapezoidal–triangular labyrinth weirs (TTLW) on the discharge coefficient, energy dissipation, and downstream flow regime, considering two different orientations in labyrinth weir position respective to the reservoir discharge channel. To simulate the free flow surface, the volume of fluid (VOF) method, and the Renormalization Group (RNG) k-ε model turbulence were adopted in the FLOW-3D software. The flow over the labyrinth weir (in both orientations) is simulated as a steady-state flow, and the discharge coefficient is validated with experimental data. The results highlighted that the numerical model shows proper coordination with experimental results and also the discharge coefficient decreases by decreasing the sidewall angle due to the collision of the falling jets for the high value of H/P (H: the hydraulic head, P: the weir height). Hydraulics of flow over TTLW has free flow conditions in low discharge and submerged flow conditions in high discharge. TTLW approximately dissipates the maximum amount of energy due to the collision of nappes in the upstream apexes and to the circulating flow in the pool generated behind the nappes; moreover, an increase in sidewall angle and weir height leads to reduced energy. The energy dissipation of TTLW is largest compared to vertical drop and has the least possible value of residual energy as flow increases.

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5

Rustiati, N. B., M. G. Ishak, A. Tanga, and Z. G. Pali. "Influence of The Number of Trapezoidal Labyrinth Weir Cycles on The Hydraulic Characteristics of The Weir." IOP Conference Series: Earth and Environmental Science 1157, no. 1 (April 1, 2023): 012051. http://dx.doi.org/10.1088/1755-1315/1157/1/012051.

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Abstract The labyrinth weir that is viewed from above has a zig-zag shape. The main objective is to extend the spillway so that the water level upstream of the weir is as low as possible or to increase the discharge capacity. The shapes of labyrinth weirs based upon cycle shape are triangular, trapezoidal, and rectangular. However, besides the shape of the spillway, several parameters affect its hydraulic characteristics. Therefore, this paper intends to explore the effect of the number of cycles on the trapezoidal labyrinth weir on the hydraulic characteristics of the weir, based on an experimental study. There are two types of model tests one-cycle and two-cycle. Both of the models have a 2300 mm length of the spillway and were made of fiber cement board with a thickness of 20 mm and tested in a rectangular flume of 950 mm width, under various discharges to fulfill the goals of this study. The results of this study show that the discharge capacity through a one-cycle model (0.0064m3/s to 0.0150 m3/s) has a larger capacity than that of a two-cycle model (0.0023m3/s to 0.0095 m3/s). Analyzing can determine that the most efficient hydraulically are the less cycle number of labyrinth weir.

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6

Karimi, Sohrab, Hossein Bonakdari, and Azadeh Gholami. "Determination Discharge Capacity of Triangular Labyrinth Side Weir Using Multi-Layer Neural Network (ANN-MLP)." Current World Environment 10, Special-Issue1 (June 28, 2015): 111–19. http://dx.doi.org/10.12944/cwe.10.special-issue1.16.

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statistic indexes have been used to assess the accuracy of the results. The results of the examinations indicate that using MLP model along with simultaneous use of dimensionless parameters for the purposes of estimating discharge coefficient: the ratio of water behind the weir to the channel width (h/b), ratio of weir crest length to weir height (L/W), relative Froude number (F=V/√(2Side weirs are used in open channels to control flood and the flow passing through it. Discharge capacity is one of the crucial hydraulic parameters of side weirs. The aim of this study is to determine the effect of the intended dimensionless parameters on predicting the discharge coefficient of triangular labyrinth side weir. MAPE, RMSE, and Rgy)) and vertex angle (ϴ), offered the best results (MAPE= 0.67, R2= 0.99, RMSE = 0.009) in comparison with other models.

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7

Li, Shicheng, James Yang, and Anders Ansell. "Evaluation of Pool-Type Fish Passage with Labyrinth Weirs." Sustainability 14, no. 3 (January 18, 2022): 1098. http://dx.doi.org/10.3390/su14031098.

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Due to the construction of dams and sluices, habitat fragmentation of riverine species is an issue of concern in hydropower projects. An artificial fishway aims to restore flow connectivity and facilitate migration. As an alternative to the conventional layout with straight walls, labyrinth layouts are introduced, consisting of either triangular, trapezoidal, or rectangular weirs. Three-dimensional CFD simulations are performed to examine their influences on the fishway hydraulics. The labyrinth layouts exhibit an appreciable three-dimensional flow structure in a pool, featuring flow fluctuations in both cross- and along-channel directions, which is indicative of the potential for multiple species with distinct swimming preferences. The streamwise reduction in mean flow velocity is correlated with the Froude number, with the labyrinth weirs leading to a somewhat lower reduction than the conventional one. The dimensionless pool water depth declines with specific flow discharge. The turbulence kinetic energy is the lowest in the triangular layout and the vorticity in the conventional one. Among the labyrinth layouts, the differences in volumetric power dissipation are small. An equation is developed for dissipation estimation. All the labyrinth layouts generate higher energy loss than the conventional one. With optional weir configurations, the findings provide reference for engineering design.

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8

Seyedjavad, Minasadat, Seyed Taghi Omid Naeeni, and Mojtaba Saneie. "Laboratory Investigation on Discharge Coefficient of Trapezoidal Piano Key Side Weirs." Civil Engineering Journal 5, no. 6 (June 23, 2019): 1327–40. http://dx.doi.org/10.28991/cej-2019-03091335.

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A spillway is a hydraulic structure used to provide the controlled release of surplus waters and floods from a dam into a downstream area. A side weir is a multipurpose hydraulic structure which is constructed in water conveyance systems with a height lower than that of the canal wall. When the water surface level goes up, the side weir regulates the discharge and controls the water surface in the main canal. Besides, the side weir controls and diverts floods in dam reservoirs, diverts the flow and protects the structure against the river inundations. In this research, a laboratory investigation is performed with 16 Type-A piano key weirs and three different pier heights of 10, 15 and 20cm. These weirs are studied for two cases of 1 and 2. The results show that the weirs with 15cm and 20cm heights in both cases 1 and 2 have the highest discharge coefficient in dimensionless ratios of 0.2> H/P> 0.4 and H/P>0.5 respectively. Having reviewed previous studies, it could be concluded that the trapezoidal piano key side weir is capable of releasing a flow 1.2 times more than that of the linear trapezoidal labyrinth weir with 12 degrees angle and 1.87 times more than the one with 6 degrees angle, and 1.5 times more than that of the triangular labyrinth weir.

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9

Carollo, Francesco Giuseppe, Vito Ferro, and Vincenzo Pampalone. "Testing the Outflow Process over a Triangular Labyrinth Weir." Journal of Irrigation and Drainage Engineering 143, no. 8 (August 2017): 06017007. http://dx.doi.org/10.1061/(asce)ir.1943-4774.0001198.

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10

Bijankhan, Mohammad, and Vito Ferro. "Dimensional analysis and stage-discharge relationship for weirs: a review." Journal of Agricultural Engineering 48, no. 1 (February 17, 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 rectangular weirs. The flow over the triangular, labyrinth, parabolic, circular, elliptical, and W-weirs are also studied using dimensional analysis and incomplete self-similarity concept. For all mentioned weirs the stage-discharge relationships are presented and the application limits are discussed. The results of this paper can be used and implemented by the irrigation and drainage network designers to simplify the procedure of weir design.

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11

Dizabadi, Shahram, and Amir H. Azimi. "Hydraulic and turbulence structure of triangular labyrinth weir‐pool fishways." River Research and Applications 36, no. 2 (December 25, 2019): 280–95. http://dx.doi.org/10.1002/rra.3581.

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12

Carollo, Francesco Giuseppe, Vito Ferro, and Vincenzo Pampalone. "Experimental Investigation of the Outflow Process over a Triangular Labyrinth-Weir." Journal of Irrigation and Drainage Engineering 138, no. 1 (January 2012): 73–79. http://dx.doi.org/10.1061/(asce)ir.1943-4774.0000366.

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13

Aydin, M. Cihan. "CFD simulation of free-surface flow over triangular labyrinth side weir." Advances in Engineering Software 45, no. 1 (March 2012): 159–66. http://dx.doi.org/10.1016/j.advengsoft.2011.09.006.

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14

Ziaei, Ali Naghi, Neda S. R. Nikou, Ali Beyhaghi, Fatemeh Attarzadeh, and Saeed Reza Khodashenas. "Flow simulation over a triangular labyrinth side weir in a rectangular channel." Progress in Computational Fluid Dynamics, An International Journal 19, no. 1 (2019): 22. http://dx.doi.org/10.1504/pcfd.2019.097599.

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15

Khodashenas, Saeed Reza, Fatemeh Attarzadeh, Ali Beyhaghi, Ali Naghi Ziaei, and Neda S. R. Nikou. "Flow simulation over a triangular labyrinth side weir in a rectangular channel." Progress in Computational Fluid Dynamics, An International Journal 19, no. 1 (2019): 22. http://dx.doi.org/10.1504/pcfd.2019.10018823.

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16

Wang, Fei, Shengyi Zheng, Yiming Ren, Weidong Liu, and Chao Wu. "Application of hybrid neural network in discharge coefficient prediction of triangular labyrinth weir." Flow Measurement and Instrumentation 83 (March 2022): 102108. http://dx.doi.org/10.1016/j.flowmeasinst.2021.102108.

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17

Seyedian, Seyed Morteza, AmirHamzeh Haghiabi, and Abbas Parsaie. "Reliable prediction of the discharge coefficient of triangular labyrinth weir based on soft computing techniques." Flow Measurement and Instrumentation 92 (August 2023): 102403. http://dx.doi.org/10.1016/j.flowmeasinst.2023.102403.

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18

Zounemat-Kermani, Mohammad, Soudabeh Golestani Kermani, Minoo Kiyaninejad, and Ozgur Kisi. "Evaluating the application of data-driven intelligent methods to estimate discharge over triangular arced labyrinth weir." Flow Measurement and Instrumentation 68 (August 2019): 101573. http://dx.doi.org/10.1016/j.flowmeasinst.2019.101573.

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19

Emiroglu, M. Emin, Omer Bilhan, and Ozgur Kisi. "Neural networks for estimation of discharge capacity of triangular labyrinth side-weir located on a straight channel." Expert Systems with Applications 38, no. 1 (January 2011): 867–74. http://dx.doi.org/10.1016/j.eswa.2010.07.058.

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20

Karami, Hojat, Sohrab Karimi, Hossein Bonakdari, and Shahabodin Shamshirband. "Predicting discharge coefficient of triangular labyrinth weir using extreme learning machine, artificial neural network and genetic programming." Neural Computing and Applications 29, no. 11 (October 4, 2016): 983–89. http://dx.doi.org/10.1007/s00521-016-2588-x.

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21

Bilhan, Omer, M. Emin Emiroglu, and Ozgur Kisi. "Use of artificial neural networks for prediction of discharge coefficient of triangular labyrinth side weir in curved channels." Advances in Engineering Software 42, no. 4 (April 2011): 208–14. http://dx.doi.org/10.1016/j.advengsoft.2011.02.006.

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22

Emin Emiroglu, M., Ozgur Kisi, and Omer Bilhan. "Predicting discharge capacity of triangular labyrinth side weir located on a straight channel by using an adaptive neuro-fuzzy technique." Advances in Engineering Software 41, no. 2 (February 2010): 154–60. http://dx.doi.org/10.1016/j.advengsoft.2009.09.006.

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23

Karami, Hojat, Sohrab Karimi, Mohammad Rahmanimanesh, and Saeed Farzin. "Predicting discharge coefficient of triangular labyrinth weir using Support Vector Regression, Support Vector Regression-firefly, Response Surface Methodology and Principal Component Analysis." Flow Measurement and Instrumentation 55 (June 2017): 75–81. http://dx.doi.org/10.1016/j.flowmeasinst.2016.11.010.

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24

Tanga, Arody, Muh Galib Ishak, and Yassir Arafat. "EFFECT OF PLAN SHAPE ON HYDRAULIC CHARACTERISTICS OF LABYRINTH WEIRS." Jurnal Sains dan Teknologi Tadulako 9, no. 1 (April 20, 2023): 10–18. http://dx.doi.org/10.22487/jstt.v9i1.446.

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Labyrinth weirs have a longer crest length compared to linear weirs to increase the discharge capacity for a given water head. Generally, the plan shape of labyrinth weirs is triangular, trapezoidal, and rectangular. In this regard, several studies have been published regarding determining the hydraulic characteristics of labyrinth weirs. However, the effect of changing the plan shape if other parameters such as the same length and height have not been addressed in the current literature. To fill this gap, this study aims to compare the hydraulic characteristics of flow over triangular, trapezoidal, and rectangular labyrinth weirs with the same length of the crest i.e. 230 cm length. Experiments study were conducted in a flume with a length of 16 m and a width of 95 cm. Three experimental models in this study were used. The results of this study indicated that changing the plan shape from trapezoidal to triangular increased the discharge coefficient (Cd) by about 38,0% on average. Furthermore, changing rectangular to triangular increased the Cd by about 64,5% on average. Thus, it can be concluded that the triangular model was the most efficient hydraulically compared to the others while the rectangular model was the least efficient.

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25

Wormleaton, Peter R., and Ebrahim Soufiani. "Aeration Performance of Triangular Planform Labyrinth Weirs." Journal of Environmental Engineering 124, no. 8 (August 1998): 709–19. http://dx.doi.org/10.1061/(asce)0733-9372(1998)124:8(709).

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26

Elnikhely, Eman Aly, and Ismail Fathy. "Prediction of scour downstream of triangular labyrinth weirs." Alexandria Engineering Journal 59, no. 2 (April 2020): 1037–47. http://dx.doi.org/10.1016/j.aej.2020.03.025.

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27

Karimi, Mahmoud, Mohammadreza Jalili Ghazizadeh, Mojtaba Saneie, and Jalal Attari. "Flow characteristics over asymmetric triangular labyrinth side weirs." Flow Measurement and Instrumentation 68 (August 2019): 101574. http://dx.doi.org/10.1016/j.flowmeasinst.2019.101574.

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28

Borghei, S. Mahmood, Mohammad Ali Nekooie, Hadi Sadeghian, and Mohammad Reza Jalili Ghazizadeh. "Triangular labyrinth side weirs with one and two cycles." Proceedings of the Institution of Civil Engineers - Water Management 166, no. 1 (January 2013): 27–42. http://dx.doi.org/10.1680/wama.11.00032.

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29

Borghei, Seyed Mahmood, Mohammad Ali Nekooie, Hadi Sadeghian, Mohammad Reza Jalili Ghazizadeh, Ali Parvaneh, James Yang, Amir Javaheri, and Abdorreza Kabiri-Samani. "Discussion: Triangular labyrinth side weirs with one and two cycles." Proceedings of the Institution of Civil Engineers - Water Management 169, no. 3 (June 2016): 111–14. http://dx.doi.org/10.1680/jwama.15.00032.

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30

Bijankhan, M., and S. Kouchakzadeh. "Unified discharge coefficient formula for free and submerged triangular labyrinth weirs." Flow Measurement and Instrumentation 57 (October 2017): 46–56. http://dx.doi.org/10.1016/j.flowmeasinst.2017.08.007.

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31

Azimi, Amir Hossein, and Hossein Bonakdari. "Experimental Investigation of One-Cycle Triangular Labyrinth Weirs with an Upstream Pool." Journal of Irrigation and Drainage Engineering 146, no. 7 (July 2020): 06020005. http://dx.doi.org/10.1061/(asce)ir.1943-4774.0001484.

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32

Parvaneh, Ali, Abdorreza Kabiri-Samani, and Mohammad Ali Nekooie. "Discharge Coefficient of Triangular and Asymmetric Labyrinth Side Weirs Using the Nonlinear PLS Method." Journal of Irrigation and Drainage Engineering 142, no. 11 (November 2016): 06016010. http://dx.doi.org/10.1061/(asce)ir.1943-4774.0001081.

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33

Haghiabi, Amir Hamzeh, Abbas Parsaie, and Samad Ememgholizadeh. "Prediction of discharge coefficient of triangular labyrinth weirs using Adaptive Neuro Fuzzy Inference System." Alexandria Engineering Journal 57, no. 3 (September 2018): 1773–82. http://dx.doi.org/10.1016/j.aej.2017.05.005.

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Majedi Asl, M., and M. Fuladipanah. "Application of the Evolutionary Methods in Determining the Discharge Coefficient of Triangular Labyrinth Weirs." Journal of Water and Soil Science 22, no. 4 (March 1, 2019): 279–90. http://dx.doi.org/10.29252/jstnar.22.4.279.

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35

Emin Emiroglu, M., and Ahmet Baylar. "Influence of Included Angle and Sill Slope on Air Entrainment of Triangular Planform Labyrinth Weirs." Journal of Hydraulic Engineering 131, no. 3 (March 2005): 184–89. http://dx.doi.org/10.1061/(asce)0733-9429(2005)131:3(184).

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36

Monjezi, Reza, Mohammad Heidarnejad, Alireza Masjedi, Mohammad Hosein Purmohammadi, and Amirabbas Kamanbedast. "Laboratory investigation of the Discharge Coefficient of flow in arced labyrinth weirs with triangular plans." Flow Measurement and Instrumentation 64 (December 2018): 64–70. http://dx.doi.org/10.1016/j.flowmeasinst.2018.10.011.

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37

Aghashirmohammadi, Ghasem, Mohammad Heidarnejad, Mohammad Hossein Purmohammadi, and Alireza Masjedi. "Experimental and numerical study the effect of flow splitters on trapezoidal and triangular labyrinth weirs." Water Science 37, no. 1 (May 10, 2023): 28–39. http://dx.doi.org/10.1080/23570008.2023.2210391.

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38

Parsaie, Abbas, and Amir Hamzeh Haghiabi. "Improving Modelling of Discharge Coefficient of Triangular Labyrinth Lateral Weirs Using SVM, GMDH and MARS Techniques." Irrigation and Drainage 66, no. 4 (March 19, 2017): 636–54. http://dx.doi.org/10.1002/ird.2125.

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39

Kisi, Ozgur, M. Emin Emiroglu, Omer Bilhan, and Aytac Guven. "Prediction of lateral outflow over triangular labyrinth side weirs under subcritical conditions using soft computing approaches." Expert Systems with Applications 39, no. 3 (February 2012): 3454–60. http://dx.doi.org/10.1016/j.eswa.2011.09.035.

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40

Ariyamanesh, Atiye, and Mohammad Heidarnejad. "Laboratory investigation of the discharge coefficient of triangular labyrinth weirs with and without slots and comparing them with piano key weirs*." Irrigation and Drainage 69, no. 5 (July 26, 2020): 1167–75. http://dx.doi.org/10.1002/ird.2509.

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41

Hossein Zaji, Amir, Hossein Bonakdari, and Sohrab Karimi. "Radial Basis Neural Network and Particle Swarm Optimization-based equations for predicting the discharge capacity of triangular labyrinth weirs." Flow Measurement and Instrumentation 45 (October 2015): 341–47. http://dx.doi.org/10.1016/j.flowmeasinst.2015.08.002.

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42

Sangsefidi, Yousef, Mohammadamin Torabi, and Hassan Tavakol-Davani. "Discussion on “Laboratory investigation of the discharge coefficient of flow in arced labyrinth weirs with triangular plans” by Monjezi et al. (2018)." Flow Measurement and Instrumentation 72 (April 2020): 101709. http://dx.doi.org/10.1016/j.flowmeasinst.2020.101709.

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43

Weidong, Huang. "Discussion of “Influence of Included Angle and Sill Slope on Air Entrainment of Triangular Planform Labyrinth Weirs” by M. Emin Emiroglu and Ahmet Baylar." Journal of Hydraulic Engineering 132, no. 7 (July 2006): 747–48. http://dx.doi.org/10.1061/(asce)0733-9429(2006)132:7(747).

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Emiroglu, M. Emin, and Ahmet Baylar. "Closure to “Influence of Included Angle and Sill Slope on Air Entrainment of Triangular Planform Labyrinth Weirs” by M. Emin Emiroglu and Ahmet Baylar." Journal of Hydraulic Engineering 132, no. 7 (July 2006): 748. http://dx.doi.org/10.1061/(asce)0733-9429(2006)132:7(748).

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Monjezi, R., M. Heidarnejad, A. R. Masjedi, M. H. Pourmohammadi, and A. Kamanbedast. "An Experimental Investigation into the Effect of Curve Radius on the Discharge Coefficient in Curved-Linear and Curved-Labyrinth Weirs with a Triangular Plan." Journal of Water and Soil Science 23, no. 2 (September 1, 2019): 87–101. http://dx.doi.org/10.29252/jstnar.23.2.87.

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46

Ansari, U. S., and L. G. Patil. "Numerical analysis of triangular labyrinth side weir in triangular channel." ISH Journal of Hydraulic Engineering, January 29, 2020, 1–8. http://dx.doi.org/10.1080/09715010.2020.1715269.

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Kilic, Zeyneb, and M. Emin Emiroglu. "Study of hydraulic characteristics of trapezoidal piano Key side weir using different approaches." Water Supply, July 14, 2022. http://dx.doi.org/10.2166/ws.2022.264.

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Abstract Side weirs are widely used in hydraulic engineering applications. The studies on the subject have been generally focused on classical and labyrinth side weirs. However, the same is not true for piano key side weir (PKSW) in a straight channel. Piano key weir (PKW) has high discharge capacity according to classical weirs. In this study, the hydraulic characteristics of a trapezoidal piano key side weir (TPKSW) in straight channels are investigated experimentally. In all experiments, the hydraulic characteristics of nine TPKSW models are studied extensively using the De Marchi, Domínguez and Schmidth approaches in the subcritical flow regime, with Froude number range 0.12 < F1 < 0.87. The results show that a TPKSW provides better performance compared to traditional rectangular and triangular labyrinth side weirs. Specifically, for the 0.12 < F1 < 0.4 condition, the efficiencies of a TPKSW and trapezoidal labyrinth side weir are close to each other. A trapezoidal labyrinth side weir is more efficient than a TPKSW at larger Froude numbers. The discharge capacity of the TPKSW is 2.9 to 12 times higher than the rectangular side weir. The mean absolute percentage error between the experimental and numerical results is less than 10%. Scatter diagrams are obtained for CPW and F1 numbers using various approaches available in the literature. The diagram generated by the De Marchi approach has much less scattering, compared to the diagrams generated by the Domínguez and Schmidth approaches. It has been determined that TPKSWs are an effective type of side weir in lateral flows. Lastly, an empirical equation has been obtained for the discharge coefficient, which is in good agreement with the experimental data.

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Mustafa, Mohammad Danish, Talib Mansoor, and Mohammad Muzzammil. "Support vector machine (SVM) approach to develop the discharge prediction model for triangular labyrinth weir." Water Supply, November 17, 2022. http://dx.doi.org/10.2166/ws.2022.393.

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Abstract Most of the studies on labyrinth weir were carried out in the laboratory, and regression models have been developed for discharge coefficient in terms of pertinent independent parameters. It is difficult to obtain an exact analytical solution to the head discharge relationship due to the existence of 3D flow. Consequently, various forms of soft computing techniques are used as an appropriate alternative to achieve greater accuracy in developing a discharge prediction model. In the present study, SVR has, therefore, been implemented to develop a discharge coefficient prediction model for a triangular labyrinth weir using a sizeable amount of laboratory data available in the literature. An attempt has also been made to obtain a simple discharge coefficient equation using the same data based on the non-linear regression approach for field application. A comparative study has been carried out to assess the accuracy of the discharge coefficient models obtained in the present study and those reported in the literature. Sensitivity analysis has been made to study the influence of individual parameters on the discharge coefficient. The accuracy of different discharge coefficient prediction models was also tested for the data of prototype Labyrinth Weir and appropriate models were recommended for the field application.

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Mahmoud, Ali, Xiaohui Yuan, Marwan Kheimi, and Yanbin Yuan. "Interpolation Accuracy of Hybrid Soft Computing Techniques in Estimating Discharge Capacity of Triangular Labyrinth Weir." IEEE Access, 2021, 1. http://dx.doi.org/10.1109/access.2021.3049223.

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Derakhshanifard, Mohammad, Mohammad Heidarnejad, Alireza Masjedi, Amin Bordbar, and Aslan Egdarnejad. "Investigation of Effect of Creating an Additional Cycle Along the Lateral Weir of Trapezoidal and Triangular Labyrinth Weirs on the Hydraulic Performance of the Weir Using a Physical Modelling." SSRN Electronic Journal, 2022. http://dx.doi.org/10.2139/ssrn.4165968.

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