Effect of the shape and type of piano key weirs on the flow efficiency

Bekheet, Amr A.; AboulAtta, Nahla M.; Saad, Neveen Y.; El-Molla, Doaa A.

doi:10.1016/j.asej.2021.10.015

Cited by 13 publications

(4 citation statements)

References 20 publications

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“…For closures made of modular vinyl beams, the main research task is to estimate the hydraulic capacity of the entire module. Summing up the capacity of the rectilinear and curvilinear elements helped to calculate the exceedance of nominal discharges, namely polygonal, saw-labyrinthine, and keyboard drains [6,28]. The tested regulators were characterized by frontal water inflow, while [29][30][31][32][33][34] had analyzed them as side weirs.…”

Section: Study Modelsmentioning

confidence: 99%

Modular Regulators of Water Level in Ditches of Subirrigation Systems

et al. 2022

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Economical management of water resources involves water management on a national scale, including river basins and catchment areas, as well as on the scale of drainage systems. One of the devices for controlling the outflow of groundwater from a network of ditches is a flow regulator. In this work, three flow regulators were studied for their water damming capacity in the drainage network and the adjacent ground with the aim of determining their hydraulic characteristics and operating conditions. The adjustment consisted of changing the closing height in order to obtain the required damming level in a ditch. All three tested regulators were characterized by the presence of effective flow Qe, the value of which was determined for different damming levels. Water leaks occurred mainly in places where the damming elements were embedded in vertical guides and, to a lesser extent, at the horizontal joints of successively placed beams. The impact of the overflow shape and the development of the crest line on the obtained flow rate increase was different for the tested S, U, and Z models. The expansion coefficient of the overflow crest equaled kr = 1.0 for the rectilinear S regulator, kr = 1.58 for the labyrinth U regulator, and kr = 1.74 for the compound Z regulator. For the S4 variant, the modular total flow factor reached kQ = 1.19 for the elevation of the upper water above the overflow H = 14.9 cm. The U2 variant was characterized by a modular flow coefficient of kQ = 1.48 for H = 10.7 cm. For the Z1 variant with a cylindrical corner shape, the modular flow coefficient value was kQ = 1.60 for H = 8.2 cm in elevation. For the Z2 variant with an angular corner shape, kQ = 1.63 for H = 8.4 cm.

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Section: Study Modelsmentioning

confidence: 99%

Modular Regulators of Water Level in Ditches of Subirrigation Systems

et al. 2022

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“…Additionally, with increasing the dimensionless parameters h/L e (weir length magnification ratio) and h/P (head water ratio), the discharge coefficient decreased. Bekheet et al [23] examined the effect of the shape and type of piano key weirs on flow efficiency. They found that the ratio W i /W o is the most studied effective parameter on the PKW flow efficiency, followed by the weir's shape and then its type.…”

Section: Introductionmentioning

confidence: 99%

Laboratory Study of the Hydraulic Performance of the A-Type Triangular Piano Key Weir

Alizadeh Sanami,

Ghaderi,

Alizadeh Sanami

et al. 2023

Water

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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 discharge in similar laboratory conditions compared to linear key weirs due to their longer length. For a given h/P ratio (h is the water head over the weir crest, and P is the weir height) and constant length (Le), an increase in the weir height from 0.07 m to 0.15 m decreases the discharge coefficient by approximately 20%. From sensitivity analysis, the most influential parameters for the tested TPKW models are the h/Le dimensionless ratio, followed by the P/Le and Fr. Moreover, the discharge coefficient has a reverse trend when the dimensionless parameters h/P, h/Le, and Froude number are increased. However, with decreasing h/Le, the discharge coefficient of TPKW tends to that of a broad-crested weir because of local submergence. It is expected that the results obtained will be a reference for researchers who work in this field.

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“…Singh, D. and Kumar, M 9) studied the application of PKW, showing its effectiveness for a spillway structure. Amr A. Bekheet et al 29) investigated the effect of PKW shape on flow efficiency using a variety of dam shapes (rectangle, trapezoid, and triangle), demonstrating that the Wi/Wo ratio is the most influential factor on flow. Deepak Singh and Munendra Kumar 30) used the GEP model to predict the energy dissipation of the flow through type A of the PKW, and the results showed good efficiency, with an average error of less than 5.4%.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Discharge Coefficient of Type A Piano Key Weir for Water Resource Sustainable Development

Nguyen Minh Ngoc,

Le Van Nghi,

Doan Thi Minh Yen

2023

Evergreen

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The piano key weir (PKW) is a spillway with inlet and outlet keys that are similar to piano keys. Depending on the water head and the width of the outlet keys, the flow into the inlet keys and through the outlet keys is directed by partition walls, resulting in a flow characteristic that differs from that of a traditional spillway. This paper presents some flow characteristics of the type A rectangular PKW and research on physical models in a laboratory flume, 22 m in length, 0.8 m in width, and 1 m in height. We found the equation that tells us how much water flows through the PKW in the full regime and the incomplete regime of the outlet key when Ho/Wo = 0.5 is the boundary value. The equation was built for flow states and convenient calculations, with an accuracy of less than 8.03% compared to experimental data. Beside, statistical indicators between measured value and predicted values are good (RMSE = 0.022; MAE = 0.017; MAPE = 2.0%), especially in correlation coefficient is strong (R 2 = 0.98). Using the data of other authors, the calculation efficiency of the proposed formulas is also very suitable, giving a very strong correlation coefficient (R 2 > 0.9) and other statistical indicators close to the ideal point (zero). This shows that the proposed equations are very suitable to evaluate the flow capacity through the PKW and effective in water management and sustainable development at river basin.

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Effect of the shape and type of piano key weirs on the flow efficiency

Cited by 13 publications

References 20 publications

Modular Regulators of Water Level in Ditches of Subirrigation Systems

Modular Regulators of Water Level in Ditches of Subirrigation Systems

Laboratory Study of the Hydraulic Performance of the A-Type Triangular Piano Key Weir

Experimental Study on the Discharge Coefficient of Type A Piano Key Weir for Water Resource Sustainable Development

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