The simultaneous effect of intake discharge ratio and weir magnification on the transfer of bed sediments to the intake channel at the Diversion dam

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DAVOUD MAGHAMI D.; BANEJAD H.; MOZAFFARI J.; MOHSENI MOVAHHED S.A.

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Journal: Journal of Water and Soil Conservation Year:2019 | Volume:26 | Issue:4 Page(s): 191-206

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Title

The simultaneous effect of intake discharge ratio and weir magnification on the transfer of bed sediments to the intake channel at the Diversion dam

Author(s)

DAVOUD MAGHAMI D. | BANEJAD H. | MOZAFFARI J. | MOHSENI MOVAHHED S.A. | Issue Writer Certificate

Keywords

Diversion DamQ2

IntakeQ1

SedimentQ1

Weir MagnificationQ2

Abstract

Background and Objectives: Weirs are widely used to measure flow, water deviation and flow control in open channels. So far, most of the weirs used in the Diversion Dams were linear. In this study, the effect of Sediment properties transmitted in the main channel and Intake channel has been studied by changing the weir shape from linear to duckbill with magnification 2 and 3. Materials and Methods: The research was carried out at the Hydraulic Laboratory of the Water Engineering Department of Bu-Ali Sina University. The experiments were carried out in flume lengths of 10 meters, width of 83 cm and height of 50 cm. weirs, gate and Intake channels with accessories and reservoir of Sediment collection were also designed and added to the collection. For testing, non-adherent Sediment particles with a grain size of approximately the uniform size and with a diameter of 0. 35 mm were used. Experiments were carried out with a layer of Sediments of thickness of 4 cm and slope of 0. 005 and in two discharges of 40 and 60 liters per second. At first, Intake gate and sluice way was closed and a flow with a small discharge entranced until the flow passed on the weir. Then, the discharge increased to 60 or 40 liters per second and Intake gate was opened to a certain amount and the experiments were carried out for a certain period of time. Afterward, the entered Sediments into the Intake channel and also the accumulated Sediment in the mesh of the end of main channel were collected, dried and weighted, and the concentration of Sediments entering the Intake channel and downstream of sluice way were calculated. Results: The results showed that in the discharge of 40 and 60 liters per second and weir with a magnification of 1, the concentration of Sediments deposited into the Intake channel (Csin*6*10-6) was 0. 25 and 0. 65, respectively, which will be equal to 0. 65 and 2. 9, respectively, by increasing the magnification of the overflow to 3. By increasing the Intake discharge ratio from 0. 3 to 0. 4, these values for magnification 1 would be 0. 75 and 1. 7, respectively, and for magnification 3 would be 0. 9 and 1. 5, respectively. In discharge of 60 liters per second and the Intake discharge ratio of 0. 25, with increasing sluice gate discharge ratio from 0 to 0. 1, the Sediment concentration in the Intake channel increased from 0. 25 to 1. 2 for weir with magnification of 1 and from 2. 45 To 7. 1 for weir with magnification of 3, respectively. By increasing the Intake discharge to 0. 4, these values vary from 2 to 5. 1 for magnification of 1 and from 4. 8 to 11 for magnification of 3, respectively. Along with the increase in the magnification ratio of the weir, the concentration of Sediments deposited into the Intake channel in equal Intake discharge ratio increases. The increase in Intake discharge ratio and the increase of sluice gate discharge ratio also increase the concentration of Sediments deposited into the Intake channel. The same applies to the sluice gate. This means that increasing the magnification, increasing discharge, increasing the Intake discharge ratio of and increasing sluice gate discharge ratio will increase the concentration of Sediment input into the sluice gate. Conclusion: Increasing the magnification reduces the flow head and also reduces the flow depth in the upstream, and as a result, velocity and shear stress rate of the flow increases, which results in the transfer of more Sediment to the downstream and, consequently, to the Intake channel. Increasing the opening of the Intake gate and, consequently, increasing the Intake discharge rate, increases the concentration of Sediments deposited to the Intake channel, However, increasing the Weir Magnification has no Significant influence on efficiency (the Sediment concentration ratio of the Intake channel to the main channel). But increasing the sluice gate discharge ratio leads to a decrease in the efficiency of the concentration of Sediments entering the Intake. So that the efficiency has been changed by increasing the discharge rate from 0. 25 to 0. 4, from 2. 8 to 2. 3 for weir with magnification 1 and from 3. 3 to 2 for weir with magnification of 3.

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APA: Copy

DAVOUD MAGHAMI, D., BANEJAD, H., MOZAFFARI, J., & MOHSENI MOVAHHED, S.A.. (2019). The simultaneous effect of intake discharge ratio and weir magnification on the transfer of bed sediments to the intake channel at the Diversion dam. JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), 26(4 ), 191-206. SID. https://sid.ir/paper/156100/en

Vancouver: Copy

DAVOUD MAGHAMI D., BANEJAD H., MOZAFFARI J., MOHSENI MOVAHHED S.A.. The simultaneous effect of intake discharge ratio and weir magnification on the transfer of bed sediments to the intake channel at the Diversion dam. JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES)[Internet]. 2019;26(4 ):191-206. Available from: https://sid.ir/paper/156100/en

IEEE: Copy

D. DAVOUD MAGHAMI, H. BANEJAD, J. MOZAFFARI, and S.A. MOHSENI MOVAHHED, “The simultaneous effect of intake discharge ratio and weir magnification on the transfer of bed sediments to the intake channel at the Diversion dam,” JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), vol. 26, no. 4 , pp. 191–206, 2019, [Online]. Available: https://sid.ir/paper/156100/en

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