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Paper Information

Journal:   JOURNAL OF AGRICULTURAL ENGINEERING RESEARCH   Spring 2003 , Volume 4 , Number 14; Page(s) 19 To 36.
 
Paper: 

DERIVATION AND VERIFICATION OF HYDRAULIC RELATION OF DEFLECTION-METER FOR DISCHARAGE MEASUREMENT IN IRRIGATION CANALS

 
 
Author(s):  MONEM M.J., MOHAMMAD VALI SAMANI J., MEHRABI E.
 
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Abstract: 
Deflection-meter is a vane inserted in the direction of flow vertically. It is hinged out of water and could swings freely. Flow forces exerted on the vane, divert it from vertical position. This diversion is a function of flow characteristics and vanes geometry, which could be considered as an indicator of flow velocity and discharge. In this research hydraulic relations of rectangular deflection meter-for measuring average flow velocity in canals with rectangular and different and different trapezoidal cross sections are derived. Sixty percent of measured data are used for derivation of relations, and forty percent of data are used for calibration. Using these relations with measuring deflection angle and flow depth, average flow velocity and discharge could be determined. Results of this research show that, vane width has no significant impact on the relations. For rectangular canal a linear relation for vane theoretical velocity and average flow velocity exists. Therefore velocity coefficient is constant and equal to 0.82 two forms of structures head loss is calculated in terms of ratio of upstream and downstream head difference to the upstream head, and head loss coefficient of upstream velocity head. Maximum head loss for rectangular section observed was 3.2% and head loss coefficient was 2.46. for trapezoidal cross sections nonlinear relation between vane theoretical velocity and average flow velocity are derived. The relations show that vane velocity coefficient is variable with respect to the flow velocity. Maximum head loss in the range of 4-45 l/s, were around 1.2%, 2.1% and 2.8% and head loss coefficients were around 1.77, 0.05 and 0.31.
 
Keyword(s): DEFLECTION - METER, DISCHARGE MEASUREMENT, FLOW VELOCITY
 
 
References: 
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Citations: 
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APA: Copy

MONEM, M., & MOHAMMAD VALI SAMANI, J., & MEHRABI, E. (2003). DERIVATION AND VERIFICATION OF HYDRAULIC RELATION OF DEFLECTION-METER FOR DISCHARAGE MEASUREMENT IN IRRIGATION CANALS . JOURNAL OF AGRICULTURAL ENGINEERING RESEARCH, 4(14), 19-36. https://www.sid.ir/en/journal/ViewPaper.aspx?id=2603



Vancouver: Copy

MONEM M.J., MOHAMMAD VALI SAMANI J., MEHRABI E.. DERIVATION AND VERIFICATION OF HYDRAULIC RELATION OF DEFLECTION-METER FOR DISCHARAGE MEASUREMENT IN IRRIGATION CANALS . JOURNAL OF AGRICULTURAL ENGINEERING RESEARCH. 2003 [cited 2021June15];4(14):19-36. Available from: https://www.sid.ir/en/journal/ViewPaper.aspx?id=2603



IEEE: Copy

MONEM, M., MOHAMMAD VALI SAMANI, J., MEHRABI, E., 2003. DERIVATION AND VERIFICATION OF HYDRAULIC RELATION OF DEFLECTION-METER FOR DISCHARAGE MEASUREMENT IN IRRIGATION CANALS . JOURNAL OF AGRICULTURAL ENGINEERING RESEARCH, [online] 4(14), pp.19-36. Available: https://www.sid.ir/en/journal/ViewPaper.aspx?id=2603.



 
 
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