New Method for Estimation of Discharge

A new technique for drawing isovel patterns in an open or closed channel is presented. It is assumed that the velocity at each arbitrary point in the conduit is affected by the hydraulic characteristics of the boundary. While any velocity profile can be applied to the model, a power-law formula is used here. In addition to the isovels patterns, the energy and momentum correction factors ( α and β ), the ratio of mean to maximum velocity (V∕ umax ) , and the position of the maximum velocity are calculated. To examine the results obtained, the model was applied to a pipe with a circular cross section. A comparison between the profiles of the proposed model and the available power-law profile indicated that the two profiles were coincident with each other over the majority of the cross section. Furthermore, the predicted isovels were compared with velocity measurements in the main flow direction obtained along the centerline and lateral direction of a rectangular flume. The estimated discharge, based on meas...

[1]  M. Hanif Chaudhry,et al.  Open-Channel Flow , 2007 .

[2]  Maurice J. Duncan,et al.  Relatively Rough Flow Resistance Equations , 2002 .

[3]  Y. Chiew,et al.  Response of Velocity and Turbulence to Sudden Change of Bed Roughness in Open-Channel Flow , 2003 .

[4]  Cheng‐lung Chen,et al.  Unified Theory on Power Laws for Flow Resistance , 1991 .

[5]  Paul A. Carling,et al.  Velocity and turbulence measurements for two overbank flow events in River Severn , 2002 .

[6]  B. Yen.  Open Channel Flow Resistance , 2002 .

[7]  Koen Trouw,et al.  Shear Stress Distribution in Partially Filled Pipes , 2003 .

[8]  J. A. Buck,et al.  Engineering Electromagnetics , 1967 .

[9]  S. Wright,et al.  Density Stratification Effects in Sand-Bed Rivers , 2004 .

[10]  K. Babaeyan-Koopaei,et al.  Two-Dimensional Solution for Straight and Meandering Overbank Flows , 2000 .

[11]  V. T. Chow.  Open-channel hydraulics , 1959 .

[12]  Angus R. Simpson,et al.  LEAK DETECTION IN PIPELINES USING THE DAMPING OF FLUID TRANSIENTS , 2002 .

[13]  Chao-Lin Chiu,et al.  Maximum Velocity and Regularities in Open-Channel Flow , 2002 .

[14]  Vito Ferro,et al.  Flow Velocity Measurements in Vegetated Channels , 2002 .

[15]  W. Plant,et al.  Non-contact flood discharge measurements using an X-band pulse radar (I) theory , 2002 .

[16]  William R. Brownlie,et al.  Flow Depth in Sand-Bed Channels , 1983 .

[17]  Andrew Chadwick,et al.  Hydraulics in Civil and Environmental Engineering , 1993 .

[18]  P. Julien,et al.  Shear Stress in Smooth Rectangular Open- Channel Flows , 2005 .