Author(s): Dong Sop Rhee; Chang Wan Kim
Linked Author(s):
Keywords: Side-weir; Discharge coefficient; Open channel flow
Abstract: Side-weirs are essentially free over-flow weirs installed on the levee or along the sides of the main channel to divert or excess water. These hydraulic structures are broadly used in irrigation system or flood control practice like as flood passages or detention sites for floodalleviation purpose. Because flow over side-weir is one of the most complex flows, analyzing this flow is very difficult. Most of former studies, that adopted the analytical solution of De Marchi to study the flow characteristics of side-weirs, only considered their discharge coefficient as a function of the upstream Froude number 1Fr only. However, the ratio between weir height and the upstream flow depth / yh and the ratio between weir length and the main channel width BL / are also considered in the recent researches based on dimensional analysis. The main objective of this study is investigating experimentally the effect of upstream Froude number, weir height, weir length, and main channel width on the discharge coefficient of rectangular sharp crested side-weirs under subcritical flow conditions in a relatively broad rectangular open channel. The effect of four main influential parameters, 1Fr, / yh, BL /, and the ratio between weir length and the upstream flow depth / yL are examined by the flume tests. New estimation equations for the discharge coefficients of sharp-crested side-weir are suggested based on the experimental results of this study. The accuracy of these equations are better when / yL is considered together with other influential parameters. Therefore, the discharge coefficients of sharp-crested side-weir seem to be influenced by / yL. Also, the experimental results of this study are compared with the results of other studies to extend the applicability of pre-suggested formulas for sharp-crested side-weir discharge coefficient. 1 1 1 1
Year: 2007