Assessing effects of geometry of lateral spillway in hydraulic conductivity coefficient of lateral spillway of embankment channels

چکیده مقاله

Since wide-edge spillway is easy to construct and cost effective, they would be applied widely in water transfer systems as an instrument to measure flow intensity and control balance of water surface. Due to wide range application of wide-edge spillways, if its section dimensions become optimized, the design would be cost effective. An overview on previous literature indicates that, there has been no considerable work in regard with discharge on wide-edge spillways with trapezoidal section so far. The present study aims at conducting dimensional analysis and determining dimensionless parameters. The study would conclude that, discharge coefficient of lateral spillways is a function of upstream Froude number of spillway Fr1; spillway threshold P; and spillway length to width of channel bottom ratio L/b. the main objective of the present study is to investigate hydraulic of flow and determine intensity coefficient of flow in wide-edge lateral spillways, located in trapezoidal embankment channel. Therefore, experiments would be done on a spillway with three different heights. In general, 48 tests would be done on a wide-edge lateral spillway with length of 4m and under real conditions in laboratory of Soil Protection Research Center. Using experimental data, the study would conclude that, coefficient of discharge in lateral spillways is a function for threshold of lateral spillway and length to width ratio of the spillway.

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