Free overfall in channels with different cross sections and sub-critical flow

	Free overfall in channels with different cross sections and sub-critical flow
Iranian Journal of Science and Technology Transactions of Civil Engineering
شناسنامه علمی شماره، دوره 30، شماره 1، فروردین 2006، صفحه 97-105 اصل مقاله (281.21 K)
شناسه دیجیتال (DOI): 10.22099/ijstc.2006.766
چکیده
In this paper, based on the free vortex theorem and the momentum equation, a theoretical model to predict the pressure head distribution, the pressure coefficient, the end depth ratio (EDR), and flow discharge at the brink of free overfalls in channels of different cross sections with sub-critical flow is presented. Using available experimental and theoretical results of other investigators for rectangular, triangular, exponential, trapezoidal, inverted triangular (Δ-shaped), inverted semicircular and also circular channels, the proposed method has been examined. The presented theory agrees well with the experiments.
کلیدواژه‌ها
Free overfall؛ brink depth؛ Drop؛ end depth ratio؛ flow measurement

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