Hydraulic design of labyrinth weirs by Henry T. Falvey

By Henry T. Falvey

This accomplished instruction manual at the hydraulic layout of labyrinth spillways - from conception to present perform - offers a state of the art technique for the potent layout of labyrinth weirs. The ebook first presents a basic knowing of the idea of labyrinth weirs and keeps with specified sections on major elements that have an effect on the release features of labyrinth weirs corresponding to crest form, weir top, and sidewall perspective. the commonest layout curves are mentioned, and from those a advice is constructed for just one layout curve for use in destiny designs. yet simply because website stipulations usually range loads from the idealized stipulations defined during this ebook, a piece on site-specific modeling standards is integrated for making actual predictions of prototype functionality. In its evaluation of previous stories, the e-book heavily examines many lengthy held ideas, in particular in regards to the notion of interference, nappe oscillation, and the definition of which head to exploit in layout computations, and revises them with a purpose to enhance present pondering in keeping with the most recent learn. With its evaluation of theoretical recommendations and its easy presentation of the sensible elements of layout, either training engineers and researchers will locate this e-book to be a ''must-have'' reference for the hydraulic layout of labyrinth weirs. The chapters comprise: Analytic improvement; Nappe Interference; Crest Shapes; layout Curves; Downstream Chute; Nappe Oscillation; layout; Sedimentation and Ice; Aeration; precise situations; and version stories. to assist advisor the clothier, an appendix presents a consultant pattern of the prototype installations and their dimensions which have been developed all over the world

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1975). " American Society of Civil Engineering, Journal of the Hydraulics Division, 101(HY3), 385-401, with permission of ASCE. HYDRAULIC DESIGN OF LABYRINTH WEIRS 21 Figure 3. , (1975). " American Society of Civil Engineering, Journal of the Hydraulics Division, 101(HY3), 385-401, with permission of ASCE. indicates that the sidewalls are parallel with the channel centerline. For a finite apex dimension, an angle of 0° would correspond to a rectangular weir. Indlekofer and Rouve used two definitions for the length of the disturbance.

Figure 8. , (1995). "Design of labyrinth spillways. " American Society of Civil Engineering, Journal of Hydraulic Engineering, 121(3), 247-255. HYDRAULIC DESIGN OF LABYRINTH WEIRS 54 The data were fit with an equation of the form The coefficients are given in the following matrix Table 1. Coefficients for Design Curve a A! 44 0 To determine intermediate values of a, compute the discharge coefficient for the two adjacent angles and then interpolate between the values. Do not interpolate between the coefficients.

59 for the tests with the quarter-round profiles. A power law gives the profile downstream of the crest. S. Bureau of Reclamation (1974) gives the discharge for a nappe profile as In this case, the discharge coefficient is dimensional. The coefficient is equivalent to Figure 7. Discharge Coefficient for a Nappe Profile The value of the coefficient, Cd, for various design heads is shown in Figure 7. These coefficients have been computed from the curves given by Hoffman (1974). Note: the curves by Hoffman are plotted as a function of P/H0, not Ho/P.

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