http://worldcat.org/entity/work/id/30203244

Center Hill Fuseplug Spillway Caney Fork River, Tennessee: Hydraulic Model Investigation

Model tests of the Center Hill fuseplug spillway mounted on a fixed crest at Caney Fork River, TN, were conducted to develop a satisfactory design that would fail in a orderly fashion at a prescribed rate. Different zones in the prototype fuseplug (such as the upstream and downstream slope protection, the impervious core, and the filter) were represented in the model by different soil types. Model materials were processed and manufactured to simulate certain characteristics of the prototype soil based on sound modeling theory, so that behavior in the model would simulate behavior in the prototype. Grain-size distributions of the granular materials were used to select appropriate grain size of the corresponding model material. Determination of the model grain sizes was made by matching the terminal particle settling velocity (through water) between model and prototype based on Froude numbers. The impervious core in the model consisted of prototype clay taken from the embankment site. Three physical models were used to screen and investigate various designs and to determine if scale effects would significantly influence hydraulic performance of the models. Test results indicated that scale effects were insignificant. A fuseplug design was developed in which the 600-ft-long spillway would fail at a constant rate in approximately 29 min. The models also permitted determination of discharge coefficients for the fixed crest and the magnitude and direction of currents in the exit area ... Center Hill Dam, Tennessee, Erosion rate, Soil properties, Clay core, Fuseplug spillways, Discharge coefficients, Pilot channel.

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