Grace, John L. Jr.
[Verfasser:in]
;
United States. Army. Corps of Engineers. Little Rock District.
[Mitwirkende:r];
United States. Army. Corps of Engineers. Tulsa District.
[Mitwirkende:r]
Selective Withdrawal Characteristics of Weirs: Hydraulic Laboratory Investigation
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Source: https://erdc-library.erdc.dren.mil/jspui/ ; During 1969, the Corps of Engineers initiated laboratory research at the U. S. Army Engineer Waterways Experiment Station to determine the characteristics of withdrawal zones resulting from release of flows from randomly stratified lakes over weirs for developing means of predicting and controlling the quality of water discharged through downstream, fixed-level regulating structures. Stratification was generated in experimental facilities by means of differentials in both temperature and dissolved salt concentration. Density distributions were determined from temperatures and salinities measured with thermistors and conductivity probes. Velocity distributions were obtained by dropping dye particles into the flow and photographing the resulting streaks with movie cameras. Generalized expressions describing the limits of the zone of withdrawal and distribution of velocities therein were developed from analyses of the velocity and density distribution data. Means for evaluating those conditions where the free surface and/or bottom boundary dictates the upper and/or lower limits of the withdrawal zones were also determined. With the capability of predicting the velocity distribution to be anticipated for any given density distribution upstream of a weir, the weighted average technique can be applied to predict the value of any water-quality parameter of the outflow for which a profile in the lake is known.