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Title: Simultaneous, multiple-level release from stratified reservoirs : hydraulic laboratory investigation
Authors: United States. Army. Corps of Engineers. Huntington District.
United States. Army. Corps of Engineers. Louisville District.
United States. Army. Corps of Engineers. Ohio River Division.
Bohan, Joseph P.
Gloriod, Terrence L.
Keywords: Hydraulic models
Stratified flow
Velocity measurement
Water quality
Reservoir drawdown
Issue Date: Dec-1972
Publisher: Hydraulics Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Research report (U.S. Army Engineer Waterways Experiment Station) ; H-72-3.
Description: Research Report
Abstract: Laboratory research was conducted at the U. S. Army Engineer Waterways Experiment Station (WES) to determine the characteristics of the withdrawal zone resulting from the simultaneous release of flows from a randomly stratified impoundment through outlets located at different elevations. Stratification was generated in experimental facilities by creating differentials in both temperature and dissolved salt. The density profile was determined by measuring the temperature and conductivity profiles and combining the effects on density of these two factors. The velocity distributions were obtained by filming the displacement of a dye streak in the flow. Superimposing the separate and distinct velocity profiles for each of the outlets based on single-outlet operation (as used in a previous WES investigation) to obtain the composite velocity profile, due to simultaneous release through two outlets, did not yield completely satisfactory comparisons between predicted and observed results. Further analyses were made to develop a generalized technique, which involved a controlled shift of the withdrawal limits in the zone of overlap prior to superimposing the two separate and distinct velocity profiles. This technique yielded good agreement between observed and predicted, selective withdrawal characteristics. When the composite velocity profile in the reservoir has been determined by the recommended method, a weighted-average technique can be applied to determine the value of any water-quality parameter in the outflow for which a vertical distribution within the reservoir is known.
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