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Temperature and velocity measurements and predictive model comparisons in the near-field region of surface thermal discharges

Description: Simultaneous temperature and velocity measurements were made in the near- field region of the surface thermal discharge at the Point Beach Unit 1 and Palisades Nuclear Power Plants on Lake Michigan. Data collected include measurements of temperature and velocity at the 0.5-, 1.0-, 1.5-, 2.0-, 2.5-, and 3.0-m depths, along with measurements of ambient lake and metenrological conditions. Bottom depth was also measured at variouss locations. four such surveys were made at the Point Beach plant, three at the Palisades plant. To examine the jet features from the abpve surveys and facilitate a comparison with analytical model predictions, a computer program was written to smooth the data, extracting such jet characteristics as trajectory, centerline temperature decay and temperature half-widths, centerline velocitv decay and velocity half-widths, temperature and velocity half-depths, and isotherm areas. Four near-field analytical models often used in environmental impact evaluations of power-plant surface discharges are compared to the jet characteristics determined from the smoothed jet data. The Pritchard model compares rather well with these limited data and is often conservative when model-data discrepancies exist. The Stolzenbach -Harleman and Prych models predict too rapid a temperature and velocity decay accompanying too great a lateral spread. The Motz --Benedict model is too sensitive to an entrainment coefficient E with little consistent data available for its determination for accurate prediction. Recommendations for future research, encompassing the field-data acquisition, the smoothing procedure, and the presently available models are included. (30 references) (auth)
Date: October 1, 1973
Creator: Paddock, R.A.; Policastro, A.J.; Frigo, A.A.; Frye, D.E. & Tokar, J.V.
Partner: UNT Libraries Government Documents Department