Session K.pdf - Clarkson University

length was ≈800 m, its average width – ≈80 m, its average section area – ≈300 m 2 . Thetotal thermal diffusivity coefficient with regard to dispersion was supposed to be proportionalto the unit discharge µ = α(Q+ Q + 0.14 ⋅10m /s and was determined on2 2 1/2−6 2theTx y )basis of the in-situ data for the period from October 16, 2002 to December 8, 2002 (whenthere was no ice cover on the reservoir). In Fig.1 the comparison of the calculated andthe in-situ data of the water temperature on the entrance of the NPP is shown.The presented data on modeling of the hydro-ice-thermal situation in the Volga-DonNPP cooler reservoir for the period from October 16, 2002 to January 12, 2003 (whenthere was full average day meteorology data) showed that the beginning of ice formationin the reservoir was on December 1. According to the in-situ data the first shore icein the area of the additional water pump station (AWPS) was observed on December 1and the ice cover formation in the area of AWPS started on December 5. According tothe calculations an ice formation in the intake channel began on December 10. As forthe in-situ data the first shore ice formation in the intake channel took place on December9. The maximum ice thickness in the period was observed in the eastern part of thereservoir-cooler and was ≈0,45 m. The maximum ice thickness in the intake channelwas 0.25 m and was observed near the NPP pump station entrance. As for the tail-racethere was not ice cover formation there. Some results on the calculations of the hydroice-thermalsituation in the reservoir-cooler are shown in Figs 2-7. There was a qualitativeagreement between the numerical results (the ice thickness and the place of the iceholeat the exit of the tail-race) and both the visual in-situ observation data and the photographsobtained from the Volga-Don NPP.Fig. 1. The variation of the temperature at the Volga-Don NPP entrance for the period fromOctober16, 2002 (0 day) to December 8, 2002(53 rd day) (⎯⎯ – calculations; • – in-situ data)347