Session K.pdf - Clarkson University

It was observed that, from Nov. 16, 1999, the air temperature dropped suddenly (figure 8)and the staging effect developed. A 96-hour simulation was conducted, for the period ofNov. 16 to Nov. 19. A composite sine function is used to interpolate the daily maximumand minimum air temperature, as shown in Figure 8, to better reflect the diurnal air temperaturevariation. The staging and water discharge during this time period are shown inFigures 9 and 10. The water temperature and frazil concentration distributions are affectedby the air temperature variation and also by the water discharge cycling. The simulatedwater temperature and frazil concentration distributions, assuming that the water temperatureof the discharge from the station is 0.05 o C, are shown on Figures 11 and 12 at the endof the simulation (hour 96).50-5Generated CurveMaximumAverageMinimumTemperature ( o C)-10-15-20-25-300 24 48 72 96 120 144 168 192 216 240Time (Hours from Nov. 16, 1999)Fig. 8. Air temperature from Nov. 16, 1999CONCLUSIONSA coupled two-dimensional depth-averaged flow and thermal-ice model is developed.The flow model is capable of simulating mixed flow conditions with the capability oftreating dry-and-wet bed conditions with fluctuating discharges. The thermal-ice modelis capable of simulating water temperature and frazil concentration distributions. Themodel is applied to the tailwater of the Limestone Generating Station to simulate theflow and water temperature/frazil ice conditions. The model is to be extended to studythe formation of anchor ice dams in the Sundance Rapids area of the river reach.328