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Last modified
7/14/2009 5:02:34 PM
Creation date
6/1/2009 12:42:10 PM
Metadata
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UCREFRP
UCREFRP Catalog Number
8270
Author
Hayse, J. W., S. F. Daly, A. Tuthill, R. A. Valdez, B. Cowdell and G. Burton.
Title
Effect of Daily Fluctuations from Flaming Gorge Dam on Ice Processes in the Green River.
USFW Year
2000.
USFW - Doc Type
ANL/EA/RP-102041,
Copyright Material
NO
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resulting changes in stage would be approximately 1.5 m at the Greendale, Utah gage (located <br />0.8 km downstream of Flaming Gorge Dam), approximately 1.3 m at the Gates of Lodore (77 km <br />downstream) and approximately 0.6 m at the Jensen, Utah gage (150 km downstream) (Yin et al. <br />1995). Because this release pattern represents the extreme of powerplant operations, daily water <br />stage fluctuations from other operational patterns would be less pronounced. Low flow releases <br />from the dam typically occur at night. Flows usually increase rapidly between 0600 and 0800 <br />hours to the maximum flow rate and then remain approximately constant throughout the day. <br />The flow rate usually decreases between 1800 and 2200 hours back to the minimum flow. The <br />actual release pattern reflects power demand which may vary on any given day. <br />Hourly releases from Flaming Gorge Dam and the resulting flows recorded at the Jensen <br />gage during the 1997 portion of the field study are presented in Figure 18. During the three <br />weeks before the peaking period, Flaming Gorge Dam maintained a constant outflow of 1,900 <br />cfs, resulting in a relatively steady discharge of approximately 2,440 cfs at the Jensen Gage. <br />Diurnally peaking releases from Flaming Gorge Dam were initiated at 0700 hours on 25 January <br />1997, with a range of 800 to 3,000 cfs and a mean outflow of 1,900 cfs. Approximately 1.5 days <br />later, fluctuations related to this peaking cycle were detected at the Jensen gage and resulted in <br />flows that ranged from 1,700 cfs to 3,500 cfs during 26-31 January 1997 (Figure 18). <br />3.1.2 Water and Air Temperatures <br />The mean daily air temperature for Vernal, Utah from 1945-1997 was below 0 °C by <br />about the middle of November and remained below 0 °C through the winter and until early <br />March (Figure 19). From mid-December until early February, the mean daily air temperature <br />generally remained below -6 °C. The maximum number of freezing degree days for a number of <br />winters are listed in Table 2 and shown in Figure 20. <br />The mean daily air temperature at Vernal, the temperature of the water released from <br />Flaming Gorge Dam, and the water temperature recorded at the Jensen gage are shown in Figures <br />21 through 28 for the winters of 1989 to 1997 (USGS discontinued collection of water <br />temperature data at the Jensen gage prior to the winter of 1996-1997). Also shown in these <br />figures is the daily average discharge of the Green River at the Jensen gage for the same period. <br />It can be seen that the water temperature at Jensen was influenced both by the Flaming Gorge <br />release water temperature and the air temperature. The Green River water temperature at Jensen <br />reached 0 °C for at least a brief period during each of these winter periods and remained at 0 °C <br />for considerable periods of time for several winters. During the periods when the water <br />temperature was at or near 0 °C, the daily average air temperature was continuously below 0 °C, <br />often reaching minimums of -12 °C or less. It is during periods of very cold air temperatures and <br />with the water temperature entering the study reach at or near 0 °C that maximum ice production <br />in the study reach would be expected to occur. <br />-15-
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