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Last modified
7/14/2009 5:02:37 PM
Creation date
5/22/2009 4:40:09 PM
Metadata
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UCREFRP
UCREFRP Catalog Number
9641
Author
Hedrick, T. N., K. R. Bestgen and K. D. Christopherson.
Title
Entrainment of Semi-Buoyant Beads and Razorback Sucker, Xyrauchen texanus, Larvae into Flood Plain Wetlands of the Middle Green River, Utah.
USFW Year
2009.
USFW - Doc Type
C-6/RZ-ENTR,
Copyright Material
NO
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<br />. <br /> <br />. <br /> <br />Thunder Ranch, 2005 <br />Thunder Ranch wetland, Breach 3 (no other breaches were sampled at Thunder Ranch in <br /> <br />2005), entrained the largest number of beads of any wetland over the 2005 sampling period. <br /> <br />Flow volume entrained and the number of beads captured was positively correlated with Green <br /> <br />River flow levels (Table 5, Figure 12) such that the largest number of beads and the highest <br /> <br />percentage of beads entrained occurred at the highest flow sampled. Beads entrained per volume <br /> <br />of water in the river followed this similar pattern, although beads entrained per volume of water <br /> <br />entrained did not. At the lowest flow sampled, Thunder Ranch was minimally connected to the <br /> <br />river and as a result, relatively little water and few beads were entrained. At the two higher <br /> <br />flows, the percentage of beads captured (only those captured in nets in the breach, not the total <br /> <br />entrained), as well as the number per unit volume of water entrained and the number per unit <br /> <br />river flow, were much higher (Table 5). <br />As flows increased at Thunder Ranch, Breach 3 became more effective at entraining <br /> <br />beads. For example, on the first release, 934 yellow beads were captured in the near shore nets <br /> <br />and had already passed the breach. On that same day, 577 yellow beads were entrained at the <br /> <br />breach. At the peak flow, the near shore nets captured only 42 yellow beads, but the breach <br /> <br /> <br />entrained 3,052 yellow beads (Tables 2, 3, and 4). The percentage of total beads captured in the <br /> <br /> <br />near shore net location during the highest flow level at the peak release was only 1 % (the <br /> <br /> <br />majority of beads captured were in the breach), but increased to 61 % (first release) and 35% <br /> <br /> <br />(third release) for the other two releases at lower flows. <br /> <br />In addition to increased bead entrainment effectiveness, Breach 3 became more effective <br /> <br />at entraining mainstem flow at higher river stages (Figure 12). Breach 3 inflow increased from <br /> <br />0.67 m3/sec to 2.01 m3/sec between the first release and the second, and the percentage ofthe <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />38 <br /> <br />. <br />
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