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Last modified
7/14/2009 5:02:34 PM
Creation date
5/17/2009 11:51:20 PM
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UCREFRP
UCREFRP Catalog Number
9319
Author
Mueller, G., M. Horn, Q. Bradwisch and L. Boobar.
Title
Examination of Native Recruitment and Description of the Fish Communities Found in the San Jan and Colorado River Interface Zones of Lake Powell, Utah.
USFW Year
2001.
USFW - Doc Type
01-159,
Copyright Material
NO
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ABSTRACT OF DISSERTATION <br />PHYSICAL PROCESSES AND HABITAT CRITICAL TO THE <br />ENDANGERED RAZORBACK SUCKER ON THE GREEN RIVER, UTAH <br />The last self sustaining, riverine population of razorback sucker occurs <br />on the middle Green River. Since 1962, operations at Flaming Gorge Dam have <br />reduced flow variability, reduced duration of flood peak, and altered timing of <br />spring flows. These flow changes modified fluvial processes related to sediment <br />movement and deposition at the primary spawning site and connectivity to <br />downstream floodplain nursery habitat which are critical to razorback sucker <br />` reproductive success. <br />Physical and biological studies related to the early life history of the <br />razorback sucker were conducted from 1992 to 1996. The primary spawning <br />site of the middle Green River population is located along the right side of an <br />alluvial channel around a large island at river kilometer 500. Physical <br />evaluation of the primary spawning bar was conducted using repeated cross <br />sectional surveys and one dimensional HEC-2 and HEC-6 modeling. This <br />analysis found this site to be influenced by the backwater effect of a constriction <br />at the downstream end of the island complex. This backwater condition causes <br />reduced velocity and reduced water surface-slope in the spawning channel as <br />flows rise during spring runoff. <br />HEC-6 analysis was conducted using averaged post-dam USGS <br />t suspended load data, 1996 USGS bedload data, and 1993 bed material samples. <br />The magnitude and pattern of model-simulated deposition and scour were very <br />similar to empirical measurements in 1993 and 1996. Major sedimentation at <br />the site (HEC-6 output) began at 325 m's"' and ultimately resulted in an average <br />of 0.6 meters deposition of sand at peak flows approaching 650 m's''. Model <br />simulation and physical measurements at the site showed that sediment was <br />iii '
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