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Last modified
7/14/2009 5:02:34 PM
Creation date
5/20/2009 3:39:59 PM
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UCREFRP
UCREFRP Catalog Number
8251
Author
Rakowski, C. L. and J. C. Schmidt.
Title
The Geomorphic Basis of Colorado Squawfish Nursery Habitat in the Green River Near Ouray, Utah.
USFW Year
1996.
USFW - Doc Type
#93-1070,
Copyright Material
NO
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<br />Draft Final Completion Report to UDWR for Contract #93-1070, Amendment 3 <br /> <br />Vi <br /> <br />create nursery habitat. The typical shape of HAC' s is multi-modal for specific sites which may explain why Pucherelli <br /> <br />and others (1990) found a poor relation between discharge and available habitat in this reach. Further research is <br /> <br />necessary in order to evaluate the degree to which site-specific discharge-dependent HAC's can be extrapolated to <br /> <br />longer reaches. <br /> <br />At the detailed study site. the discharge that maximized nursery habitat in 1992 was lower than the mandated <br /> <br />base flows and was higher than the mandated base flows in 1993 and 1994. These data are only for the detailed study <br /> <br />site and cannot be extrapolated throughout the 10-Ian study reach. However. they demonstrate that the use of the same <br /> <br />value for mandated base flows in years of high and low annual floods probably does not actually achieve its intended <br /> <br />goal. <br /> <br />A conceptual model was developed illustrating the response of secondary-channel nursery-habitat availability <br /> <br />over a three-year period during which one large flood occurs (Fig. ES2). This model is based on the field and numerical <br /> <br />modeling results of this study. Lvge floods increase the topographic relief of secondary channels and increase the range <br /> <br />of discharges at which nursery habitat is available. The discharge at which secondary channel habitat availability is <br /> <br />maximized also increases in years of high flood peaks. Subsequent lower floods reduce the secondary channel <br /> <br />topographic relief and therefore decrease the range of discharges over which this habitat is available. The discharge at <br /> <br />~ ~ W 100 IW I~ <br />DISCHARGE. IN CUBIC METERS PER SECOND <br /> <br />FIGURE ES2. Conceptual model of secondary channel habitat cwve. The shape of the cwve and the discharge <br />associated with the maximum area of available habitat changes in response to flood passage. Lvge floods rebuild <br />topography, shifting the peak for available habitat to the right as the overall elevations of the secondary channel is <br />increased. The peask shifts to the left in subsequent low peakyears as the upper end of the secondary channel erodes. <br />The width narrows as the total relief within the secondary channel is reduced. <br /> <br />~ <br />t:: 0.9 <br />~ 0.8 <br />>- <br />~ 0.7 <br />~ <br />en <br />~ 0.6 <br />t.t. 0.5 <br />o <br />< 0.4 <br />~ 0.3 <br /> <br />~0.2 <br />< <br />~O.I <br />o <br />o <br /> <br /> <br />LARGE FLOOD <br /> <br />YEAR I <br /> <br />PEAK <br />SHIFTED <br /> <br />YEAR 2 <br /> <br />20 <br /> <br />I~ <br /> <br />180 <br />
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