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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 Fmal Completion Report to UDWR for Contract #93-1070, Amendment 3 <br /> <br />14 <br /> <br />sediment transport equations to model bed evolution. This combination of modeling strategies allows the simulation of <br /> <br />bed evolution and bar genesis in natural channels, and the sediment transport algorithm was formulated using Yalin's <br /> <br />(1963) sediment transport equation. Simulation results of the bed evolution model were compared with results from <br /> <br />Hooke's (1975) flume experiments. The topography predicted by the model was very similar to that produced in the <br /> <br />flume. although location of the deepest scour was predicted downstream rather than upstream of the bend apex. Overall, <br /> <br />the agreement between the sediment fluxes and bottom stresses were quite good. <br /> <br />The expanded model of Nelson and Smith (l989b) was applied to a river reach within the OurayNWR by <br /> <br />Andrews and Nelson (1989). Cross-section topography measured at 275 m3fs was used as model input, and response of <br /> <br />the channel was modeled for steady flow at 3 discharges (50, 275 and 475 m3fs) for 2-day periods. Validation of <br /> <br />modeled bed evolution was not possible. but calculated distribution of unit discharge and sediment transport compared <br /> <br />well to field measurements (Andrews ~ Nelson. 1989). Model results indicated that the river bed adjusted quickly to <br /> <br />changes in discharge. <br /> <br />Application of the And rews and Nelson (1989) <br />Model to the Green River <br /> <br />Channel form and geomorphology determine the availability of nursery habitat. Because channel form reflects <br /> <br />antecedent flows, nursery habitat availability is a product of antecedent flows. While it is not possible to experimentally <br /> <br />measure the response of the channel to all flow scenarios, it is desirable to predict channel response and, hence, habitat <br /> <br />availability for some scenarios. In the Green River basin. only one "experiment" (i.e., flood) occurs each year, and the <br /> <br />magnitude and timing of releases from Flaming Gorge Dam are regulated by many laws. Therefore, each experiment <br /> <br />bas different antecedent conditions. As an alternative, to physical experimentation. a flow and sediment transport model <br /> <br />that simulates bed evolution may be used to model bed and bar response to flood passage. The model used by Andrews <br /> <br />and Nelson (1989) is an example of such a flow and sediment transport model. and it is cited as an appropriate tool in <br /> <br />the Upper Colorado basin (Stanford. 1994) to model changes in channel topography in response to varied flow, <br /> <br />Geomorphology and Habitat Interactions <br /> <br />Instream Flow Philosophies <br /> <br />Historically, instream flow recommendations have been based on the flows necessary for maintaining a suitable <br />
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