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Last modified
7/14/2009 5:02:34 PM
Creation date
5/20/2009 10:39:03 AM
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UCREFRP
UCREFRP Catalog Number
8245
Author
Schmidt, J. C., K. L. Orchard and S. P. Holman.
Title
Spatial and Temporal Patterns of Habitat Availability in Desolation and Gray Canyons.
USFW Year
1996.
USFW - Doc Type
Logan, Utah.
Copyright Material
NO
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(Appendix B). Each set of matched photographs is accompanied by an analysis of the <br />changes in the vegetation and geomorphology visible in the image. Changes in riparian <br />vegetation, evidence of the narrowing of the active channel, the number of geomorphic <br />surfaces adjacent to the channel, and changes in substrate composition of bars and islands <br />were analyzed and summarized for each image. <br />RESULTS <br />Characteristics of the Channel <br />The majority of repeated surveys of channel cross sections show little or no <br />seasonal fluctuations in bed geometry (Fig. 2 and 3). In 11 of the 24 cross sections, bed <br />material was sand. The bed in the remaining 13 cross sections was primarily composed of <br />cobbles or gravel. Five of the cross sections spanned recirculating flow. Channel cross <br />sections containing the coarsest material were correlated with the narrowest channel widths <br />and were the most stable. Cobble-bedded cross sections in zones of downstream flow <br />often showed no seasonal change with the exception of minor aggradation in the thalweg at <br />high discharge. Sand-bedded cross sections showed the most variability with discharge. <br />Uneven bathymetric traces at high discharge indicated the occurrence of dunes which did <br />not exist at base flow. Typical depths of cross sections with uniform downstream flow <br />ranged from 2 to 5 meters at bankfull discharge. The greatest channel depths occurred <br />adjacent to zones of recirculation where depths in the thalwegs were observed as deep as 1? <br />meters at bankfull discharge. <br />Characteristics of the Banks and Shallow Bars -- Surficial Mapping <br />The banks of the Green River in the study reaches are composed of fine-grained <br />alluvium, gravel and cobbles, fine- to coarse-grained debris derived from tributaries, scree <br />that occurs as talus on the lower part of hillslopes, and bedrock. Rapids typically occur <br />where tributary-derived debris partially blocks the channel. Downstream from these <br />rapids, recirculating eddies typically occur and fine-grained alluvium, in the form of sand <br />bars, occur in these areas. Gravel bars are often located downstream from these eddies.
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