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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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eddies downstream from rapids. Gravel was most common just downstream from debris <br />flow deposits. Gravel ranges in size from small pebbles to boulders, but is most typically <br />cobble size. Debris flow deposits consist of unsorted angular clasts and fines. Talus <br />deposits are unconsolidated angular colluvium, deposited by rockslides. There is generally <br />more interstitial space between particles in a talus slope than in debris fans and the angle of <br />repose is steeper. <br />At base flow discharges, shoreline habitat for the entire reach is predominately <br />unvegetated sand, with vegetation comprising the smallest percentage of the total shoreline <br />and gravel, talus, and debris flow material sharing equal portions. As discharge increases <br />and water elevation rises, the amount of vegetated shoreline in contact with the water's <br />edge increases greatly (Figure 5). Near bankfull discharge, 62 percent of the total shorelin <br />length in the reach is comprised of inundated vegetation (Table 1). Considering only <br />shorelines within low velocity or recirculating zones, sand is even more prevalent at each <br />discharge, with vegetation increasing almost linearly (Figure 6) (Table 2). <br />Total length of shorelines was shown to increase with decreasing discharge. As <br />water recedes from bankfull stage, the shoreline becomes more contorted and total linear <br />length increases. The discharge that maximizes shorelines within low velocity zones, <br />however was not the lowest observed discharge. Shoreline length within low velocity <br />zones initially increases as discharge increases from base flow, but then decreases as the <br />river continues to rise (Figure 7). <br />Historical Change of Habitats Based on Matched Photography <br />In virtually all of the photographic matches that were made there was a pronounce( <br />increase in vegetation along the banks, primarily tamarisk and willow (Photos 1 and 2). <br />Islands and bars that show historical evidence of being scoured are now fully stabilized bS <br />vegetation. Secondary channels have aggraded and filled over time, thus narrowing the <br />river corridor. Islands and bars also show a marked increase in size and changes in shape
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