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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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with fence posts or rebar that also serve as local elevation control points. Measurements <br />were made by fixing a steel or kevlar tag line between the endpoints and measuring depth at <br />3.05-m intervals. The echo-sounding transducer was mounted on a pole attached to a raft; <br />boat position was held under the tagline by the boat operator using oars or an outboard <br />motor. The echo sounder was operated by a second person on the boat who labeled tag- <br />line marks on the paper trace. Accuracy was evaluated by repeating measurements with the <br />total station for those points where water depth was less than 1.5 m. The standard <br />deviation of the 4 passes was calculated and was typically less than the thickness of the line <br />used to plot the bed profile. Large errors in measured depth occurred only where depth <br />changed rapidly or where bed material was primarily large rocks and boulders. Water- <br />surface elevations were surveyed at the time of each cross-section measurement and again <br />during a mapping trip in July 1996. Characteristics such as bed and bank material, high- <br />water marks, and locations of distinct geomorphic surfaces were noted and surveyed at <br />each site. The precise location of each cross section was recorded on aerial photographs <br />(1:5000 scale) and topographic maps. The coordinate survey data were reduced into <br />distances and elevations relative to the reference pins. The discharge at the time of <br />measurement was determined from records for the U.S. Geological Survey stream gaging <br />station at Green River, Utah (station number 09315000). <br />Cross sections were established on or as near as feasible to river mile markers as <br />located by Belknap (1994), so as to create a systematic sample of channel types and bed <br />materials. Waves in rapids cause many difficulties in measuring the bed, and cross <br />sections were generally not surveyed in rapids. Cross sections were established in small <br />riffles, zones of strong downstream flow, pools and recirculating eddies. <br />Mapping <br />Surficial geology of the river corridor was mapped in each of the four study reaches <br />to establish the distribution of geomorphic features and determine the composition of bank
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